Turn Off Module; Turn Off Module Using The Pwrkey Pin - Quectel UC20 Hardware Design

NOTE
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
recommended to be 30ms.

3.7.2. Turn off Module

The following procedures can be used to turn off the module:

Normal power down procedure: Turn off the module using the PWRKEY pin.

Normal power down procedure: Turn off the module using command AT+QPOWD.

Automatic shutdown: Turn off the module automatically if under-voltage or over-voltage is detected.

3.7.2.1. Turn off Module Using the PWRKEY Pin

Driving the PWRKEY to a low level voltage at least 0.6s, the module will execute power-down procedure
after PWRKEY is released. The power-down scenario is illustrated as the following figure.
UC20_Hardware_Design
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1
VBAT
≥ 100ms
PWRKEY
V
IL
RESET_N
STATUS
(OD)
UART
USB
Figure 11: Timing of Turning on Module
≥ 1.3V
V
IH
≤ 0.5V
1.3 ~ 1.9s
≥ 5s
Inactive
≥ 5s
Inactive
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
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Active
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