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ADM8697 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM8697 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 13 page FUNCTIONAL BLOCK DIAGRAMS 1.3V VOUT VBATT VCC WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) POWER FAIL OUTPUT (PFO) RESET WATCHDOG TIMER BATT ON OSC IN OSC SEL WATCHDOG OUTPUT (WDO) RESET LOW LINE LLIN RESET GENERATOR WATCHDOG TRANSITION DETECTOR TIMEBASE FOR RESET AND WATCHDOG ADM8696 1.3V WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) POWER FAIL OUTPUT (PFO) RESET WATCHDOG TIMER OSC IN OSC SEL RESET LOW LINE WATCHDOG OUTPUT (WDO) LLIN RESET GENERATOR TIMEBASE FOR RESET AND WATCHDOG WATCHDOG TRANSITION DETECTOR ADM8697 CEIN CEOUT Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Microprocessor Supervisory Circuits ADM8696/ADM8697 FEATURES Upgrade for ADM696/ADM697, MAX696/MAX697 Specified Over Temperature Adjustable Low Line Voltage Monitor Power OK/Reset Time Delay Reset Assertion Down to 1 V VCC Watchdog Timer—100 ms, 1.6 s, or Adjustable Low Switch On Resistance 0.7 Normal, 7 in Backup 400 nA Standby Current Automatic Battery Backup Switching (ADM8696) Fast On-Board Gating of Chip Enable Signals (ADM8697) Voltage Monitor for Power Fail or Low Battery Warning Also Available in TSSOP Package One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 The ADM8696/ADM8697 is fabricated using an advanced epitaxial CMOS process combining low power consumption (0.7 mW), extremely fast Chip Enable gating (2 ns) and high re- liability. RESET assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is designed for mini- mal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor. GENERAL DESCRIPTION The ADM8696/ADM8697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection and power failure warning. The ADM8696/ADM8697 are available in 16-pin DIP and small outline packages (including TSSOP) and provide the following functions: 1. Power-On Reset output during power-up, power-down and brownout conditions. The RESET voltage threshold is adjustable using an external voltage divider. The RESET out- put remains operational with VCC as low as 1 V. 2. A Reset pulse if the optional watchdog timer has not been toggled within specified time. 3. Separate watchdog timeout and low line status outputs. 4. Adjustable reset and watchdog timeout periods. 5. A 1.3 V threshold detector for power fail warning, low battery detection or to monitor a power supply other than VCC. 6. Battery backup switching for CMOS RAM, CMOS micro- processor or other low power logic (ADM8696). 7. Write protection of CMOS RAM or EEPROM (ADM8697). ©1997-2010 Analog Devices, Inc. All rights reserved. REV. A APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring Qualified for Automotive Applications |
Podobny numer części - ADM8697_15 |
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Podobny opis - ADM8697_15 |
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