Specifications

SIM7912&SIM7906 Hardware Design V1.02
www.simcom.com 18 / 85
Pin name
Pin
No.
Electrical description
Description
Comment
RESIN_N
1
DI,PU
P3
Reset the module,
active low
1.8V power domain.
Pulled up internally.
Active low.
PWRKEY
2
DI,PU
P3
Power on/off the module,
active low
1.8V power domain.
Pulled up internally.
Active low.
Status indication
Pin name
Pin
No.
Electrical description
Description
Comment
NET_MODE
147
DO
P3
Indicate the module’s
network registration
mode
1.8V power domain. If
unused, keep it open.
NET_STATUS
170
DO
P3
Indicate the module’s
network activity status
1.8V power domain. If
unused, keep it open.
STATUS
171
DO
P3
Indicate the module’s
operation status
1.8V power domain. If
unused, keep it open.
USB interface
Pin name
Pin
No.
Electrical description
Description
Comment
USB_VBUS
32
PI
V
MAX
=5.25V
V
MIN
=3.3V
USB VBUS detection
Not support charge
USB_ DP
34
AIO
Differential USB
bi-directional data plus
Required 90Ω differential
impedance
Compliant with USB 2.0
standard specifications
USB_ DM
33
AIO
Differential USB
bi-directional data minus
USB_SS_TX_P
38
AO
USB3.0 super-speed
transmit data plus
Required 90Ω differential
Impedance
Compliant with USB 3.0
standard specifications
USB_SS_TX_M
37
AO
USB3.0 super-speed
transmit data minus
USB_SS_RX_P
40
AI
USB3.0 super-speed
receive data plus
USB_SS_RX_M
41
AI
USB3.0 super-speed
receive data minus
USB_ID
36
DI
P3
OTG identification
1.8V power domain.
If unused, keep it open.
OTG_PWR_EN
143
DO,PD
P3
USB OTG power supply
DC-DC enable signal
1.8V power domain.
If unused, keep it open.
SIM interface
Pin name
Pin
No.
Electrical description
Description
Comment
SIM1_VDD
26
PO
For 1.8V
SIM:
Power supply for SIM1
card
Either 1.8V or 3.0V is
supported by the module