TPS65313-Q1: MCU Error Signal Monitor

AHashem

Part Number: TPS65313-Q1

As per the datasheet 11.9.11 MCU Error Signal Monitor, While calculating tTMS570_START_TO time, The duration of the start-up time-out window tTMS570_START_TO is set by the SAFETY_ERR_PWM_LMAX register and SAFETY_ERR_PWM_HMAX register setting (tPWM_LOWMAX + tPWM_HIGHMAX).

In SAFETY_ERR_PWM_LMAX_CFG Register, to calculate tTMS570_LOWMAX following formula is used:

tTMS570_LOWMAX = (PWML_MAX[7:0] + 1) × 5 μs, if MCU_ESM_CFG = 0

But in SAFETY_ERR_PWM_HMAX_CFG Register there is no formula for calculating tTMS570_HIGHMAX

Should I use same furmula from tTMS570_LOWMAX?

over 1 year ago

0 Niko Alatalo over 1 year ago

TI__Mastermind 21240 points

Hi,

I am looking into this and will get back to you tomorrow.

regards,

Niko

0 Niko Alatalo over 1 year ago in reply to Niko Alatalo

TI__Mastermind 21240 points

Hi,

I am still waiting feedback from the team.

regards,

Niko

0 Niko Alatalo over 1 year ago in reply to Niko Alatalo

TI__Mastermind 21240 points

Hi,

DS defines only tTMS570_LOWMAX since MCU Error in this mode is detected when MCU drives its ERROR output pin strong low. There is no mode in which MCU signals this error by driving its ERROR output pin high.

The un-recoverable MCU error is detected if MCU ERROR output remains low for minimum duration defined by tTMS570_LOWMAX.

regards,

Niko

0 AHashem over 1 year ago in reply to Niko Alatalo

Intellectual 270 points

But this part of the DS mentions that The duration of the start-up time-out window tTMS570_START_TO is set by the SAFETY_ERR_PWM_LMAX register and SAFETY_ERR_PWM_HMAX register setting (tPWM_LOWMAX + tPWM_HIGHMAX).

0 Niko Alatalo over 1 year ago in reply to AHashem

TI__Mastermind 21240 points

Hi Amr,

there is an equation for both tPWM_LOWMAX and tPWM_HIGHMAX.

In the TMS570 mode only the low level time matters since when the MCU pulls the MCU_ERR pin low it has to pull it back HIGH before the timer expires (time > tTMS570_LOWMAX).

regards,

Niko

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TPS65313-Q1: MCU Error Signal Monitor