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TMP411-Q1 Datasheet(PDF) 12 Page - Texas Instruments

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Part # TMP411-Q1
Description  Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMP411-Q1 Datasheet(HTML) 12 Page - Texas Instruments

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TMP411
SBOS383C − DECEMBER 2006 − REVISED MAY 2008
www.ti.com
12
CONFIGURATION REGISTER
The Configuration Register sets the temperature range,
controls shutdown mode, and determines how the
ALERT/THERM2
pin
functions.
The
Configuration
Register is set by writing to pointer address 09h and read
by reading from pointer address 03h.
The MASK bit (bit 7) enables or disables the ALERT pin
output if AL/TH = 0. If AL/TH = 1 then the MASK bit has no
effect. If MASK is set to ‘0’, the ALERT pin goes low when
one of the temperature measurement channels exceeds
its high or low limits for the chosen number of consecutive
conversions. If the MASK bit is set to ‘1’, the TMP411
retains the ALERT pin status, but the ALERT pin will not
go low.
The shutdown (SD) bit (bit 6) enables or disables the
temperature measurement circuitry. If SD = 0, the TMP411
converts continuously at the rate set in the conversion rate
register. When SD is set to ‘1’, the TMP411 immediately
stops converting and enters a shutdown mode. When SD
is set to ‘0’ again, the TMP411 resumes continuous
conversions. A single conversion can be started when
SD = 1 by writing to the One-Shot Register.
The AL/TH bit (bit 5) controls whether the ALERT pin
functions in ALERT mode or THERM2 mode. If AL/TH = 0,
the ALERT pin operates as an interrupt pin. In this mode,
the ALERT pin goes low after the set number of
consecutive
out-of-limit
temperature
measurements
occur.
If AL/TH = 1, the ALERT/THERM2 pin implements a
THERM function (THERM2). In this mode, THERM2
functions similar to the THERM pin except that the local
high limit and remote high limit registers are used for the
thresholds. THERM2 goes low when either RHIGH or
LHIGH is set.
The temperature range is set by configuring bit 2 of the
Configuration Register. Setting this bit low configures the
TMP411 for the standard measurement range (0
°C to
+127
°C); temperature conversions will be stored in the
standard binary format. Setting bit 2 high configures the
TMP411 for the extended measurement range (−55
°C to
+150
°C); temperature conversions will be stored in the
extended binary format (see Table 1).
The remaining bits of the Configuration Register are
reserved and must always be set to ‘0’. The power-on reset
value for this register is 00h. Table 5 summarizes the bits
of the Configuration Register.
Table 5. Configuration Register Bit Descriptions
CONFIGURATION REGISTER (Read = 03h, Write = 09h, POR = 00h)
BIT
NAME
FUNCTION
POWER-ON RESET VALUE
7
MASK
0 = ALERT Enabled
1 = ALERT Masked
0
6
SD
0 = Run
1 = Shut Down
0
5
AL/TH
0 = ALERT Mode
1 = THERM Mode
0
4, 3
Reserved
0
2
Temperature Range
0 = 0
°C to +127°C
1 = −55
°C to +150°C
0
1, 0
Reserved
0


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