TLE8262E datasheet(67/93 Pages) INFINEON

67 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

Limp Home

13.3

Activation of the Limp Home Output

The reason to activate the Limp Home pins and the consequences are listed in Table 12 and Table 13.

13.4

Release of the Limp Home Output

When Limp Home is activated via SPI command, then it is released via SPI command. This is useful for diagnosis

purpose for example.

Otherwise, the Limp Home outputs are released only in SBC Normal Mode with the following conditions: After the

device has been set to SBC Restart Mode, automatically entering SBC Normal Mode, a successful Watchdog

trigger must be sent via SPI. At this point, the Limp Home outputs remain active. Then the microcontroller needs

to send by SPI command the deactivation of the Limp Home.

13.5

Vcc1µC undervoltage time-out

cc1µC undervoltage time-out condition is given, when

1) the

cc1µC output voltage is below the reset threshold (VRT1, VRT2, VRT3),

S is higher then the threshold (VSthUV1, VSthUV2, VSthUV3) and

3) the condition is valid longer then the

cc1µC under voltage time-out (tVcc1UVTO).

cc1µC undervoltage time-out will sent the device into Fail-Safe Mode. Limp Home output stag will be activated

(for

s > VLHUV)

Figure 32 gives an example of the Limp Home output activation, due to a

cc1µC undervoltage time-out.

Table 12

Limp Home, Function of the SBC Mode

SBC Mode

Limp Home Outputs

INIT Mode

OFF

Normal Mode

OFF

ON via SPI

ON if it was ON until the successful Watchdog

setting and deactivation via SPI.

Stop Mode

Unchanged

Sleep Mode

Unchanged

Restart Mode

Unchanged

Fail-Safe Mode

SW Flash Mode

Unchanged

Table 13

Automatic Activation of Limp Home Output

SBC Mode

Reason

INIT Mode

INIT time-out (tINITTO)

Normal Mode

1st Watchdog failure (config 1/2)

2nd Watchdog failure (config 3/4)

Restart Mode

Reset output permanent short circuit to Vcc1µC

Reset output permanent short circuit to GND

cc1µC undervoltage time-out

Any mode

If previously turned ON in SBC Normal Mode, via SPI command

cc1µC thermal shutdown

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