Product Manual

8
Pin
No.
Symbol I/O
Type
Function
15 GND P Power supply reference ground pin
16 CEN I/O Chip enabling pin, which is active at a low level
and is connected to the CEN pin on the internal IC
17 ADC3 AI ADC pin, which is connected to the P23 pin on the
internal IC
18 GND P Power supply reference ground pin
Note:
1. P indicates power supply pins, I/O indicates input/output pins, and AI indicates analog
input pins.
2. CEN is only a hardware reset pin and cannot clear the Wi-Fi network configuration.
2.3 Test Pin Definition
Table 2-2 WB1S test pins
Pin No. Symbol I/O Type Function
N/A SO I/O Data output pin when data is downloaded from
the flash memory, which is used for module
production and firmware burning and is
connected to the P23 or ADC3 pin on the
internal IC
N/A SI I/O Data input pin when data is downloaded from
the flash memory, which is used for module
production and firmware burning and is
connected to the P22 pin on the internal IC
N/A CS I/O Chip selection pin when data is downloaded
from the flash memory, which is used for
module production and firmware burning and is
connected to the P21 pin on the internal IC