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PDF ATA6809 Data sheet ( Hoja de datos )
| Número de pieza | ATA6809 | |
| Descripción | Fail-safe IC | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Digital Self-supervising Watchdog with Hysteresis
• Three 250-mA Output Drivers
• One Relay Driver, Two Lamp Drivers
• Lamp Drivers With Auxiliary Ground
• Short-circuit-protected Lamp Drivers
• Lamp Drivers With Status Feedback
• Enable Output
• Overvoltage/Undervoltage Detection and Reset
• All Power Outputs Protected Against Standard Transients
• All Power Outputs Protected Against 40V Load Dump
• Lamp Drivers Automatically Activated if VS is Disconnected
• Lamp Drivers Automatically Activated Via AUX GND if Standard
Ground is Disconnected
1. Description
The ATA6809 is designed to support the fail-safe function of safety-critical systems
such as ABS. It includes a relay driver, two independent short-circuit-protected lamp
drivers which are supplied by redundant ground lines, two monitoring circuits for the
lamp driver output voltage and output current, a watchdog controlled by an external
RC network, and a reset circuit initiated by an overvoltage or undervoltage condition
of the 5V supply providing a positive and a negative reset signal.
www.DataSheet4U.com
Fail-safe IC with
Relay Driver
and Lamp
Driver
ATA6809
Rev. 4902A–AUTO–11/05
1 page  
ATA6809
Table 3-1. Truth Table for Lamp Drivers and Lamp Feedback
Inputs
Lamp Lamp
Lamp (I) Voltage Current
Lamp
Driver
Current
Outputs
Lamp
Current
Feedback
Lamp
0 1 0 Off Off
1
0 1 1 On Off
0 0 1 On On
0 0 0 Off On
1 0 1 On On
1 1 1 On Off
1
0
0
0
1
1 1 0 Off Off
1
1 0 0 Off On/off
1
Note:
Lamp voltage is logic 1 if output voltage > threshold voltage detection
Lamp voltage is logic 0 if output voltage < threshold voltage detection
Lamp current is logic 1 if output current > threshold current detection
Lamp current is logic 0 if output current < threshold current detection
Comment
Output ok or open (internal pull-up) or shorted to
VBatt
Output shorted to VBatt and faulty input level
Internal driver activated due to internal failure
Output shorted to GND
Output ok
Output shorted to VBatt
Internal driver deactivated due to internal failure or
thermal shutdown
Output shorted to GND or open
Table 3-2. Table of Fault Detection
Condition
Normal operation
Lamp output shorted to GND
Lamp output shorted to VBatt
Lamp output open
Feedback shorted to GND
Feedback shorted to VS
Lamp input shorted to GND
Lamp input shorted to VS
Lamp Input is 0 (Lamp Off)
1
0 (= detection)
1 (= no detection)
1 (= no detection)
0 (= detection)
1 (= no detection)
1 (= no detection)
0 (= detection)
Feedback Lamp
Lamp Input is 1 (Lamp On)
0
1 (= detection)
1 (= detection)
1 (= detection)
0 (= no detection)
1 (= detection)
1 (= detection)
0 (= no detection)
4902A–AUTO–11/05
5
5 Page 
ATA6809
7. Electrical Characteristics (Continued)
VS = 5V, Tamb = –40 to +125°C; reference pin is GND; fintern = 100 kHz + 50% – 45%, fWDC = 10 kHz ±10%; fWDI = 100Hz
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Reset and VS Control
Lower reset level
Upper reset level
Hysteresis
VS 4.5
VS 5.2
25
4.8 V
5.5 V
mV
Reset debounce time
120 500 µs
Reset delay
20 80 ms
Watchdog Timing
Feedback reaction time
(FBLA1, FBLA2)
No fault, edge at LA1I, LA2I
tFB 2.56
12.8 ms
Minimum lamp input toggle time for a
secure feedback reaction
No fault, pulse at LA1I, LA2I
tP,FB 10.24
ms
Power-on-reset prolongation time
Detection time for RC-oscillator fault
Time interval for overvoltage/
undervoltage detection
VRC = constant
tPOR
tRCerror
tD,OUV
34.3
81.9
0.16
103.1
246
0.64
ms
ms
ms
Reaction time of NRES output on
overvoltage/undervoltage
tR,OUV
0.187
0.72 ms
Minimum toggle time for a secure
broken ground detection
tP,BGND
13.3
µs
Maximum reaction time for broken
ground detection
Nominal frequency for WDI
Nominal frequency for RC
Minimum pulse duration for a secure
WDI input pulse detection
fRC = 100 × fWDI
fWDI = 1 / 100 × fRC
tR,BGND
fWDI
fRC
tP,WDI
10
1
182
100 µs
130 Hz
13 kHz
µs
Frequency range for a correct
WDI signal
fWDI 64.7
112.5
Hz
Number of incorrect WDI trigger
counts for locking the outputs
nlock
3
Number of correct WDI trigger counts
for releasing the outputs
nrelease
3
Detection time for a stuck
WDI signal
VWDI = constant
tWDIerror
24.5
25.5 ms
Watchdog Timing Relative to fRC
Minimum pulse duration for a securely
WDI input pulse detection
2 cycles
Frequency range for a correct
WDI signal
80 170 cycles
Hysteresis range at the
WDI ok margins
1 cycle
Detection time for a stuck
WDI signal
VWDI = constant
250 251 cycles
4902A–AUTO–11/05
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ATA6809.PDF ] | |
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