TLE8262E Datasheet, PDF(66/93 Page) Infineon Technologies AG – Universal System Basis Chip HERMES Rev. 1.0

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TLE8262E Datasheet, PDF (66/93 Pages) Infineon Technologies AG – Universal System Basis Chip HERMES Rev. 1.0

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TLE8262E

Limp Home

13.1

Description

13.2

Limp Home output

The Limp Home output is an active LOW open drain transistor, please refer to Figure 31; therefore, it is necessary

to connect at least an external pull-up resistor at.

The Limp Home output is activated due to a failure condition or via SPI, see Chapter 13.3. If Vs is below VLHUV,

the Limp Home cannot be activated and remains as a high impedance.

Limp home logic

Limp home

LIMP HOME.VSD

Figure 31 Limp Home block diagram

13.2.1 Test Pin

The Test pin is used to set the SBC chip into SBC Software Development Mode. When the Test pin is connected

to GND, the SBC starts in SBC Software Development Mode. When the pin is left open, or connected to Vs the

SBC starts into normal operation. Please refer to Figure 3. The Test pin has an integrated pull-up resistor

(switched ON only during SBC Init Mode) to prevent the SBC device from starting in SBC Software Development

Mode during normal life of the vehicle, as for example when the battery has been disconnected. To avoid

disturbance, the Test pin is monitored during the Init Mode (from the time VS > VUVON until Init Mode is left). If the

pin is low for the Init Mode time, Software Development Mode is reached. The mode is stored during the complete

time where VS is above VUVOFF. It means to leave Software Development Mode, the SBC must go back to SBC

OFF mode.

Data Sheet

Rev. 1.0, 2009-03-31

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