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Revision History y Version Date Description i ti Edit Editors V0.1 2017/09/15 First release Tina Tang, YH Ku, Wanda Tseng, Sean Hwang, PS Chen, FK Pan, Charles Chen V0.2 2017/09/29 Modify LP3 layout guideline Tina Tang, Sean Hwang CONFIDENTIAL B...
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Package Outline of MT6771 CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6771 Footprint Recommendation Note: • Use copper defined for all solder pads (see Figure 1). copper defined for all solder pads (see Figure 1) • Recommended stencil opening 0.24mm square with 0.075R angle (see green area in Figure 2) • Use 0.1/0.22mm (drill/land) laser via on PAD to improve the yield of SMT. As in Figure 1, use copper defined for all pins. Figure 2 P d i Pad size: 0.24mm; solder mask: 0.315mm 0 24 k 0 315 0.24mm Figure 1 R0.075 CONFIDENTIAL B...
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MT6771 Ball Out Design eMMC DRAM I/F DRAM I/F MT6631 I/F USB2.0 DVDD_EMI DVDD_EMI USB3.0 PMIC I/F DVDD_CORE DVDD_CORE MIPI CSI MIPI DSI DVDD_ DVDD_ PROCE_L PROCE_L DPI IF EINT/KP/ DVDD_ DVDD_ DVDD_MODEM DVDD_MODEM GPIO/CAM PROCE_B PROCE_B MSDC1 RF BPI RF BSI MISC BSI RF IQ CONFIDENTIAL B...
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PCB Stack‐up Recommendation ▪ To keep the best power integrity, the total thickness of PCB should be < 0.7mm. ▪ Follow the relative stack‐up arrangement listed on the following pages for LPDDR4 and power distribution network. ▪ Others signals can be routed in the rest of the area. ▪ Two types of stack‐up are recommended here. For other combinations extend from it combinations, extend from it. • 8 Layer HDI2 • 10 Layer HDI2 CONFIDENTIAL B...
Placement Notes BT/FM/ Main WiFi/GPS Camera Camera MT6631 LB/MB DRX ANT WIFI/BT/ Audio GPS ANT Jack RF IC (MT6177) 6771 LPDDR4X HB DRX ANT DRX ANT SD card BATT BATT PMIC PMIC Conn (MT6358) Debug Conn Conn TOP Bottom Conn SIM side side card Audio SIM ...
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PCB Module Design g ▪ We recommend you adopt modules by MediaTek as the first priority. As the design trend turns to developing light, thin and higher battery capacity on smart phones, the complexity on system design becomes a great challenge nowadays. It is a time and cost consuming process to meet the layout constraints and at the same time deliver a good signal and power integrity. To help our customers to rapidly design a correct, performance‐oriented and reliable layout on PCB we have introduced the layout on PCB, we have introduced the MMD (MediaTek (MediaTek Module Module Design) solution. MMD Design) solution MMD provides optimized CPU and MCP layout design with guaranteed performance and stability. Meanwhile, it greatly shortens the time to market. The main purpose of MMD is providing a convenient and flexible solution. The ideal condition is to implant the modules without any modification. However, if the module cannot match your mechanics, you can still partially adopt MMD and enjoy the benefits from it. Contact your corresponding FAE when you have any problem in introducing MMD. CONFIDENTIAL B...
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Enabling your High‐speed Digital Design~ Enabling your High‐speed Digital Design~ SIE SIE (Signal Integrity Express): (Signal Integrity Express): SI/PI simulation support SI/PI simulation support CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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LPDDR4X ‐ Placement ▪ Please keep the spacing between MT6771 and DRAM as small as possible. ▪ Recommend the spacing is less than 0.6mm. MT6771 DRAM CONFIDENTIAL B...
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LPDDR4X ‐ Guideline Grouping Signal Name Description EMI[0:1]_DQ[0:15] Data bus EMI[0:1]_DMI[0:1] Data mask EMI[0:1]_CA[0:5] Command/Address EMI[0:1]_CKE[0:1], EMI[0:1]_CS[0:1], Clock enable, Chip EMI_RESET_N select, Reset EMI[0:1] DQS[0:1] T, EMI[0:1]_DQS[0:1]_T, Data strobe EMI[0:1]_DQS[0:1]_C EMI[0:1]_CK_T, EMI[0:1]_CK_C Clock Please remove test point if not necessary Place ground via when layer transition happens It is not necessary to match routing length but keep trace length as short as possible. For LPDDR4X 3733, recommend thickness of Prepreg1‐2 and Prepreg2‐3 are less than 50um. Shielding traces on L1 must connect to ground plane on L2 and/or ground balls on L1 at both SoC side and DRAM id DRAM side. Width(um) Edge‐to‐edge Spacing(um) Routing Ground Group Reference Shielding Intra Skew(um) Layer...
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LPDDR3 ‐ Placement ▪ Please keep the spacing between MT6771 and DRAM as small as possible. ▪ Recommend the spacing is less than 0.6mm. DRAM MT6771 CONFIDENTIAL B...
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LPDDR3 ‐ Guideline Grouping Signal Name Description EMI0_DQ[0:31] Data bus EMI0_DMI[0:3] Data mask EMI0_CA[0:9] Command/Address Clock enable, Chip EMI0_CKE[0:1], EMI0_CS[0:1], select, Reset EMI0_DQS[0:3]_T, EMI0_DQS[0:3]_C ]_ , Data strobe EMI0_CK_T, EMI0_CK_C Clock VREF_EMI Reference voltage 1. Please remove test point if not necessary Please remove test point if not necessary 2. Place ground via when layer transition happens 3. It is not necessary to match routing length but keep trace length as short as possible. 4. Shielding traces on L1 must connect to ground plane on L2 at both SoC side and DRAM side. Width(um) Edge‐to‐edge Spacing(um) Routing...
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Basic Concepts of Power Delivery Network ▪ ▪ With the increasing demand of switching current and power With the increasing demand of switching current and power consumption, the conventional PCB design concept is no longer sufficient in dealing with high‐performance smart phone. Thus, a well‐ designed PDN (Power Delivery Network) on PCB is greatly significant for d PDN (P D li PCB i i ifi system stability and performance. ▪ The whole PDN should include all the interconnections and current return paths from PMIC to AP. The performance mainly depends on the location and number of power traces, PWR/GND vias, and decoupling capacitors. These parameters are defined in the following guidelines. capacitors. These parameters are defined in the following guidelines.
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Guidelines for Remote Sensing g R_Remote Buck 0Ω network resistor converter converter PWR_FB/GND_FB Feedback network (remote sensing) To compensate voltage loss, each two feedback paths (PWR_FB and GND_FB) are connected from every critical power domain which is close to MT6771 to the buck converter (PMIC). 1. The voltage detection networks are sensitive to noise coupling. Use ground shielding for the entire trace including vias. 2. To keep the accuracy of feedback voltage, do not move the connection away from the bottom of AP and follow the resistance(R Remote) spec. the bottom of AP and follow the resistance(R_Remote) spec. CONFIDENTIAL B...
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Guidelines for Power Domain Bottom Cap 0201 0402 3 t 0201 , 0402 3‐terminal decoupling caps group cap VPROC1, VPROC2 , PMIC VGPU, VCORE , VMODEM, 0402 , 0603 decoupling caps Network VSRAM_PROC1, VSRAM_PROC2, VSRAM GPU VSRAM CORE VSRAM_GPU, VSRAM_CORE, VEMI_VDD2 , VEMI_VDDQ critical path The whole PDN is from PMIC output pin, through (the LC low‐pass filter) & decoupling caps to AP. PDN is the source of all switching currents. “Critical‐Path” is defined as the power trace segment from the 1 group cap to AP. The critical path design should follow the given PCB layout guidelines. 2‐sided SMT: In the ”bottom cap” region, place 0201 and 0402 SMD capacitors right underneath the power balls. In ”1 group cap” region, place the rest of decoupling caps. is defined as the critical path from ”1 is defined as the critical path from ...
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Mounting Inductance Double‐sided SMT example (recommended) The bigger/longer the loop, the higher the inductance ( t ti (starting from PWR pad back to GND pad). *Additional routing connection between laser and PTH vias Best: Lowest mounting inductance Moderate Single‐sided SMT example Bad PWR/GND plane coupling and largest current loop *PWR/GND route at adjacent and upper layers *GND at upper layer while PWR at lower layer CONFIDENTIAL B Acceptable once S short enough Worst: Highest mounting inductance loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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Via Interconnection Minimize the distance Good: Lowest mounting inductance Bad: Excessive routing to increase inductance Decoupling cap Laser via PTH via Design suggestions for via interconnection Via interconnect is critical in delivering current between each layer and is usually the bottleneck in the entire PDN networking. Thus, we strongly recommend you follow the related PWR/GND layout guidelines. Connect PWR/GND via to the “wide power trace” and place it as close to the decoupling capacitor as possible. Each decoupling capacitor should have at last one pair PWR/GND via. If the routing space is available, more PWR/GND vias are recommended. Try distributing PTH and Laser vias uniformly and increase PTH via as much as you can. CONFIDENTIAL B...
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MT6177 Placement (1/3) RF supports PRX (Primary RX) and DRX (Diversity RX). MT6177 has two receiver circuits. DRX matching components should be placed near MT6177. MT6177 DRX IC ball number IC ball name PCB net name DRX1 RF_B12B17_DRX_RFIC MT6177 DRX2 RF_B8_DRX_RFIC DRX3 RF_B20_DRX_RFIC DRX4 RF_B5B26B27_DRX_RFIC DRX5 RF_B28_DRX_RFIC DRX6 RF_B39_DRX_RFIC DRX7 RF_B3_DRX_RFIC DRX8 RF_B2_DRX_RFIC DRX9 RF_B32_DRX_RFIC DRX10 RF_B1B4_DRX_RFIC DRX11 RF_B40_DRX_RFIC DRX12 RF B38B41 DRX RFIC DRX13 RF_B7_DRX_RFIC DRX14 RF_B42_DRX_RFIC DRX matching ...
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MT6177 Placement (2/3) PRX matching components should be placed near MT6177. PRX matching MT6177 PRX close to MT6177 IC ball number IC ball name PCB net name PRX1 PRX1 RF B12B17 PRX RFIC RF_B12B17_PRX_RFIC PRX2 RF_B8_PRX_RFIC PRX3 RF_B20_PRX_RFIC PRX4 RF_B5B26B27_PRX_RFIC PRX5 PRX5 RF B28 PRX RFIC RF_B28_PRX_RFIC PRX6 RF_B34B39_PRX_RFIC PRX7 RF_B3_PRX_RFIC PRX8 RF_B2_PRX_RFIC PRX9 RF_B32_PRX_RFIC PRX10 RF_B1B4_PRX_RFIC PRX11 RF_B40_PRX_RFIC MT6177...
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MT6177 Placement (3/3) MT6177 and PA IC should have their own shielding case to prevent de‐sense issues. Top side Top side Bottom side Bottom side Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case MT6177 Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case Shielding Case hi ldi hi ldi CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6177 TX/RX Signals Impedance control is necessary for all RF signals. Impedance 50Ω Make sure that the routing impedance is single‐ended 50Ω for TX/PDET/RX. MT6177 Impedance 50Ω CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6177 IQ Signals (1/3) a. All GND ball adjacent RXIQ must be well connected @ L1. (Fig‐1) b. The RXIQ signal must have GND via close to its layer transition. (Fig‐1) c All RXIQ signals should have GND shielding by group (adjacent up/down layers) (Fig 2) c. All RXIQ signals should have GND shielding by group (adjacent up/down layers). (Fig‐2) d. All TXIQ, RXIQ, DETIQ layout length must < 20mm to prevent bad isolation. IC ball name IC ball name IC ball number IC ball number DET_IN0 DET_IP0 DET_QN0 DET_QP0 DRX_BB_I0 DRX_BB_I1 DRX_BB_Q0 DRX_BB_Q1 PRX BB I0 PRX_BB_I0...
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MT6177 IQ Signals (2/3) Layout not recommended Layout recommended Figure 1 shows the ABB IQ are routed Figure 2 shows the ABB IQ are routed away beneath the PMIC power nets even with from PMIC power nets to avoid de‐sense issue. ground plane shielding. hi ldi No overlap between PMIC nets and ABB IQ But the magnetic coupling from PMIC region. switching node could cause de‐sense issue. N t R Not Recommended Recommended RFIC (MT6177) PMIC PMIC PMIC PMIC (MT6771) Figure 1 Figure 2 MT6177 ABB IQ MT6177 ABB IQ CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6177 IQ Signals (3/3) Layout not recommended Layout recommended Figure 1 shows the PMIC power nets via are Figure 2 shows PMIC power nets via are routed in the ABB IQ region in the PCB inner away from ABB IQ region at least 25mil to layer even with ground shielding avoid de‐sense issue. But the low frequency PMIC switching noise could couple to RX IQ and cause de‐sense issue issue. Recommended Not Recommended ABB IQ Figure 2 Figure 2 >25mil 25 il ABB IQ ABB IQ PMIC power nets Figure 1 PMIC PMIC power nets CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6177 Duplexer ▪ Duplexer notice a. Enlarge L1 copper pouring range for duplexer GND pins (2, 4, 5, 7, 8). b. Avoid parallel routing between ANT/RX/TX signals. Avoid parallel routing between ANT/RX/TX signals L2 GND plane c. Maintain good isolation between ANT/RX/TX by: (blue) 1. GND shielding between these three paths. 2. Good grounding with plenty of GND via. d. There should be good GND plane at L2 for reference. TX TX CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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Others for MT6177 a. CLK signal should have GND shielding and avoid routing this net between BSI signals. (Fig‐1) b. BSI signals should have GND shielding by group (adjacent up/down layers). (Fig‐1) c. Must have ground via close to the RXIQ when layer change happens. (Fig‐2) c. Must have ground via close to the RXIQ when layer change happens. (Fig 2) d. RFFE MIPI signal (MIPI0_SCLK , MIPI0_SDATA) should be as far as possible from RF signals. (Fig‐3) MT6177 BSI BSI Group IC ball name IC ball name IC ball number IC ball number BSI_0_CK BSI_0_D0 BSI_0_D1 BSI_0_EN RX IQ RX IQ (Fig‐3)
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MT6358 Power Input (1/2) IC Ball Name IMAX(mA) VSYS Input VSYS Input VSYS SMPS VSYS_SMPS VSYS_VPROC11 3600 VSYS 22uF capacitor is placed near MT6358 VSYS input balls (Fig. 2). VSYS_VPROC12 2700 VSYS_VCORE 3600 Routing from 22uF VSYS capacitor uses start topology to connect to VSYS_VMODEM 1500 VSYS_VS1 2000 each device each device. Fig 4 Fig. 4 VSYS_VS2 1500 VSYS_VPA 1750 1. VSYS input for BUCK. (Fig. 3) VSYS_GPU 2000 VSYS_VDRAM1 1500...
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MT6358 Power Input (2/2) Layout method of MT6358 power Input for Buck GND Buck GND balls are connected to buck capacitors close to pin with plane or trace (Trace Width > 8mil * N (ball number) + M (ball pitch)). (Fig.1~2) Buck GND balls should be connected to buck capacitors first and isolated from the nearby GND trace and plane then connected to main GND at L3 (Fig.1~2). Fig.1 Fig.2 MT6358 L1&L2 L1&L2 Layer 2: BUCK GND is isolated from nearby GND trace and plane. CONFIDENTIAL B...
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MT6358 Buck Output (1/2) The buck inductors should be placed near MT6358. (Fig.1) The output current is shown in Fig.2. Fi 1 Fig.1 Fig.2 Top side Top side Top side Top side MT6358 CONFIDENTIAL B...
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MT6358 Buck Output (2/2) Those signals are differential pairs and should be shielded by GND and far away from noise signals (Fig.1 ~ Fig.2). VMODEM_FB/GND_VMODEM_FB Fig. 1 Fig. 1 VPROC11 FB/GND VPROC11 FB VPROC11_FB/GND_VPROC11_FB VPROC12_FB/GND_VPROC12_FB VCORE_FB/GND_VCORE_FB VGPU_FB/GND_VGPU_FB VDRAM1 FB/GND VDRAM1 FB VDRAM1_FB/GND_VDRAM1_FB VS1_FB, VS2_FB, VPA_FB Fig. 2 CONFIDENTIAL B...
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MT6358 LDO Output (1/2) See table. for the suggested LDO output layout. 1. Trace w idth≧ 6m il 2. V alue and placem ent of Capacitor please refer design notice VRF18/VRF12/VRF12 S: Trace Trace Rpcb PCB drop Ball nam e Im ax • Traces should be in inner layer or Length W idth H =50um , 1/3 oz voltage VFE28 50m A 2500m il 6m il 670m Ω 34m V under shielding case.
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MT6358 LDO Output (2/2) VREF capacitor should be placed near M12/N13 pin. DVDD18_DIG capacitor should be placed near J8 pin. Close to MT6358 DIG power capacitor close to MT6358 VREF capacitor close to MT6358 MT6358 CONFIDENTIAL B...
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Table 1 MT6358 Audio (1/3) Ball PCB net name IC ball name number The signals in Table 1 should be routed as differential pairs and shielded The signals in Table 1 should be routed as differential pairs and shielded AU_VIN0_P AU_VIN0_P by GND (adjacent and up/down layers) and trace width ≧ 4mil. AU_VIN0_N AU_VIN0_N (HSP/HSN trace width ≧ 6mil) AU_VIN1_P AU_VIN1_P AU_HPR/AU_HPL signals should be shielded by GND respectively and trace width ≧ 6mil trace width ≧ 6mil. AU VIN1 N AU_VIN1_N AU VIN1 N AU_VIN1_N...
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MT6358 Audio (2/3) Power Audio Negative Charge Pump (AUDNCP) related pins: AVDD18_AUD/AVSS18_AUD/AN_V18N/ FLYP/FLYN All traces are wide and short. To minimize ESR and ESL, all traces are on TOP layer without any PCB via. Avoid using PCB VIA between the 5 traces (from ball to cap). (Fig.1 ~ Fig.2) AVSS18 AUD h ld b AVSS18_AUD should be connected to main GND with very short trace. (Fig.1 ~ Fig.2) t d t i GND ith h t t (Fi 1 ~ Fi 2) AVDD28_AUD and AVSS28_AUD domain, the decoupling cap should also be as close to chip as possible. AVSS28_AUD is connected to main GND with a single VIA. (Fig.3) Fig.2 Fig.1 Fig.3 CONFIDENTIAL B...
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MT6358 Audio (3/3) A di /CLK IF S h Audio/CLK IF Schematic and Layout Notice t N ti The trace length of AUD CLK MOSI/AUD DAT MOSI0/AUD DAT MOSI1/AUD SYNC MOSI should be the same as much as possible. The trace length of AUD_CLK_MISO/AUD_DAT_MISO0/AUD_DAT_MISO1/AUD_SYNC_MISO should be the same as much as possible. AUD_CLK_MOSI/AUD_CLK_MISO should have GND shielded and the spacing should be >= 3mil. Audio IF should be kept away from LX signal (e.g VCORE) and CLK. (Fig. 1) Fig.1 CONFIDENTIAL B...
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MT6358 AUXADC Recommended AUXADC layout AVDD18_AUXADC/AUXADC_VIN should be routed as differential pairs with good GND shielding. Route AVSS18_AUXADC with 15 mil trace width under AVDD18_AUXADC/AUXADC_VIN trace to provide return current path. AUXADC capacitor should be placed near AVDD18_AUXADC/AUXADC_VIN pin. Ball number IC ball name PCB net name AVDD18_AUXADC AVDD18_AUXADC AVSS18_AUXADC AVSS18_AUXADC AUXADC VIN AUXADC_VIN AUXADC VIN AUXADC_VIN AUXADC_VIN C322 AVDD18_AUXADC CONFIDENTIAL B...
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MT6358 DCXO (1/2) XTAL1 and XTAL2 connections to TMS pin1 and pin3 can be swapped. Keep out Buck, NCP, Class‐D or other toggling signals 9mm away. (Fig.1) Short DCXO gnds to main GND directly by the GND vias. (Fig.2) AVSS22_XO_ISO AVSS22_XO AVSS22_XOBUF Fig.1 PMIC Fig 2 Fig.2 AVSS_AUXADC ADC_IN AVSS22_XO XTAL2 XTAL1 > 9mm CONFIDENTIAL B...
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MT6358 DCXO (2/2) ▪ XTAL1/2 shielding case 1 • Routing XTAL1/2 on 1 layer, and with well‐grounding in 1 and 2 layers. • Any other signals crossing or parallel XTAL1/2 are not allowed. ▪ XTAL1/2 shielding case 2 • Well shielding XTAL1/2 (2 layer) with GND • Any other signals crossing or parallel XTAL1/2 are not allowed. ▪ Separate ground shielding for each buffer output, XO_SOC, XO_WCN, XO_NFC, XO_CEL, XO_EXT • Signal Buffer out Case 1 Case 2 • XTAL1/2 signal • (EVB layout) (EVB layout) • • • • • CONFIDENTIAL B...
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Others for MT6358 Gauge‐ CS N/CS P (ball: M5/N6) should be routed as differential pairs and far away CS_N/CS_P (ball: M5/N6) should be routed as differential pairs and far away from noise signals. MT6358 DCXO_32K CS_N CS_P CONFIDENTIAL B...
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Package Outline of MT6631 CONFIDENTIAL B...
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MT6631 Pin Definition WiFi/BT 3V3 WiFi/BT 3V3 GPS RF GPS RF Pin 36: FM 2V8 GPS 1V8 & Pin 37: FM RF_N WiFi /BT RF pin 6631 Top Pin 38: FM_RF_P logic power Host reset WiFi ePA Feedback voltage detect Top digital control WiFi/BT 1V8 41 DVSS 41 DVSS Package type: QFN 40‐lead Package size: 5 x 5mm WiFi/BT System clock input...
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MT6631 v.s. MT6771 Placement ▪ Keep the distance between MT6631 and MT6771 between 0.7cm~5cm. If < 0.7cm: It may cause connectivity RF de‐sense. If > 5cm: IQ signals will be distorted (like EVM fail Critical) If > 5cm: IQ signals will be distorted (like EVM fail, Critical). MT6631 MT6771 CONFIDENTIAL B...
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MT6631 IQ Trace IQ signals are differential pairs. Every pair should be shielded by GND (adjacent and up/down layers). If the layout area is not enough, shield by groups, for example: WiFi group: WF_IP/IN/QP/QN Pin 17 ~ Pin 20 BT group: BT_IP/IN/QP/QN Pin 13 ~ Pin 16 GPS group: GPS_IP/IN/QP/QN Pin 9 ~ Pin 12 IQ trace width/spacing: 75/75um differential pair. PCB trace should be as balanced as possible, and keep differential signals balanced Smallest differential loop area keep differential signals balanced. Smallest differential loop area. Spacing 75um~6mil above with GND. 75um 75um 75um 75um more 75um 75um 75um 75um more than 75um 75um 75um 75um 75um above above CONFIDENTIAL B...
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MT6631 Control Trace High‐speed Connectivity WF 3‐wire control line • Routed together and shielded by GND for left and right. • Do not couple with Power Line and IQ trace, and route in inner layer away from WiFi/GPS RF trace. Group Pin no. PCB net‐name WF_CTRL0 WF CTRL WF CTRL1 WF_CTRL2 Other control signals • Routed in inner layer; do not couple with Power Line and IQ trace. Group Pin no. PCB net‐name CONN_HRST_B CONN_TOP_DATA Other CONN_TOP_CLK control WB_PTA signals BT CLK BT_CLK BT_DATA CONFIDENTIAL B...
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MT6631 26MHz CLK ▪ ▪ Connectivity 26MHz (pin8: XO IN) should be shielded by GND and routed far away from noise signals Connectivity 26MHz (pin8: XO_IN) should be shielded by GND and routed far away from noise signals. ▪ 26MHz trace length should be less than 10cm. ▪ When adding VIA to change layer, keep VIA in every layer well grounded. ▪ Keep out the metal on L2 and make GND plane on L3 under all crystal circuits. L2 keep out and L3 L2 keep out and L3 Keep Keep 26MHz trace 26MHz trace GND plane GND plane well well‐ ‐ grounded grounded Keep ...
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MT6631 RF Trace: WiFi/BT/GPS WB RF 2G ( i 31) WB RF 5G ( i 34) WB_RF_2G (pin 31), WB_RF_5G (pin 34) and GPS_RFIN (pin 39) are RF antenna pin for WiFi/BT/GPS. Keep 50Ω d GPS RFIN ( i 39) WiFi/BT/GPS K 50Ω impedance with good shielding by GND. (Fig.1) Route on L1 and avoid layer transition for RF trace route (affect impedance control and PCB trace loss). (Fig.1) MT6631 must be placed close to Wi‐Fi antenna (make RF trace short, Wi‐Fi 5GHz PCB trace loss is huge). (Fig.1~2) GPS external LNA components must be close to antenna and route on Layer 1. (Fig.1~2) Fig.2 GPS external LNA components close to antenna close to antenna Fig.1 MT6631 Close to antenna VIA to antenna VIA to antenna must well VIA to antenna ...
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MT6631 RF Trace: FM FM_LANT_N (pin 37) and FM_LANT_P (pin 38) are FM signals and required for differential pairs to get better noise immunity. FM signals must be shielded by GND (left/right /upper/lower) with stitching GND via. If RF t If RF trace cannot be well protected, it will produce noise to FM easily. t t d it ill t FM ESD interference can be avoided if FM trace is in the inner layer and has good GND shielding. 4~8mil above 4~8mil above CONFIDENTIAL B...
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MT6631 Power Trace (1/2) AVDD33 WBT Pl AVDD33_WBT: Place decupling capacitors close to power pin 33. (Fig.1, 3) i 33 (Fi 1 3) AVDD28_FM: Place decupling capacitors close to power pin 36. (Fig.1~2) Keep away from other noisy power traces and high speed digital traces. AVDD28 FM decupling AVDD28_FM decupling Fig.1 capacitor close to pin 36 Fig.2 AVDD33_WBT decupling capacitors close to pin 33 MT6631 MT6631 MT6631 Fi 3 Fig.3 CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6631 Power Trace (2/2) AVDD18 WBT: Place decupling capacitors close to power pin 26 27 (Fig 1~2) AVDD18_WBT: Place decupling capacitors close to power pin 26,27. (Fig.1~2) AVDD18_GPS: Place decupling capacitors close to power pin 40. (Fig.1、3) Power traces VCN18_PMU should be used star routing topology to connect AVDD18_WBT (pin 26,27) and AVDD18_GPS (pin 40). (Fig.1) Keep away from other noisy power trace and high speed digital trace. AVDD18_GPS decupling Fig.1 Fig.2 capacitor close to pin 40 MT6631 AVDD18_WBT decupling Fig.3 capacitors close to pin 26,27 CONFIDENTIAL B loginid=molbasic01@ginreen.com,time=2018-03-10 16:15:38,ip=113.87.91.205,doctitle=MT6771 PCB Design Guidelines_V0_2.pdf,company=Ginreen_WCX...
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MT6370 Schematic/Layout Notice ▪ High current path must enlarge trace width as 25mil/1A. • CHG_VIN, CHG_VLX, VSYS and VBAT4A • CHG_VMID, FL_VMID2.5A • FLED1/21 5A • FLED1/21.5A ▪ Bypass CAP/Resistor near to related ball. • VDDM, VDDA, BL_VDDA, DB_VDDA, CHG_BOOT to CHG_VLX, and CHG_ILIM. ▪ Inductor close to LX pins and not couple to another sensitive trace.(ex: SDA/SCL) SDA/SCL) ▪ VDDM and VDDA, BL_VDDA and DB_VDDA cap’s GND should be directly connected to GND plane. CONFIDENTIAL B...
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MT6370 ‐ Charger CHG_VIN Trace ▪ High current path CHG_VIN, CHG_VLX, VSYS and VBAT4A L1 CHG VIN L1:CHG_VIN trace must be > 2.5mm L2: Via numbers should be >8ea for L2: Via numbers should be >8ea for L4: CHG_VIN trace must be > 2.5mm current path. CONFIDENTIAL B...
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MT6370 ‐ Charger CHG_VMID & CHG_VLX CHG_VMID Output Cap CHG_VMID(=FL_VMID) trace must be > 1.5mm place as close to IC(<2mm) for parallel charger application CHG VLX CHG_VLX Inductor Inductor place as close as possible to IC(<2mm) CONFIDENTIAL B...
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MT6370 – VSYS & VBAT L1 L1 VSYS trace VSYS trace VSYS‐Via should be VSYS trace must be > 2.5mm must be > 2.5mm >8ea for current path. must be > 2.5mm VBAT‐Via should be VBAT trace VBAT trace >8ea for current path. must be > 2.5mm must be > 2.5mm CONFIDENTIAL B...
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MT6370 – FLED/ Display / VDDM Inductor Inductor Output Output Output Output FLED1/FLED2(Pin:A6,A7) Display Bias ( Pin:K7) VDDM/ VDA trace must be > 750um Inductor and Output Cap Output Cap Close to IC <2mm Close to IC <2mm These output caps’ GND should be These output caps GND should be isolated from the nearby GND trace and plane then connected to main GND directly. VBATS VBATS (Pin:D5) sense trace must connect to VBAT ‐ battery pack side. CONFIDENTIAL B...
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eMMC 5.x BreakOut Region Topology: Main routing on L1/L3, L2/L4 solid reference gnd: Breakout length ≦ 3810 um (as short as possible) Keep L2 as solid reference gnd as possible. Place the gnd stitching via between BGA ball and L2 gnd on both AP/eMMC Place the gnd stitching via between BGA ball and L2 gnd on both AP/eMMC. Trace Width (w) = Minimum Trace Width Trace Spacing ≧ W um Main Route Region Topology: Main routing on L1/L3, L2/L4 solid reference gnd: Trace length <=50800 um Trace Width (w) = W um Trace Spacing: DATA to DATA ≧ 2Wum DATA to DATA ≧ 2Wum CLK to DATA/CMD/DSL/RST ≧ 2W um DSL to DATA/CMD/CLK/RST ≧...
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Differential pairs are well‐shielded by GND (adjacent and up/down layers). Differential Differential P/N ske P/N skew Total length Total length N mber of ias allo ed Number of vias allowed impedance UFS_TX0P/N, 100ohm < 5mil < 6 inch UFS RX0P/N UFS_RX0P/N Outer layer Inner layer CONFIDENTIAL B...
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USB 2.0/USB 3.0 Differential pairs are well‐shielded by GND and GND vias (adjacent and up/down layers). Routing differential pair straight and symmetrically on the same layer. S 2 0 USB2.0: Maximum of 2 via‐hole/layer change. USB3.0: no via preferred f 2 i h l /l S 3 0 Differential impedance P/N skew* Total length USB DP/DM USB_DP/DM 90ohm 90ohm < 1 5mm < 1.5mm < 8inch < 8inch SSUSB_TXP/TXN, 90ohm < 125um < 5inch SSUSB_RXP/RXN ...
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MIPI ‐ DPHY ▪ MIPI signals’ differential impedance: 100Ω ▪ Total length < 6 inch (PCB + FPC + Module) Lane‐to‐clock matching ≤ 2.5mm P/N skew ≤ 625um ▪ Well shielded by GND (adjacent and up/down layers ) is recommended; otherwise keep the spacing ≧ 3x min (h1, h2) rule. (Fig. 1&2) & ) ▪ Ground isolation (adjacent and up/down layers ) from other signals Fig.1 ≧ 3x min(h1,h2) Fig.2 CONFIDENTIAL B...
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MIPI ‐ CPHY ▪ MIPI signals’ single‐end impedance: 50Ω ▪ Total length < 4 inch (PCB + FPC + Module) Skew in the same trio: 625um Trio‐to‐trio skew: 22.5mm ▪ Well shielded by GND (adjacent and up/down layers ) is recommended; otherwise keep the spacing ≧ 3x min (h1, h2) rule. (Fig. 1&2) ▪ Ground isolation (adjacent and up/down layers ) from other signals Fig.1 ≧ 3x min(h1,h2) ≧ ( , ) ≧ 3x min(h1,h2) ≧ ( , ) Fig.2 CONFIDENTIAL B...
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SIM Card ▪ SIM1_SCLK/ SIM2_SCLK should be shielded by GND. CONFIDENTIAL B...
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T‐CARD BreakOut Region Topology: BreakOut Region Topology: Main routing on L1/L3, L2/L4 solid reference gnd: Breakout length ≦ 5080 um (as short as possible) Keep L2 as solid reference gnd as possible. Place the gnd stitching via between BGA ball and L2 gnd on both AP/eMMC Place the gnd stitching via between BGA ball and L2 gnd on both AP/eMMC. Trace Width (w) = Minimum Trace Width D. Trace Spacing ≧ W um Main Route Region Topology: Main Route Region Topology: Main routing on L1/L3, L2/L4 solid reference gnd: Trace length <= 101600 um Trace Width (w) = W um Trace Spacing: Trace Spacing: DATA to DATA ≧...
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