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TMP421AIDCNTG4 Fiches technique(PDF) 10 Page - Burr-Brown (TI)

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No de pièce TMP421AIDCNTG4
Description  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
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TEMPERATURE REGISTERS
STATUS REGISTER
CONFIGURATION REGISTER 1
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
The TMP421/22 have four 8-bit registers that hold
The
Status
Register
reports
the
state
of
the
temperature measurement results. Both the local
temperature
ADCs.
Table
4 shows
the
Status
channel and the remote channel have a high byte
Register bits. The Status Register is read-only, and is
register that contains the most significant bits (MSBs)
read accessing pointer address 08h.
of the temperature analog-to-digital converter (ADC)
The BUSY bit = '1' if the ADC is making a conversion;
result and a low byte register that contains the least
it is set to '0' if the ADC is not converting.
significant bits (LSBs) of the temperature ADC result.
The local channel high byte address is 00h; the local
channel low byte address is 10h. The remote channel
high byte is at address 01h; the remote channel low
Configuration Register 1 (pointer address 09h) sets
byte address is 11h. For the TMP422, the second
the temperature range and controls shutdown mode.
remote channel high byte address is 02h; the second
The Configuration Register is set by writing to pointer
remote channel low byte is 12h. These registers are
address 09h and read by reading from pointer
read-only and are updated by the ADC each time a
address 09h.
temperature measurement is completed.
The shutdown (SD) bit (bit 6) enables or disables the
The TMP421/22 contain circuitry to assure that a low
temperature measurement circuitry. If SD = '0', the
byte register read command returns data from the
TMP421/22 converts continuously at the rate set in
same ADC conversion as the immediately preceding
the conversion rate register. When SD is set to '1',
high byte read command. This assurance remains
the TMP421/22 stops converting when the current
valid only until another register is read. For proper
conversion sequence is complete and enters a
operation, the high byte of a temperature register
shutdown mode. When SD is set to '0' again, the
should be read first. The low byte register should be
TMP421/22 resumes continuous conversions. When
read in the next read command. The low byte register
SD = '1', a single conversion can be started by writing
may be left unread if the LSBs are not needed.
to the One-Shot Register.
Alternatively, the temperature registers may be read
The temperature range is set by configuring bit 2 of
as a 16-bit register by using a single two-byte read
the Configuration Register. Setting this bit low
command from address 00h for the local channel
configures
the
TMP421/22
for
the
standard
result, or from address 01h for the remote channel
measurement range (–55
°C to +127°C); temperature
result (02h for the second remote channel result).
conversions will be stored in the standard binary
The high byte is output first, followed by the low byte.
format. Setting bit 2 high configures the TMP421/22
Both bytes of this read operation are from the same
for the extended measurement range (–55
°C to
ADC conversion. The power-on reset value of all
+150
°C); temperature conversions will be stored in
temperature registers is 00h.
the extended binary format (see Table 1).
Table 4. Status Register Format
STATUS REGISTER (Read = 08h, Write = NA)
BIT #
D7
D6
D5
D4
D3
D2
D1
D0
BIT NAME
BUSY
0
0
0
0
0
0
0
POR VALUE
0(1)
0
0
0
0
0
0
0
(1)
FOR TMP421: The BUSY changes to '1' almost immediately (< 100
μs) following power-up, as the TMP421 begins the first temperature
conversion. It is high whenever the TMP421 converts a temperature reading.
FOR TMP422: The BUSY bit changes to '1' approximately 1ms following power-up. It is high whenever the TMP422 converts a
temperature reading.
10
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TMP421 TMP422


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