Gpio Expander - mangOH Yellow Hardware Architecture Manual

mangOH Yellow Hardware Architecture Guide

2.4.4 GPIO Expander

The mangOH Yellow includes one SX1509 16-channel GPIO/PWM expander (U503), as detailed in
expander provides additional GPIOs (carried over the CF3 module's I2C1 interface) that are used for internal I/O
functions such as driving LEDs, resetting board components, etc.
For detailed specifications, see the mangOH Yellow schematics at mangoh.io/mangoh-yellow-resources-hardware.
Table 2-4: GPIO Expander (U503) Signals
Pin Signal Name
I/O 0 TP500
I/O 1 WL_REG_ON
I/O 2 TP501
I/O 3 BT_DEV_WAKE
I/O_4 GENERIC_LED
I/O_5 PCM_EXP_SEL
I/O_6 TP502
I/O_7 TRI_LED1
I/O_8 CARD_DETECT_IOT0
I/O_9 BATTGAUGE_GPIO
I/O_10 TRI_LED3
I/O_11 BAT_VOL_MONITOR
I/O_12 CHARGER_INT_N
I/O_13 MAG_DATA_READY
I/O_14 RTC_INT
I/O_15 TRI_LED2
Rev 2 Oct.19
Purpose
Test point
Turn on/off Wi-Fi+BT module's Wi-Fi radio (U300)
Test point
Wake BT radio (U300)
Generic green LED control (D402)
Connect PCM interface to IoT0 or to PCM codec (audio) via U602
Test point
Generic tri-color LED (D500) (BLUE) control
Indicates whether IoT expansion card is present
Signal from battery fuel gauge
Generic tri-color LED (D500) (RED) control
Signal from battery voltage monitor
Interrupt from battery charger
Geomagnetic sensor data ready
Interrupt from real-time clock
Generic tri-color LED (D500) (GREEN) control
22
Table 2-4. The
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