U5021M-NFPG3

U5021M-NFPG3 Datasheet


U5021M

Part Datasheet
U5021M-NFPG3 U5021M-NFPG3 U5021M-NFPG3 (pdf)
Related Parts Information
U5021M-NFPY U5021M-NFPY U5021M-NFPY
U5021M-NFPG3Y U5021M-NFPG3Y U5021M-NFPG3Y
PDF Datasheet Preview
• Low Current Consumption IDD < 100 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

Digital Window Watchdog Timer

U5021M

The digital window watchdog timer, U5021M, is a CMOS integrated circuit. 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 microcontroller. 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 U5021M offers a complete monitoring solution for microsystems in automotive and industrial applications.

Figure Block Diagram with External Ciruit

OSC 8

RC Oscillator

C VDD
10 nF

Reset 5

Microcontroller

Trigger 2

Mode 3

Input signal conditioning

Power-on reset

Wake-up 1
7 GND

State machine

External
switching

Enable circuitry

Test logic

Pin Configuration

Figure Pinning SO8 WAKE-UP 1 TRIG 2 MODE 3 ENA 4
8 OSC 7 GND 6 VDD 5 RESET
2 U5021M

U5021M

Pin Description

Symbol Function

Wake-up input pull-down resistor

WAKE-UP 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

TRIG

Trigger input pull-up resistor It is connected to the microprocessor’s trigger signal.

MODE

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
Ordering Information

Extended Type Number U5021M-NFPY U5021M-NFPG3Y

Package Information

Package SO8

Remarks Tubed, Pb-free Taped and reeled, Pb-free

Package SO8

Dimensions in mm
technical drawings according to DIN specifications

History
4756D-AUTO-11/05
• Put datasheet in a new template
• First page Pb-free logo added
• Page 7 figure 5-1 changed
• Page 9 Ordering Information changed
4756C-AUTO-09/04
• Electrical Characteristics Table, page 8, row “Reset capability” changed in “Reset level for low VDD“
4756B-AUTO-07/04
• Electrical Characteristics Table, page 8, row “Reset capability” added
10 U5021M

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More datasheets: 55-00048 | 55-00043 | 55-00084 | 55-00097 | 55-00098 | 55-00004 | 3548 | 948 | 832202B00000 | PCA-6010G2-00A2E


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Datasheet ID: U5021M-NFPG3 519506