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The reset scenario is illustrated in the following figure.
VBAT
RESET_N
Module
Status
NOTES
1.
Use RESET_N only when turning off the module by AT+QPOWD command and PWRKEY pin failed.
2.
Ensure that there is no large capacitance on PWRKEY and RESET_N pins.
3.9. USIM Card Interface
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 9: Pin Definition of the USIM Card Interface
Pin Name
Pin No.
USIM_VDD
14
USIM_DATA
15
USIM_CLK
16
USIM_RST
17
USIM_
13
PRESENCE
USIM_GND
10
EC21_Hardware_Design
≤460ms
≥150ms
≤0.5V
V
IL
Running
Figure 16: Timing of Resetting Module
I/O
Description
PO
Power supply for USIM card
IO
Data signal of USIM card
DO
Clock signal of USIM card
DO
Reset signal of USIM card
DI
USIM card insertion detection
Specified ground for USIM card
Confidential / Released
≥1.3V
V
IH
Resetting
Restart
Comment
Either 1.8V or 3.0V is supported
by the module automatically.
LTE Module Series
EC21 Hardware Design
39 / 94
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