Installation Instructions

WF-M620-RSD2
IEEE 802.11a/b/g/n 1T1R IoT Module
Sichuan AI-Link Technology Co., Ltd. page 7 of 16
Note：
1.ISU is a serial communication block which can be configured as I2C master. I2C slave, SPI master, SPI slave, or
UART; I2C runs at up to 1MHz, SPI at up to 40MHz, and UARTs at up to 3Mbps.
2.The MT3620AN ADC VREF maximum is 2.5V.Should not input >2.5V when using the ADC because the ADC will not
read any value higher than 2.5V.If the ADC pin is not configured for ADC operation,then 3.3V input is ok.
3.WF-M620-RSD2 RTC functionality is enabled, the AVDD_3V3_RTC must be always powered, or the MT3620 will
hang up during the system boot procedure.
4.The power supply for all GPIO pins is 3.3V.
46
GPIO56/TX0
DIO
GPIO multiplexed with I2S 0
47
GPIO57/MCLK0
DIO
GPIO multiplexed with I2S 0
48
GPIO58/FS0
DIO
GPIO multiplexed with I2S 0
49
GPIO59/RX0
DIO
GPIO multiplexed with I2S 0
50
GPIO60/BCLK0
DIO
GPIO multiplexed with I2S 0
51
GPIO66/SCLK3/TXD3
DIO
GPIO multiplexed with ISU3 functions(SPI CLK/UART TX)
52
GPIO67/MOSI3/RTS3/SCL3
DIO
GPIO multiplexed with ISU3 functions(SPI MOSI/UART RTS/I2C CLK)
53
GPIO68/MISO3/RXD3/SDA3
DIO
GPIO multiplexed with ISU3 functions(SPI MISO/UART RX/I2C DATA)
54
GPIO69/CSA3/CTS3
DIO
GPIO multiplexed with ISU3 functions(SPI CSA/UART CTS)
55
GPIO70/CSB3
DIO
GPIO multiplexed with ISU3 functions(SPI CSB)
56
GPIO72/MOSI4/RTS4/SCL4
DIO
GPIO multiplexed with ISU4 functions(SPI MOSI/UART RTS/I2C CLK)
57
GPIO73/MISO4/RXD4/SDA4
DIO
GPIO multiplexed with ISU4 functions(SPI MISO/UART RX/I2C DATA)
58
GND
P
Ground
59
GND
P
Ground
60
GND
P
Ground
61
GND
P
Ground
62
SYSRST_N
DI
System reset,active low.
63
SERVICE_TXD
DO
Azure Sphere Service UART TXD
Service UART is the main interface
for PC to communicate with the
Azure Sphere OS.Core A7 app
debugging, sideload, manufacturing
test, getting device ID operation all
use the Service UART port.
64
SERVICE_RTS
DO
Azure Sphere Service UART RTS
65
SERVICE_RXD
DI
Azure Sphere Service UART RXD
66
SERVICE_CTS
DI
Azure Sphere Service UART CTS
67
RECOVERY_RXD
DI
Azure Sphere flash re-imaging Recovery UART RXD
Recovery UART is
for upgrading the
Azure Sphere OS
without connection
to the Internet.
68
RECOVERY_TXD
DO
Azure Sphere flash re-imaging Recovery UART TXD
69
RECOVERY_RTS
DO
Azure Sphere flash re-imaging Recovery UART RTS
70
RECOVERY_CTS
DI
Azure Sphere flash re-imaging Recovery UART CTS
71
IO0_GPIO85/IO0_RXD
DI
Dedicated GPIO multiplexed with UART for I/O CM4F 0
72
IO0_GPIO86/IO0_TXD
DO
Dedicated GPIO multiplexed with UART for I/O CM4F 0
73
GND
P
Ground
74
GND
P
Ground