MC33664 TPL data bits 0

[divyam]

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) ?

MC33664

[JozefKozon]

Hi Divyam,

please share your schematic with voltage levels and part values.

With Best Regards,

Jozef

[divyam · Accepted solution]

Hi Jozef,

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

The data bit stream is OK in that.

This thread can be closed.

[divyam]

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