CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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The power-on time of any interface of the module must not be earlier than the boot time of
the module, otherwise the module may be abnormal or damaged.
5.5 Electrostatic property
There is no overvoltage protection inside the CLM920 AC3 module. The ESD protection is
required when the module is used to ensure product quality.
ESD design recommendations:
The USB port needs to add TVS on VDD, D+, D- for protection, and the TVS parasitic
capacitance on D+/D- is <2pF;
The module's USIM card external pin needs to be protected by TVS, and the parasitic
capacitance requirement is <10pF.
The PCB layout of the protective device should be as close as possible to the "V" line to
avoid the "T" line.
The ground plane around the module guarantees integrity and should not be split.
ESD control of the surrounding environment and operators is required during module
production, assembly and laboratory testing
。
Table 5-4 CLM920 AC3 ESD Features
Test port
Contact discharge
Air discharge
unit
USB interface
±
4
±
8
KV
USIM interface
±
4
±
8
KV
VBAT power supply
±
4
±
8
KV
5.6 Reliability index
Table 5-5 CLM920 AC3 Reliability Test
Test items
Test Conditions
Guideli
ne
Test Results
Low
temperature
work
Temperature:
–
40oC
Working mode: normal work
Test duration: 24h
IEC600
68-2-1
Visual inspection: normal
Function check: normal
RF indicator check: normal
High
Temperature: 85oC
JESD2
Visual inspection: normal
