TLE9263QX
High-Side Switch
9.2.1
Over and Under Voltage Switch Off
All HS drivers in on-state are switched off in case of over voltage on VSHS (VSHS,OVD). If the voltage drops below
the over voltage threshold the HS drivers are activated again. The feature can be disabled by setting the SPI bit
HS_OV_SD_EN.
The HS drivers are switched off in case of under voltage on VSHS (VSHS,UVD). If the voltage rises above the under
voltage threshold the HS drivers are activated again. The feature can be disabled by setting the SPI bit
HS_UV_SD_EN.
So after release of under voltage or over voltage condition the HS switch goes back to programmed state in which
it was configured via SPI. This behavior is only valid if the bit HS_OV_UV_REC is set to ‘1’. Otherwise the switches
will stay off and the respective SPI control bits are cleared are cleared.
The over voltage and under voltage is signaled in the bits VSHS_OV and VSHS_UV, no other error bits are set.
9.2.2
Over Current Detection and Switch Off
If the load current exceeds the over current shutdown threshold for a time longer then the over current shutdown
filter time the output is switched off.
The over current condition and the switch off is signaled with the respective HSx_OC_OT bit in the register
HS_OC_OT_STAT. The HSx configuration is then reset to 000 by the SBC. To activate the High-Side again the
HSx configuration has to be set to ON (001) or be programmed to a timer function. It is recommended to clear the
over current bit before activation the High-Side switch, as the bits are not cleared automatically by the SBC.
9.2.3
Open Load Detection
Open load detection on the High-Side outputs is done during on state of the output. If the current in the activated
output falls below then Open Load Detection current, the open load is detected and signaled via the respective bit
HS1_OL, HS2_OL, HS3_OL, or HS4_OL in the register HS_OL_STAT. The High-Side output stays activated. If
the open load condition disappears the Open Load bit in the SPI can be cleared. The bits are not cleared
automatically by the SBC.
9.2.4
HSx Operation in Different SBC Modes
•
During SBC Stop and SBC Sleep Mode the HSx outputs can be used for the cyclic sense feature. The open-
load detection, over current shut down as well as over voltage and under voltage shutdown are available. The
over current shutdown protection feature may influence the wake-up behavior1).
•
•
the HSx output can also be enabled for SBC Stop and SBC Sleep Mode as well as controlled by the PWMx
generator. The HSx outputs must be configured in SBC Normal Mode before entering a low-power mode.
The HSx outputs are switched off during SBC Restart or SBC Fail-Safe Mode. They can be enabled via SPI if
the failure condition is removed.
1) For the wake feature, the forced over current shut down case must be considered in the user software for all SBC Modes,
i.e. due to disabled HSx switches a level change might not be detected anymore at WKx pins.
Data Sheet
60
Rev. 1.1, 2014-09-26
INFINEON [ Infineon ]
