User Guide

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50
GM500-U1G_A
Hardware Development Guide
document [AT Command Reference Guide of Module Product GM500-U1G_A].
NOTE: All the GPIO pins are pull-down internally and are input pins in default.
Table 2-23Pin Definition of GPIO
Pin Name Pin NO. I/O Description Comment
GPIO1 27 IO
General input/output
1.8V power domain,
GPIO2 28 IO
General input/output
1.8V power domain
GPIO3 29 IO
General input/output
1.8V power domain
GPIO4 30 IO
General input/output
1.8V power domain
GPIO5 64 IO
General input/output
1.8V power domain
GPIO6 65 IO
General input/output
1.8V power domain
DO not pull-up PIN65 external
GPIO7 75 IO
General input/output
1.8V power domain
GPIO8 76 IO
General input/output
1.8V power domain
GPIO9 77 IO
General input/output
1.8V power domain
DO not pull-up PIN77 external
2.17. USB_BOOT
Table2-24 Pin Definition of USB_BOOT
Pin Name Pin NO. I/O Description Comment
COEX_UART_R
X/USB_BOOT
8 DI LTE receiver sync for coexistence with
UART/Force boot from USB interface
Pull-up this pin to VREF_1V8 and then power on the module,
the module will enter emergency download mode.
It is strongly recommended to add test point.
Figure 2–34 USB_BOOTreference design
2.18. SDCardInterface
Table 2-25 Pin Definition ofSD controller Interface
Pin Name Pin NO. I/O Description Comment
SDC2_DATA3 109 IO Secure digital controller data bit 3
SDC signal level can be selected according to the
signal level supported by SD card. Please refer to SD
3.0 protocol for details.
If do not need SDC, leave this pin not connected.
SDC2_DATA2 110 IO Secure digital controller 2 data bit 2
SDC2_DATA1 108 IO Secure digital controller 2 data bit 1
SDC2_DATA0 113 IO Secure digital controller 2 data bit 0
SDC2_CMD 111 IO Secure digital controller 2 command