EVAL-ADT7301EBZ Analog Devices Inc, EVAL-ADT7301EBZ Datasheet - Page 10

• Manufacturer Part Number: EVAL-ADT7301EBZ
• Description: Evaluation Board I.c.
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADT7301EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 150°C
• Interface: SPI Serial
• Sensitivity: ±0.5°C
• Voltage - Supply: 2.7 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: ADT7301
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7301
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
−40°C
−30°C
−25°C
−10°C
−0.03125°C
0°C
+0.03125°C
+10°C
+25°C
+50°C
+75°C
+100°C
+125°C
+150°C
Digital Output DB13 … DB0
11, 1011 0000 0000
11, 1100 0100 0000
11, 1100 1110 0000
11, 1110 1100 0000
11, 1111 1111 1111
00, 0000 0000 0000
00, 0000 0000 0001
00, 0001 0100 0000
00, 0011 0010 0000
00, 0110 0100 0000
00, 1001 0110 0000
00, 1100 1000 0000
00, 1111 1010 0000
01, 0010 1100 0000
Rev. A | Page 10 of 16
Temperature Conversion Equations
Positive Temperature = ADC Code(d)/32
Negative Temperature = (ADC Code(d)
Negative Temperature = (ADC Code(d)
1
2
ADC code uses all 14 bits of the data byte, including the sign bit.
DB13 (the sign bit) is removed from the ADC code.
01, 0010, 1100, 0000
–40°C
00, 1001, 0110, 0000
00, 0000, 0000, 0001
–30°C
–0.03125°C
Figure 13. Temperature-to-Digital Transfer Function
11, 1111, 1111, 1111
11, 1100, 0100, 0000
11, 1011, 0000, 0000
TEMPERATURE (°C)
75°C
1
2
− 16384)/32
− 8192)/32
150°C