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ADT7301 Datasheet(PDF) 11 Page - Analog Devices |
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ADT7301 Datasheet(HTML) 11 Page - Analog Devices |
11 / 17 page ADT7301 Rev. B | Page 10 of 16 TEMPERATURE VALUE REGISTER The temperature value register is a 14-bit read-only register that stores the temperature reading from the ADC in 13-bit twos complement format plus a sign bit. The MSB (DB13) is the sign bit. The ADC can theoretically measure a 255°C temperature 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. Table 5. Temperature Data Format Temperature Digital Output DB13 … DB0 −40°C 11, 1011 0000 0000 −30°C 11, 1100 0100 0000 −25°C 11, 1100 1110 0000 −10°C 11, 1110 1100 0000 −0.03125°C 11, 1111 1111 1111 0°C 00, 0000 0000 0000 +0.03125°C 00, 0000 0000 0001 +10°C 00, 0001 0100 0000 +25°C 00, 0011 0010 0000 +50°C 00, 0110 0100 0000 +75°C 00, 1001 0110 0000 +100°C 00, 1100 1000 0000 +125°C 00, 1111 1010 0000 +150°C 01, 0010 1100 0000 Temperature Conversion Equations Positive Temperature = ADC Code(d)/32 Negative Temperature = (ADC Code(d)1 − 16384)/32 Negative Temperature = (ADC Code(d)2 − 8192)/32 –40°C –0.03125°C –30°C 11, 1111, 1111, 1111 11, 1100, 0100, 0000 11, 1011, 0000, 0000 TEMPERATURE (°C) 75°C 150°C 01, 0010, 1100, 0000 00, 1001, 0110, 0000 00, 0000, 0000, 0001 Figure 13. Temperature-to-Digital Transfer Function 1 ADC code uses all 14 bits of the data byte, including the sign bit. 2 DB13 (the sign bit) is removed from the ADC code. |
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