User Guide

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19
GM500-U1G_A
Hardware Development Guide
USIM1_DATA 38 IO Data signal of USIM1
card
For 1.8V USIM:
V
IL
max = 0.63V
V
IH
min = 1.17V
V
OL
max = 0.45V
V
OH
min = 1.35V
For 3V USIM:
V
IL
max = 1.05V
V
IH
min = 1.95V
V
OL
max = 0.45V
V
OH
min = 2.6V
Pull-up to USIM1_VCC with 10k
resistor internally
USIM1_CLK 37 DO Clock signal of USIM1
card
For 1.8V USIM:
V
OL
max = 0.45V
V
OH
min = 1.35V
For 3V USIM:
V
OL
max = 0.45V
V
OH
min = 2.6V
USIM1_RST 39 DO Reset signal of USIM1
card
For 1.8V USIM:
V
OL
max = 0.45V
V
OH
min = 1.35V
For 3V USIM:
V
OL
max = 0.45V
V
OH
min = 2.6V
USIM1_DETECT 41 DI USIM1 card input
detection
V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
V
IH
max = 2.1V
1.8V power domain.Active low.
If do not need of USIM detect, leave
this pin not connected.
ADC Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
ADC1 48 AI Analog to digital 0.05V to 4.15V External sensor signal detection
ADC2 47 AI Analog to digital 0.05V to 4.15V External sensor signal detection
ADC3 108 AI Analog to digital 0.05V to 4.15V External sensor signal detection
Main UART Interface
Pin Name Pin NO. I/O Description DC Characteristics Comment
UART_TXD 53 DO Transmit data V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
UART_RXD 54 DI Receive data V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
V
IH
max = 2.1V
1.8V power domain
UART_RTS 55 DO Request to send V
IL
min = -0.3V
V
IL
max = 0.63V
V
IH
min = 1.17V
1.8V power domain