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标题: 英飞凌电源管理PMIC的安全应用 [打印本页]

作者: 刘俊凯 时间: 2024-8-5 20:51
标题: 英飞凌电源管理PMIC的安全应用
择要
  本篇文档紧张用来介绍英飞凌电源管理芯片TLF35584的使用，基于电动助力转向应用来介绍。包罗一些安全机制的实行。
  TLF35584介绍
  TLF35584是英飞凌推出的针对车辆安全应用的电源管理芯片，符合ASIL D安全等级要求，具有高效多电源输出通道，宽电压输入范围,根据差别的型号有3.3V和5.0V两种命名。可以为MCU提供600mA的电源，可以提供200mA的电源给通信，还可以提供正确的参考电压给ADC使用，具有SPI通信，可以监控和设置该芯片。我们以TLF35584QVVS2型号的使用来做介绍。TLF35584的封装类型以及电压分类如下表所示：

TLF35584系统框图

管脚介绍

Pin	Symbol	Function
1	BSG	Boost driver ground: Connect this pin to ground at the low side of an external current sense resistor to decouple the driver noise from the sensitive ground. If step up pre regulator option is not used, connect to ground.
2	VST	Supply voltage standby regulator, input: Connect this input to supply (battery) voltage with reverse protection diode and capacitor between pin and ground. An EMC filter is recommended.
3	ENA	Enable Input: A positive edge signal at this pin will wake the device. In case of not used connect to ground.
4	WAK	Wake/Inhibit Input: A high level signal of defined length at this pin will wake the device. In case of not used, connect to ground
5	QST	Output standby LDO: Connect a capacitor as close as possible to pin.
6	AG1	Analogue ground, pin 1: Connect this pin directly (low ohmic and low inductive) to ground.
7	AG2	Analogue ground, pin 2: Connect this pin directly (low ohmic and low inductive) to ground.
8	AGS1	Analogue ground, safety, pin 1: Connect this pin directly (low ohmic and low inductive) to ground. In case a safety switch is used, connect directly to the source of the NMOS used.
9	AGS2	Analogue ground, safety, pin 2: Connect this pin directly (low ohmic and low inductive) to ground. In case a safety switch is used, connect directly to the source of the NMOS used.
10	SS2	Safe state signal 2: Safe state output signal 2, sets the application into a safe state. Signal is delayed against SS1, delay can be adjusted via SPI command.
11	SS1	Safe state signal 1: Safe state output signal 1, sets the application into a safe state.
12	SDI	Serial peripheral interface, signal data input: SPI signalling port, connect to SPI port “data output” of micro processor to receive commands during SPI communication.
13	SDO	Serial peripheral interface, signal data output: SPI signalling port, connect to SPI port “data input” of micro processor to send status information during SPI communication.
14	SCL	Serial peripheral interface, signal clock: SPI signalling port, connect to SPI port “clock” of micro processor to clock the device for SPI communication.
15	SCS	Serial peripheral interface, signal chip select: SPI signalling port, connect to SPI port “chip select” of micro processor to address the device for SPI communication.
16	WDI	Watchdog input, trigger signal: Input for trigger signal, connect the “trigger signal output” of the micro processor to this pin. In case of not used, leave open (internal pull-down).
17	ROT	Reset output: Open drain structure with internal pull-up current source. A low signal at this pin indicates a reset event.
18	INT	Interrupt signal: Push-pull-stage. A low pulse at this pin indicates an interrupt, the micro processor shall read out the SPI status registers. Connect to a non maskable interrupt port (NMI) of the micro processor core supply volt

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