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TMP422AIDCNTG4 Scheda tecnica(PDF) 11 Page - Burr-Brown (TI)

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Il numero della parte TMP422AIDCNTG4
Spiegazioni elettronici  짹1째C Remote and Local TEMPERATURE SENSOR in SOT23-8
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CONFIGURATION REGISTER 2
TMP421
TMP422
SBOS398A – JULY 2007 – REVISED SEPTEMBER 2007
The remaining bits of the Configuration Register are
The
LEN
bit
enables
the
local
temperature
reserved and must always be set to '0'. The power-on
measurement channel. If LEN = '1', the local channel
reset
value
for
this
register
is
00h.
Table
5
is enabled; if LEN = '0', the local channel is disabled.
summarizes the bits of the Configuration Register.
The
REN
bit
enables
external
temperature
measurement channel 1 (connected to pins 1 and 2.)
If REN = '1', the external channel is enabled; if REN =
'0', the external channel is disabled.
Configuration
Register
2
(pointer
address
0Ah)
controls which temperature measurement channels
For the TMP422 only, the REN2 bit enables the
are enabled and whether the external channels have
second external measurement channel (connected to
the resistance correction feature enabled or not.
pins 3 and 4.) If REN2 = '1', the second external
channel is enabled; if REN = '0', the second external
The RC bit enables the resistance correction feature
channel is disabled.
for the external temperature channels. If RC = '1',
series resistance correction is enabled; if RC = '0',
The temperature measurement sequence is local
resistance
correction
is
disabled.
Resistance
channel, external channel 1, external channel 2,
correction should be enabled for most applications.
shutdown, and delay (to set conversion rate, if
However, disabling the resistance correction may
necessary). The sequence starts over with local
yield slightly improved temperature measurement
channel. If any of the channels are disabled, they are
noise performance, and reduce conversion time by
skipped in the sequence.
about 50%, which could lower power consumption
when conversion rates of two per second or less are
selected.
Table 5. Configuration Register 1 Bit Descriptions
CONFIGURATION REGISTER 1 (Read/Write = 09h, POR = 00h)
BIT
NAME
FUNCTION
POWER-ON RESET VALUE
7
Reserved
0
0 = Run
6
SD
0
1 = Shut Down
5, 4, 3
Reserved
0
0 = –55
°C to +127°C
2
Temperature Range
0
1 = –55
°C to +150°C
1, 0
Reserved
0
Table 6. Configuration Register 2 Bit Descriptions
CONFIGURATION REGISTER 2 (Read/Write = 0Ah, POR = 1Ch for TMP421; 3Ch for TMP422)
BIT
NAME
FUNCTION
POWER-ON RESET VALUE
7, 6
Reserved
0
0 = External Channel 2 Disabled
1 (TMP422)
5
REN2
1 = External Channel 2 Enabled
0 (TMP421)
0 = External Channel 1 Disabled
4
REN
1
1 = External Channel 1 Enabled
0 = Local Channel Disabled
3
LEN
1
1 = Local Channel Enabled
0 = Resistance Correction Disabled
2
RC
1
1 = Resistance Correction Enabled
1, 0
Reserved
0
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TMP421 TMP422


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