Data Sheet

HJ-531IMF
TangShan HongJia Electronic Technology Co., Ltd.
- 6 -
3.2 Pin Definition
Table 3-1 Pin definition table
Pin
Name
Type
Description
Function
1
P0.9
(Connection
Status )
GPIO
(OUTPUT)
General I/O
Connection status (connection =
1; disconnect = 0)
2
P0.7
(APP data
coming point)
GPIO
General I/O
Whether the module is a host or
slave, this pin is raised during
data is sent out through the TX
pin of the module's serial port,
and this pin can be lowered only
after data is sent out.
Usually this pin keeps a low
level to represent idleness. This
pin is used as a wake-up sign for
long-time connections to
low-power devices.
3
P0.5
GPIO
General I/O
BLE UART TX pin