Datasheet AD7414, AD7415 (Analog Devices)

±0.5°C Accurate, 10-Bit Digital Temperature Sensors in SOT-23 Data Sheet AD7414/ AD7415 FUNCTIONAL BLOCK DIAGRAM FEATURES 10-bit temperature-to-digital converter BAND GAP 10-BIT GND TEMPERATURE ANALOG-DIGITAL Temperature range: −40°C to +125°C SENSOR CONVERTER Typical accuracy of ±0.5°C at +40°C VDD CONFIGURATION SMBus/I2C®-compatible serial interface REGISTER TEMPERATURE VALUE 3 μA power-down current REGISTER THIGH SETPOINT REGISTER Temperature conversion time: 29 μs typ T SETPOINT ALERT Space-saving 6-lead (AD7414) and 5-lead (AD7415) LOW SETPOINT REGISTER COMPARATOR SOT-23 packages Pin selectable addressing via AS SCL SMBus/I2C INTERFACE Overtemperature indicator (AD7414 Only) AS SDA SMBus alert function (AD7414 only) AD7414 4 versions allow 8 I2C addresses (AD7414) AD7415 2 versions allow 6 I2C addresses (AD7415) BAND GAP 10-BIT TEMPERATURE ANALOG-DIGITAL GND V APPLICATIONS DD SENSOR CONVERTER Hard disk drives TEMPERATURE Personal computers CONFIGURATION VALUE REGISTER REGISTER Electronic test equipment AS Office equipment SCL Domestic appliances SMBus/I2C INTERFACE SDA
001
Process control
02463-
Cellular phones
Figure 1.
GENERAL DESCRIPTION
limit is exceeded. A configuration register allows programming of the state of the ALERT output (active high or active low). This The AD7414/AD7415 are complete temperature monitoring output can be used as an interrupt or as an SMBus alert. systems in 6-lead and 5-lead SOT-23 packages. They contain a band gap temperature sensor and a 10-bit ADC to monitor and
PRODUCT HIGHLIGHTS
digitize the temperature reading to a resolution of 0.25°C. 1. On-chip temperature sensor. The sensor allows an accurate The AD7414/AD7415 provide a 2-wire serial interface that is measurement of the ambient temperature to be made. It is compatible with SMBus and I2C interfaces. The parts come in four capable of ±0.5°C temperature accuracy. versions: the AD7414/AD7415-0, AD7414/AD7415-1, AD7414-2, 2. SMBus/I2C-compatible serial interface. The interface and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1 offers pin selectable choice of three addresses per version versions provide a choice of three different SMBus addresses for of the AD7414/AD7415, eight address options in total for each version. All four AD7414 versions give the possibility of eight the AD7414, and six in total for the AD7415. different I2C addresses while the two AD7415 versions allow up to 3. Supply voltage of 2.7 V to 5.5 V. six I2C addresses to be used. 4. Space-saving 5-lead and 6-lead SOT-23 packages. The AD7414/AD7415’s 2.7 V supply voltage, low supply current, 5. 10-bit temperature reading to 0.25°C resolution. serial interface, and small package size make them ideal for a 6. Overtemperature indicator. This indicator can be software variety of applications, including personal computers, office disabled. It is used as an interrupt of SMBus alert. equipment, cellular phones, and domestic appliances. 7. One-shot and automatic temperature conversion rates. In the AD7414, on-chip registers can be programmed with high and low temperature limits, and an open-drain overtemperature indicator output (ALERT) becomes active when a programmed
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS THEORY OF OPERATION CIRCUIT INFORMATION FUNCTIONAL DESCRIPTION MEASUREMENT TECHNIQUE TEMPERATURE DATA FORMAT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER (ADDRESS 0x01) TEMPERATURE VALUE REGISTER (ADDRESS 0x00) AD7414 THIGH REGISTER (ADDRESS 0X02) AD7414 TLOW REGISTER (ADDRESS 0x03) SERIAL INTERFACE SERIAL BUS ADDRESS WRITE MODE Writing to the Address Pointer Register for a Subsequent Read Writing a Single Byte of Data to the Configuration Register, THIGH Register, or TLOW Register READ MODE SMBUS ALERT POWER-ON DEFAULTS OPERATING MODES Mode 1 Mode 2 POWER VS. THROUGHPUT Mode 1 Mode 2 MOUNTING THE AD7414/AD7415 SUPPLY DECOUPLING TEMPERATURE ACCURACY VS. SUPPLY TYPICAL TEMPERATURE ERROR GRAPH OUTLINE DIMENSIONS ORDERING GUIDE