ADT75ARZ Analog Devices Inc, ADT75ARZ Datasheet
ADT75ARZ
Specifications of ADT75ARZ
Available stocks
Related parts for ADT75ARZ
ADT75ARZ Summary of contents
Page 1
FEATURES 12-bit temperature-to-digital converter B grade accuracy ±1.0°C from 0°C to 70°C A grade accuracy ±2.0°C from –25°C to +100°C 2 SMBus/I C-compatible interface Operation from −55°C to +125°C Operation from 5.5 V Overtemperature indicator Shutdown mode ...
Page 2
ADT75 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Product Highlights ........................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications ..................................................................................... 4 A Grade .......................................................................................... 4 B Grade .......................................................................................... 5 Timing Specifications ...
Page 3
GENERAL DESCRIPTION The ADT75 is a complete temperature monitoring system in 8-lead MSOP and SOIC packages. It contains a bandgap temperature sen- sor and 12-bit ADC to monitor and digitize the temperature to a resolution of 0.0625°C. The ADT75 is ...
Page 4
ADT75 SPECIFICATIONS A GRADE 3 5.5 V. All specifications for −55°C to +125°C, unless otherwise noted. A MIN MAX DD Table 1. Parameter TEMPERATURE SENSOR AND ADC Accuracy at V ...
Page 5
B GRADE 3 5.5 V. All specifications for −55°C to +125°C, unless otherwise noted. A MIN MAX DD Table 2. Parameter TEMPERATURE SENSOR AND ADC Accuracy 3.0 ...
Page 6
ADT75 TIMING SPECIFICATIONS AND DIAGRAM Measure the SDA and SCL timing with the input filters turned on to meet the fast mode I improves the transfer rate but has a negative affect on the EMC behavior of the part. T ...
Page 7
ABSOLUTE MAXIMUM RATINGS Table 4. Parameter V to GND DD SDA Input Voltage to GND SDA Output Voltage to GND SCL Input Voltage to GND OS/ALERT Output Voltage to GND Operating Temperature Range Storage Temperature Range Maximum Junction Temperature, T ...
Page 8
ADT75 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 2 1 SDA SMBus/I C Serial Data Input/Output. Serial data that is loaded into and read from the ADT75 registers is provided on this pin. ...
Page 9
TYPICAL PERFORMANCE CHARACTERISTICS 1.0 0.8 0.6 0 3.3V DD 0.2 0 –0.2 V –0.4 –0.6 –0.8 –1.0 –55 –35 – TEMPERATURE (°C) Figure 5. Temperature Accuracy at 3.3 V and 5 V 500 CONVERTING @ ...
Page 10
ADT75 THEORY OF OPERATION CIRCUIT INFORMATION The ADT75 is a 12-bit digital temperature sensor with the 12 acting as the sign bit. An on-board temperature sensor generates a voltage precisely proportional to absolute temperature that is compared to an internal ...
Page 11
Configuration register functions consist of Switching between normal operation and full power-down. Switching between comparator and interrupt event modes. Setting the OS/ALERT pin active polarity. Setting the number of faults that activate the OS/ALERT pin. ...
Page 12
ADT75 ONE-SHOT MODE Setting Bit D5 of the configuration register enables the one-shot mode. When this mode is enabled, the ADT75 goes immedi- ately into shutdown mode and the current consumption is reduced to typically 3 μA when V is ...
Page 13
REGISTERS The ADT75 contains six registers: four are data registers, one is the address pointer register, and the final register is the one-shot register. The configuration register is the only data register that is 8 bits wide while the rest ...
Page 14
ADT75 Temperature Value Register This 16-bit read only register stores the temperature measured by the internal temperature sensor. The temperature is stored in twos complement format with the MSB being the temperature sign bit. When reading from this register, the ...
Page 15
Table 11. Bit Function D0 Shutdown Bit. Setting this bit to 1 puts the ADT75 into shutdown mode. All circuitry except the SMBus/I down. To power up the part again, write 0 to this bit. Shutdown D1 This bit selects ...
Page 16
ADT75 SERIAL INTERFACE Control of the ADT75 is carried out via the SMBus/I compatible serial interface. The ADT75 is connected to this bus as a slave and is under the control of a master device. 2 Figure 13 shows a ...
Page 17
WRITING DATA Depending on the register being written to, there are two different writes for the ADT75. Writing to the Address Pointer Register for a Subsequent Read In order to read data from a particular register, the address pointer register ...
Page 18
ADT75 1 SCL SDA START BY MASTER FRAME 1 SERIAL BUS ADDRESS BYTE 1 SCL (CONTINUED) SDA (CONTINUED) D15 D14 D13 Figure 16. Writing to the Address Pointer Register Followed by Two Bytes of Data ...
Page 19
OS/ALERT OUTPUT OVERTEMPERATURE MODES The ADT75 has two overtemperature modes, comparator mode and interrupt mode. The OS/ALERT pin defaults on power pin; the comparator mode is the default power up overtemperature mode. The OS/ALERT output pin ...
Page 20
ADT75 SMBus ALERT The OS/ALERT pin can behave as a SMBus alert pin when the SMBus alert function is enabled by setting Bit D7 in the configuration register. The interrupt mode must also be selected (Bit D1 in the configuration ...
Page 21
APPLICATION INFORMATION THERMAL RESPONSE TIME The time required for a temperature sensor to settle to a specified accuracy is a function of the thermal mass of the sensor and the thermal conductivity between the sensor and the object being sensed. ...
Page 22
ADT75 TEMPERATURE MONITORING The ADT75 is ideal for monitoring the thermal environment within electronic equipment. For example, the surface-mounted package accurately reflects the exact thermal conditions that affect nearby integrated circuits. The ADT75 measures and converts the temperature at the ...
Page 23
... ADT75ARMZ-REEL7 –55°C to +125°C ADT75ARMZ-REEL –55°C to +125°C ADT75ARZ –55°C to +125°C ADT75ARZ-REEL7 –55°C to +125°C ADT75ARZ-REEL –55°C to +125°C ADT75BRMZ –55°C to +125°C ADT75BRMZ-REEL7 –55°C to +125°C ADT75BRMZ-REEL –55°C to +125°C EVAL-ADT75EBZ RoHS Compliant Part ...
Page 24
ADT75 NOTES 2 Purchase of licensed I C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I 2 Rights to use these components system, ...