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：
https://i-blog.csdnimg.cn/blog_migrate/9a94f9f61da6d7f32a13d2883d24aea4.png
TLF35584系统框图
https://i-blog.csdnimg.cn/blog_migrate/bfce7b6ee729dc148c93e26fe20af6bb.png
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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