Gpio Expanders - mangOH Green DV4 Developer's Manual

mangOH Green (DV4) Developer's Guide

GPIO Expanders

The mangOH Green includes three SX1509 16/32 GPIO/PWM expanders, as detailed in
These provide additional GPIOs (over the primary CF3 module's I2C1 interface) used for internal I/O
functions such as driving LEDs, resetting board components, etc.
For detailed specifications, see the mangOH Green schematics at mangoh.io.
Table 2-5: GPIO Expander Signals
Desig GPIO Pin Signal Name
U903 I/O_0 27 ARDUINO_RESET_Level shift
I/O_1 28 BattChrgr_PG_N
I/O_2 1 BattGauge_GPIO
I/O_3 2 LED_ON
I/O_4 5 ATmega_reset_GPIO
I/O_5 6 connect_to_AV_LED
I/O_6 7 PCM_ANALOG_SELECT
I/O_7 8 connect_to_AV_LED
I/O_8 13 Board_rev_res1
I/O_9 14 Board_rev_res2
I/O_10 15 UART_EXP1_ENn
I/O_11 16 UART_EXP1_IN
I/O_12 17 UART_EXP2_IN
I/O_13 20 SDIO_SEL
I/O_14 21 SPI_EXP1_ENn
I/O_15 22 SPI_EXP1_IN
Rev 2 Jun.16
Purpose
Arduino-compatible circuit reset (connected to reset button (SW1500)
Indicate 'power good' from battery charger
Query battery charge level
Set HIGH to disable LEDs on-board (see U702 on schematic)
Arduino-compatible circuit reset (via system reset)
Input from onboard function button used to connect to AirVantage server
S/W control (via API) to select either digital or analog audio for primary CF3
LED to indicate AirVantage connection
User-configurable
User-configurable
UART multiplexer control (internal)
UART multiplexer control (internal)
UART multiplexer control (internal)
SDIO multiplexer control (internal)
SPI multiplexer control (internal)
SPI multiplexer control (internal)
20
Table 2-5.
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