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TMP442 Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte TMP442
Spiegazioni elettronici  TMP451-Q1 짹1째C Remote and Local Temperature Sensor with 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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Standard Binary to Decimal Temperature Data
Standard Decimal to Binary Temperature Data
TMP441
TMP442
SBOS425A – DECEMBER 2008 – REVISED MARCH 2009 .............................................................................................................................................. www.ti.com
Both local and remote temperature data use two
Calculation Example
bytes for data storage. The high byte stores the
temperature with 1°C resolution. The second or low
High byte conversion (for example, 0111 0011):
byte
stores
the
decimal
fraction
value
of
the
Convert the right-justified binary high byte to
temperature
and
allows
a
higher
measurement
hexadecimal.
resolution, as shown in Table 2. The measurement
From hexadecimal, multiply the first number by
resolution for both the local and remote channels is
160 = 1 and the second number by 161 = 16.
0.0625°C, and cannot be adjusted.
The sum equals the decimal equivalent.
Table 2. Decimal Fraction Temperature Data
0111 0011b
→ 73h → (3 × 160) + (7 × 161) = 115
Format (Local and Remote Temperature Low
Low byte conversion (for example, 0111 0000):
Bytes)
To convert the left-justified binary low-byte to
TEMPERATURE REGISTER LOW BYTE
decimal, use bits 7 through 4 and ignore bits 3
VALUE
(0.0625°C RESOLUTION)(1)
through 0 because they do not affect the value of
the number.
TEMP
STANDARD AND EXTENDED
(°C)
BINARY
HEX
0111b
(0
×
1/2)1
+
(1
×
1/2)2
+
0
0000 0000
00
(1 × 1/2)3 + (1 × 1/2)4 = 0.4375
0.0625
0001 0000
10
Note that the final numerical result is the sum of the
0.1250
0010 0000
20
high byte and low byte. In negative temperatures, the
0.1875
0011 0000
30
unsigned low byte adds to the negative high byte to
result in a value more than the high byte (for
0.2500
0100 0000
40
instance, –15 + 0.75 = –14.25, not –15.75).
0.3125
0101 0000
50
0.3750
0110 0000
60
0.4375
0111 0000
70
Calculation Example
0.5000
1000 0000
80
For positive temperatures (for example, +20°C):
0.5625
1001 0000
90
(+20°C)/(1°C/count) = 20
→ 14h → 0001 0100
0.6250
1010 0000
A0
Convert the number to binary code with 8-bit,
0.6875
1011 0000
B0
right-justified format, and MSB = '0' to denote a
0.7500
1100 0000
C0
positive sign.
0.8125
1101 0000
D0
+20°C is stored as 0001 0100
→ 14h.
0.8750
1110 0000
E0
For negative temperatures (for example, –20°C):
0.9375
1111 0000
F0
(|–20°C|)/(1°C/count) = 20
→ 14h → 0001 0100
(1) Resolution is 0.0625°C/count. All possible values are shown.
Generate the twos complement of a negative
number by complementing the absolute value
binary number and adding 1.
–20°C is stored as 1110 1100
→ ECh.
10
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TMP441 TMP442


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