Data Sheet

21

Rev. 1.1, 2009-04-15

SPI Driver for Enhanced Relay Control

SPIDER - TLE 7240SL

Serial Peripheral Interface (SPI)

Figure 11

Data Transfer in Daisy Chain Configuration

8.3

SPI Protocol

The SPI protocol of the SPIDER - TLE 7240SL provides two registers. The input register and the diagnosis

register. The diagnosis register contains four pairs of diagnosis flags, the input register contains the input

multiplexer configuration. After power-on reset, all register bits are set to 1 and the device is in idle mode.

If all channels are in Standby Mode, the device is in power down status with minimum current consumption (sleep

mode).

SI

15

14

13

12

11

10

9

876

543

210

IN8

IN7

IN6

IN5

IN4

IN3

IN2

IN1

Field

Bits

Type

Description

INn

(n = 8 - 1)

15:14,

13:12,

11:10,

9:8,

7:6,

5:4,

3:2,

1:0

W

Input Register Channel n

Fast channel switched off.

Diagnosis flags are cleared.

Diagnosis current is disabled.

Channel is switched according to signal at input pin.

Diagnosis current is enabled in OFF-state.

Channel is switched on.

Channel is switched off.

Diagnosis current is enabled.

MI

MO

MCS

MCLK

SI device 3

SI device 2

SI device 1

SO device 3

SO device 2

SO device 1

time

SPI_DasyChain2.emf