Data Sheet TLE 7230 R

V2.0

Page

2005-10-05

6

Functional Description

The TLE 7230 R is an octal low-side power switch with a serial peripheral interface (SPI) for control and

diagnostic feedback of the 8 power DMOS switches. The power transistors are protected

load (current limitation), overtemperature and overvoltage (by active zener clamping). The diagnostic

logic recognizes a fault condition which can be read out via the serial diagnostic output (SO).

Output Stage Control: Parallel Control or SPI Control

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

grammed via SPI to switch the outputs according to the corresponding SPI command bit or to a combi-

nation of SPI bit and parallel input signal. The Boolean logic combination of parallel and serial signal is

programmable by SPI to logic "AND" or "OR". The respective SPI data bits are active high and the paral-

lel Inputs are active high or low 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 pos-

sible.

Map able parallel input (IN 4):

The parallel input 4 (IN4) can be defined via SPI command as parallel input for one or more power out-

puts. Depending on the Input Map Register this input can be used to control one up to eight of the paral-

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

Switching speed / Slew rate:

The switching speed / slew rate of each individual channel can be configured by SPI for slow or fast

switching speed (max. 15µs or 60µs).

Overtemperature Behavior:

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

As soon as an overtemperature event occurs, the channel is immediately turned off and the overtem-

perature information is reported by diagnosis. In this case, there are two different behaviors of the af-

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

• Auto restart: 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.

• Latching: In the event of an overtemperature shutdown, the channel stays off until the overtem-

perature latch is reset by a new L

àH transition of the input signal.

used in 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