User Manual

Pin # Pin Name Pin Type Description
16 UART_TXD Digital I/O,
Programmable pull up
• Wi-Fi UART TxD output pin.
• Used only for debug development
purposes. It is recommended to add a
test point for this pin.
17 UART_RXD Digital I/O,
Programmable pull up
• Wi-Fi UART RxD input pin.
• Used only for debug development
purposes. It is recommended to add a
test point for this pin.
18 VBAT Power Power supply pin for DC/DC converter and PA.
19 CHIP_EN Digital Input • PMU enable pin.
• When the CHIP_EN pin is asserted high,
the module is enbled. When the
CHIP_EN pin is asserted low, the module
is disabled or put into Power-Down mode.
• Connect to a host output that is low by
default at power-up. If the host output is
tri-stated, add a 1 MOhm pull down
resistor if necessary to ensure a low level
at power-up.
20 RTC_CLK Digital I/O,
Programmable pull up
• RTC Clock input pin.
• This pin must connect to a 32.768 kHz
clock source.
21 GND GND Ground pin.
22 GPIO8 Digital I/O,
Programmable pull up
General Purpose Input/Output pin.
23 SPI_SCK Digital I/O,
Programmable pull up
SPI clock pin.
24 SPI_MISO Digital I/O,
Programmable pull up
SPI MISO (Master In Slave Out) pin.
25 SPI_SSN Digital I/O,
Programmable pull up
Active-low SPI SSN (Slave Select) pin.
26 SPI_MOSI Digital I/O,
Programmable pull up
SPI MOSI (Master Out Slave In) pin.
27 GPIO7 Digital I/O,
Programmable pull up
General Purpose Input/Output pin.
28 GND GND Ground pin.
29 GPIO17 Digital I/O,
Programmable pull up
General Purpose Input/Output pin.
30 GPIO18 Digital I/O,
Programmable pull up
General Purpose Input/Output pin.
ATWINC3400-MR210CA
© 2017 Microchip Technology Inc.
Draft Datasheet Preliminary
DS00000000A-page 9