Huawei MG323 manual SIM Card Interface, Overview, Pin No, Signal Name, Description

HUAWEI MG323 GSM M2M Module
Hardware Guide	Description of the Application Interfaces

Figure 3-9The signal through the RING after the MG323 receives an SM

When an MG323 Module receives a voice call, a periodical low level signal for 1s and a high level signal for 4s are output by RING, as shown in Figure 3-10 .

Figure 3-10The signal through the RING after the MG323 receives a voice call

4s 4s 4s

1s 1s 1s

For detailed application of the MG323 UART1 interface, see HUAWEI Module UART Serial Port Design Guide.

The maximum level of UART1_DCD, UART1_RING, UART1_DSR and UART1_DTR signals is 3.2 V, and the maximum level of UART1_TD, UART1_RD, UART1_CTS and UART1_RTS signals is 3.25 V. Therefore, if the UART signals need to be connected the signal with 3.3 V, a level conversion curcuit is required.

UART1 interface must be powered on after the module is powered on to avoid the wind blow in which may cause the module cannot work properly.

The level of RS-232 Transceivers must match that of the MG323 module.

3.7SIM Card Interface

3.7.1Overview

The MG323 module provides a SIM card interface complying with the ISO 7816-3 standard and supports automatic detection of a Class B SIM card or a Class C SIM card. Table 3-7lists the SIM card interface signals.

Table 3-7SIM card interface signals

Pin No.	Signal Name	I/O	Description
1	SIM_CLK	O	Clock signal of the SIM card
3	VSIM	P	Power supply of the SIM card
5	SIM_DATA	I/O	Data signal of the SIM card
7	SIM_RST	O	Reset signal of the SIM card

Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	25
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