STE2007 datasheet(21/62 Pages) STMICROELECTRONICS

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STE2007

4 INTERFACE

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If a new command identifier is transferred after a pause condition the previous communication

session is definitively closed.

Four are the possible conditions:

–

Command-Pause-Command

–

Command-Pause-Parameter

–

Parameter-Pause-Command

–

Parameter-Pause-Parameter

Figure 13. 4-lines SPI Data Transfer Pause

4.2.2

Driver TxData Mode (Read Mode)

Throughout SDA line is possible to read some registers value (ID Numbers, Status byte,

temperature).

SDA (output Driver) is in High impedance in steady state and during data write.

Figure 14. 4-lines SPI 8Bit Read Cycle

4.3

I2C Bus

The I2C interface is a fully complying I2C bus specification, selectable to work in both Fast

(400kHz Clock) and High Speed Mode (3.4MHz).

This bus is intended for communication between different ICs. It consists of two lines: one bi-

directional for data signals (SDA) and one for clock signals (SCL). Both the SDA and SCL lines

must be connected to a positive supply voltage via an active or passive pull-up.

The following protocol has been defined:

LR0191

D/!C

!CS

SDA

SCL

COMMAND/PARAMETER

Pause

LR0255

!CS

SCL

Read Command

DATA

SDA

(Input)

SDA

(Output)

High Z

MCU Data Tx Start

LCD Driver Data Tx Start

Next Command

D!C

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