Gosuncn Technology Group Co. Ltd. GM500U1A Manual De Usuario
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Permission
19
GM500_U1A
Hardware Development Guide
UART_DSR
57
DO
Data set ready
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_DTR
58
DI
Data terminal ready
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_DCD
59
DO
Data carrier
detection
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
UART_RI
60
DO
Ring indicator
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain,
DO not pull-up
external
Debug UART Interface
Pin Name
Pin NO.
I/O
Description
DC Characteristics
Comment
UART_DEBUG_TXD
68
DO
Transmit data
V
OL
max = 0.45V
V
OH
min = 1.35V
1.8V power domain
UART_DEBUG_RXD
67
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
RF Interface
Pin Name
Pin NO.
I/O
Description
DC Characteristics
Comment
MAIN_ANT
62
IO
Main antenna
50Ω impedance
DIV_ANT
79
AI
Diversity antenna
50Ω impedance
GNSS_ANT
10
IO
GNSS antenna
50Ω impedance
I2C Interface
Pin Name
Pin NO.
I/O
Description
DC Characteristics
Comment
I2C_SCL
73
DO
I2C serial clock
V
OL
max = 0.45V
V
OH
min = 1.35V
Pull-up to 1.8V through external 2.2K
resistance, active low
I2C_SDA
74
IO
I2C serial data
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
V
IH
max = 2.1V
Pull-up to 1.8V through external 2.2K
resistance, active low
SDIO Interface
Pin Name
Pin NO.
I/O
Description
DC Characteristics
Comment
SDIO_CMD
14
IO
Secure digital CMD
V
OL
max = 0.45V
V
OH
min = 1.35V
V
IL
min = -0.3V
Pull-up to 1.8V through external 10K
resistance, active low