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PDF ATA5021 Data sheet ( Hoja de datos )
| Número de pieza | ATA5021 | |
| Descripción | Digital Window Watchdog Timer | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Low Current Consumption: IVDD < 25 µA
• RC Oscillator
• Internal Reset During Power-up and Supply Voltage Drops (POR)
• “Short” Trigger Window for Active Mode
• “Long” Trigger Window for Sleep Mode
• Cyclical Wake-up of the Microcontroller in Sleep Mode
• Trigger Input
• Single Wake-up Input
• Reset Output
• Enable Output
1. Description
The digital window watchdog timer, ATA5021, is designed in Atmel®’s state-of-the-art
0.8 µm SOI technology SMART-I.S.™1. In applications where safety is critical, it is
especially important to monitor the microcontroller. Normal microcontroller operation
is indicated by a cyclically transmitted trigger signal, which is received by a window
watchdog timer within a defined time window.
A missing or a wrong trigger signal causes the watchdog timer to reset the microcon-
troller. The IC is tailored for microcontrollers, which can work in both full-power and
sleep mode. With an additional voltage monitoring (power-on reset and supply voltage
drop reset), the ATA5021 offers a complete monitoring solution for micro-systems in
automotive and industrial applications.
Digital Window
Watchdog Timer
ATA5021
www.DataSheet4U.com
9145D–AUTO–05/10
1 page  
ATA5021
Table 3-1.
R1 (kΩ)
81.20
81.20
81.20
81.20
100.00
100.00
100.00
100.00
100.00
119.50
119.50
119.50
119.50
119.50
Comparison Table Clock Period Calculation versus Measurement on Test Board
C1 (nF)
Period “T” (µs) by Period “T” (µs) by
New Formula
Measurement
Deviation of New
Formula versus
Measurement
0.47 63.47
63.75
1.6%
1.04 136.32
135.00
1.9%
4.75 595.56
592.50
0.7%
10.49
1253.21
1240.00
1.3%
0.23 40.07
38.88
–2.1%
0.47 78.07
78.00
1.2%
1.04 167.76
164.00
–1.7%
4.75 733.17
730.00
0.9%
10.49
1542.84
1530.00
0.5%
0.23 47.81
46.38
–1.7%
0.47 93.20
93.00
0.8%
1.04 200.37
200.25
1.1%
4.75 875.90
870.00
0.5%
10.49
1843.26
1835.00
0.9%
The clock frequency determines all time periods of the logical part as shown in Section 7. “Elec-
trical Characteristics” on page 9 under the subheading “Timing”.
3.3 Supply Voltage Monitoring, Pin 5
During ramp-up of the supply voltage and in the case of supply-voltage drops, the integrated
power-on reset (POR) circuitry sets the internal logic to a defined basic status and generates a
reset pulse at the reset output, pin 5. A hysteresis in the POR threshold prevents the circuit from
oscillating. During ramp-up of the supply voltage, the reset output stays active for a specified
period of time (t0) in order to bring the microcontroller into its defined reset status (see Figure 3-1
on page 5).
3.4 Switch-over Mode Time, Pin 3
The switch-over mode time enables the synchronous operation of microcontroller and watchdog.
When the power-on reset time has elapsed, the watchdog has to be switched to monitoring
mode by the microcontroller by a “low” signal transmitted to the mode pin (pin 3) within the
time-out period, t1. If the low signal does not occur within t1 (see Figure 3-1 on page 5), the
watchdog generates a reset pulse, t6, and t1 starts again. Microcontroller and watchdog are syn-
chronized with the switch-over mode time, t1, each time a reset pulse is generated.
Figure 3-1. Power-on Reset and Switch-over Mode
VDD
www.DataSheet4U.com
Reset out
t0
Pin 6
t6
t1 Pin 5
Mode
Pin 3
9145D–AUTO–05/10
5
5 Page 
8. Ordering Information
Extended Type Number
ATA5021-TAPY
ATA5021-TAQY
Package
SO8
SO8
9. Package Information
Package: SO 8
Dimensions in mm
4.9±0.1
ATA5021
Remarks
Taped and reeled, Pb-free, small reel
Taped and reeled, Pb-free, big reel
5±0.2
3.7±0.1
0.4
1.27
3.81
85
14
Drawing-No.: 6.541-5031.01-4
Issue: 1; 15.08.06
3.8±0.1
6±0.2
technical drawings
according to DIN
specifications
www.DataSheet4U.com
9145D–AUTO–05/10
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ATA5021.PDF ] | |
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