User Guide

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24
GM500-U1G_A
Hardware Development Guide
V
IH
max = 2.1V
SPI Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
SPI_MISO 32 IO SPI main input slave
output
V
OL
max = 0.45V
V
OH
min = 1.35V
V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
VIH max = 2.1V
1.8V power domain
SPI_MOSI 33 IO SPI main output slave
input
V
OL
max = 0.45V
V
OH
min = 1.35V
V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
VIH max = 2.1V
1.8V power domain
SPI_CLK 34 DO SPI clock V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
SPI_CS_N 35 DO SPI segment V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
Other Pins
Pin Name Pin NO. I/O Description DC Characteristics Comment
WAKEUP_IN 72 DI Sleep mode control,
External device
wakeup module
V
IL
min = -0.3V
V
IL
max = 0.45V
V
IH
min = 1.53V
V
IH
max = 2.1V
1.8V power domain.
Pull-down internally.
Edge-triggered, Rising edgewake up
module; Falling edge module can enter
sleep.
If use this signal, please add a pull-up
resistor externally.
WAKEUP_OUT 71 DO wakeup output
signal,wake up the
external devices
V
OL
max = 0.8V
V
OH
min = 1.35V
Wakeup external circuits
GPIO 27, 28, 29, 30, 64,
65, 75, 76, 77
IO General input/output V
OL
max = 0.45V
V
OH
min = 1.35V
V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
VIH max = 2.1V
If unused, keep them floating.
DO not pull-up PIN65 external
DO not pull-up PIN77 external
RESERVED
42, 43, 44, 45
RESERVED
2.4. Power Supply
2.4.1. Power Supply Pins
The GM500-U1G_A is supplied through the VBAT signal with the following characteristics.