Infineon公司的TLE9845是汽車嵌入電源系統級芯片(SoC),集成了ARM? Cortex?-M0 MCU,繼電器驅動器,高邊開關,LIN收發器和工作于汽車電池的電源系統;它的外設包括有用來檢測高壓和低壓輸入與檢測電池電壓和設備電源的13個復用的模擬輸入的10位ADC,用來檢測電壓和溫度的7個復用輸入的8位ADC,數字外設包括PWM信號發生器單元和16位計時器,主要用在窗戶提升,汽車天窗,雨刷,風扇馬達控制,泵馬達控制,LIN尋址繼電器馬達應用.本文介紹了TLE9845主要特性,框圖,以及TLE9845QX應用板框圖,主要特性,電路圖和PCB設計圖.

The TLE984x product family integrates an ARM? Cortex?-M0 microcontroller core along with relay drivers, high-side switches, LIN transceiver and a power supply system that enables the device to operate at the vehicle battery level.

Its peripheral set includes a 10-bit ADC with 13 multiplexed analog inputs to process up to 5 high-voltage monitoring Inputs, 6 low-voltage inputs and 2 high-voltage inputs for sensing the battery voltage and the supply of the device. It further includes an 8-bit ADC with 7 multiplexed inputs for voltage and temperature supervision. Its digital peripherals include a PWM signal generator unit and 16-bit timers along with a number of general purpose I/Os (serial interfaces and UARTs). It includes an on-chip linear voltage regulator to supply external loads.

The TLE984x family concept offers scalability in terms of flash memory sizes ranging from 36 kB to 64 kB with pin-compatible devices. The product family is offered in a leadless VQFN-48 package to save board space.

The TLE984x family is the successor of the TLE983x family and is specifically designed to drive a wide range of LIN-slave automotive motor control applications via a relay or via a PN MOSFET half-bridge.

TLE9845主要特性:

ARM? Cortex?-M0 MCU
System clock up to 40 MHz
Up to 64 kB flash memory
Up to 4 kB RAM
High-side & low-side switches with PWM capability
5 V power supply output
Integrated LIN transceiver compatible with LIN standard 2.2 and SAE J2602-supports fast programming via LIN
8-bit ADC with 7 channels for voltage and temperature supervision
10-bit ADC with 13 channels (6 analog Inputs, 5 HV monitor inputs and battery sense)
On chip oscillator & PLL

TLE9845主要優勢:

Complete system-on-chip
Minimum number of external components reduces BOM cost
VQFN package with 7 x 7 mm2 footprint enables PCB space saving

TLE9845應用:

Window lift
Sunroof
Wiper
Fan/blower motor control
Pump motor control
LIN addressed relay motor applications

圖1. TLE9845框圖(窗戶提升案例)
TLE9845應用板

圖2.帶低邊N-MOSFET的TLE9845QX應用板外形圖

The TLE9845_APPKIT_N is designed to evaluate hardware and software functionalities of theTLE9845QX in an application similar designed shape. The n-channel MOSFET is placed as a Low Side Switch. Apassive freewheeling diode is placed to drive DC motors unidirektionally.
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圖3.NTLE9845QX應用板框圖

The TLE9845_App_Kit_N provides an application near circuit to evaluate unidirectional DC motors. Thelowside MOSFET with passive power diode can be used to evaluate motor connected to battery applications.

The TLE9845QX device is placed underneath the DC-link capacitor. The board is protected against reversepolarity of input voltage supply.

The N-channel MOSFET is connected to the integrated highside and lowside switches of the TLE9845QXDevice.

In addition a lowside current sense resistor is placed with an external operational amplifier.It is connected to the ADC1 .

The Application Kit provides a breakable On-Board debugger. It provides a SWD-Debug connection and avirtual COM port for serial UART communication.

Power supply and motor connectors are accessable via plated through hole contacts, which can be used toplace M2.5 pressnuts (optionally).

TLE9845QX應用板主要特性:

? Application near circuit (Motor connected to Battery)
? Overcurrent Protection (external lowside Shunt)
? Drain-Source-Monitoring (Differential Unit)
? USB-Communication and Debug-Interface (USB-Connector)
? Demo-Application Code and Graphical User Interface (GUI)
? LIN-PWM Example Code (PWM Genrator with GUI)

圖4.帶低邊N-MOSFET和調試接口的TLE9845QX應用板電路圖

圖5.帶低邊N-MOSFET的TLE9845QX應用板 PCB設計圖(頂層)

圖6.帶低邊N-MOSFET的TLE9845QX應用板 PCB設計圖(底層)