Turn Off Module - Quectel EG91 Series Hardware Design

The power-up scenario is illustrated in the following figure.
VBAT
PWRKEY
VDD_EXT
BOOT_CONFIG &
USB_BOOT Pins
RESET_N
STATUS
(DO)
UART
USB
NOTE
1. Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is no less
than 30 ms.
2. PWRKEY can be pulled down directly to GND with a recommended 10 kΩ resistor if the module
needs to be powered on automatically and shutdown is not needed.
3. BOOT_CONFIG pins (SPI_CLK, USB_BOOT, PCM_CLK, PCM_SYNC) cannot be pulled up
before startup.

3.7.2. Turn off Module

Either of the following methods can be used to turn off the module normally:
 Use the PWRKEY pin.
 Use AT+QPOWD.
EG91_Series_Hardware_Design
NOTE 1
≥ 500 ms
≤ 0.5 V
V
IL
About 100 ms
≥ 100 ms. After this time, the BOOT_CONFIG
pins can be set to high level by external circuit.
≥ 10 s
I nactive
I nactive
Figure 12: Power-up Timing
LTE Standard Module Series
V = 0 . 8 V
IH
≥ 12 s
≥ 13 s
Active
Active
40 / 105