TJA1128 NO VCC output issues

[Kavin_Kumaravel]

Hello Team,

I am using TJA1128 in my control board, which is the primary source 5V for Micro. 

There is a failure with TJA, here are the info, could you let me know what could be the problem?

Note: LIN wake up is activated remote, I need to know why there is no 5V at VCC, and Reset is held LOW (may be under voltage at VCC)

PIN	Measured Output in V
Wake1	7.93
Wake2	7.93
BAT	13.36
LIN	12.68
GND
VCC	0
TXD/SDI	0
LIN_EN	0
RST	0
RXD	0
WWD	0

[Kavin_Kumaravel]

Any ideas?

[Kavin_Kumaravel]

Any ideas on this? 

[guoweisun]

Please share with the schematic!

[Kavin_Kumaravel]

Schematics

[guoweisun]

Seems the SBC  triggers the OVERTEMP mode.

[Kavin_Kumaravel]

Currently, these data I have added is tested at 25 deg cel.

[Kavin_Kumaravel]

Measured voltage added to the initial question

[guoweisun]

which data you added?

[Kavin_Kumaravel]

Factor to consider,

TJA in my control board were working continuously for 78hrs at ambient temp of 65 deg, it failed at this point of time.

Interesting part is 4 samples failed between 70-90 hrs of continuous running at the same environment with the same issues.

[guoweisun]

So do you mean after power on SBC no VCC output? or after your high temperature test lost the VCC?

do you try to change new SBC test again?

[Kavin_Kumaravel]

When tested at high temp, over temp could trigger TJA to reset. Now I am testing at room temperature, But TJA is not recovered. Can you explain why is that case? Is this problem with register, incase of how do i do factory reset?

[guoweisun]

Can you reproduce this issue with new SBC in your board?

[Kavin_Kumaravel]

No, at least not any time soon. Is it possible to do factory reset?

[guoweisun]

If so please read datasheet page18 -----6.3.4.2 Restoring factory preset values

[Kavin_Kumaravel]

I checked
All conditions passed, Vbat > Vth, LIN is held dominant and RSTN is low(0V) for more than 1 sec, but problem is RSTN is always LOW. I am assuming it means that SBC is not coming out of RESET loop?Any ideas why is that