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TMP112AIDRLR Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części TMP112AIDRLR
Szczegółowy opis  High-Accuracy, Low-Power, Digital Temperature Sensor With SMBus??Two-Wire Serial Interface in SOT563
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Strona internetowa  http://www.ti.com
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TMP112AIDRLR Arkusz danych(HTML) 9 Page - Texas Instruments

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CONFIGURATION REGISTER
CONVERSION RATE
EXTENDED MODE (EM)
Startup
Startof
Conversion
Delay
(1)
26ms
26ms
ALERT (AL Bit)
SHUTDOWN MODE (SD)
THERMOSTAT MODE (TM)
TMP112
www.ti.com ......................................................................................................................................................... SBOS473B – MARCH 2009 – REVISED JUNE 2009
The Configuration Register is a 16-bit read/write
The conversion rate bits, CR1 and CR0, configure the
register used to store bits that control the operational
TMP112 for conversion rates of 8Hz, 4Hz, 1Hz, or
modes
of
the
temperature
sensor.
Read/write
0.25Hz. The default rate is 4Hz. The TMP112 has a
operations are performed MSB first. The format and
typical conversion time of 26ms. To achieve different
power-up/reset values of the Configuration Register
conversion rates, the TMP112 makes a conversion
are shown in Table 7. For compatibility, the first byte
and then powers down and waits for the appropriate
corresponds to the Configuration Register in the
delay set by CR1 and CR0. Table 8 shows the
TMP75 and TMP275. All registers are updated byte
settings for CR1 and CR0.
by byte.
Table 8. Conversion Rate Settings
Table 7. Configuration and Power-Up/Reset
CR1
CR0
CONVERSION RATE
Formats
0
0
0.25Hz
BYTE
D7
D6
D5
D4
D3
D2
D1
D0
0
1
1Hz
OS
R1
R0
F1
F0
POL
TM
SD
1
0
4Hz (default)
1
0
1
1
0
0
0
0
0
1
1
8Hz
CR1
CR0
AL
EM
0
0
0
0
2
After a power-up or general-call reset, the TMP112
1
0
1
0
0
0
0
0
immediately
starts
a
conversion,
as
shown
in
Figure 12. The first result is available after 26ms
(typical).
The
active
quiescent
current
during
The Extended mode bit configures the device for
conversion is 40
µA (typical at +27°C). The quiescent
Normal mode operation (EM = 0) or Extended mode
current during delay is 2.2
µA (typical at +27°C).
operation
(EM
=
1).
In
Normal
mode,
the
Temperature
Register
and
high-
and
low-limit
registers use a 12-bit data format. Normal mode is
used to make the TMP112 compatible with the
TMP75.
Extended mode (EM = 1) allows measurement of
temperatures
above
+128°C
by
configuring
the
Temperature
Register,
and
high-
and
low-limit
registers, for 13-bit data format.
(1) Delay is set by CR1 and CR0.
Figure 12. Conversion Start
The AL bit is a read-only function. Reading the AL bit
provides information about the comparator mode
status. The state of the POL bit inverts the polarity of
data returned from the AL bit. For POL = 0, the AL bit
reads as '1' until the temperature equals or exceeds
The Shutdown mode bit saves maximum power by
THIGH for the programmed number of consecutive
shutting down all device circuitry other than the serial
faults, causing the AL bit to read as '0'. The AL bit
interface, reducing current consumption to typically
continues to read as '0' until the temperature falls
less than 0.5
µA. Shutdown mode is enabled when
below
TLOW
for
the
programmed
number
of
the SD bit = '1'; the device shuts down when current
consecutive faults, when it again reads as '1'. The
conversion is completed. When SD = '0', the device
status of the TM bit does not affect the status of the
maintains a continuous conversion state.
AL bit.
The Thermostat mode bit indicates to the device
whether to operate in Comparator mode (TM = 0) or
Interrupt mode (TM = 1). For more information on
Comparator and Interrupt modes, see the High- and
Low-Limit Registers section.
Copyright © 2009, Texas Instruments Incorporated
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