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PSoC 4 MCU

mili_2550941
New Contributor

Dear All:

     We have a problem when use PSOC 4014: voltage of BAT is decreased from 12V to 0 slowly(0.5V/Min), then incleased from 0 to 12V, 4014 can't reset reliably. The scematic is as below: Can you give us some suggestion?

4014.png

Below is test requirement:

test.png

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1 Solution
NoriakiT_91
Employee

4014 has a specification "Power supply slew rate" at the VDD input as follows.

GS004775.png

At first, please ensure if the VDDD voltage in your system satisfies this specification.

If NOT, it is recommend to add a power-on-reset circuit to the BAT line to control the 3.3V regulator.

Regards,

Noriaki

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3 Replies
LinglingG_46
Moderator
Moderator

你能描述一下你具体的测试流程吗?

你在上面描述的不能可靠的复位,这一点你是通过什么判断的?

找到是什么原因导致的,才可以给出建议。

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mili_2550941
New Contributor

就是我电路图里面的BAT(J4.PIN 1)供电电压从12V按照0.5V/分钟的速度缓慢下降到0V,再从0V已同样速度缓慢上升到12V,此时4014不能可靠复位(通过检测4014输出,判断触摸按键无功能)。请帮忙分析一下。

谢谢!

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NoriakiT_91
Employee

4014 has a specification "Power supply slew rate" at the VDD input as follows.

GS004775.png

At first, please ensure if the VDDD voltage in your system satisfies this specification.

If NOT, it is recommend to add a power-on-reset circuit to the BAT line to control the 3.3V regulator.

Regards,

Noriaki

View solution in original post