ATA6823-PHQW Atmel, ATA6823-PHQW Datasheet - Page 9

• Manufacturer Part Number: ATA6823-PHQW
• Description: IC H-BRIDGE MOTOR DRIVER 32-QFN
• Manufacturer: Atmel
• Type: H-Bridge Motor Driverr

Specifications of ATA6823-PHQW

• Configuration: H Bridge
• Input Type: PWM
• Delay Time: 4.25µs
• Current - Peak: 350mA
• Number Of Configurations: 1
• Number Of Outputs: 4
• Voltage - Supply: 6.5 V ~ 21.2 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Operating Supply Voltage: 7 V to 18 V
• Supply Current: 7 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.5.1
4856K–AUTO–01/11
Timing Sequence
For example, with an external resistor R
ters 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
time frame of t
Figure 3-4.
If triggering fails, /RESET will be pulled to ground for a shortened reset time of typically 2 ms.
The watchdog start sequence is similar to the power-on reset.
The internal oscillator is trimmed to a tolerance of < ±10%. This means that t
vary by ±10%. The following calculation shows the worst case calculation of the watchdog
period T
t
t
T
T
T
Figure 3-4
nal resistor R
A reset will be active for V
(HYS
1min
2min
OSC
wdmax
wdmin
wd
= 16.42ms ±3.15ms (±19.1%)
= 0.90
= 0.90
= 12.32µs, t
RESth
= t
= t
1
wd
(close window) and t
1max
1min
).
which the microcontroller has to provide.
above shows the typical watchdog period T
res
OSC
+ t
= 13.28ms
= 68ms and t
t
t
2
1
2
T
= 9.61ms. The trigger event will restart the watchdog sequence.
WD
= 10.87ms, t
= 8.65ms, t
2min
d
.
1
(typically 68ms for setups in the controller) the watchdog waits for a rising
= 12.1ms, t
versus R
= 10.87ms + 8.65ms = 19.52ms
60
40
30
20
50
10
0
10
d
2max
WD
= 68ms are fixed values with a tolerance of 10%.
1max
CC
2
20
2
(open window) form the window watchdog sequence. To avoid
= 9.61ms, T
= 1.10
< V
= 1.10
30
tHRESx
WD
40
t
2
t
; the level V
res
1
= 10.57ms
WD
= 33 k ±1% we get the following typical parame-
= 13.28ms
res
and wait t
50
RWD (k )
= 16.88ms ±10%
(typically 68ms), then switches to high. For an
60
max
WD
d
tHRESx
for the rising edge on WD.
70
depending on the value of the exter-
min
CC
80
is realized with a hysteresis
Atmel ATA6823
regulator is switched on. The
90
typ
100
1
and t
2
can also
9