U5021M-NFP

U5021M-NFP Datasheet

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.

Part	Datasheet
U5021M-NFP	U5021M-NFP (pdf)

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 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. U5021M Figure Block Diagram with External Ciruit OSC 8 Reset 5 RC Oscillator C VDD 10 nF 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 WAKE-UP TRIG MODE RESET Function 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 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 Ordering Information Extended Type Number U5021M-NFP Package Information Package SO8 Remarks Package SO8 Dimensions in mm technical drawings according to DIN specifications Electrical Characteristics Table, page 8, row “Reset capability” changed in “Reset level for low VDD“ 10 U5021M Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel 41 26-426-5555 Fax 41 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel 852 2721-9778 Fax 852 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel 81 3-3523-3551 Fax 81 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel 33 2-40-18-18-18 Fax 33 2-40-18-19-60 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel 33 4-42-53-60-00 Fax 33 4-42-53-60-01 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel 1 719 576-3300 Fax 1 719 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel 44 1355-803-000 Fax 44 1355-242-743 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel 49 71-31-67-0 Fax 49 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel 1 719 576-3300 Fax 1 719 540-1759 Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel 33 4-76-58-30-00 Fax 33 4-76-58-34-80 Literature Requests Disclaimer Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life support devices or systems. Atmel Corporation All rights reserved. and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper.

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

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.

U5021M

Figure Block Diagram with External Ciruit

OSC 8

Reset 5

RC Oscillator

C VDD
10 nF

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

WAKE-UP

TRIG

MODE

RESET

Function

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

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
Ordering Information

Extended Type Number U5021M-NFP

Package Information

Package SO8

Remarks

Package SO8

Dimensions in mm
technical drawings according to DIN specifications

Electrical Characteristics Table, page 8, row “Reset capability” changed in “Reset level for low VDD“
10 U5021M

Atmel Corporation
2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 487-2600

Regional Headquarters

Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel 41 26-426-5555 Fax 41 26-426-5500

Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel 852 2721-9778 Fax 852 2722-1369

Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel 81 3-3523-3551 Fax 81 3-3523-7581

Atmel Operations

Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314

Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314

La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel 33 2-40-18-18-18 Fax 33 2-40-18-19-60

ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel 33 4-42-53-60-00 Fax 33 4-42-53-60-01
1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel 1 719 576-3300 Fax 1 719 540-1759

Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland Tel 44 1355-803-000 Fax 44 1355-242-743

RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel 49 71-31-67-0 Fax 49 71-31-67-2340 1150 East Cheyenne Mtn. Blvd. Colorado Springs, CO 80906, USA Tel 1 719 576-3300 Fax 1 719 540-1759

Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom

Avenue de Rochepleine BP 123 38521 Saint-Egreve Cedex, France Tel 33 4-76-58-30-00 Fax 33 4-76-58-34-80

Literature Requests

Disclaimer Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life support devices or systems.

Atmel Corporation All rights reserved. and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others.

Printed on recycled paper.

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Datasheet ID: U5021M-NFP 519505