Target Datasheet TLE7230 R/G

V1.1

Page

12. Oct. 2003

7

Functional Description

The TLE 7230 R/G is an octal-low-side power switch which provides a serial peripheral interface (SPI)

to control the 8 power DMOS switches, as well as diagnostic feedback. The power transistors are pro-

zener clamp. The diagnostic logic recognizes a fault condition which can be read out via the serial di-

agnostic output (SO).

Output Stage Control: Parallel Control or SPI Control

The Output stages can be controlled by parallel Inputs or by SPI command. The IC can be pro-

grammed (by SPI) to switch the outputs according to the corresponding SPI command bit or to a com-

bination of SPI bit and parallel input signal. The logic combination of parallel and serial signal is pro-

grammable by SPI (Boolean operation) to logic "AND" or "OR" The respective SPI databits are high

active, the parallel Inputs are high or low active according to the PRG pin (see pin description).

Boolean operation:

The logic combination of the parallel and the

serial input signal can be configured by an

SPI command for each of the 8 channels

individually. Logic "AND" or logic "OR" is

possible.

Mappable parallel input (IN 4):

By SPI Command the parallel input 4 (IN4 or IN) can be defined as parallel input for one or more power

outputs. Depending on the Input Map Register this input can be used to controll one up to eight of the

parallel outputs. Default operation: IN4 / IN is the parallel input for channel 4.

Switching speed / Slew rate:

The switching speed / slew rate of all 8 channels can be configured by SPI for slow or fast switching

speed (1:5) for each channel individually.

Overtemperature Behavior:

Each channel has an overtemperature sensor and is individually protected against overtemperature.

As soon as overtemperature occurs the channel is immediately turned off and the overtmperature in-

formation is reported by diagnosis. In this case there are two different behaviours of the affected chan-

nel that can be selected by SPI (for all channels individually).

Autorestart: as long as the input signal of the channel remains on (e.g. parallel input high) the channel

turns automatically on again after cooling down.

normal operation or permanently.

parallel in serial in

Output "OR"

Output "AND"

off

off

off

off

off

on

on

off

on

off

on

off

on

on

on

on

&

≥1

serial controll register

Channel 1 to 3

Input buffer

IN 4

Input buffer

IN n (1..3)

Output Latch

Input Map register

Boolean register

&

≥1

serial controll register

Channel 4 to 8

Input buffer

IN 4

Output Latch

Input Map register

Boolean register

Signal logic channel 1 to 3

Signal logic channel 4 to 8