Pin Description; Application Guide - SimCom SIM5215 Hardware Design

3.3.1

Pin Description

Table 8: Pin description
Pin type Pin name
UART_RXD
UART_TXD
UART_RTS
UART
UART_CTS
UART_DTR
UART_DCD
UART_RI
More pin information refers to chapter 2.2.
Table 9: Logic level
Parameter
Logic low input
Logic high input
Logic low output
Logic high output
Note: VDD_EXT (=2.6V) is e reference voltage in module internal interface.
All pins of all serial ports have 8mA driver capacity.
3.3.2

Application Guide

If UART port is used in Null Modem, the pin "RI" can be used as an interrupt signal to HOST. Normally it
will keep high logic level until certain condition such as receiving SMS, voice call (CSD, video) or URC
reporting, then "RI" will change to low logic level to inform the master (client PC). It will stay low until
the master clears the interrupt event with AT command.
SIM5215&SIM5216_Hardware Design_V2.02
Pin No. I/O
64 I
6 O
63 O
7 I
62 I
8 O
61 O
Min
0
0.7 *VDD_EXT
GND
VDD_EXT -0.2
Smart Machine Smart Decision
Active voltage
H
H
H
H
H
H
H
Max
0.3*VDD_EXT
VDD_EXT +0.3
0.2
VDD_EXT
29
Default Status
Pull-Down
Pull-Up
Pull-Up
Pull-Up
Unit
V
V
V
V
2012-08-31