Q67007-A9648 Ver la hoja de datos (PDF) - Infineon Technologies

Número de pieza

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Q67007-A9648

Multi-Voltage Processor Power Supply

Infineon Technologies 

TLE 6368 / SONIC

tCW=tCW

tOW=tCW

definition

closed window

open window

tSR = tOW/2

(not the same scale)

reset delay time without trigger

tWDR = tRES

(not the same scale)

definition

reset start delay time after window

watchdog timeout

reset duration time after window

watchdog time-out

tECW

fOSC=fOSCmax t EOW, w.c.= ( tCW+tOW )(1-∆)

worst cases

fOSC=fOSCmin t ECW, w.c.= tCW (1+∆)

t EOW = end of open window

t OWmin

Minimum open window time: t OWmin= tOW - ∆ * ( tOW + 2* tCW )

Example with:

tCW=128ms

∆=25% (oscillator deviation)

tECW, w.c. = 128(1.25) = 160ms

tEOW, w.c = (128+128)(0.75) = 192ms

towmin = 32ms

Figure 6 Window watchdog timing definition

Figure 6 shows some guidelines for designing the watchdog trigger timing taking the

oscillator deviation of different devices into account. Of importance (w.c.) is the

maximum of the closed window and the minimum of the open window in which the

trigger has to occur.

The length of the OW and CW can be modified by SPI command. If a change of the

window length is desired during the Watchdog function is operating please send the SPI

command with the new timing with a ’Watchdog trigger Bit’ D15=1.In this case the next

CW will directly start with the new length.

A minimum time gap of > 1/48 of the actual OW/CW time between a ’Watchdog disable’

and ’Watchdog enable’ SPI-command should be maintained. This allows the internal

Watchdog counters to be resetted. Thus after the enable command the Watchdog will

start properly with a full CW of the adjusted length.

Data Sheet, Rev. 1.32

14

2004-10-15

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