U5021M-NFP Atmel, U5021M-NFP Datasheet - Page 6

• Manufacturer Part Number: U5021M-NFP
• Description: IC TIMER WATCHDOG DIGITAL 8-SOIC
• Manufacturer: Atmel
• Type: Watchdog Circuitr

Specifications of U5021M-NFP

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active High
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 4.2V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 6. Pulse Diagram of a Correct Trigger Sequence During the Short Watchdog Time
Figure 7. Pulse Diagram of the Long Watchdog Time
6
U5021M
Reset out
Mode
Trigger
Enable
Reset out
Wake-up
Mode
Trigger
Enable
V
DD
Figure 7 shows the switch-over from the short to the long watchdog mode. The wake-up
signal during the enable time, t
The watchdog can be switched back from the long to the short watchdog mode with a
low potential at the mode pin (pin 3).
t
2
t
0
t
1
t
4
t
2
5
, activates a reset pulse, t
t
t
trig
t
3
5
t
6
6
.
t
t
2
1
Pin 3
Pin 2
Pin 4
Pin 5
Pins 1
4756C–AUTO–09/04
Pin 6
Pin 5
Pin 3
Pin 2
Pin 4