TLE6266G datasheet(22/50 Pages) INFINEON

22 / 50 page

Target Datasheet TLE 6266

Version 1.06

2002-11-26

Figure 9

Cyclic Wake with Wake Pin

7.3

Wake-Up Cyclic Wake Autotiming Function

CANL is pulled to Vs. After the transition from HS ON to HS OFF, an autotiming function

is started. This is a timer controled by the internal oscillator, which can be programed by

SPI IBit 12,13. If the timer exceeds the programed time this causes a wake up and

automatic transition into the cyclic HS ON mode (see Figure 10). HS3 is activated again

and also the long open window of the watchdog mechanism. The watchdog has to be

triggered correctly from that time on. If the signal at the PWM pin makes a HIGH to LOW

transition, the device switches to HS OFF again.

This wake up via the autotiming function is not flagged to the µC by setting the RxD pin.

Normal Mode

Cyclic HS ON

Cyclic HS OFF

SPI

cyclic HS

Mode State

SPI word*

Wake

PWM

HS3

Watchdog trigger bit

=SPI bit0**

SPI

normal

mode

PWM

trigger

Window watchdog***

CSN,

Normal Mode

closed

window

open

window

open

window

closed

window

long open window

Cyclic HS ON

Wake event

long open window

Cyclic HS ON

closed

window

open

window

closed

window

open

window

missing trigger =

timeout =

Watchdog Reset

long open window

Normal Mode

Vbat Stdby

wake trigger

PWM trigger

Input filtering time t

IFT

Watchdog reset pulse time t

WDR

** bit0 is transfered with the SPI input word

BUT

the watchdog trigger is set, after readout of

the SPI input bit = CSN LOW to HIGH

(see arrows at CSN signal)

* for the exact timing relations between CSN

and SPI-DI and -DO word please look at

datasheet fig. 11,12,13,14,15

*** for a correct watchdog triggering:

closed window must always exceed 12 cycles

open window is max. 20 cycles

long open window is max. 128 cycles

otherwise

a watchdog reset will be generated

SPI

normal

mode

SPI

cyclic HS

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