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TMP100NA250G4 Datenblatt(PDF) 6 Page - Texas Instruments

Teilenummer TMP100NA250G4
Bauteilbeschribung  Digital Temperature Sensor with I2C Interface
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

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TMP100
TMP101
SBOS231G − JANUARY 2002 − REVISED NOVEMBER 2007
www.ti.com
6
equal to zero. 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 3. Byte 1 of Temperature Register
D7
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
Table 4. Byte 2 of Temperature Register
D7
D6
D5
D4
D3
D2
D1
D0
T3
T2
T1
T0
0
0
0
0
Table 5. Temperature Data Format
TEMPERATURE
(
°C)
DIGITAL OUTPUT
(BINARY)
HEX
128
0111 1111 1111
7FF
127.9375
0111 1111 1111
7FF
100
0110 0100 0000
640
80
0101 0000 0000
500
75
0100 1011 0000
4B0
50
0011 0010 0000
320
25
0001 1001 0000
190
0.25
0000 0000 0100
004
0.0
0000 0000 0000
000
−0.25
1111 1111 1100
FFC
−25
1110 0111 0000
E70
−55
1100 1001 0000
C90
−128
1000 0000 0000
800
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 Temperature Register are
used with the unused LSBs set to zero.
CONFIGURATION REGISTER
The Configuration Register is an 8-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
TMP100 and TMP101 is shown in Table 6, followed by a
breakdown of the register bits. The power-up/reset value
of the Configuration Register is all bits equal to 0. The
OS/ALERT bit will read as 1 after power-up/reset.
Table 6. Configuration Register Format
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
1
OS/ALERT
R1
R0
F1
F0
POL
TM
SD
SHUTDOWN MODE (SD)
The Shutdown Mode of the TMP100 and TMP101 allows
the user to save maximum power by shutting down all
device circuitry other than the serial interface, which
reduces current consumption to less than 1
µA. For the
TMP100 and TMP101, Shutdown Mode is enabled when
the SD bit is 1. The device will shutdown once the current
conversion is completed. For SD equal to 0, the device will
maintain continuous conversion.
THERMOSTAT MODE (TM)
The Thermostat Mode bit of the TMP101 indicates to the
device whether to operate in Comparator Mode (TM = 0)
or Interrupt Mode (TM = 1). For more information on
comparator and interrupt modes, see the HIGH and LOW
Limit Registers section.
POLARITY (POL)
The Polarity Bit of the TMP101 allows the user to adjust the
polarity of the ALERT pin output. If POL = 0, the ALERT pin
will be active LOW, as shown in Figure 4. For POL = 1 the
ALERT pin will be active HIGH, and the state of the ALERT
pin is inverted.
Measured
Temperature
T
HIGH
TLOW
TMP101 ALERT PIN
(Comparator Mode)
POL = 0
TMP101 ALERT PIN
(Interrupt Mode)
POL = 0
TMP101 ALERT PIN
(Comparator Mode)
POL = 1
TMP101 ALERT PIN
(Interrupt Mode)
POL = 1
Read
Read
Time
Read
Figure 4. Output Transfer Function Diagrams
FAULT QUEUE (F1/F0)
A fault condition occurs when the measured temperature
exceeds the user-defined limits set in the THIGH and TLOW
Registers. Additionally, the number of fault conditions
required to generate an alert may be programmed using
the Fault Queue. The Fault Queue is provided to prevent
a false alert due to environmental noise. The Fault Queue
requires consecutive fault measurements in order to
trigger the alert function. If the temperature falls below
TLOW, prior to reaching the number of programmed
consecutive faults limit, the count is reset to 0. Table 7
defines the number of measured faults that may be
programmed to trigger an alert condition in the device.


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