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TMP112AIDRLR Arkusz danych(PDF) 7 Page - Texas Instruments

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Numer części TMP112AIDRLR
Szczegółowy opis  High-Accuracy, Low-Power, Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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Strona internetowa  http://www.ti.com
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TMP112AIDRLR Arkusz danych(HTML) 7 Page - Texas Instruments

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POINTER REGISTER
TEMPERATURE REGISTER
I/O
Control
Interface
SCL
SDA
Temperature
Register
Configuration
Register
T
LOW
Register
T
HIGH
Register
Pointer
Register
TMP112
www.ti.com ......................................................................................................................................................... SBOS473B – MARCH 2009 – REVISED JUNE 2009
Figure 11 shows the internal register structure of the
The
Temperature
Register
of
the
TMP112
is
TMP112. The 8-bit Pointer Register of the device is
configured
as
a
12-bit,
read-only
register
used to address a given data register. The Pointer
(Configuration Register EM bit = '0'; see the Extended
Register uses the two LSBs (see Table 11) to identify
Mode section), or as a 13-bit, read-only register
which of the data registers should respond to a read
(Configuration Register EM bit = '1') that stores the
or write command. Table 1 identifies the bits of the
output of the most recent conversion. Two bytes must
Pointer Register byte. During a write command, P2
be read to obtain data, and are described in Table 3
through P7 must always be '0'. Table 2 describes the
and Table 4. Note that byte 1 is the most significant
pointer address of the registers available in the
byte (MSB), followed by byte 2, the least significant
TMP112. The power-up reset value of P1/P0 is '00'.
byte (LSB). The first 12 bits (13 bits in Extended
By default, the TMP112 reads the temperature on
mode) are used to indicate temperature. The least
power-up.
significant byte does not have to be read if that
information is not needed. The data format for
temperature is summarized in Table 5 and Table 6.
One LSB equals 0.0625°C. Negative numbers are
represented in binary twos complement format.
Following
power-up
or
reset,
the
Temperature
Register reads 0°C until the first conversion is
complete. Bit D0 of byte 2 indicates Normal mode
(EM bit = '0') or Extended mode (EM bit = '1'), and
can
be
used
to
distinguish
between
the
two
temperature register data formats. The unused bits in
the Temperature Register always read '0'.
Table 3. Byte 1 of Temperature Register(1)
D7
D6
D5
D4
D3
D2
D1
D0
T11
T10
T9
T8
T7
T6
T5
T4
(T12)
(T11)
(T10)
(T9)
(T8)
(T7)
(T6)
(T5)
(1) Extended mode 13-bit configuration shown in parentheses.
Table 4. Byte 2 of Temperature Register(1)
Figure 11. Internal Register Structure
D7
D6
D5
D4
D3
D2
D1
D0
T3
T2
T1
T0
0
0
0
0
Table 1. Pointer Register Byte
(T4)
(T3)
(T2)
(T1)
(T0)
(0)
(0)
(1)
P7
P6
P5
P4
P3
P2
P1
P0
(1) Extended mode 13-bit configuration shown in parentheses.
0
0
0
0
0
0
Register Bits
Table 2. Pointer Addresses
P1
P0
REGISTER
0
0
Temperature Register (Read Only)
0
1
Configuration Register (Read/Write)
1
0
TLOW Register (Read/Write)
1
1
THIGH Register (Read/Write)
Copyright © 2009, Texas Instruments Incorporated
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