TLE8108EM Datasheet, PDF (4/30 Pages) Infineon Technologies AG – Smart 8-Channel Low Side Relay Driver with SPI Interface

TLE 8108 EM
Smart 8-Channel Low Side Switch
Overview
Diagnostic Feedback Information
• Latched diagnostic information via SPI register
• Overtemperature detection (DOT)
• Overload detection corresponding Short Circuit to Battery (SCB) in ON state.
• Open load detection in OFF state (OL)
• Short Circuit to GND detection in OFF state (SCG)
Protection Functions
• Overload switch off
• Overtemperature switch off
• Electrostatic discharge (ESD)
Application
• Resistive, inductive and capacitive loads
• Especially designed for driving relays in automotive applications
General Information
The TLE8108EM is an 8-Channel Low Side Relay Switch designed for typical automotive relays, providing
embedded protective functions. The PG-SSOP-24 package is used to get a footprint optimized solution. The 16 bit
serial peripheral interface (SPI) is utilized for control and diagnosis of the device and the loads. The SPI interface
provides daisy chain capability.
The TLE8108EM is equipped with 4 input pins that can be used to directly control their dedicated channels thus
offering flexibility in design and PCB layout. The input multiplexer is controlled via SPI.
The device provides full diagnosis of the load, which is open load, short circuit to ground, as well as a short circuit
to battery detection. The SPI diagnosis bits indicate latched fault conditions that may have occurred.
Each output stage is protected against short circuit. In case of Overload, the affected channel switches off. There
are temperature sensors for each channel to protect the device in case of Overtemperature.
The device is supplied by a single power supply. It is operating at 5V nominal value.
The internal switches are power n-MOSFETs. The inputs are ground referenced CMOS compatible. The device
is monolithically integrated in Smart Power Technology.
All output pins are available at one side of the device while the other side bundles the signals to the microcontroller,
thus facilitating the PCB layout.
It is possible to set each channel in a Clear Mode (CLR) in order to clear Diagnosis flags; in CLR state output is
switched off and diagnosis currents are disabled.
A Standby mode of the Device (STB) can be entered if all the channels are set into CLR state; in STB mode the
power consumpiton is reduced to the minimum.
Data Sheet
4
Rev. 1.0, 2011-03-23