TLE 6263-3G Infineon Technologies, TLE 6263-3G Datasheet - Page 14

• Manufacturer Part Number: TLE 6263-3G
• Manufacturer: Infineon Technologies

Specifications of TLE 6263-3G

• Packages: PG-DSO-28
• Transceiver: Fault-tollerant CAN ISO 11898 - 3
• Voltage Regulator Output: 120 mA
• Watchdog: Window Watchdog
• Quiescent Current (max.): < 85 ?A (5V on)
• Standby Current: < 500 ?A (5V on)

Data Sheet TLE 6263-3G
period a watchdog trigger is detected as a “rising edge” by sampling a HIGH on the IBIT
0. The trigger is accepted when the CSN input becomes HIGH after the transmission of
the SPI word. After each reset as well as after a power on condition the default value of
IBIT 0 is LOW.
Closed and Open Window
A correct watchdog trigger results in starting the window watchdog by opening a closed
window of typ. 6 ms followed by a open window of typ. 10 ms. From now on the
microcontroller has to service the watchdog trigger by inverting the IBIT 0 alternating.
The “negative” or “positive” edge has to meet the open window time. A correct watchdog
service immediately results in starting the next closed window. Please refer to figure 12,
Watchdog Timing Diagram.
Watchdog Reset
Should the trigger signal not meet the open window a watchdog reset is created by
setting the reset output RO low for a period of typ. 2 ms. Then the watchdog starts again
by opening a long open window. In addition, the SPI OBIT 1 (diagnosis bit 1) is set HIGH
until the next successful watchdog trigger to monitor a watchdog reset. OBIT1 is also
HIGH until the watchdog is correctly triggered after power-up / start-up. For fail safe
reasons the TLE6263 is automatically switched in Vbat-stand-by mode if a watchdog
trigger failure occurs. So the power consumption can be minimized in case of a
permanent faulty microcontroller.
In case of either an undervoltage reset or a watchdog reset all SPI input registers (IBIT
0 to IBIT 7) are set low.
Undercurrent Disabling Function
To avoid cyclic wake-up’s of the microcontroller due to missing watchdog pulses when
the microcontroller is in a low power mode, an automatic undercurrent disabling function
of the watchdog circuit can be selected for the TLE6263-3G V
-stand-by mode. For
bat
activation of this feature, the V
output current in the V
-stand-by mode has to be less
CC
bat
than the undercurrent threshold (I
< I
) and in addition the SPI IBIT 7 has to be
CC
CCWD
set HIGH. When the microcontroller returns back to normal mode or the output current
becomes higher than I
> I
the watchdog circuit is enabled again. A long open
CC
CCWD
window is started then, to ensure a simple synchronization of the watchdog timing to the
watchdog services of the microcontroller.
6.7
Flash program mode
To disable the watchdog feature a flash program mode is available. This mode is
selected by applying a voltage of 6.8V < V
< 7.2V at pin INT. This is useful e.g. if the
INT
flash-memory of the micro has to be programmed and therefore a regular watchdog
triggering is not possible. If the SPI is required in the flash program mode to change e.g.
the mode of the TLE6263 the first input telegram has to be “00000000”.
Revision 3.2
14
2008-11-26