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TMP431 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza TMP431
Descripción Electrónicos  짹1째C Temperature Sensor with Series-R, 管-Factor, and Automatic Beta Compensation
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TMP431 Datasheet(HTML) 9 Page - Texas Instruments

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TMP431
TMP432
www.ti.com
SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013
APPLICATION INFORMATION
controlling the emitter current provided acceptable
The TMP431 (two-channel) and TMP432 (three-
temperature measurement results. At 90nm process
channel)
are
digital
temperature
sensors
that
geometry and below, however, the beta factor
combine
a
local
die
temperature
measurement
continues to decrease and the premise that it is
channel
and
a
remote
junction
temperature
independent
of
collector
current
becomes
less
measurement
channel
in
a
single
VSSOP-8
certain.
(TMP431) or VSSOP-10 (TMP432) package. They
are Two-Wire- and SMBus interface-compatible and
To manage this increasing temperature measurement
are specified over a temperature range of –40°C to
error, the TMP431/32 control the collector current
+125°C. The TMP431/32 contain multiple registers
instead of the emitter current. The TMP431/32
for holding configuration information, temperature
automatically detect and choose the correct range
measurement
results,
temperature
comparator
depending
on
the
beta
factor
of
the
external
maximum/minimum limits, and status information.
transistor. This auto-ranging is performed at the
User-programmed high and low temperature limits
beginning of each temperature conversion in order to
stored in the TMP431/32 can be used to trigger an
correct for any changes in the beta factor as a result
over/under temperature alarm (ALERT) on local and
of temperature variation. The device can operate a
remote temperatures. Additional thermal limits can be
PNP transistor with a beta factor as low as 0.1. See
programmed into the TMP431/32 and used to trigger
the
Beta
Compensation
Configuration
Register
another flag (THERM) that can be used to initiate a
section for further information.
system response to rising temperatures.
SERIES RESISTANCE CANCELLATION
For proper remote temperature sensing operation, the
TMP431
requires
only
a
transistor
connected
Series resistance in an application circuit that typically
between DXP and DXN; the TMP432 requires
results
from
printed
circuit
board
(PCB)
trace
transistors conncected between DXP1 and DXN1,
resistance and remote line length is automatically
and between DXP2 and DXN2.
cancelled by the TMP431/32, preventing what would
otherwise result in a temperature offset. A total of up
The SCL and SDA interface pins require pull-up
to 1k
Ω of series line resistance is cancelled by the
resistors as part of the communication bus, while
TMP431/32 if beta correction is disabled and up to
ALERT and THERM are open-drain outputs that also
300
Ω of series line resistance is cancelled if beta
need pull-up resistors. ALERT and THERM may be
correction is enabled, eliminating the need for
shared with other devices if desired for a wired-OR
additional characterization and temperature offset
implementation.
A
0.1
μF
power-supply
bypass
correction. See the two Remote Temperature Error vs
capacitor is recommended for good local bypassing.
Series
Resistance
typical
characteristic
curves
See Figure 15 for a typical configuration of the
(Figure 7 and Figure 8) for details on the effects of
TMP431; see Figure 16 for a typical configuration of
series resistance on sensed remote temperature
the TMP432.
error.
BETA COMPENSATION
DIFFERENTIAL INPUT CAPACITANCE
Previous generations of remote junction temperature
The
TMP431/32
can
tolerate
differential
input
sensors were operated by controlling the emitter
capacitance of up to 2200pF with minimal change in
current
of
the
sensing
transistor.
However,
temperature error. The effect of capacitance on
examination of the physics of a transistor shows that
sensed remote temperature error is illustrated in
VBE is actually a function of the collector current. If
Figure 9 and Figure 10, Remote Temperature Error
beta is independent of the collector current, then VBE
vs Differential Capacitance. See the Filtering section
may be calculated from the emitter current. In earlier
for suggested component values where filtering
generations
of
processors
that
contained
PNP
unwanted coupled signals is needed.
transistors connected to these temperature sensors,
Copyright © 2009–2013, Texas Instruments Incorporated
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