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TMP451 Datasheet(PDF) 9 Page - Texas Instruments

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Part # TMP451
Description  짹1째C Remote and Local Temperature Sensor with 管-Factor and Offset Correction
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP451 Datasheet(HTML) 9 Page - Texas Instruments

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TMP451
www.ti.com
SBOS686 – JUNE 2013
Both local and remote temperature data use two bytes for data storage. The high byte stores the temperature
with 1°C resolution. The second or low byte stores the decimal fraction value of the temperature and allows a
higher measurement resolution, as shown in Table 2. The measurement resolution for both the local and the
remote channels is 0.0625°C.
Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)
TEMPERATURE REGISTER LOW BYTE VALUE
(0.0625°C RESOLUTION)(1)
TEMP
(°C)
STANDARD AND EXTENDED BINARY
HEX
0
0000 0000
00
0.0625
0001 0000
10
0.1250
0010 0000
20
0.1875
0011 0000
30
0.2500
0100 0000
40
0.3125
0101 0000
50
0.3750
0110 0000
60
0.4375
0111 0000
70
0.5000
1000 0000
80
0.5625
1001 0000
90
0.6250
1010 0000
A0
0.6875
1011 0000
B0
0.7500
1100 0000
C0
0.8125
1101 0000
D0
0.8750
1110 0000
E0
0.9385
1111 0000
F0
(1) Resolution is 0.0625°C/count. All possible values are shown.
Standard Binary to Decimal Temperature Data Calculation Example
High-byte conversion (for example, 0111 0011):
Convert the right-justified binary high byte to hexadecimal.
From hexadecimal, multiply the first number by 160 = 1 and the second number by 161 = 16.
The sum equals the decimal equivalent.
0111 0011b
→ 73h → (3 × 160) + (7 × 161) = 115
Low-byte conversion (for example, 0111 0000):
To convert the left-justified binary low-byte to decimal, use bits 7 through 4 and ignore bits 3 through 0
because they do not affect the value of the number.
0111b
→ (0 × 1/2)1 + (1 × 1/2)2 + (1 × 1/2)3 + (1 × 1/2)4 = 0.4375
Standard Decimal to Binary Temperature Data Calculation Example
For positive temperatures (for example, +20°C):
(+20°C)/(+1°C/count) = 20
→ 14h → 0001 0100
Convert the number to binary code with 8-bit, right-justified format, and MSB = '0' to denote a positive sign.
+20°C is stored as 0001 0100
→ 14h.
For negative temperatures (for example, –20°C):
(|–20|)/(+1°C/count) = 20
→ 14h → 0001 0100
Generate the two's complement of a negative number by complementing the absolute value binary number
and adding 1.
–20°C is stored as 1110 1100
→ ECh.
Copyright © 2013, Texas Instruments Incorporated
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