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AD7417ARUZ-REEL 데이터시트(PDF) 1 Page - Analog Devices |
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AD7417ARUZ-REEL 데이터시트(HTML) 1 Page - Analog Devices |
1 / 24 page 10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs AD7416/AD7417/AD7418 Rev. I Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©1998–2010 Analog Devices, Inc. All rights reserved. FEATURES 10-bit ADC with 15 μs and 30 μs conversion times Single and 4 single-ended analog input channels On-chip temperature sensor: −40°C to +125°C On-chip track-and-hold Overtemperature indicator Automatic power-down at the end of a conversion Wide operating supply range: 2.7 V to 5.5 V I2C-compatible serial interface Selectable serial bus address allows connection of up to 8 AD7416/AD7417 devices to a single bus AD7416 is a superior replacement for LM75 APPLICATIONS Data acquisition with ambient temperature monitoring Industrial process control Automotive Battery-charging applications Personal computers GENERAL DESCRIPTION The AD7417 and AD7418 are 10-bit, 4-channel and single-channel ADCs with an on-chip temperature sensor that can operate from a single 2.7 V to 5.5 V power supply. The devices contain a 15 μs successive approximation converter, a 5-channel multiplexer, a temperature sensor, a clock oscillator, a track-and-hold, and a reference (2.5 V). The AD7416 is a temperature-monitoring only device in an 8-lead package. The temperature sensor on the parts can be accessed via multip- lexer Channel 0. When Channel 0 is selected and a conversion is initiated, the resulting ADC code at the end of the conversion gives a measurement of the ambient temperature (±1°C @ 25°C). On-chip registers can be programmed with high and low tempera- ture limits, and an open-drain overtemperature indicator (OTI) output is provided, which becomes active when a programmed limit is exceeded. A configuration register allows programming of the sense of the OTI output (active high or active low) and its operating mode (comparator or interrupt). A programmable fault queue counter allows the number of out-of-limit measurements that must occur before triggering the OTI output to be set to prevent spurious triggering of the OTI output in noisy environments. FUNCTIONAL BLOCK DIAGRAMS SETPOINT COMPARATOR 10-BIT ANALOG-TO-DIGITAL CONVERTER AD7416 BAND GAP TEMPERATURE SENSOR ADDRESS POINTER REGISTER TEMPERATURE VALUE REGISTER CONFIGURATION REGISTER SERIAL BUS INTERFACE FAULT QUEUE COUNTER TOTI SETPOINT REGISTER THYST SETPOINT REGISTER 7 2 1 4 3 8 6 5 A0 GND OTI VDD SDA SCL A1 A2 Figure 1. AD7416 AD7417 13 2 3 4 5 12 11 A0 1 NC NC = NO CONNECT 16 NC 6 GND 15 CONVST TEMP SENSOR MUX REF 2.5V SAMPLING CAPACITOR CLOCK TOTI SETPOINT REGISTER A > B B DATA OUT I2C INTERFACE A CONTROL LOGIC AIN1 8 AIN2 9 AIN3 10 AIN4 VBALANCE OTI REFIN 14 VDD SCL SDA A1 A2 7 CHARGE DISTRIBUTION DAC Figure 2. AD7417 AD7418 1 2 3 6 4 GND 8 CONVST TEMP SENSOR MUX REF 2.5V SAMPLING CAPACITOR CLOCK TOTI SETPOINT REGISTER A > B B DATA OUT I2C INTERFACE A CONTROL LOGIC AIN VBALANCE OTI REFIN 7 VDD SCL SDA 5 CHARGE DISTRIBUTION DAC Figure 3. AD7418 |
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