2.SYSTEM CONNECTOR INTERFACE

2.15External I 2C Serial Control Bus

Note! The I2C bus is currently not supported by the software

Pin

Signal

Dir

Description

 

 

 

 

29

SDA

I/O

I2C serial data

30

SCL

O

I2C serial clock

The external I2C bus consists of two signals, SDA and SCL. This bus is isolated from the module’s internal I2C bus to ensure proper operation of the module, even if the external I2C bus is damaged.

The electrical characteristics are shown below.

 

Parameter

Min.

Typ.

Max.

Units

 

 

 

 

 

 

 

Frequency I2C CLK

81.25

 

400

kHz

Transmit operation

High or low I2C CLK

Delay time after falling edge of I2C CLK

Hold time after falling edge of I2C CLK

1.2

 

µs

308

308-

ns

 

1230

 

0

 

ns

Receive operation

Frequency I2C CLK

 

400

kHz

High or low I2C CLK

1.2

 

µs

Delay time after falling edge of I2C

100

 

ns

CLK

 

 

 

Hold time after falling edge of I2C

0

 

ns

CLK

 

 

 

2.16 TX_ON - Burst Transmission

Pin

Signal

Dir

Description

 

 

 

 

35

TX_ON

O

GSM module to transmit

 

 

 

 

Burst transmission is the time when a GSM transceiver unit is transmitting RF signals. TX_ON indicates the module is going into transmission mode.

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LZT 123 7263 R1C

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Sony Ericsson GM47, GM48 manual External I 2C Serial Control Bus, Txon Burst Transmission