U6813B Ver la hoja de datos (PDF) - Atmel Corporation
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U6813B Datasheet PDF : 16 Pages
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U6813B
7. Electrical Characteristics (Continued)
VCC = 5V, Tamb = –40 to +125°C; reference pin is GND or SGND (over- and under-voltage detection);
fintern = 200 kHz +50%/–45%, fWDC = 5 kHz ±10%; fWDI = 50 Hz, bootstrap capacitor CBoot = 47 nF at pin CAPI
No. Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
14 RC Oscillator WDC
14.1 Oscillator frequency
15 Watchdog Timing
ROSC = 36 kΩ
COSC = 6.8 nF
10
fWDC
4.5
5
5.5
kHz
15.1
Power-on-reset
prolongation time
tPOR
34.3
103.1
ms
15.2
Detection time for
RC-oscillator fault
VCR = constant
tRCerror
81.9
246
ms
Time interval for
15.3 over/under-voltage
detection
tD,OUV
0.16
0.64
ms
Reaction time of reset
15.4 output at over/under
voltage
tR,OUV
0.187
0.72
ms
15.5
Nominal frequency for
WDI
fRC = 100 fWDI
fWDI
10
65
Hz
15.6
Nominal frequency for
WDC
fWDI = 1/100 fWDC
fWDC
1
6.5
kHz
Minimum pulse
15.7
duration for a
guaranteed WDI
fWDC = 5 kHz
tP,WDI
364
µs
input-pulse detection
15.8
Frequency range for a
correct WDI signal
fWDC = 5 kHz
fWDI
32.35
56.25
Hz
Number of incorrect
15.9 WDI trigger counts for
locking the outputs
nlock
3
15.10
Number of correct
WDI trigger counts for
releasing the outputs
nrelease
3
15.11
16
16.1
Detection time for a
stucked WDI signal
VWDI = constant
fWDC = 5 kHz
Watchdog Timing Relative to fWDC
Minimum pulse
duration for a
guaranteed WDI
input-pulse detection
tWDIerror
49
51
ms
2
cycles
16.2
Frequency range for a
correct WDI signal
80
170 cycles
16.3
Hysteresis range at
the WDI ok margins
1
cycle
Detection time for a
16.4 stucked WDI signal
(WDI dropout)
VWDI = constant
250
251 cycles
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. If VS > 26 V the current has to be limited at 5 mA by an external resistor.
Type*
A
A
A
A
A
D
D
A
D
A
A
A
A
D
A
A
11
4543B–AUTO–10/05
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