Datasheet ADT7310 (Analog Devices)

±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet ADT7310 FEATURES Thermal protection High performance Industrial process control Temperature accuracy Power system monitors ±0.5°C from −40°C to +105°C (2.7 V to 3.6 V) Hand-held applications ±0.4°C from −40°C to +105°C (3.0 V) GENERAL DESCRIPTION 16-bit temperature resolution: 0.0078°C
The ADT7310 is a high accuracy digital temperature sensor
Fast first temperature conversion on power-up of 6 ms
in a narrow SOIC package. It contains a band gap temperature
Easy implementation
reference and a 13-bit ADC to monitor and digitize the
No temperature calibration/correction required by user No linearity correction required
temperature to a 0.0625°C resolution. The ADC resolution,
Low power
by default, is set to 13 bits (0.0625 °C). This can be changed
Power saving 1 sample per second (SPS) mode
to 16 bits (0.0078 °C) by setting Bit 7 in the configuration
700 µW typical at 3.3 V in normal mode
register (Register Address 0x01).
7 µW typical at 3.3 V in shutdown mode
The ADT7310 is guaranteed to operate over supply voltages from
Wide operating ranges
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is
Temperature range: −55°C to +150°C
typical y 210 μA. The ADT7310 has a shutdown mode that
Voltage range: 2.7 V to 5.5 V
powers down the device and offers a shutdown current of
Programmable interrupts
typical y 2 μA. The ADT7310 is rated for operation over the
Critical overtemperature interrupt
−55°C to +150°C temperature range.
Overtemperature/undertemperature interrupt SPI-compatible interface
The CT pin is an open-drain output that becomes active when
8-lead narrow SOIC RoHS-compliant package
the temperature exceeds a programmable critical temperature
APPLICATIONS
limit. The default critical temperature limit is 147°C. The INT pin is also an open-drain output that becomes active when the
Medical equipment
temperature exceeds a programmable limit. The INT and CT
Environmental control systems
pins can operate in either comparator or interrupt mode.
Computer thermal monitoring FUNCTIONAL BLOCK DIAGRAM 1 SCLK ADT7310 ACE 2 INTERNAL DOUT RF E OSCILLATOR INTERNAL 3 NT DIN REFERENCE I I 6 CT P S 4 CS TCRIT TEMPERATURE Σ-Δ TEMPERATURE CONFIGURATION SENSOR MODULATOR 5 VALUE INT AND STATUS REGISTER REGISTERS THIGH T T HYST CRIT FILTER REGISTER REGISTER LOGIC 7 T GND LOW T T HIGH LOW REGISTER REGISTER 8 VDD
001 07789- Figure 1.
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Document Outline Features Applications General Description Functional Block Diagram Revision History Specifications SPI Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Circuit Information Converter Details Temperature Measurement One-Shot Mode 1 SPS Mode CT and INT Operation in One-Shot Mode Continuous Read Mode Shutdown Fault Queue Temperature Data Format Temperature Conversion Formulas 16-Bit Temperature Data Format 13-Bit Temperature Data Format 10-Bit Temperature Data Format 9-Bit Temperature Data Format Registers Status Register Configuration Register Temperature Value Register ID Register TCRIT Setpoint Register THYST Setpoint Register THIGH Setpoint Register TLOW Setpoint Register Serial Interface SPI Command Byte Writing Data Reading Data Interfacing to DSPs or Microcontrollers Serial Interface Reset INT and CT Outputs Undertemperature and Overtemperature Detection Comparator Mode Interrupt Mode Applications Information Thermal Response Time Supply Decoupling Temperature Monitoring Outline Dimensions Ordering Guide