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TMP102AIDRLRG4 Datasheet(PDF) 9 Page - Texas Instruments

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Part # TMP102AIDRLRG4
Description  Low Power Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP102AIDRLRG4 Datasheet(HTML) 9 Page - Texas Instruments

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TMP102
www.ti.com
SBOS397C – AUGUST 2007 – REVISED OCTOBER 2012
CONVERTER RESOLUTION (R1/R0)
Both operational modes are represented in Figure 10.
Table 10 and Table 11 describe the format for the
R1/R0 are read-only bits. The TMP102 converter
THIGH and TLOW registers. Note that the most
resolution is set on start up to '11'. This sets the
significant byte is sent first, followed by the least
temperature register to a 12 bit-resolution.
significant byte. Power-up reset values for THIGH and
TLOW are: THIGH = +80°C and TLOW = +75°C. The
ONE-SHOT/CONVERSION READY (OS)
format of the data for THIGH and TLOW is the same as
for the Temperature Register.
The TMP102 features a One-Shot Temperature
Measurement mode. When the device is in Shutdown
Table 10. Bytes 1 and 2 of THIGH Register
(1)
mode, writing a ‘1’ to the OS bit starts a single
temperature conversion. During the conversion, the
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
OS bit reads '0'. The device returns to the shutdown
H11
H10
H9
H8
H7
H6
H5
H4
1
state at the completion of the single conversion. After
(H12)
(H11)
(H10)
(H9)
(H8)
(H7)
(H6)
(H5)
the conversion, the OS bit reads '1'. This feature is
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
useful
for
reducing
power
consumption
in
the
TMP102 when continuous temperature monitoring is
H3
H2
H1
H0
0
0
0
0
2
not required.
(H4)
(H3)
(H2)
(H1)
(H0)
(0)
(0)
(0)
As a result of the short conversion time, the TMP102
(1) Extended mode 13-bit configuration shown in parenthesis.
can achieve a higher conversion rate. A single
conversion typically takes 26ms and a read can take
Table 11. Bytes 1 and 2 of TLOW Register
(1)
place in less than 20
μs. When using One-Shot mode,
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
30 or more conversions per second are possible.
L11
L10
L9
L8
L7
L6
L5
L4
1
(L12)
(L11)
(L10)
(L9)
(L8)
(L7)
(L6)
(L5)
HIGH- AND LOW-LIMIT REGISTERS
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
In Comparator mode (TM = 0), the ALERT pin
L3
L2
L1
L0
0
0
0
0
becomes active when the temperature equals or
2
(L4)
(L3)
(L2)
(L1)
(L0)
(0)
(0)
(0)
exceeds
the
value
in
THIGH and generates a
consecutive number of faults according to fault bits
(1) Extended mode 13-bit configuration shown in parenthesis.
F1 and F0. The ALERT pin remains active until the
temperature falls below the indicated TLOW value for
BUS OVERVIEW
the same number of faults.
The device that initiates the transfer is called a
In Interrupt mode (TM = 1), the ALERT pin becomes
master, and the devices controlled by the master are
active when the temperature equals or exceeds the
slaves. The bus must be controlled by a master
value in THIGH for a consecutive number of fault
device that generates the serial clock (SCL), controls
conditions (as shown in Table 9). The ALERT pin
the bus access, and generates the START and STOP
remains active until a read operation of any register
conditions.
occurs, or the device successfully responds to the
To address a specific device, a START condition is
SMBus Alert Response address. The ALERT pin will
initiated, indicated by pulling the data-line (SDA) from
also be cleared if the device is placed in Shutdown
a high to low logic level while SCL is high. All slaves
mode. Once the ALERT pin is cleared, it becomes
on the bus shift in the slave address byte on the
active again only when temperature falls below TLOW,
rising edge of the clock, with the last bit indicating
and remains active until cleared by a read operation
whether a read or write operation is intended. During
of any register or a successful response to the
the ninth clock pulse, the slave being addressed
SMBus Alert Response address. Once the ALERT
responds
to
the
master
by
generating
an
pin is cleared, the above cycle repeats, with the
Acknowledge and pulling SDA low.
ALERT pin becoming active when the temperature
equals or exceeds THIGH. The ALERT pin can also be
Data transfer is then initiated and sent over eight
cleared by resetting the device with the General Call
clock pulses followed by an Acknowledge Bit. During
Reset command. This action also clears the state of
data transfer SDA must remain stable while SCL is
the internal registers in the device, returning the
high, because any change in SDA while SCL is high
device to Comparator mode (TM = 0).
will be interpreted as a START or STOP signal.
Once all data have been transferred, the master
generates a STOP condition indicated by pulling SDA
from low to high, while SCL is high.
Copyright © 2007–2012, Texas Instruments Incorporated
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