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TMP451-Q1 Datasheet(PDF) 19 Page - Texas Instruments

No. de pieza TMP451-Q1
Descripción Electrónicos  TMP451-Q1 짹1째C Remote and Local Temperature Sensor with 管-Factor and Offset Correction, Series-Resistance Cancellation, and Programmable Digital Filter
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TMP451-Q1
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SLOS877 – OCTOBER 2014
7.6.1.4 Configuration Register
The configuration register sets the temperature range, the ALERT/THERM modes, and controls the shutdown
mode. The configuration register is set by writing to pointer address 09h, and read by reading from pointer
address 03h. Table 5 summarizes the bits of configuration register.
Table 5. Configuration Register Bit Descriptions
CONFIGURATION REGISTER (READ = 03h, WRITE = 09h, POR = 00h)
BIT NUMBER
NAME
FUNCTION
POWER-ON RESET VALUE
0 = ALERT Enabled
7
MASK1
0
1 = ALERT Masked
0 = Run
6
SD
0
1 = Shut down
0 = ALERT
5
ALERT/THERM2
0
1 = THERM2
4:3
Reserved
0
0 = 0°C to +127°C
2
RANGE
0
1 = –64°C to +191°C
1:0
Reserved
0
MASK1 (bit 7) of the configuration register masks the ALERT output. If MASK1 is 0 (default), the ALERT output
is enabled. If MASK1 is set to 1, the ALERT output is disabled. This configuration applies only if the value of
ALERT/THERM2 (bit 5) is 0 (that is, pin 6 is configured as the ALERT output). If pin 6 is configured as the
THERM2 output, the value of the MASK1 bit has no effect.
The shutdown bit (SD, bit 6) enables or disables the temperature-measurement circuitry. If SD = 0 (default), the
TMP451-Q1 device converts continuously at the rate set in the conversion rate register. When SD is set to 1, the
TMP451-Q1 device stops converting when the current conversion sequence is complete and enters a shutdown
mode. When SD is set to 0 again, the TMP451-Q1 resumes continuous conversions. When SD = 1, a single
conversion can be started by writing to the one-shot start register. See the One-Shot Start Register section for
more information.
ALERT/THERM2 (bit 5) sets the configuration of pin 6. If the ALERT/THERM2 bit is 0 (default), then pin 6 is
configured as the ALERT output; if it is set to 1, then pin 6 is configured as the THERM2 output.
The temperature range is set by configuring RANGE (bit 2) of the configuration register. Setting this bit low
(default) configures the TMP451-Q1 device for the standard measurement range (0°C to 127°C); temperature
conversions are stored in the standard binary format. Setting bit 2 high configures the TMP451-Q1 device for the
extended measurement range (–64°C to 191°C); temperature conversions are 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.
Copyright © 2014, Texas Instruments Incorporated
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