CLM920_NC3_LTE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 16 of 37
generate more than 2A current, the ripple voltage drop will occur on the power supply voltage, so the
power supply voltage must not be lower than 3.3V.
Figure 3-6 GSM TDMA Burst Current Supply Voltage Drop
3.4 Switching machine reset mode
The CLM920_NC5 Mini PCIE module only supports power-on and power-on mode. The user can
check whether the module is powered on by querying the high and low levels of the VDD_EXT pin.
Table 3-4 Switching machine reset pin definition
Pin
Signal name
I/O
High value
Description
22
RESET
DI
1.8V
Module reset control pin, low effective
28
PWRKEY
PI
VBAT-0.3V
Low level boot
3.4.1 Boot Timing
Figure 3-7 Startup timing diagram
Table 3-5 boot timing parameters