SIM800C datasheet(24/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

RT C

Core

1.5K

M odule

VR T C

N on-chargeable

B ackup B attery

Figure 16: RTC supply from non-chargeable battery



Rechargeable battery backup

RT C

Core

1.5K

Module

VR T C

R echargeable

B ackup B attery

Figure 17: RTC supply from rechargeable battery

Note: When shut off VBAT and power on VRTC only, the clock error becomes larger.

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 disabled by default. AT command “AT+IFC=2, 2”can enable hardware flow

Pin name

Pin number

Function

UART1_DTR

Data terminal ready

UART1_RI

Ring indicator

UART1_DCD

Data carrier detect

UART1_CTS

Clear to send

UART1_RTS

Request to send

UART1_TXD

Transmit data

UART1_RXD

Receive data

UART2_TXD

Transmit data

Serial port

UART2_RXD

Receive data

USB_VBUS

USB power supply

USB_DP

D+ data input/output

Debug port

USB_DN

D- data input/output

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