Datasheet

21

Rev. 1.0, 2009-09-30

SPI Driver for Enhanced Relay Control

SPIDER - TLE7244SL

Serial Peripheral Interface (SPI)

Figure 11

Data Transfer in Daisy Chain Configuration

8.3

SPI Protocol

The SPI protocol of the SPIDER - TLE7244SL provides two registers. The input register and the diagnosis

register. The diagnosis register contains eight 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.

Note: If all channels are programmed to Standby, the device changes to power down status with minimum current

consumption (sleep mode).

SI

15

14

13

12

11

10

98

7654

321

0

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

Channel is 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