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TMP400 Datasheet(PDF) 9 Page - Texas Instruments

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Part # TMP400
Description  짹1째C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMP400 Datasheet(HTML) 9 Page - Texas Instruments

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TEMPERATURE REGISTERS
LIMIT REGISTERS
STATUS REGISTER
TMP400
SBOS404 – DECEMBER 2007
byte
first)
to
pointer
address
0Bh.
The
local
temperature high limit is obtained by reading the high
The TMP400 has four 8-bit registers that hold
byte from pointer address 05h and the low byte from
temperature measurement results. Both the local
pointer address 16h. The power-on reset value of the
channel and the remote channel have a high byte
local temperature high limit is 7Fh/00h (+127
°C).
register that contains the most significant bits (MSBs)
of the temperature analog-to-digital converter (ADC)
Similarly, the local temperature low limit is set by
result, and a low byte register that contains the least
writing the high byte to pointer address 0Ch and
significant bits (LSBs) of the temperature ADC result.
writing the low byte to pointer address 17h, or by
The local channel high byte address is 00h; the local
using a single two-byte write command to pointer
channel low byte address is 15h. The remote channel
address 0Ch. The local temperature low limit is read
high byte is at address 01h; the remote channel low
by reading the high byte from pointer address 06h
byte address is 10h. These read-only registers are
and the low byte from pointer address 17h, or by
updated by the ADC each time a temperature
using a two-byte read from pointer address 06h. The
measurement is completed.
power-on reset value of the local temperature low
limit register is C9h/00h (–55
°C).
The TMP400 contains circuitry to assure that a low
byte register read command returns data from the
The remote temperature high limit is set by writing the
same ADC conversion as the immediately preceding
high byte to pointer address 0Dh and writing the low
high byte read command. This assurance remains
byte to pointer address 13h, or by using a two-byte
valid only until another register is read. For proper
write command to pointer address 0Dh. The remote
operation, the high byte of a temperature register
temperature high limit is obtained by reading the high
should be read first. The low byte register should be
byte from pointer address 07h and the low byte from
read in the next read command. The low byte register
pointer address 13h, or by using a two-byte read
may be left unread if the LSBs are not needed.
command from pointer address 07h. The power-on
Alternatively, the temperature registers may be read
reset value of the Remote Temperature High Limit
as a 16-bit register by using a single two-byte read
Register is 7Fh/00h (+127
°C).
command from address 00h for the local channel
The remote temperature low limit is set by writing the
result or from address 01h for the remote channel
high byte to pointer address 0Eh and writing the low
result. The high byte is output first, followed by the
byte to pointer address 14h, or by using a two-byte
low byte. Both bytes of this read operation are from
write to pointer address 0Eh. The remote temperature
the same ADC conversion. The power-on reset value
low limit is read by reading the high byte from pointer
of both temperature registers is 00h.
address 08h and the low byte from pointer address
14h, or by using a two-byte read from pointer address
08h. The power-on reset value of the Remote
Temperature Low Limit Register is C9h/00h (–55
°C).
The
TMP400
has
eight
registers
for
setting
comparator limits for both the local and remote
measurement channels. These registers have read
and write capability. The High and Low Limit
The TMP400 has a Status Register to report the state
Registers for both channels span two registers, as do
of the temperature comparators. Table 3 shows the
the temperature registers. The local temperature high
Status Register bits. The Status Register is read-only
limit is set by writing the high byte to pointer address
and is read by reading from pointer address 02h.
0Bh and writing the low byte to pointer address 16h,
or by using a single two-byte write command (high
Table 3. Status Register Format
STATUS REGISTER (Read = 02h, Write = NA)
BIT #
D7
D6
D5
D4
D3
D2
D1
D0
BIT NAME
BUSY
LHIGH
LLOW
RHIGH
RLOW
OPEN
POR VALUE
0(1)
0
0
0
0
0
0
0
(1)
The BUSY bit will change to ‘1’ almost immediately (<< 100
µs) following power-up, as the TMP400 begins the first temperature
conversion. It is high whenever the TMP400 converts a temperature reading.
Copyright © 2007, Texas Instruments Incorporated
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