Datasheet

TMP431
TMP432
www.ti.com SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013
Table 4. TMP432 Register Map (continued)
POINTER ADDRESS BIT DESCRIPTIONS
POWER-ON REGISTER
READ WRITE RESET (HEX) D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTIONS
N-factor Correction
28 28 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0
Remote2
Local Temperature
29 NA 00 T3 T2 T1 T0 0 0 0 0
(Low Byte)
35 35 00 0 0 0 0 0 R2HIGH R1HIGH LHIGH High Limit Status
36 36 00 0 0 0 0 0 R2LOW R1LOW LLOW Low Limit Status
37 37 00 0 0 0 0 0 R2THERM R1THERM LTHERM Therm Status
Local Temperature
3D 3D 00 LTH3 LTH2 LTH1 LTH0 0 0 0 0 High Limit (Low
Byte)
Local Temperature
3E 3E 00 LTL3 LTL2 LTL1 LTL0 0 0 0 0 Low Limit (Low
Byte)
Configuration
3F 3F 3C 0 0 REN2 REN LEN RC 0 0
Register2
NA FC 00 X
(3)
X X X X X X X Software Reset
FD NA 32 0 0 1 1 0 0 1 0 TMP432 Device ID
FE NA 55 0 1 0 1 0 1 0 1 Manufacturer ID
(3) X = Undefined. Writing any value to this register initiates a software reset; see the Software Reset section.
space
Pointer Register
The TMP431/32 contain circuitry to assure that a low
Figure 17 shows the internal register structure of the
byte register read command returns data from the
TMP431/32. The 8-bit Pointer Register is used to
same ADC conversion as the immediately preceding
address a given data register. The Pointer Register
high byte read command. This assurance remains
identifies which of the data registers should respond
valid only until another register is read. For proper
to a read or write command on the Two-Wire bus.
operation, the high byte of a temperature register
This register is set with every write command. A write
should be read first. The low byte register should be
command must be issued to set the proper value in
read in the next read command. The low byte register
the Pointer Register before executing a read
may be left unread if the LSBs are not needed.
command. Table 3 describes the pointer address of
Alternatively, the temperature registers may be read
the registers available in the TMP431. Table 4
as a 16-bit register by using a single two-byte read
describes the address of the registers available in the
command from address 00h for the local channel
TMP432. The power-on reset (POR) value of the
result, or from address 01h for the remote channel
Pointer Register is 00h (0000 0000b).
result (23h for the second remote channel result).
The high byte is output first, followed by the low byte.
Temperature Registers
Both bytes of this read operation are from the same
ADC conversion. The power-on reset value of both
The TMP431 has four 8-bit registers that hold
temperature registers is 00h.
temperature measurement results. The TMP432 has
six 8-bit registers that hold temperature measurement
Limit Registers
results. Both the local channel and the remote
channel have a high byte register that contains the
The TMP431/32 have registers for setting comparator
most significant bits (MSBs) of the temperature
limits for both the local and remote measurement
analog-to-digital converter (ADC) result and a low
channels. These registers have read and write
byte register that contains the least significant bits
capability. The High and Low Limit Registers for both
(LSBs) of the temperature ADC result. The local
channels span two registers, as do the temperature
channel high byte address for the TMP431/32 is 00h;
registers. The local temperature high limit is set by
the local channel low byte address is 15h for the
writing the high byte to pointer address 0Bh and
TMP431 and 29h for the TMP432. The remote
writing the low byte to pointer address 16h for the
channel high byte is at address 01h; the remote
TMP431 and 3Dh for the TMP432, or by using a
channel low byte address is 10h. For the TMP432,
single two-byte write command (high byte first) to
the second remote channel high byte address is 23h;
pointer address 0Bh.
the second remote channel low byte is 24h. These
registers are read-only and are updated by the ADC
each time a temperature measurement is completed.
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