TLE8080EM Datasheet, PDF (29/39 Pages) Infineon Technologies AG – Engine Management IC for Small Engines

TLE8080EM
Serial Peripheral Interface (SPI)
Reset of the over current diagnosis bits of channels 1 and 3:
• Diagnosis register was read out:
– input pin INx remains high: no reset of the over current diagnosis bit, the channel remains switched off
– input pin INx transition from high to low: the over current diagnosis bit is reset, the channel could be switched
on again
• Diagnosis register was not read out
– channel remains switched off and no reset of the over current diagnosis bit is done
– input pin INx is low: with the next read access of the diagnosis register the diagnosis bits are reset
Reset of the over current diagnosis bits of channels 4 and 5:
• Diagnosis register was not read out
– channel remains switched off and no reset of the over current diagnosis bit is done
• Diagnosis register was read out:
– SPI command register write command is not sent: no reset of the over current diagnosis bit, the channel
remains switched off
– SPI command register write command is sent: the over current diagnosis bit is reset, the channel will be
switched according the status of the control bit
Set and Reset of the over current diagnosis bit of channel 2:
The over current diagnosis register bit for channel 2 is set asynchronously of the internal clock with the output
signal of the detection circuit. With this signal the output is switched off and the counter for the off time t_oc,off of the
repetitive switching cycle starts. After t_oc,off the channel will be switched on again. With an remaining over current
condition the channel will be switched on repetitively. This internal overcurrent status of the channel is latched
internally. The internal over current status is reset in two situations.
• over current condition exists no longer: the internal over current status is reset after the time t_oc,St
• over current condition remains and the channel is switched off: the internal over current status is reset after
the time t_oc,off
The reset of the over current diagnosis register bit for channel 2 is related to the internal over current status. In
Figure 14 and Figure 15 the behavior of the diagnosis with temporary and permanent over current condition is
drawn.
Data Sheet
29
Rev. 1.1, 2012-10-19