U5020M-MFPG3Y Atmel, U5020M-MFPG3Y Datasheet - Page 3

• Manufacturer Part Number: U5020M-MFPG3Y
• Description: IC TIMER WATCHDOG DIGITAL 16SOIC
• Manufacturer: Atmel
• Type: Watchdog Circuitr

Specifications of U5020M-MFPG3Y

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active High
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 3.8V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Pin Description
4. Functional Description
4.1
4.2
4755B–AUTO–11/05
3 to 8
Pin
10
11
12
13
14
15
16
1
2
9
Supply, Pin 13
RC Oscillator, Pin 15
WAKE-UP
Symbol
RESET
MODE
TRIG
GND
VDD
OSC
ENA
TM
TM
TS
The U5020M requires a stabilized supply voltage V
characteristics.
An external buffer capacitor of C = 10 nF may be connected between pin 13 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
Test must not be connected
Test must be connected to GND
Wake-up inputs (pull-down resistor)
There are six digitally debounced wake-up inputs. During the long trigger mode each signal slope at the
inputs initiates a reset pulse at pin 10.
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.
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.
Supply voltage
Ground, reference voltage
RC oscillator
Time switch input
Programming pin to select different time durations for the long watchdog time.
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%, C1 = ±5%
DD
= 5 V ±5% to comply with its electrical
8. With an appropriate component
1
and C
1
according to the formula:
U5020M
Figure
3