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TMP175AIDGKT Arkusz danych(PDF) 7 Page - Texas Instruments

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Numer części TMP175AIDGKT
Szczegółowy opis  Digital Temperature Sensor with Two-Wire Interface
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

TMP175AIDGKT Arkusz danych(HTML) 7 Page - Texas Instruments

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TMP175
TMP75
SBOS288J − JANUARY 2004 − REVISED DECEMBER 2007
www.ti.com
7
resolution or faster conversion time. Table 8 identifies the
Resolution Bits and the relationship between resolution
and conversion time.
R1
R0
RESOLUTION
CONVERSION TIME
(typical)
0
0
9 Bits (0.5
°C)
27.5ms
0
1
10 Bits (0.25
°C)
55ms
1
0
11 Bits (0.125
°C)
110ms
1
1
12 Bits (0.0625
°C)
220ms
Table 8. Resolution of the TMP175 and TMP75
ONE-SHOT (OS)
The TMP175 and TMP75 feature a One-Shot Temperature
Measurement Mode. When the device is in Shutdown
Mode, writing a ‘1’ to the OS bit will start a single
temperature conversion. The device will return to the
shutdown state at the completion of the single conversion.
This is useful to reduce power consumption in the TMP175
and TMP75 when continuous temperature monitoring is
not required. When the configuration register is read, the
OS will always read zero.
HIGH AND LOW LIMIT REGISTERS
In Comparator Mode (TM = 0), the ALERT pin of the
TMP175
and
TMP75
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 (TM = 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, or the device successfully responds to the SMBus
Alert Response Address. 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 will become
active and remain active until cleared by a read operation
of any register or a successful response to the SMBus
Alert Response Address. Once the ALERT pin is cleared,
the above cycle will repeat, with the ALERT pin becoming
active when the temperature equals or exceeds THIGH.
The ALERT pin can also be cleared by resetting the device
with the General Call Reset command. This will also clear
the state of the internal registers in the device returning the
device to Comparator Mode (TM = 0).
Both operational modes are represented in Figure 3.
Table 9 and Table 10 describe the format for the THIGH and
TLOW registers. Note that the most significant byte is sent
first, followed by the least significant byte. 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.
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
1
H11
H10
H9
H8
H7
H6
H5
H4
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
2
H3
H2
H1
H0
0
0
0
0
Table 9. Bytes 1 and 2 of THIGH Register
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
1
L11
L10
L9
L8
L7
L6
L5
L4
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
2
L3
L2
L1
L0
0
0
0
0
Table 10. Bytes 1 and 2 of TLOW Register
All 12 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.
SERIAL INTERFACE
The TMP175 and TMP75 operate only as slave devices on
the Two-Wire bus and SMBus. Connections to the bus are
made via the open-drain I/O lines SDA and SCL. The SDA
and SCL pins feature integrated spike suppression filters
and Schmitt triggers to minimize the effects of input spikes
and bus noise. The TMP175 and TMP75 both support the
transmission protocol for fast (1kHz to 400kHz) and
high-speed (1kHz to 3.4MHz) modes. All data bytes are
transmitted MSB first.
SERIAL BUS ADDRESS
To communicate with the TMP175 and TMP75, the master
must first address slave devices via a slave address byte.
The slave address byte consists of seven address bits,
and a direction bit indicating the intent of executing a read
or write operation.


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