topic Re: PF3000 : SNVS,SW-Reg overcurrent behavior in i.MX Processors

PF3000 : SNVS,SW-Reg overcurrent behavior

kanoumamoru — Tue, 06 Dec 2016 06:16:29 GMT

Hi, community.

PF3000 has some LDOs and SW-Regs.

Each regulators have over current detector or limiter.

But we can't find the description about Current limit protection behavior
for SNVS and SW regulator in the data sheet.

Q1) Are there current limiter for SNVS ?

Q2) Are there current limiter for switching regulator (i.e. SW1A/1B, SW2, SW3) ?

Best Regards,

kanou

Re: PF3000 : SNVS,SW-Reg overcurrent behavior

RossMcLuckie — Tue, 06 Dec 2016 14:38:54 GMT

Hi Kanou,

The SNVS LDO is only capable of 1mA maximum, so current limiting doesn't make much sense at those levels, it is also intended as an always on supply, so if something goes wrong there your whole system is likely to fail, should only be connected to the iMX etc, so the likelihood of failing should be minimal.

The SW's do have current limiting and can generate interrupts if tripped, see the control registers in the datasheet -

Regards

Ross

Re: PF3000 : SNVS,SW-Reg overcurrent behavior

art — Wed, 21 Dec 2016 10:55:53 GMT

1. The SNVS LDO doesn't have the current limiting function since this is very low-power LDO primarily meant to backup the RTC and SNVS logic of a processor in power-off mode.

2. The switching regulators have the current limiting function, refer to the part's documentation.

Have a great day,
Artur