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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)： | 2/18頁 |
| 文件大?。?/td> | 651K |
| 代理商： | TMP122AMDBVTEP |
HIGH AND LOW LIMIT REGISTERS
CONVERTER RESOLUTION (R1/R0)
SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com
Table 8. Fault Settings
F1
F0
CONSECUTIVE FAULTS
0
1
0
1
2
1
0
4
1
6
In Comparator Mode (TM1/TM0 = 0/0), the ALERT Pin of the TMP122 becomes active when the temperature
equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and
F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value for the same
number of faults.
In Interrupt Mode (TM1/TM0 = 0/1) the ALERT pin becomes active when the temperature equals or exceeds
THIGH for a consecutive number of fault conditions. The ALERT pin remains active until a read operation of any
register occurs. The ALERT pin will also be cleared if the device is placed in Shutdown Mode. Once the ALERT
pin is cleared, it will only become active again by the temperature falling below TLOW. When the temperature falls
below TLOW, the ALERT pin becomes active and remains active until cleared by a read operation of any register.
Once the ALERT pin is cleared, the above cycle will repeat with the ALERT pin becoming active when the
temperature equals or exceeds THIGH.
In Interrupt/Comparator Mode (TM1/TM0 = 1/0), the ALERT Pin of the TMP122 becomes active when the
temperature equals or exceeds the value in THIGH and generates a consecutive number of faults according to
fault bits F1 and F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value
for the same number of faults and a communication with the device has occurred after that point.
Operational modes are represented in Figure 8. Table 9 and Table 10 describe the format for the THIGH and TLOW
registers. Power-up reset values for THIGH and TLOW are: THIGH = 80°C and TLOW = 75°C. The format of the data
for THIGH and TLOW is the same as for the Temperature Register. TABLE IX. THIGH Register.
All 13 bits for the Temperature, THIGH, and TLOW registers are used in the comparisons for the ALERT function for
all converter resolutions. The three LSBs in THIGH and TLOW can affect the ALERT output even if the converter is
configured for 9-bit resolution.
Table 9. THIGH Register
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
H12
H11
H10
H9
H8
H7
H6
H5
H4
H3
H2
H1
H0
1
0
Table 10. TLOW Register
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
L12
L11
L10
L9
L8
L7
L6
L5
L4
L3
L2
L1
L0
1
0
The Converter Resolution Bits control the resolution of the internal analog-to-digital (A/D) converter. This allows
the user to maximize efficiency by programming for higher resolution or faster conversion time. Table 11
identifies the resolution bits and the relationship between resolution and conversion time. The TMP122 has a
default resolution of 12 bits.
Table 11. Resolution
CONVERSION TIME
R1
R2
RESOLUTION
(TYPICAL)
0
9 bits (0.5°C) + sign
30 ms
0
1
10 bits (0.25°C) + sign
60 ms
1
0
11 bits (0.125°C) + sign
120 ms
1
12 bits (0.0625°C) + sign
240 ms
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TMP122-EP
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