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20 | Hardware Description
3.5
ECU Voltage Supervisor
The ECU voltage (VDDP) is monitored by the XETK to recognize whether the ECU is
switched on or off. Additionally the ECU RAM standby voltage (VDDSBRAM) is
monitored to determine if the standby RAM content is still valid. These two signals
are only used for monitoring therefore the load current is negligible.
NOTE
The BR_XETK-S1.0 only allows switching between reference page and working
page if there is a valid voltage at the sense pin and the working page has been
initialized by the calibration and development system.
The BR_XETK-S1.0 provides two possibilities to supply and supervise the ECU RAM
standby voltage:
- The BR_XETK-S1.0 monitors the VDDSBRAM supply on board the XETK. The
microcontroller's standby power supply pin must be connected to the XETK
pin VDDSBRAM.
- At the through-hole solder pad CON3 the BR_XETK-S1.0 can additionally
monitor the VDDSBRAMsense voltage if it is provided by the ECU. The micro-
controller's standby power supply pin must be connected to the XETK pin
VDDSBRAMsense. The microcontroller's standby power supply may be pro-
vided by the ECU or by the XETK.
ETAS BR_XETK-S1.0 | User Guide
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