TLE7824G Datasheet, PDF (29/53 Pages) Infineon Technologies AG – Integrated double low-side switch, high-side/LED driver, hall supply, wake-up inputs and LIN communication with embedded MCU (24kB Flash)

TLE7824G
Low Side Switches
11
Low Side Switches
The low side switches LS1 and LS2 have been designed to drive relays, e.g. in window lift applications. The
continuous output current is dimensioned for 300mA (each) maximum. In SBC Active and LIN Receive-Only mode
the low side outputs can be switched on and off, respectively via an SPI input bit. Protection against overcurrent,
overtemperature and overvoltage conditions is integrated in the low-side drivers.
In case of a load current that is exceeding the overcurrent threshold both drivers are switched-off after a filter time.
A thermal protection circuit is included as well, and is switching-off the drivers in case the overtemperature
threshold is reached. In both cases the SPI diagnostic information is updated accordingly and the ERR
interconnect is pulled “low” for one internal cycle (see “SBC Oscillator” on Page 37). The drivers have to be
re-activated via SPI command. An overvoltage protection has been implemented by active clamping for inductive
loads preventing the occurrence of voltage peaks.
Moreover the switches are automatically disabled when a reset or watchdog reset occurs. However, the switches
are not automatically switched off in case of an overvoltage condition, e.g. load dump. If a double-failure occurs
at the same time causing an overcurrent (OC) or overtemperature (OT) condition, than the LSx are turned off in
order to protect the IC.
Note: In case one LSx is turned off due to an OC / OT condition the second LSx is turned off automatically (bi-
directional ERR interconnect pulled “low”).
The LSx can also be switched off by the microcontroller by pulling the bi-directional ERR interconnect “low” for at
least one internal cycle (see “SBC Oscillator” on Page 37).
Data Sheet
29
Rev. 3.01, 2008-04-15