LA02303B BLE Module Specification
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Better Life with Better IoT Innovation 9 / 20
3.2
Trap Pins
Table 3.2 Trap Pins Definition
No.
Pin of IC
Trap Pin Description
Note
29
26_P0_3
Power On Trap Pin Description
1:Normal operation mode(default)
0:Enter download mode
Don’t pull
down when Power on,
and otherwise the module will
enter download mode.
26
2_P2_2
There must not be any voltage drop
placed on ADC pin before module is
powered, because current input that
over 1mA will damage ADC channel
connect to this pin. (Digital function will
not be affected).
If used as ADC, There are two
modes for module:
Bypass mode (range: 0~0.9V):
ADC maximum input voltage
cannot exceed 0.9V in this mode,
and AUXADC full-scale voltage is
about 0.9V. If the input voltage
exceeds the ADC range, IC will be
damaged.
Divide mode (range: 0~3.3V)
：
In this mode, AUXADC full-scale is
3.3V in this mode. When the input
voltage is 3.3~3.6V, the ADC value
may be out of range, causing
measurement error.
28
4_P2_4
30
5_P2_5
19
16_RST_N
The module has RC circuit connect to
the Reset pin, there is no need to add
RC externally, and otherwise it will cause
abnormal operation.
-
20
17_P4_3
If used as I2C SDA, an external pull up
resistor is suggested to be reserved.
-
18
18_P4_2
If used as I2C SCL, an external pull up
resistor is suggested to be reserved.
-
28
4_P2_4
ADC1/IO9
Analog-to-Digital Converter 1/GPIO 9
Pull Down
I/O
29
26_P0_3
IO7
GPIO 7
Pull Up
I/O
30
5_P2_5
ADC2/IO10
Analog-to-Digital Converter 2/GPIO
10
Pull Down
I/O
31
49
GND
Ground of Module
-
-
32
49
GND
Ground of Module
-
-
