Power-On/Off/Reset Scenarios; Turn On The Module Using The Pwrkey - Quectel UG89 Hardware Design

The following figure shows a reference design for a +5V input power source. The typical output of the
power supply is about 3.8V and the maximum load current is 3.0A.
DC_IN
470uF 100nF

3.6. Power-on/off/Reset Scenarios

3.6.1. Turn on the Module Using the PWRKEY

The following table shows the pin definition of PWRKEY.
Table 8: Pin Description of PWRKEY
Pin Name Pin No.
PWRKEY 79
When UG89 is in power-down mode, it can be turned on to normal mode by driving the PWRKEY pin to a
low level for at least 500ms. It is recommended to use an open drain/collector driver to control the PWRKEY.
A simple reference circuit is illustrated in the following figure.
UG89_Hardware_Design
MIC29302WU
2
IN
51K
4.7K
VBAT_EN
47K
Figure 5: Reference Circuit of Power Supply
I/O
DI
4
OUT
100K
1%
470R
47K
1%
Description
Turn on/off the module
UMTS/HSPA+ Module Series
UG89 Hardware Design
VBAT
470uF
100nF
Comment
VBAT power domain
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