U5021M-NFPY Atmel, U5021M-NFPY Datasheet - Page 3

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

Specifications of U5021M-NFPY

• 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)
• Output Type: Open Drain, Push-Pull
• Mounting Style: SMD/SMT
• Monitored Voltage: 4.5 V to 5.5 V
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (typ): 60 uA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Pin Description
4. Functional Description
4.1
4.2
4756D–AUTO–11/05
Pin
1
2
3
4
5
6
7
8
Supply Voltage, Pin 6
RC Oscillator, Pin 8
WAKE-UP
Symbol
RESET
MODE
TRIG
GND
VDD
OSC
ENA
The U5021M requires a stabilized supply voltage V
characteristics.
An external buffer capacitor of C = 10 nF may be connected between pin 6 and GND.
The clock frequency, f, can be adjusted by the components R
where t = 1.35 + 1.57 R
R
The clock frequency determines all time periods of the logic part as shown in the table “Electrical
Characteristics” under the subheading
selection, the clock frequency, f, is nearly independent of the supply voltage as shown in
4-1 on page
Frequency tolerance f
f
Wake-up input (pull-down resistor)
There is one digitally debounced wake-up input. During the long watchdog window, each signal slope at
the input initiates a reset pulse at pin 5.
Trigger input (pull-up resistor)
It is connected to the microprocessor’s trigger signal.
Mode input (pull-up resistor)
The processor’s mode signal initiates the switchover between the long and the short watchdog time.
Enable output (push-pull)
It is used for the control of peripheral components. It is activated after the processor triggers three times
correctly.
Reset output (open drain)
Resets the processor in the case of a trigger error or if a wake-up pulse occurs during the long watchdog
period.
Supply voltage
Ground, reference voltage
RC oscillator
Function
1
=
in k , C
1
-- -
t
1
in nF and t in µs
4.
max
1
(C
= 10% with R
1
+ 0.01)
1
“Timing” on page
±1%, C
1
= ±5%
DD
= 5 V ±5% to comply with its electrical
9. With an appropriate component
1
and C
1
according to the formula:
U5021M
Figure
3