LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 20 / 67
6
1.5V
NC
Not connected
7
CLKREQ#
RESERVED
Reserved
8
UIM_PWR
USIM_VDD
PO
Power supply for the
(U)SIM card
9
GND
GND
Mini card ground
10
UIM_DATA
USIM_DATA
IO
Data signal of (U)SIM card
11
REFCLK-
UART_RX
DI
UART receive data
Connect to
DTE’s TX
12
UIM_CLK
USIM_CLK
DO
Clock signal of (U)SIM card
13
UART_TX
DO
UART transmit data
Connect to
DTE’s RX
14
UIM_RESET
USIM_RST
DO
Reset signal of (U)SIM card
15
GND
GND
Mini card ground
16
UIM_VPP
RESERVED
Reserved
17
RESERVED
RI
DO
Ring indication
18
GND
GND
Mini card ground
19
RESERVED
RESERVED
Reserved
20
W_DISABLE#
W_DISABLE#
DI
Airplane mode control
Pulled up by
default.
Active low.
21
GND
GND
Mini card ground
22
PERST#
PERST#
DI
Fundamental reset signal
Pulled up by
default.
Active low.
23
PERn0
UART_CTS
DI
UART clear to send
Connect to
DTE’s RTS
24
3.3Vaux
RESERVED
Reserved
25
PERp0
UART_RTS
DO
UART request to send
Connect to
DTE’s CTS
26
GND
GND
Mini card ground
27
GND
GND
Mini card ground
28
1.5V
NC
Not connected