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AD7416 데이터시트(PDF) 1 Page - Analog Devices |
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AD7416 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 page REV. G AD7416/AD7417/AD7418 10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs (AD7417/AD7418) 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 10-Bit ADC with 15 s and 30 s Conversion Times Single and Four 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 I 2C® Compatible Serial Interface Selectable Serial Bus Address Allows Connection of up to Eight AD7416/AD7417s 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 FUNCTIONAL BLOCK DIAGRAMS VDD OTI GND SDA SCL FAULT QUEUE COUNTER SETPOINT COMPARATOR TOTI SETPOINT REGISTER THYST SETPOINT REGISTER TEMPERATURE VALUE REGISTER A0 A1 A2 CONFIGURATION REGISTER SERIAL BUS INTERFACE BAND GAP TEMPERATURE SENSOR 10-BIT ANALOG-DIGITAL CONVERTER ADDRESS POINTER REGISTER AD7416 CONTROL LOGIC A > B REFIN VDD OTI SCL SDA A2 A1 A0 CONVST AIN1 AIN2 AIN3 AIN4 TEMP SENSOR SAMPLING CAPACITOR VBALANCE CLOCK A B REF 2.5V CHARGE DISTRIBUTION DAC I2C INTERFACE MUX OVERTEMP REG NC NC GND DATA OUT NC = NO CONNECT AD7417 CONTROL LOGIC A > B VDD OTI SCL SDA AIN1 SAMPLING CAPACITOR VBALANCE CLOCK A B I2C INTERFACE MUX OVERTEMP REG GND DATA OUT TEMP SENSOR REFIN CONVST REF 2.5V CHARGE DISTRIBUTION DAC AD7418 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 oscilla- tor, 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 multi- plexer 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 tem- perature limits, and an open-drain overtemperature indicator (OTI) output is provided, which becomes active when a pro- grammed 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. (continued on page 7) |
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