66AK2G12: Problem in high temperature operation

K.Z

Expert 2590 points

Part Number: 66AK2G12

Tool/software:

Hi All,

This is a continuation of this thread.

66AK2G12: Problem in high temperature operation - Processors forum - Processors - TI E2E support forums

The customer has cross-checked the samples and will describe the defects.

Sample 1:
・When the ambient temperature of the device rises above 50°C, the device repeatedly resets and recovers.
・The device generates about 5°C more heat than a good device.
・When the ambient temperature exceeds 50°C, the Y2 pin (RESET START) signal is suddenly output.
・Y2 pin is used as watchdog reset and is connected to AA3 pin (POR).
・The above occurs repeatedly, so reset and recovery are repeated.
・When the temperature drops, the reset will occur spontaneously.

Sample 2:
・When the ambient temperature of the device rises above 50°C, the device stops completely.
・The signal of Y2 pin (RESET START) is not output and not input to AA3 pin.
・The device does not recover even if the temperature drops, and recovers when the power is turned on again.

Both have been cross-checked.
The samples was replaced on a normally operating board (operated normally for 1 week at approx. 50°C),
The above contents were reproduced. Reproduced within 30 minutes at approx. 50°C environment.

We are planning to measure Y2 pin and AA3 pin,
Are there any other pins we should measure?

Also, please let us know if there are any expected causes.

Best Regards,

Ito

9 months ago

0 PaulM 9 months ago

TI__Mastermind 28215 points

Ito

As mentioned in the other thread, I am not aware of any other cases like this.

I will check to see if there are any other pins that should be monitored.

--Paul

+1 PaulM 8 months ago in reply to PaulM

TI__Mastermind 28215 points

For the sample 1 scenario, you can look at the following registers to determine what was the cause of the reset:

RSTYPE - TRM section 5.4.5.4.13
BOOTCFG_RESET_STAT - TRM Section 5.1.4.21
BOOTCFG_LRSTNMISTAT - TRM Section 5.1.4.22

K.Z said:
・Y2 pin is used as watchdog reset and is connected to AA3 pin (POR).

I am not sure it is valid to connect RESETSTAT to POR. From what I see in the datasheet, RESETSTAT is a function of PORz..having them connected may impact the ability to determine the source of the reset.

You can also look at the output clocks to see if the is activity:

OBSCLK_N(1) Observation clock output, negative O L1
OBSCLK_P(1) Observation clock output, positive O K1
OBSPLL_LOCK(1) Observation PLL lock output OZ N5

--Paul