topic Re: MC33664 TPL data bits 0 in Power Management

MC33664 TPL data bits 0

divyam — Fri, 16 May 2025 07:04:05 GMT

Hi,

I'm trying to communicate to MC33771 AFE and while debugging i noticed that whatever I send on MOSI_TX, the TPL waveform bits are logic 0 only (attached waveform)

Also: -

1. Wakeup function is working properly. When TPL wakeup command is sent, VCOM changes from 0V to 5V
2. Waiting for 5msec after sending the wakeup command, before sending any command on SPI_TX
3. Trying to debug BCC_AssignCid(), whatever data is being sent on SPI_MOSI_TX, TPL shows 0 logic pulses only (corresponding to SPI RX waveform)

Right now i want to focus on the MC33664 transceiver only.
The transceiver should transmit the corresponding data on the bus, in both the cases (AFE present, AFE absent) ?

Re: MC33664 TPL data bits 0

JozefKozon — Fri, 16 May 2025 10:57:25 GMT

Hi Divyam,

please share your schematic with voltage levels and part values.

With Best Regards,

Jozef

Re: MC33664 TPL data bits 0

divyam — Fri, 16 May 2025 11:26:16 GMT

Hi Jozef,

Please find the info below:

VCC5 = 4.88V
VIO = 3.25V
RDTX+ = 2.51V (idle)
RDTX- = 2.49V (idle)

The waveform shown previously is b/w (RDTX+ and RDTX- after the signal transformer, on the AFE side)

MPN = MC33664ATL1EG

Re: MC33664 TPL data bits 0

divyam — Sun, 18 May 2025 05:52:09 GMT

Hi Jozef,

We tested the same on another hardware.
(Vio = 3.29V, VCC5 = 5.01V)

The data bit stream is OK in that.

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