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參數(shù)資料
| 型號： | TMP122AMDBVTEP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO6 |
| 封裝： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 651K |
| 代理商： | TMP122AMDBVTEP |
TEMPERATURE REGISTER
CONFIGURATION REGISTER
SHUTDOWN MODE (SD)
SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com
Table 3. Pointer Addresses
P1
P0
REGISTER
0
Temperature Register (READ only)
0
1
Configuration Register (READ/WRITE)
1
0
TLOW Register (READ/WRITE)
1
THIGH Register (READ/WRITE)
The Temperature Register of the TMP122 is a 16-bit, signed read-only register that stores the output of the most
recent conversion. The TMP122 is specified for the temperature range of -55°C to 125°C with operation from
-55°C to 150°C. Up to 16 bits can be read to obtain data and are described in Table 4. The first 13 bits are used
to indicate temperature where bit D2 is 1, and D1, D0 are in a high impedance state. Data format for temperature
is summarized in Table 5. Following power-up or reset, the Temperature Register will read 0°C until the first
conversion is complete.
Table 4. Temperature Register
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
T12
T11
T10
T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
1
Z
Table 5. Temperature Data Format
TEMPERATURE
DIGITAL OUTPUT(1)
HEX
(°c)
(BINARY)
150
0100 1011 0000 0111
4B07
125
0011 1110 1000 0111
3E87
25
0000 1100 1000 0111
0C87
0.0625
0000 0000 0000 1111
000F
0
0000 0000 0000 0111
0007
-0.0625
1111 1111 1111 1111
FFFF
-25
1111 0011 1000 0111
F387
-55
1110 0100 1000 0111
E487
(1)
The last two bits are high impedance and are shown as 11 in the table.
The user can obtain 9, 10, 11, or 12 bits of resolution by addressing the Configuration Register and setting the
resolution bits accordingly. For 9-, 10-, or 11-bit resolution, the most significant bits in the Temperture Register
are used with the unused LSBs set to zero.
The Configuration Register is a 16-bit read/write register used to store bits that control the operational modes of
the temperature sensor. Read/write operations are performed MSB first. The format of the Configuration Register
for the TMP122 is shown in Table 6, followed by a break-down of the register bits. The power-up/reset value of
the Configuration Register bits R1/R0 equal 1/1, all other bits equal zero.
Table 6. Configuration Register
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
D1
D0
R1
R0
F1
F0
POL
TM1
TM0
0
1
0
The Shutdown Mode of the TMP122 can be used to shut down all device circuitry except the serial interface.
Shutdown mode occurs when the last 8 bits of the WRITE command are equal to 1, and will occur once the
current conversion is completed, reducing current consumption to less than 1
A. To take the part out of
shutdown, send any command or pattern after the 16-bit read with the last 8 bits not equal to one. Power on
default is in active mode.
8
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TMP122-EP
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