充电泵的工作原理与占空比:
StartX引脚的信号要求:
多芯片应用中的Vboost连接:
外部VCCP供电的具体要求:
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Dear Junyao,
The working principle and duty cycle of the charge pump :
[A] The meaning of the charge pump 100% duty cycle, means, that the charge pump is capable to work with 100% duty cycle. It doesn't mean, that it will work with 100% duty cycle. The actual duty cycle depends on your configuration.
Signal requirements for the StartX pin :
[A] Unfortunately we cannot support you for the Aurix MCUs even if we want to. We do not have access to Infineon's documents. For recommended connection of the START1 through START7 pins, you can refer to our KITPT2000FRDM6C + to FRDM-KL25Z MCU board.
Please refer to the KITPT200FRDM6C User Guide.
Vboost connections in multi-chip applications :
[A] The Vboost capabilities are defined for only one PT2000 connected. If more, than one PT2000 is connected, then you need to connect Vboost for each PT2000 separately.
Specific requirements for external VCCP power supply :
[A] Yes, the external voltage applied to the VCCP pin must be 7V. Please refer to the note 2. and to section 6.1.4.2 in the MC33PT2000 datasheet.
With Best Regards,
Jozef
关于startx引脚信号要求,接到aurix的gpio还是gtm。应该要接gtm的atom,只有这样才能使用atom的定时中断功能,实现6缸的时序以及脉冲长度(即喷油时长)控制,普通gpio无非实现的。此处我已经使用tc3xx实现。start的拉低时间即为一个喷油peak,hold等整个喷油周期的时间。
Dear Junyao,
The working principle and duty cycle of the charge pump :
[A] The meaning of the charge pump 100% duty cycle, means, that the charge pump is capable to work with 100% duty cycle. It doesn't mean, that it will work with 100% duty cycle. The actual duty cycle depends on your configuration.
Signal requirements for the StartX pin :
[A] Unfortunately we cannot support you for the Aurix MCUs even if we want to. We do not have access to Infineon's documents. For recommended connection of the START1 through START7 pins, you can refer to our KITPT2000FRDM6C + to FRDM-KL25Z MCU board.
Please refer to the KITPT200FRDM6C User Guide.
Vboost connections in multi-chip applications :
[A] The Vboost capabilities are defined for only one PT2000 connected. If more, than one PT2000 is connected, then you need to connect Vboost for each PT2000 separately.
Specific requirements for external VCCP power supply :
[A] Yes, the external voltage applied to the VCCP pin must be 7V. Please refer to the note 2. and to section 6.1.4.2 in the MC33PT2000 datasheet.
With Best Regards,
Jozef
"Okay, thank you very much for your help with my project. Perhaps my second question was a bit too abstract, as you might be missing some relevant information. However, I'd still like to ask one more thing - does the STARTX pin simply require a sustained high level for a certain duration to operate? Can this be achieved with just a CMOS high level output from GPIO, or is it necessary to use PWM?"
Dear Junyao,
the STARTx pins require sustained voltage level, no PWM is needed. But you will need an MCU to set the STARTx pins as inputs. Please see the description from an application engineer to another customer with similar question.
DESCRIPTION
If the MCU is connected to the kit then the MCU by default will drive the STARTx pin. If customer want to force them at 5V meaning that they drive them externally without an MCU then they need to have the MCU set as inputs pin to avoid a "fight"between MCU and their external equipment.
With Best Regards,
Jozef