U5021M
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U5021M-NFPY (pdf) |
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U5021M-NFPG3 |
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U5021M-NFPG3Y |
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• 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 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. 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More datasheets: 55-00043 | 55-00084 | 55-00097 | 55-00098 | 55-00004 | 3548 | 948 | 832202B00000 | PCA-6010G2-00A2E | U5021M-NFPG3 |
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