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U6813B Datasheet(PDF) 4 Page - ATMEL Corporation

Part No. U6813B
Description  Fail-safe IC with High-side and Relay Driver
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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U6813B Datasheet(HTML) 4 Page - ATMEL Corporation

 
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4
4543B–AUTO–10/05
U6813B
3.
Fail-safe Functions
A fail-safe IC has to maintain its monitoring function even if there is a fault condition at one of the
pins (e.g., short circuit), ensuring that a microcontroller system does not reach a “critical status”.
A critical status means, for example, if the system is not able to switch off the relay or disable the
power MOSFET, or if the system is not able to provide a signal to the microcontroller via
ENABLE- and RESET-outputs in the case of a fault condition. The U6813B is designed to han-
dle those fault conditions according to Table 3-1 for a maximum of system safety.
Notes:
1. default state at open input
2. P-EN disable: low
3. N-EN disable: high
4.
Watchdog Description
Figure 4-1.
Watchdog Block Diagram
The microcontroller is monitored by a digital window watchdog which accepts an incoming trig-
ger signal of a constant frequency for correct operation. The frequency of the trigger signal can
be varied in a broad range as the watchdog’s time window is determined by external R/C com-
ponents. The following description refers to the watchdog timing diagram with tolerances (see
Figure 4-2 on page 5).
Table 3-1.
Truth Table
VCC
3.3V
WDI
RELI
FETI
RELO
FETO
N-RES
P-RES
P-EN(2)
N-EN(3)
ok
ok
ok
H
x
on
x
H
L
H
L
ok
ok
ok
L(1)
x
off
x
H
L
H
L
ok
ok
ok
x
H
x
on
H
L
H
L
ok
ok
ok
x
L (1)
x
off
HLHL
ok
ok
wrong
x
x
off
off
H
L
L
H
x
wrong
x
x
x
off
off
L
H
L
H
wrong
x
x
x
x
off
off
L
H
L
H
Slope
detector
Up/down
counter
Dual MUX
Binary counter
RS-FF
WDC
WDI
RESET
OSCERR
WD-OK


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