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TMP422AIDCNT データシート(PDF) 11 Page - Texas Instruments

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部品番号 TMP422AIDCNT
部品情報  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TMP422AIDCNT データシート(HTML) 11 Page - Texas Instruments

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Standard Decimal to Binary Temperature Data
REGISTER INFORMATION
POINTER REGISTER
Standard Binary to Decimal Temperature Data
One-ShotStartRegister
ConfigurationRegisters
StatusRegister
IdentificationRegisters
N-FactorCorrectionRegisters
ConversionRateRegister
LocalandRemoteTemperatureRegisters
SDA
SCL
PointerRegister
I/O
Control
Interface
SoftwareReset
TMP421
TMP422
TMP423
SBOS398B – JULY 2007 – REVISED MARCH 2008
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
For positive temperatures (for example, +20
°C):
byte
stores
the
decimal
fraction
value
of
the
(+20
°C)/(+1°C/count) = 20 → 14h → 0001 0100
temperature
and
allows
a
higher
measurement
Convert the number to binary code with 8-bit,
resolution, as shown in Table 2. The measurement
right-justified format, and MSB = '0' to denote a
resolution for the both the local and remote channels
positive sign.
is 0.0625
°C, and is not adjustable.
+20
°C is stored as 0001 0100 → 14h.
Table 2. Decimal Fraction Temperature Data
For negative temperatures (for example, –20
°C):
Format (Local and Remote Temperature Low
(|–20|)/(+1
°C/count) = 20 → 14h → 0001 0100
Bytes)
Generate the two's complement of a negative
TEMPERATURE REGISTER LOW BYTE VALUE
(0.0625
°C RESOLUTION)
number by complementing the absolute value
TEMP
(
°C)
STANDARD AND EXTENDED BINARY
HEX
binary number and adding 1.
0
0000 0000
00
–20
°C is stored as 1110 1100 → ECh.
0.0625
0001 0000
10
0.1250
0010 0000
20
0.1875
0011 0000
30
The TMP421/22/23 contain multiple registers for
0.2500
0100 0000
40
holding
configuration
information,
temperature
0.3125
0101 0000
50
measurement results, and status information. These
0.3750
0110 0000
60
registers are described in Figure 14 and Table 3.
0.4375
0111 0000
70
0.5000
1000 0000
80
0.5625
1001 0000
90
Figure 14 shows the internal register structure of the
0.6250
1010 0000
A0
TMP421/22/23. The 8-bit Pointer Register is used to
0.6875
1011 0000
B0
address a given data register. The Pointer Register
0.7500
1100 0000
C0
identifies which of the data registers should respond
to a read or write command on the two-wire bus. This
0.8125
1101 0000
D0
register is set with every write command. A write
0.8750
1110 0000
E0
command must be issued to set the proper value in
0.9385
1111 0000
F0
the
Pointer
Register
before
executing
a
read
(1) Resolution is 0.0625
°C/count. All possible values are shown.
command. Table 3 describes the pointer address of
the TMP421/22/23 registers. The power-on reset
(POR) value of the Pointer Register is 00h (0000
Calculation Example
0000b).
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
Figure 14. Internal Register Structure
Note that the final numerical result is the sum of the
high byte and low byte. In negative temperatures, the
unsigned low byte adds to the negative high byte to
result in a value less than the high byte (for instance,
–15 + 0.75 = –14.25, not –15.75).
Copyright © 2007–2008, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Link(s): TMP421 TMP422 TMP423


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