Rainbow Electronics ATA6823 - Manual (Page 18)

18
4856E–AUTO–07/07
ATA6823 [Preliminary]
2.9 HIGH threshold VMODE 1 VMODE H 4.0 V A
2.10 LOW threshold VMODE 1 VMODE L 0.7 V A
3 Reset and Watchdog
3.1
V
CC
threshold voltage
level for /RESET
VMODE = “H”
(VMODE = “L”)
29 V
tHRESH
4.6
(3.05)
V A
3.2
V
CC
threshold voltage
level for /RESET
VMODE = “H”
(VMODE = “L”)
29 V
tHRESL
4.1 (2.7) V A
3.3
Hysteresis of /RESET
level
(4) 29 HYS
RESth
0.2 V A
3.4
Length of pulse at
/RESET pin
(5) 5 t
res
6800 T
100
A
3.5
Length of short pulse at
/RESET pin
(5) 5 t
resshort
200 T
100
A
3.6
Wait for the first WD
trigger
(5) 5 t
d
6800 T
100
A
3.7
Time for VCC < V
tHRESL
before activating /RESET
(4) 29 t
delayRESL
0.5 2 µs C
3.8
Resistor defining internal
bias currents for
watchdog oscillator
3 R
RWD
10 91 k
Ω
D
3.9
Watchdog oscillator
period
R
RWD
= 33 k
Ω
3 T
OSC
11.09 13.55 µs A
3.10
Watchdog oscillator
period with internal
resistor
T
OSC_start
16 24 µs A
3.11
Watchdog input
low-voltage threshold
6 V
ILWD
0.3
×
V
VCC
V A
3.12
Watchdog input
high-voltage threshold
6 V
IHWD
0.7
×
V
VCC
V A
3.13
Hysteresis of watchdog
input voltage threshold
6 V
hysWD
1 V A
3.14 Close window (5) t1
980
×
T
OSC
A
9. Electrical Characteristics (Continued)
All parameters given are valid for 7V
≤
VBAT
≤
18V and for –40°C
≤ ϑ
ambient
≤
125°C unless stated otherwise.
No. Parameters Test Conditions Pin Symbol Min Typ Max Unit Type*
* Type: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. EN, DIR, PWM = high
2. The use of X7R material is recommended
3. For higher values, stability at zero load is not guaranteed
4. Tested during qualification only
5. Value depends on T
OSC
; function tested with digital test pattern
6. Tested during characterization only
7. Supplied by charge pump
8. See section “Cross Conduction Time”
9. Voltage between source-drain of external switching transistors in active case
10. The short-circuit message will never be generated for switch-on time < t
sc