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ADM800MAN bảng dữ liệu(PDF) 1 Page - Analog Devices |
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ADM800MAN bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 12 page REV. 0 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 ADM691A/ADM693A/ADM800L/M 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 © Analog Devices, Inc., 1996 Microprocessor Supervisory Circuits FUNCTIONAL BLOCK DIAGRAM CHIP ENABLE OUTPUT CONTROL VBATT VCC CEIN OSC IN OSC SEL WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) 1VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M) ADM691A/ADM693A ADM800L/ADM800M 1.25V WATCHDOG TIMER RESET & WATCHDOG TIMEBASE RESET & GENERATOR 4.65V1 BATT ON LOW LINE VOUT CEOUT RESET RESET WATCHDOG OUTPUT ( WDO) POWER FAIL OUTPUT (PFO) WATCHDOG TRANSITION DETECTOR FEATURES Low Power Consumption: Precision Voltage Monitor 2% Tolerance on ADM800L/M Reset Time Delay—200 ms, or Adjustable 1 A Standby Current Automatic Battery Backup Power Switching Fast Onboard Gating of Chip Enable Signals Also Available in TSSOP Package (ADM691A) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems Critical P Power Monitoring GENERAL DESCRIPTION The ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits offers 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 family of products provides an upgrade for the MAX691A/93A/800M family of products. All parts are available in 16-pin DIP and SO packages. The ADM691A is also available in a space-saving TSSOP package. The following functionality is provided: 1. Power-on reset output during power-up, power-down and brownout conditions. The circuitry remains operational with VCC as low as 1 V. 2. Battery backup switching for CMOS RAM, CMOS micro- processor or other low power logic. 3. A reset pulse if the optional watchdog timer has not been toggled within a specified time. 4. A 1.25 V threshold detector for power fail warning, low bat- tery detection, or to monitor a power supply other than +5 V. VBATT VCC CMOS RAM CEIN OSC IN OSC SEL BAT ON LOW LINE VOUT CEOUT RESET RESET PFO WDI VCC WDO I/O LINE NMI A0–A15 µP POWER µP ADDRESS DECODE ADM691A ADM693A ADM800L ADM800M GND PFI BATTERY 0.1µF +5V NC R2 R1 INPUT POWER 7805 SYSTEM STATUS INDICATORS Figure 1. Typical Application |
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