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L810-MiniPCIeHardware User Manual
Page 21 of 26
5.4.3 WAKE_HOST
WAKE_HOST signal is used to wake the host and indicate the incoming call and SMS or other data
request. Description for WAKE_HOST signal is as follows:
Pin
Pin name
I/O
Pin description
Voltage
17
WAKE_HOST
O
Wake up the host.
3.3V
Function definition for WAKE_HOST signal is as follows:
Operating mode
Status
Non-ringing
High level
Ringing
1s low level, then change to high level (pulse signal)
No SMS
High level
Incoming SMS
1s low level, then change to high level (pulse signal)
5.5 Reset signal
L810-MiniPCIe supports external reset function, and the module can be reset to the initial status through
PERST# signal. Description for PERST# signal is as follows:
Pin
Pin name
I/O
Pin description
Voltage
22
PERST#
I
External reset signal
3.3V
When PERST# signal keeps low for 100ms, the module will be reset. When MCU executes the reset
function, the PMU remains its power inside the module. If the module is connected to the PC port, the
virtual ports of PC will be restarted.
Note:
PERST# signal is a sensitive signal line, in the case of PCB Layout, RF interference shall be
kept away and grounding shall be processed properly. It’s recommended to add a filter capacitor
nearby the module.
Requirements for PERST# pulse width are as follows:
Parameter
Minimum value
Typical value
Maximum value
Unit
Pulse width
7
100
1000
ms
