Output Power Supply Interface; Signal Control Interface; Overview - Huawei MU709 Series Hardware Manual

HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
module. In addition, to reduce the impact of channel impedance on voltage drop, you
are recommended to try to shorten the power supply circuit of the VBAT interface.
It is recommended that customers add the EMI ferrite bead (FBMJ1608HS280NT
manufactured by TAIYO YUDEN or MPZ1608S300ATAH0 manufactured by TDK is
recommended) to directly isolate DTE from DCE in the power circuit. Figure 3-2
shows the recommended power circuit of MU709 module.
Figure 3-2 Recommended power circuit of MU709 module
When the system power restarts, a discharge circuit is recommended to make sure
the power voltage drops below 1.80 V for 1s at least.

3.3.3 Output Power Supply Interface

Output power supply interface is VCC_EXT1, USIM_VCC and SD_VCC.
Through VCC_EXT1, the module can supply 1.8 V power externally with an output
current of 10 mA (typical value) for external level conversion or other applications. If
the module is in sleep mode, the output power supply interface is in the low power
consumption state (< 500 μA). If the module is in power down mode, the output power
supply is in the disabled state.
Through the USIM_VCC power supply interface, the module can supply 1.8 V or 3 V
power to the USIM card.
The SD_VCC is SD card power that only used for debugging. Please reserve the test
point.

3.4 Signal Control Interface

3.4.1 Overview

The signal control part of the interface on the MU709 module consists of the following:
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Issue 09 (2017-12-15)
The rising time of VBAT should be 100 µs at least. Otherwise, the module will be powered off.
Power on/off (POWER_ON_OFF) pin
System reset (RESIN_N) pin
WAKEUP_IN signal (WAKEUP_IN) pin
WAKEUP_OUT signal (WAKEUP_OUT) pin
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Description of the Application Interfaces
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