Infineon's TLE9845QX family is a relay driver chip that integrates a 32-bit ARM® Cortex® M0 core with an MCU operating at up to 40MHz. The device integrates a relay or PN MOSFET half-bridge to detect, control and start the motor on a single chip. All the functions required, including 48KB flash memory, 4KB EEPROM, 768B 100TP memory, 4KB RAM and boot ROM, are highly integrated and cost-effective. They are mainly used in automotive motor control applications such as window regulators, wipers, car sunroof, Fans and fans, etc. This article introduces the main features of TLE9845QX, block diagram, power management unit block diagram, system control unit - digital block diagram and Cortex-M0 block diagram, and TLE984x evaluation board main features, block diagram, circuit diagram, bill of materials, PCB component layout And design drawings.
For a system and interface control anembedded 32-Bit Cortex-M0 microcontroller is included. For internal and external power supply purposes, on-chiplow drop-out regulators are existent. An internal oscillator (no External components necessary) provides a costeffecTIve and suitable clock in parTIcular for LIN slave nodes. As communicaTIon interface, a LIN transceiver andseveral High Voltage Monitor Inputs with adjustable threshold and filters are available. further two High-Sides Switches (eg for driving LEDs or powering Of switches), two low-side switches (eg for relays) and several general purpose input/outputs (GPIO) with pulse-width modulation (PWM) capabilities are available.
The Micro Controller Unit supervision and system protection including reset feature is controlled by aprogrammable window watchdog. A cyclic wake-up circuit, supply voltage supervision and integrated temperaturesensors are available on-chip.
All relevant modules offer power saving modes in order to support terminal 30 connected automotive applications.
A wake-up from the power saving mode is possible via a LIN bus message, via the monitoring inputs or repetitive with a programmable time period (cyclic wake-up).
The integrated circuit is available in a package with 0.5 mm pitch and is designed to withstand the challenging conditions of automotive applications.
The TLE9845QX has several operational modes mainly to support low power consumption requirements.
Main features of TLE9845QX:
• 32-bit ARM Cortex-M0 Core
– up to 40 MHz clock frequency
– one clock per machine cycle architecture
– single cycle multiplier
• On-chip memory
– 48 KB Flash (including EEPROM)
– 4 KB EEPROM (emulated in Flash)
– 768 bytes 100 Time Programmable Memory (100TP)
– 4 KB RAM
– Boot ROM for startup firmware and Flash routines
• On-chip OSC
• 2 Low-Side Switches incl. PWM functionality, can be used eg as relay driver
• 2 High-Side Switches with cyclic sense option and PWM functionality, eg for main LEDs or switch panels (min. 150 mA)
• 5 High Voltage Monitor Input pins for wake-up and with cyclic sense with analog measurement option
• 10 General-purpose I/O Ports (GPIO)
• 6 Analog input Ports
• 10-Bit A/D Converter with 6 model inputs + VBAT_SENSE + VS + 5 high voltage monitoring inputs
• 8-Bit A/D Converter with 7 inputs for voltage and temperature supervision
• Measurement unit with 12 channels together with the onboard 10-Bit A/D converter and data post processing
• 16-Bit timers - GPT12, Timer 2 and Timer 21
• Capture/compare unit for PWM signal generation (CCU6)
• 2 full duplex serial interfaces (UART1, UART2), UART1 with LIN support
• 2 synchronous serial channels (SSC1, SSC2)
• Usage as P/N-channel Power MOSFET driver (Half Bridge Application) supported by four additional differentialchannels in ADC1
• On-chip debug support via 2-wire SWD
• LIN Bootstrap loader to program the Flash via LIN (LIN BSL)
• 1 LIN 2.2 transceiver
• Single power supply from 3.0 V to 28 V
• Low-dropout voltage regulators (LDO)
• 5 V voltage supply VDDEXT for external loads (eg Hall-sensor)
• Core logic supply at 1.5 V
• Programmable window watchdog (WDT1) with independent on-chip clock source
• Power saving modes:
– Micro Controller Unit slow-down mode
– Sleep Mode with cyclic sense option
– Cyclic wake-up during Sleep Mode
– Stop Mode with cyclic sense option
• Power-on and undervoltage/brownout reset generator
• Overtemperature protection
• Short circuit protection for all voltage regulators and actuators (High Side, Low Side)
• Loss of clock detection with fail safe mode for power switches
• Temperature Range TJ: -40 °C up to 150 °C
• Package VQFN-48-31 with LTI feature
• Green package (RoHS compliant)
• AEC Qualified
Figure 1. TLE9845QX block diagram
Figure 2. TLE9845QX Power Management Unit Block Diagram
Figure 3. TLE9845QX System Control Unit - Digital Block Diagram
Figure 4. TLE9845QX Cortex-M0 block diagram
TLE984x Evaluation Board
The TLE984x Evaluation Board offers complete evaluation of all functions and peripherals of the TLE984x product family. This board is designed to provide a fast and easy start of evaluation, for Infineons embedded Power TLE984xdevice family.
The TLE984x device is placed in the center of the PCB. A socket provides the possibility to test and evaluate all ICsout of the TLE984x device family. Every pin of the IC is connectable via rows of pinheader. The board is protectedagainst reverse polarity of input voltage In addition to that, a scew-connector is placed near the relay to contact and drive a DCmotor(example: window lift motor).
The evaluation board provides an on board debugger. It is placed in the upper left of Figure 1. It provides a SWDDebugconnection and a virtual COM port for serial UART communication.
Highside and Lowside switches and VDDEXT are connectable via 4mm standard laboratory wires.
The High-Voltage-Monitor pins can be triggered with dedicated pushbuttons.
For analog input values ​​a potentiometer is connected to PIN P2.2.
The LIN connection is able to be configured to master and slave mode.
Figure 5. Outline drawing of the TLE984x evaluation board
Figure 6. TLE984x Evaluation Board Block Diagram
Figure 7. TLE984x Evaluation Board Circuit Diagram (1)
Figure 8. TLE984x Evaluation Board Circuit Diagram (2)
TLE984x evaluation board bill of materials:
Figure 9. TLE984x evaluation board PCB component layout
Figure 10. TLE984x Evaluation Board PCB Layout
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