Datasheet ADT7301 (Analog Devices) - 10
| Fabricante | Analog Devices |
| Descripción | ±1°C Accurate, 13-Bit, Digital Temperature Sensor |
| Páginas / Página | 16 / 10 — ADT7301. TEMPERATURE VALUE REGISTER. Temperature Conversion Equations. … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 286 Kb |
| Idioma del documento | Inglés |
ADT7301. TEMPERATURE VALUE REGISTER. Temperature Conversion Equations. 01, 0010, 1100, 0000. 75°C. 00, 1001, 0110, 0000
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ADT7301 TEMPERATURE VALUE REGISTER Temperature Conversion Equations
The temperature value register is a 14-bit read-only register that Positive Temperature = ADC Code(d)/32 stores the temperature reading from the ADC in 13-bit twos Negative Temperature = (ADC Code(d)1 − 16384)/32 complement format plus a sign bit. The MSB (DB13) is the sign Negative Temperature = (ADC Code(d)2 − 8192)/32 bit. The ADC can theoretically measure a 255°C temperature
01, 0010, 1100, 0000
span. The internal temperature sensor is guaranteed to a low value limit of −40°C and a high limit of +150°C. The temperature data format is shown in Table 5, which shows the temperature measurement range of the device (−40°C to +150°C). The typical performance curve is shown in Figure 11.
75°C 00, 1001, 0110, 0000 DIGITAL OUTPUT Table 5. Temperature Data Format Temperature Digital Output DB13 … DB0
−40°C 11, 1011 0000 0000
00, 0000, 0000, 0001
−30°C 11, 1100 0100 0000
–0.03125°C 11, 1111, 1111, 1111 TEMPERATURE (°C)
−25°C 11, 1100 1110 0000
–40°C 150°C
−10°C 11, 1110 1100 0000
–30°C 11, 1100, 0100, 0000
−0.03125°C 11, 1111 1111 1111 0°C 00, 0000 0000 0000
11, 1011, 0000, 0000
+0.03125°C 00, 0000 0000 0001 02884-0-006 +10°C 00, 0001 0100 0000 Figure 13. Temperature-to-Digital Transfer Function +25°C 00, 0011 0010 0000 1 ADC code uses all 14 bits of the data byte, including the sign bit. +50°C 00, 0110 0100 0000 2 DB13 (the sign bit) is removed from the ADC code. +75°C 00, 1001 0110 0000 +100°C 00, 1100 1000 0000 +125°C 00, 1111 1010 0000 +150°C 01, 0010 1100 0000 Rev. B | Page 10 of 16 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Revision History Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Converter Details Temperature Value Register Temperature Conversion Equations Serial Interface Read Operation Write Operation Applications Information Microprocessor Interfacing ADT7301-to-MC68HC11 Interface ADT7301-to-8051 Interface ADT7301-to-PIC16C6x/7x Interface ADT7301-to-ADSP-21xx Interface Mounting the ADT7301 Supply Decoupling Outline Dimensions Ordering Guide
ADT7301 TEMPERATURE VALUE REGISTER Temperature Conversion Equations
The temperature value register is a 14-bit read-only register that Positive Temperature = ADC Code(d)/32 stores the temperature reading from the ADC in 13-bit twos Negative Temperature = (ADC Code(d)1 − 16384)/32 complement format plus a sign bit. The MSB (DB13) is the sign Negative Temperature = (ADC Code(d)2 − 8192)/32 bit. The ADC can theoretically measure a 255°C temperature
01, 0010, 1100, 0000
span. The internal temperature sensor is guaranteed to a low value limit of −40°C and a high limit of +150°C. The temperature data format is shown in Table 5, which shows the temperature measurement range of the device (−40°C to +150°C). The typical performance curve is shown in Figure 11.
75°C 00, 1001, 0110, 0000 DIGITAL OUTPUT Table 5. Temperature Data Format Temperature Digital Output DB13 … DB0
−40°C 11, 1011 0000 0000
00, 0000, 0000, 0001
−30°C 11, 1100 0100 0000
–0.03125°C 11, 1111, 1111, 1111 TEMPERATURE (°C)
−25°C 11, 1100 1110 0000
–40°C 150°C
−10°C 11, 1110 1100 0000
–30°C 11, 1100, 0100, 0000
−0.03125°C 11, 1111 1111 1111 0°C 00, 0000 0000 0000
11, 1011, 0000, 0000
+0.03125°C 00, 0000 0000 0001 02884-0-006 +10°C 00, 0001 0100 0000 Figure 13. Temperature-to-Digital Transfer Function +25°C 00, 0011 0010 0000 1 ADC code uses all 14 bits of the data byte, including the sign bit. +50°C 00, 0110 0100 0000 2 DB13 (the sign bit) is removed from the ADC code. +75°C 00, 1001 0110 0000 +100°C 00, 1100 1000 0000 +125°C 00, 1111 1010 0000 +150°C 01, 0010 1100 0000 Rev. B | Page 10 of 16 Document Outline Features Applications Functional Block Diagram General Description Product Highlights Revision History Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Converter Details Temperature Value Register Temperature Conversion Equations Serial Interface Read Operation Write Operation Applications Information Microprocessor Interfacing ADT7301-to-MC68HC11 Interface ADT7301-to-8051 Interface ADT7301-to-PIC16C6x/7x Interface ADT7301-to-ADSP-21xx Interface Mounting the ADT7301 Supply Decoupling Outline Dimensions Ordering Guide