ATA6824 ATMEL Corporation, ATA6824 Datasheet - Page 7

• Manufacturer Part Number: ATA6824
• Description: High Temperature H-bridge Motor Driver
• Manufacturer: ATMEL Corporation

Figure 5-1.
5.3.1
4931C–AUTO–09/06
/RESET
WD
Timing Sequence
t
res
Timing Diagram of the Watchdog Function
t
d
For example, with an external resistor R
of the watchdog.
T
The times t
After ramp-up of the battery voltage (power-on reset), the V
reset output, /RESET, stays low for the time t
initial lead time t
edge on WD to start its normal window watchdog sequence. If no rising edge is detected, the
watchdog will reset the microcontroller for t
Times t
receiving a reset from the watchdog, the triggering signal from the microcontroller must hit the
timeframe of t
Figure 5-2.
OSC
= 12.32 µs, t
1
t
1
(close window) and t
res
2
= 68 ms and t
T
= 9.61 ms. The trigger event will restart the watchdog sequence.
WD
d
1
(typically 68 ms for setups in the controller) the watchdog waits for a rising
versus R
= 12.1 ms, t
60
40
30
20
50
10
t
0
2
10
d
WD
= 68 ms are fixed values with a tolerance of 10%.
2
20
2
(open window) form the window watchdog sequence. To avoid
= 9.61 ms, T
30
t
1
WD
40
res
= 33 k ±1% we get the following typical parameters
WD
res
and wait t
50
RWD (k )
(typically 68 ms), then switches to high. For an
= 16.88 ms ±10%
60
ATA6824 [Preliminary]
max
d
for the rising edge on WD.
t
2
70
min
CC
80
t
resshort
regulator is switched on. The
90
typ
100
t
d
7