TLE7242-2G Datasheet, PDF (20/50 Pages) Infineon Technologies AG – 4 Channel Fixed Frequency Constant Current Control IC

PWM_Start
OUTx
Vpos
OL-ON-F
SPI Message
Diagnostic Read
TLE7242-2G
Functional Description and Electrical Characteristics
64 * PWM period
Figure 13 Open - On
5.3.2 Off-State Diagnostics
The off-state diagnostics function in both constant current mode and in on/off mode.
When the OUTx pin transitions low, the fault timers are cleared to 0 and the tested timer starts to count up. If the
tested timer expires, the Bit OFF-T in the FAULT register is set. If a SPI fault register read occurs, the tested timer
is cleared to 0 and starts again to count up. If the OUTx pin transitions high, the tested-timer is cleared to zero and
then used for on-state diagnostics.
If the analog OL fault signal (OL-FA) changes to 1, the fault filter timer starts to count up. If the fault filter timer
expires, the digitally filtered OL fault signal (OL-ON-FD) is set to one.
If OL-FA changes to 0, OL-FD changes immediately to 0 and the fault filter timer is cleared to 0.
If the analog SG fault signal (SG-FA) changes to 1, the fault filter timer is cleared to 0 and starts to count up. If the
fault filter timer expires, the digitally filtered SG fault signal (SG-FD) is set to one. If SG-FA changes to 0, SG-FD
changes immediately to 0 and the fault filter timer is cleared to 0.
If SG-FD = 1 and the tested timer is expired then the SG-F bit in the FAULT register is set and the OL-OFF-F bit
in the FAULT register remains unchanged (independently from OL-OFF-FD).
If SG-FD = 0 and OL-OFF-FD = 1 then the OL-F Bit in the FAULT register is set.
If a SPI fault read occurs, the OFF-T Bit, the SG-F Bit and the OL-F Bit in the SPI registers are cleared to zero
(and the timers are cleared to 0).
Data Sheet
20
Rev. 1.0, 2008-07-09