Datasheet TLE 6236 G

V2.1

Page

26.Aug. 2002

7

Functional Description

The TLE 6236 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 tran-

by an active zener clamp.

The diagnostic logic recognizes a fault condition which can be read out via the serial diagnos-

tic output (SO).

Circuit Description

Output Stage Control

Each output is independently controlled by an output latch and a common reset line, which

disables all eight outputs. Serial data input (SI) is read on the falling edge of the serial clock. A

logic high input data bit turns the respective output channel ON, a logic low data bit turns it

Special conditions for Channel 1 to 4:

In addition to the serial control of the outputs it is possible to control channel 1 to channel 4

directly in parallel for PWM applications. These inputs are high active and ORed with the SPI

control bit. The parallel inputs are provided with internal pull down sources, to guarantee that

the channels are switched off when the inputs are not connected.

The table shows the OR-operation of the parallel inputs 1 ..4 and the corresponding SPI bits.

The outputs 5 .. 8 can be controlled in serial via SPI

Interface

Serial Control Bits (SI)

Ch. 8

Ch. 7

Ch. 6

Ch. 5

Ch. 4

Ch. 3

Ch. 2

Ch. 1

765

432

1

0

MSB

LSB

Serial Diagnostic Bits (SO)

DIAG7 DIAG6 DIAG5 DIAG4 DIAG3 DIAG2 DIAG1 DIAG0

765

432

1

0

MSB

LSB

IN 1 - 4

SPI-Bit 0 - 3

OUT 1 - 4

00

OFF

01

ON

10

ON

11

ON

SPI-Bit 4 - 7 OUT 5 - 8

0OFF

1ON