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TMP105YZC датащи(PDF) 7 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
номер детали TMP105YZC
подробное описание детали  Digital Temperature Sensor with Two-Wire Interface
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производитель  BURR-BROWN [Burr-Brown (TI)]
домашняя страница  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

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TMP105
SLLS648B − FEBRUARY 2005 − REVISED JANUARY 2006
www.ti.com
7
CONVERTER RESOLUTION (R1/R0)
The Converter Resolution bits control the resolution of the
internal analog-to-digital (A/D) converter. This control
allows the user to maximize efficiency by programming for
higher 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 TMP105
ONE-SHOT (OS)
The
TMP105
features
a
One-Shot
Temperature
Measurement Mode. When the device is in Shutdown
Mode, writing a ‘1’ to the OS bit starts a single temperature
conversion. The device will return to the shutdown state at
the completion of the single conversion. This option is
useful to reduce power consumption in the TMP105 when
continuous temperature monitoring is not required. When
the Configuration Register is read, the OS always reads
zero.
HIGH AND LOW LIMIT REGISTERS
In Comparator Mode (TM = 0), the ALERT pin of the
TMP105 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 remains 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 until the device successfully responds to the
SMBus Alert Response address. The ALERT pin clears 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 or a successful response to the SMBus Alert
Response address. When the ALERT pin clears, 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 reset also
clears 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 TMP105 operates only as a slave device 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 TMP105 supports the transmission
protocol for fast (1kHz to 400kHz) mode. All data bytes are
transmitted MSB first.


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