TLE 8264E Infineon Technologies, TLE 8264E Datasheet - Page 60

• Manufacturer Part Number: TLE 8264E
• Manufacturer: Infineon Technologies

Specifications of TLE 8264E

• Packages: PG-DSO-36
• Transceiver: High Speed CAN ISO 11898 - 5 / 3 x LIN2.1 / J2602
• Voltage Regulator Output: 2 x 200 mA + 400 mA
• Watchdog: Standard and Window Watchdog
• Quiescent Current (max.): 28 ?A (typ) Sleep Mode (5V on)
• Standby Current: 58 ?A (typ) Stop Mode (5V on)

11.2.4
During SBC Stop Mode and SBC SW Flash Mode, it is possible to deactivate the watchdog. To avoid unwished
deactivation of the watchdog, a special protocol has to be followed, prior deactivating the watchdog. Please refer
to
interrupt is generated (if not inhibited), and the Wrong WD set bit in the SPI is set.
When the microcontroller requests the SBC to go back to SBC Normal Mode, the Watchdog is reactivated. The
watchdog settings that were valid before entering Stop Mode with watchdog off are valid. The watchdog timer
starts with entering Normal Mode. In case window watchdog was selected the watchdog starts with a closed
window. When setting the WD Refresh bit to 0 for the command that sends the device to Normal Mode the first
watchdog trigger is a change to 1. As in Stop Mode the watchdog settings can not be changed, it is also not
possible to change the watchdog settings with the command that sets the SBC from Stop Mode into Normal Mode.
Figure 27
During SBC Stop Mode, when the cyclic wake feature is used and the watchdog is not disabled, it is necessary
that the microcontroller acknowledges the interrupt by reading the SPI Wake register before the next Cyclic Wake
occures. Otherwise, a reset is performed by setting the SBC to SBC Restart Mode.
Data Sheet
Figure
27. In the case the exact process below is not respected, the SBC remains in the previous state, and an
Inhibition of the watchdog
Inhibition of the watchdog
SBC SW Flash mode
WD OFF
SPI cmd =
SBC SW Flash mode
&,WD OFF
SPI cmd =
SBC SW Flash mode
&,WD OFF
& WD Trigger
(256ms max after reset relaxation)
SBC Init mode
First battery connection
WD not active
config0 not active
60
WD conf
(POR)
AND
Cyclic WK
Cyclic WK
ON / OFF
ON / OFF
SBC Normal mode
SBC Normal mode
SBC Stop mode
WD active
WD active
WD OFF
SPI cmd =
SBC Normal mode
& WD OFF
& WD Trigger
SPI cmd =
SBC Stop mode
& WD OFF
& WD Trigger
SPI cmd
WD conf
inhibition of the WD .vsd
Supervision Functions
WD trig
Rev. 1.0, 2009-03-31
TLE8264E