SIM Tech SIMCom SIM800C User Manual

Smart Machine Smart Decision
SIM800C_Hardware_Design_V1.00 25 2014-10-30
4.5. Serial Port and USB Interface
SIM800C default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data
Communication Equipment). The following figure shows the connection between module and client (DTE).
Table 8: Serial port and USB pin definition
Note: Hardware flow control is disable by default. AT command “AT+IFC=2, 2”can enable hardware flow
control. AT command “AT+IFC=0,0”can disable hardware flow control. For more details please refer to
document [1].
Table 9: Serial port characteristics
Symbol
Min
Max
Unit
V
IL
-0.3
0.7
V
V
IH
2.1
3.1
V
V
OL
-
0.4
V
V
OH
2.4
-
V
SIM800C module can support dual serial port function, that need execute AT command "AT+CMNRP=1"first.
Dual serial port including one full modem serial port and one three-wire serial port, pin definition is different with
standard definition of the Figure 2: Pin assignment (Top view) and Table 5: Pin description. For more details
please refer to Document [2].
4.5.1 Function of Serial Port
Serial port:
 Full mode device.
 Contains data lines UART1_TXD and UART1_RXD, hardware flow control lines UART1_RTS and
UART1_CTS, status lines UART1_DTR, UART1_DCD and UART1_RI.
Pin name
Pin number
Function
Serial port
UART1_DTR
6
Data terminal ready
UART1_RI
7
Ring indicator
UART1_DCD
5
Data carrier detect
UART1_CTS
4
Request to send
UART1_RTS
3
Clear to send
UART1_TXD
1
Transmit data
UART1_RXD
2
Receive data
UART2_TXD
22
Transmit data
UART2_RXD
23
Receive data
Debug port
USB_VBUS
24
USB power supply
USB_DP
25
USB_DN
26

SIM Tech SIMCom SIM800C Specifications

General

Module Type	GSM/GPRS Module
Frequency Bands	GSM 850/900/1800/1900 MHz
GPRS mobile station	Class B
Compliant to GSM phase	2/2+
USSD	Supported
Operating Temperature	-40°C to +85°C
Product Type	GSM/GPRS Module
GPRS Class	Class 12
Coding scheme	CS-1, CS-2, CS-3 and CS-4
SMS	Text and PDU modes
Interfaces	UART, SPI, I2C, GPIO, ADC
Power Supply	DC
Supply voltage range	3.4V to 4.4V
Transmitting power	Class 4 (2W) @850/900MHz, Class 1 (1W) @1800/1900MHz
Data Rate	GPRS multi-slot class 12: max. 85.6 kbps (uplink & downlink)
TCP/IP	Embedded TCP/IP stack

Summary

SIM800C Overview

SIM800C Key Features

SIM800C Operating Modes

Package Information

SIM800C Pin Out Diagram

SIM800C Pin Description

SIM800C Package Dimensions

Application Interface

SIM800C Power Supply

Detailed information on the power supply requirements and reference circuits.

SIM800C Power Supply Pins

Specifics about VBAT, GND, VRTC pins and VDD_EXT output.

SIM800C Power On/Down Scenarios

Scenarios and timing for powering the module on and off.

SIM800C Power Down Procedures

Methods for powering down the SIM800C module, including PWRKEY and AT command.

SIM800C Power Saving Modes

Details on Minimum Functionality Mode and Sleep Modes.

SIM800C Serial Port and USB Interface

Details on serial port, USB interface, and pin definitions.

SIM800C Serial Interface Details

SIM800C USB Debug Interface

SIM800C Software Upgrade

Methods for upgrading module firmware via USB or UART.

SIM800C Audio Interfaces

SIM800C SIM Card Interface

Details on the SIM card interface, compliance, and supported card types.

SIM800C SIM Card Design Guide

SIM800C SIM Card Holder Design

SIM800C Network Status (NETLIGHT)

SIM800C Operating Status (STATUS)

SIM800C Antenna Interface

Requirements for GSM antenna impedance, VSWR, and isolation.

SIM800C GSM Antenna Circuit

PCB Layout Guidelines

SIM800C PCB Pin Assignment

SIM800C PCB Layout Principles

General guidelines for PCB layout to minimize interference and noise.

SIM800C Electrical, Reliability, Radio

SIM800C Absolute Maximum Ratings

Stress ratings beyond which permanent damage may occur.

SIM800C Operating Conditions

Voltage and temperature ranges for normal operation.

SIM800C Digital Interface Specs

SIM800C SIM Interface Specs

SIM800C Current Consumption

Current consumption values under various operating modes and conditions.

SIM800C ESD Characteristics

SIM800C Radio Characteristics

RF output power, receive sensitivity, and operating frequencies.

SIM800C Manufacturing

SIM800C Moisture Sensitivity Level

SIM800C Baking Requirements

SIM800C Safety Cautions