LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 21 / 67
29
GND
GND
Mini card ground
30
SMB_CLK
I2C_SCL
DO
I2C serial clock
Require
external
pull-up to
1.8V.
31
PETn0
DTR
DI
Sleep mode control
32
SMB_DATA
I2C_SDA
IO
I2C serial data
Require
external
pull-up to
1.8V.
33
PETp0
RESERVED
Reserved
34
GND
GND
Mini card ground
35
GND
GND
Mini card ground
36
USB_D-
USB_DM
IO
USB differential data (-)
Require
differential
impedance
of 90
Ω.
37
GND
GND
Mini card ground
38
USB_D+
USB_DP
IO
USB differential data (+)
Require
differential
impedance
of 90
Ω.
39
3.3Vaux
VCC_3V3
PI
3.0V~3.6V, typically 3.3V
DC supply
40
GND
GND
Mini card ground
41
3.3Vaux
VCC_3V3
PI
3.0V~3.6V, typically 3.3V
DC supply
42
LED_WWAN#
LED_WWAN#
OC
LED signal for indicating the
network status of the
module
Active low
43
GND
GND
Mini card ground
44
LED_WLAN#
USIM_
PRESENCE
DI
(U)SIM card insertion
detection
45
RESERVED
PCM_CLK
1)
IO
PCM clock signal
46
LED_WPAN#
RESERVED
Reserved