VT-MOD-CELL-B48 Hardware User Manual
3
2.
Interface
2.1 Overview
This chapter mainly introduces the external interfaces of VT-MOD-CELL-B48 LTE
module, including:
LCC Interface
Antenna Interface
2.2 General LCC Interface
Interface Signals
Table 2-1 Definition of interface pins
Pin No.
Pin Name
Direction
(Refer to module)
Pin Definition
Remarks
1
Reserved
floating
2
Reserved
floating
3
SPI_CS2#
O
SPI chip selection
If not use, floating
4
SPI_MISO
I
SPI data bus (Master
input, Slave Output)
5
SPI_SCLK
O
6
SPI_MOSI
O
SPI data bus (Master
input, Slave Output)
7
GND
8
UART1_TXD
O
UART1 data transmit
9
UART1_RXD
I
UART1 data receive
10
UART0_TXD
O
UART0 data transmit
Debug interface
11
UART0_RXD
I
UART0 data receive
12
WPS_KEY
WPS button
13
GND
14
SDH0_D3
SDIO0 data 3
SDIO0 interface for
2.5G Wi-Fi; if not used,
floating;
15
SDH0_D2
SDIO0 data 2
16
SDH0_D1
SDIO0 data 1
17
SDH0_D0
SDIO0 data 0
18
SDH0_CMD
SDIO0 data command
19
SDH0_CLK
SDIO0 clock
20
GND
21
Reserved
Floating
22
WI-FI_RST#
O
Wi-Fi reset
Wi-Fi reset
23
GPIO_GPD4
O
GPIO
LTE RF Signal
Strength 3
24
GPIO_GPD2
O
GPIO
LTE RF Signal
Strength 1
25
GPIO_GPD6
O
GPIO
2.4G Wi-Fi_LED
&WPS_LED
26
GPIO_GPD3
O
GPIO
LTE RF Signal
Strength 2
