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EVAL-AD7418EB

更新时间: 2024-11-30 21:53:27
品牌 Logo 应用领域
亚德诺 - ADI 传感器温度传感器
页数 文件大小 规格书
20页 291K
描述
10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)

EVAL-AD7418EB 数据手册

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10-Bit Digital Temperature Sensor (AD7416) and  
Four Single-Channel ADCs (AD7417/AD7418)  
AD7416/AD7417/AD7418  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
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  
10-BIT  
ANALOG-DIGITAL  
CONVERTER  
BAND GAP  
TEMPERATURE  
SENSOR  
AD7416  
Overtemperature Indicator  
TEMPERATURE  
VALUE  
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 Eight AD7416/AD7417s to a Single Bus  
AD7416 Is a Superior Replacement for LM75  
REGISTER  
SETPOINT  
COMPARATOR  
T
SETPOINT  
OTI  
ADDRESS  
POINTER  
REGISTER  
REGISTER  
V
DD  
T
SETPOINT  
HYST  
REGISTER  
OTI  
FAULT  
QUEUE  
COUNTER  
CONFIGURATION  
REGISTER  
GND  
SDA  
APPLICATIONS  
A0  
A1  
A2  
Data Acquisition with Ambient Temperature Monitoring  
Industrial Process Control  
Automotive  
SERIAL BUS  
INTERFACE  
SCL  
Battery-Charging Applications  
Personal Computers  
V
REF  
IN  
DD  
GENERAL DESCRIPTION  
A > B  
A
B
OTI  
OVERTEMP REG  
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.  
TEMP  
SENSOR  
CHARGE  
DISTRIBUTION  
DAC  
DATA OUT  
REF  
2.5V  
SCL  
SDA  
A
CONTROL  
LOGIC  
IN1  
CLOCK  
+
2
I C  
A
INTERFACE  
SAMPLING  
CAPACITOR  
IN2  
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.  
MUX  
A
IN3  
A
IN4  
AD7417  
V
BALANCE  
NC NC GND  
NC = NO CONNECT  
A0  
A1  
A2  
CONVST  
V
REF  
IN  
DD  
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)  
A > B  
OVERTEMP REG  
B
OTI  
A
TEMP  
SENSOR  
REF  
2.5V  
CHARGE  
DISTRIBUTION  
DAC  
DATA OUT  
A
MUX  
IN1  
SCL  
SDA  
CONTROL  
LOGIC  
CLOCK  
+
2
I C  
INTERFACE  
SAMPLING  
CAPACITOR  
AD7418  
V
BALANCE  
REV. G  
GND  
CONVST  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
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  
Fax: 781/326-8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  

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