TLE7230R_09 Datasheet, PDF (6/15 Pages) Infineon Technologies AG – Smart Octal Low-Side Switch Features Low Quiescent Current< 10μA

Data Sheet TLE 7230R
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 protected⁴ against
overload (current limitation), overtemperature and overvoltage (by active zener clamping). The diag-
nostic 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 com-
bination 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
parallel 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
possible.
parallel in serial in
off
off
off
on
on
off
on
on
Output "OR"
off
on
on
on
Output "AND"
off
off
off
on
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
outputs. Depending on the Input Map Register this input can be used to control one up to eight of the
parallel outputs. Default operation: IN4 is the parallel input for channel 4.
Input buffer
IN n (1..3)
Input buffer
IN 4
Input Map register
&
≥1
Boolean register
Input buffer
IN 4
Output Latch
Boolean register
&
≥1
Output Latch
serial controll register
Channel 1 to 3
serial controll register
Channel 4 to 8
Input Map register
Signal logic channel 1 to 3
Signal logic channel 4 to 8
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
affected 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 LàH transition of the input signal.
4 _{The integrated protection functions help to prevent damage to the device under fault conditions and may not be}
used in normal operation or permanently.
V3.4
Page 6
2009-07-15