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ADM13305-33ARZ-RL71 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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1 / 12 page Dual Processor Supervisors with Watchdog ADM13305 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved. FEATURES Dual supervisory circuits Supply voltage range of 2.7 V to 5.5 V Pretrimmed threshold options: 1.8 V, 2.5 V, 3.3 V, and 5 V Adjustable 0.6 V voltage reference Maximum supply current of 40 μA 140 ms (minimum) reset timeout Watchdog timer with 1.6 sec (typical) timeout RESET valid from VDD ≥ 1.1 V Push-pull RESET and RESET outputs 8-lead, narrow body SOIC package Temperature range: −40°C to +85°C APPLICATIONS Supervising DSPs/microcontrollers Industrial and portable equipment Wireless systems Notebook/desktop computers GENERAL DESCRIPTION The ADM13305 is a dual voltage supervisor designed to monitor two supplies and provide a reset signal to DSP and microprocessor-based systems. There are five models available, all of which feature a combination of internally pretrimmed undervoltage threshold options for monitoring 1.8 V, 2.5 V, 3.3 V, and 5 V supplies. There is also an adjustable input option with an undervoltage threshold voltage of 0.6 V. The ADM13305-18, ADM13305-25, and ADM13305-33 models have two internally fixed thresholds. The ADM13305-4 and ADM13305-5 offer one internally fixed threshold and one externally programmable threshold via a resistor string. See the Ordering Guide for a list of all available options. During power-up, RESET is asserted when the supply voltage exceeds 1.1 V. The device then monitors the SENSEv input pins and holds the RESET output low as long as either of the SENSEv inputs remains below the rising threshold voltage, VIT+. FUNCTIONAL BLOCK DIAGRAMS VDD 14kΩ R1 R2 R3 R4 1.25V RESET LOGIC + TIMER OSCILLATOR TRANSITION DETECTION WATCHDOG LOGIC + TIMER RESET ADM13305-33 ADM13305-25 ADM13305-18 SENSE1 SENSE2 GND WDI MR RESET Figure 1. VDD 14kΩ R1 R2 0.6V RESET LOGIC + TIMER OSCILLATOR TRANSITION DETECTION WATCHDOG LOGIC + TIMER RESET ADM13305-4 ADM13305-5 SENSE1 SENSE2 WDI MR RESET GND Figure 2. . Once the supplies monitored at the SENSEv inputs rise above their associated thresholds, the reset signal remains low for the reset timeout period before deasserting. Subsequently, if a voltage monitored by the SENSEv pins falls below its associ- ated falling threshold, VIT−, the RESET output asserts. The ADM13305 features both an active high RESET and an active low RESET output. As well as providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within the preset timeout period. A reset signal can also be asserted by an external push button through the manual reset input pin. The ADM13305 is available in an 8-lead, narrow body SOIC package. The device operates over the extended industrial temperature range of −40°C to +85°C. |
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