Emc And Esd Features - Huawei ME909u-521 Hardware Manual

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide
Item
Temperature
cycle-Non
operating
ESD HBM (Human
Body Model)
ESD with DVK (or
embedded in the
host)
Groups ≥ 2

5.6 EMC and ESD Features

The following are the EMC design comments:
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The following are the requirements of ESD
Issue 05 (2017-12-15)
Test Condition
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High temperature: 85º C
Low temperature: –40º C
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Temperature change
slope: 6º C/min
 Operation mode: no
power
 Test duration: 168 h,
336 h, 500 h, 1000 h for
inspection point
 1 kV (Class 1 B)
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Operation mode: no
power
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Contact Voltage: ±2 kV,
±4 kV
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Air Voltage : ±2 kV, ±4 kV,
±8 kV
 Operation mode: working
with service connected
Attention should be paid to static control in the manufacture, assembly, packaging,
handling, storage process to reduce electrostatic damage to HUAWEI module.
RSE (Radiated Spurious Emission) may exceed the limit defined by EN301489 if
the antenna port is protected by TVS (Transient Voltage Suppressor), which is
resolved by making some adjustment on RF match circuit.
TVS should be added on the USB port for ESD protection, and the parasitic
capacitance of TVS on D+/D- signal should be less than 2 pF. Common-mode
inductor should be added in parallel on D+/D- signal.
TVS should be added on the USIM interface for ESD protection. The parasitic
capacitance of TVS on USIM signal should be less than 10 pF.
Resistors in parallel and a 10 nF capacitor should be added on RESIN_N signal
and POWER_ON_OFF signal to avoid shaking, and the distance between the
capacitor and the related pin should be less than 100 mil.
PCB routing should be V-type rather than T-type for TVS.
An integrated ground plane is necessary for EMC design.
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Copyright © Huawei Technologies Co., Ltd.
Electrical and Reliability Features
Standard Sample
size
JESD22- 50
A104-C pcs/group
JESD22- 3 pcs/group
A114-D
IEC6100 2 pcs
0-4-2
environment control:
Results
Visual inspection: ok
Function test: ok
RF specification: ok
Cross section: ok
Visual inspection: ok
Function test: ok
RF specification: ok
Visual inspection: ok
Function test: ok
RF specification: ok
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