Datasheet

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SBOS371A − AUGUST 2006 − REVISED OCTOBER 2007
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Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes)
REMOTE
TEMPERATURE
REGISTER
LOW BYTE VALUE
LOCAL
TEMPERATURE
REGISTER
LOW BYTE VALUE
0.06255C RESOLUTION 0.55C RESOLUTION 0.255C RESOLUTION 0.1255C RESOLUTION 0.06255C RESOLUTION
TEMP
(5C)
STANDARD
AND
EXTENDED
BINARY
HEX
STANDARD
AND
EXTENDED
BINARY
HEX
STANDARD
AND
EXTENDED
BINARY
HEX
STANDARD
AND
EXTENDED
BINARY
HEX
STANDARD
AND
EXTENDED
BINARY
HEX
0.0000 0000 0000 00 0000 0000 00 0000 0000 00 0000 0000 00 0000 0000 00
0.0625 0001 0000 10 0000 0000 00 0000 0000 00 0000 0000 00 0001 0000 10
0.1250 0010 0000 20 0000 0000 00 0000 0000 00 0010 0000 20 0010 0000 20
0.1875 0011 0000 30 0000 0000 00 0000 0000 00 0010 0000 20 0011 0000 30
0.2500 0100 0000 40 0000 0000 00 0100 0000 40 0100 0000 40 0100 0000 40
0.3125 0101 0000 50 0000 0000 00 0100 0000 40 0100 0000 40 0101 0000 50
0.3750 0110 0000 60 0000 0000 00 0100 0000 40 0110 0000 60 0110 0000 60
0.4375 0111 0000 70 0000 0000 00 0100 0000 40 0110 0000 60 0111 0000 70
0.5000 1000 0000 80 1000 0000 80 1000 0000 80 1000 0000 80 1000 0000 80
0.5625 1001 0000 90 1000 0000 80 1000 0000 80 1000 0000 80 1001 0000 90
0.6250 1010 0000 A0 1000 0000 80 1000 0000 80 1010 0000 A0 1010 0000 A0
0.6875 1011 0000 B0 1000 0000 80 1000 0000 80 1010 0000 A0 1011 0000 B0
0.7500 1100 0000 C0 1000 0000 80 1100 0000 C0 1100 0000 C0 1100 0000 C0
0.8125 1101 0000 D0 1000 0000 80 1100 0000 C0 1100 0000 C0 1101 0000 D0
0.8750 1110 0000 E0 1000 0000 80 1100 0000 C0 1110 0000 E0 1110 0000 E0
0.9375 1111 0000 F0 1000 0000 80 1100 0000 C0 1110 0000 E0 1111 0000 F0
REGISTER INFORMATION
The TMP401 contains multiple registers for holding
configuration information, temperature measurement
results, temperature comparator limits, and status
information. These registers are described in Figure 12
and Table 3.
POINTER REGISTER
Figure 12 shows the internal register structure of the
TMP401. The 8-bit Pointer Register is used to address a
given data register. The Pointer Register identifies which
of the data registers should respond to a read or write
command on the Two-Wire bus. This register is set with
every write command. A write command must be issued
to set the proper value in the Pointer Register before
executing a read command. Table 3 describes the pointer
address of the registers available in the TMP401. The
power-on reset (POR) value of the Pointer Register is 00h
(0000 0000b).
Hysteresis Register
Resolution Register
Configuration Register
Status Register
Consecutive Alert Register
One−Shot Register
Identification Registers
Conversion Rate Register
Local and Remote Limit Registers
Local and Remote Temperature Registers
SDA
SCL
Pointer Register
I/O
Control
Interface
Figure 12. Internal Register Structure