TLE6214L_04 Datasheet, PDF (6/22 Pages) Infineon Technologies AG – Smart Dual Current Sense Switch

Datasheet TLE 6214 L
Functional Description
The TLE 6214 L is a dual-low-side power switch which has two parallel inputs to control the 2
power DMOS switches, as well as by an 8-Bit SPI for control and diagnostic feedback. The
power transistors are protected¹⁾ against short circuit, overload (current limitation), overtem-
perature and against overvoltage by an active zener clamp. The IC has a load current propor-
tional current output for current control applications.
The diagnostic logic recognises a fault condition which can be read out via the SPI or the par-
allel status outputs (depending on the IC configuration).
Output Stage Control: Parallel Control or SPI Control
The Output stages can be controlled by parallel Inputs or
IN 1,2
by SPI command. The IC can be programmed (by SPI) to
switch the outputs according to the parallel input signal, to
the corresponding SPI command bit or to a combination of
these two signals.
Both, parallel inputs and respective SPI databits are high
AND
active.
Output
Driver
Truth table for Output control
Input control sig-
Output Channel n
nal Channel n
parallel SPI
parallel serial logic
Input
Bit
control control OR
0
0
off
off
off
0
1
off
on
on
1
0
on
off
on
1
1
on
on
on
logic
AND
off
off
off
on
OR
Serial Input bits
command „channels on / off“
Each output is independently controlled by an output latch. A logic high input ‘data bit’ turns the respec-
tive output channel ON, a logic low ‘data bit’ turns it OFF.
Switching speed / Slew rate:
The switching speed / slew rate of both channels can be configured by SPI for slow or fast switching
speed (1:5) for each channel individually.
Overtemperature Behaviour:
Each channel has an overtemperature sensor and is individually protected against overtemperature.
As soon as overtemperature occurs the channel is immediately turned off (without fault filtering time)
and the overtmperature information is reported by diagnosis. In this case there are two different behav-
iours of the affected channel that can be selected by SPI (for all channels generally).
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.
Latching: After overtemperature shutdown the channel stays off until the overtemperature latch is re-
set by a new L!H transition of the input signal.
Note: The overtemperature sensors of the output channels are only active if the channel is turned on.
As soon as the IC temperature (Temperature of the whole IC) reaches a specified level an overtem-
perature warning will be indicated.
Low Quiescent current mode (Sleep mode) : By SPI Command the device can be set to Sleep
mode. In this mode all outputs are turned off, the diagnosis and biasing is disabled, the diagnosis and
1 _{)The integrated protection functions prevent an IC destruction under fault conditions and may not be used in}
normal operation or permanently.
V3.0
Page 6
18.10.2004