LPC MicrocontrollersのトピックRe: LCP540 to LPC546 - Pin compatibility

LCP540 to LPC546 - Pin compatibility

jana_beck — Thu, 21 May 2020 19:28:59 GMT

Hello,
according to the NXP website LPC540 and LPC546 are pin compatible. I also checked the pin mapping.

I got the MCU professionally reworked from LPC540 to LPC546.
My PCB is not working properly anymore now.

1. I can not talk to the MCU any more. The IDE cannot discover a target.
2. The power nets seem to be damaged. I can measure VCC vs GND as 3.3V. Some other nets that are connected to the MCU are on 0.9V, which they were not before.

Test:
1. Visual inspection: No obvious shorted nets.
2. Electrical tests: An external power supply draws 40 mA, which seems to be correct for the PCB.

3. A multi-meter indicates that there is a short between GND and VCC pins of the MCU.

My main question is: Is LPC540 and LPC546 truly compatible? That is, can I just switch them out on a PCB?

Thanks,
Jana

Re: LCP540 to LPC546 - Pin compatibility

ZhangJennie — Fri, 22 May 2020 02:00:27 GMT

Hi Jana,

To resolve your issue, we need to know your part number of LPC540xx and 546xx. I will check.

Best Regards

Jennie

Re: LCP540 to LPC546 - Pin compatibility

jana_beck — Fri, 22 May 2020 03:25:00 GMT

Hi Jennie,
before: LPC54016JBD100E
now: LPC54606J512BD100E

Thanks,
Jana

Re: LCP540 to LPC546 - Pin compatibility

ZhangJennie — Tue, 26 May 2020 03:33:18 GMT

Yes, by checking, this two parts are pin to pin compatible.