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TMP05BRT-REEL
?.5艭 Accurate PWM Temperature Sensor in 5-Lead SC-70
±0.5°C Accurate PWM
Temperature Sensor in 5-Lead SC-70
Rev. 0
FEATURES
Modulated serial digital output, proportional to
temperature
±0.5°C accuracy at 25°C
±1.0°C accuracy from 25°C to 70°C
Two grades available
Operation from −40°C to +150°C
Operation from 3 V to 5.5 V
Power consumption 70 µW maximum at 3.3 V
CMOS/TTL-compatible output on TMP05
Flexible open-drain output on TMP06
Small, low cost 5-lead SC-70 and SOT-23 packages
APPLICATIONS
Isolated sensors
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power-system monitors
GENERAL DESCRIPTION The TMP05/TMP06 are monolithic temperature sensors that
generate a modulated serial digital output (PWM), which varies
in direct proportion to the temperature of the devices. The high
period (TH) of the PWM remains static over all temperatures,
while the low period (TL) varies. The B Grade version offers a
higher temperature accuracy of ±1°C from 0°C to 70°C with
excellent transducer linearity. The digital output of the TMP05/
TMP06 is CMOS/TTL compatible, and is easily interfaced to
the serial inputs of most popular microprocessors. The flexible
open-drain output of the TMP06 is capable of sinking 5 mA.
The TMP05/TMP06 are specified for operation at supply
voltages from 3 V to 5.5 V. Operating at 3.3 V, the supply current
is typically 370 µA. The TMP05/TMP06 are rated for operation
over the –40°C to +150°C temperature range. It is not recom-
mended to operate these devices at temperatures above 125°C
for more than a total of 5% (5,000 hours) of the lifetime of the
devices. They are packaged in low cost, low area SC-70 and
SOT-23 packages.
FUNCTIONAL BLOCK DIAGRAM
VDD
OUT
CONV/IN
FUNC
GNDFigure 1.
The TMP05/TMP06 have three modes of operation: continu-
ously converting mode, daisy-chain mode, and one shot mode.
A three-state FUNC input determines the mode in which the
TMP05/TMP06 operate.
The CONV/IN input pin is used to determine the rate with
which the TMP05/TMP06 measure temperature in continu-
ously converting mode and one shot mode. In daisy-chain
mode, the CONV/IN pin operates as the input to the daisy
chain.
PRODUCT HIGHLIGHTS 1. The TMP05/TMP06 have an on-chip temperature sensor
that allows an accurate measurement of the ambient
temperature. The measurable temperature range is –40°C
to +150°C.
2. Supply voltage is 3.0 V to 5.5 V.
3. Space-saving 5-lead SOT-23 and SC-70 packages.
4. Temperature accuracy is typically ±0.5°C. The part needs a
decoupling capacitor to achieve this accuracy.
5. 0.025°C temperature resolution.
6. The TMP05/TMP06 feature a one shot mode that reduces
the average power consumption to 102 µW at 1 SPS.
TABLE OF CONTENTS Specifications.....................................................................................3
TMP05A/TMP06A Specifications.............................................3
TMP05B/TMP06B Specifications..............................................5
Timing Characteristics................................................................7
Absolute Maximum Ratings............................................................8
ESD Caution..................................................................................8
Pin Configuration and Function Descriptions.............................9
Typical Performance Characteristics...........................................10
Theory of Operation......................................................................13
Circuit Information....................................................................13
Converter Details........................................................................13
Functional Description..............................................................13
Operating Modes........................................................................13
TMP05 Output...........................................................................16
TMP06 Output...........................................................................16
Application Hints...........................................................................17
Thermal Response Time...........................................................17
Self-Heating Effects....................................................................17
Supply Decoupling.....................................................................17
Temperature Monitoring...........................................................18
Daisy-Chain Application...........................................................18
Continuously Converting Application....................................23
Outline Dimensions.......................................................................25
Ordering Guide..........................................................................25
REVISION HISTORY
8/04—Revision 0: Initial Version SPECIFICATIONS
TMP05A/TMP06A SPECIFICATIONS All A Grade specifications apply for −40°C to +150°C; VDD decoupling capacitor is a 0.1 µF multilayer ceramic; TA = TMIN to TMAX, VDD =
3.0 V to 5.5 V, unless otherwise noted.
Table 1. 1 It is not recommended to operate the device at temperatures above 125°C for more than a total of 5% (5,000 hours) of the lifetime of the device. Any exposure beyond
this limit affects device reliability.
2 Normal mode current relates to current during TL. TMP05/TMP06 are not converting during TH, so quiescent current relates to current during TH. Guaranteed by design and characterization, not production tested.
4 It is advisable to restrict the current being pulled from the TMP05 output, because any excess currents going through the die cause self-heating. As a consequence,
false temperature readings can occur.
5 Test load circuit is 100 pF to GND. Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
TMP05B/TMP06B SPECIFICATIONS All B Grade specifications apply for –40°C to +150°C; VDD decoupling capacitor is a 0.1 µF multilayer ceramic; TA = TMIN to TMAX, VDD =
3.0 V to 5.5 V, unless otherwise noted.
Table 2. The accuracy specifications for 3.0 V to 3.6 V supply range are specified to 3-sigma performance. See . Figure 22
2 It is not recommended to operate the device at temperatures above 125°C for more than a total of 5% (5,000 hours) of the lifetime of the device. Any exposure beyond
this limit affects device reliability.
3 Normal mode current relates to current during TL. TMP05/TMP06 are not converting during TH, so quiescent current relates to current during TH. Guaranteed by design and characterization, not production tested.
5 It is advisable to restrict the current being pulled from the TMP05 output, because any excess currents going through the die cause self-heating. As a consequence,
false temperature readings can occur.
6 Test load circuit is 100 pF to GND. Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
TIMING CHARACTERISTICS TA = TMIN to TMAX, VDD = 3.0 V to 5.5 V, unless otherwise noted.
Guaranteed by design and characterization, not production tested.
Table 3. 1 Test load circuit is 100 pF to GND. Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
90%10%
90%10%
Figure 2. PWM Output Nominal Timing Diagram (25°C)
03340-0-003
Figure 3. Daisy-Chain Start Timing
ABSOLUTE MAXIMUM RATINGS
Table 4. It is not recommended to operate the device at temperatures above 125°C
for more than a total of 5% (5,000 hours) of the lifetime of the device. Any
exposure beyond this limit affects device reliability.
2 SOT-23 values relate to the package being used on a 2-layer PCB and SC-70
values relate to the package being used on a 4-layer PCB. See Figure for a
plot of maximum power dissipation versus ambient temperature (T
A). TA = ambient temperature. Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient resistance is more useful for air-cooled PCB
mounted components.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
0.1–40–20020406080100120140TEMPERATURE (°C)
XIM
POW
ISSIPA
TION
Figure 4. Maximum Power Dissipation vs. Temperature
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUT
CONV/IN
FUNC
VDD
GNDFigure 5. Pin Configuration
Table 5. Pin Function Descriptions TYPICAL PERFORMANCE CHARACTERISTICS –50–30–101030507090110130150TEMPERATURE (°C)
OUTP
UT FRE
NCY
(Hz)
Figure 6. PWM Output Frequency vs. Temperature
8.293.05.45.14.84.54.23.93.63.3SUPPLY VOLTAGE (V)
OUTP
UT FRE
NCY
(Hz)
Figure 7. PWM Output Frequency vs. Supply Voltage
100–50–30–101030507090110130150TEMPERATURE (°C)
TIME (ms)
Figure 8. TH and TL Times vs. Temperature
TIME (ns)
VOLTAGE (V)
Figure 9. TMP05 Output Rise Time at 25°C
TIME (ns)
VOLTAGE (V)
Figure 10. TMP05 Output Fall Time at 25°C
TIME (ns)
VOLTAGE (V)
Figure 11. TMP06 Output Fall Time at 25°C
200010000900080007000600050004000300020001000CAPACTIVE LOAD (pF)
TIME (ns)
Figure 12. TMP05 Output Rise and Fall Times vs. Capacitive Load
100–50–250255075100125150TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (mV)
Figure 13. TMP06 Output Low Voltage vs. Temperature
–50–250255075100125150TEMPERATURE (°C)
INK CURRE
NT (mA)
Figure 14. TMP06 Open Drain Sink Current vs. Temperature
–40–20020406080100120140TEMPERATURE (°C)
RATURE
RROR (
Figure 15. Output Accuracy vs. Temperature
100–50–250255075100125150TEMPERATURE (°C)
CURRE
NT (
Figure 16. Supply Current vs. Temperature
2152.75.75.45.14.84.54.23.93.63.33.0SUPPLY VOLTAGE (V)
CURRE
NT (
Figure 17. Supply Current vs. Supply Voltage
–40–20020406080100120140RATURE
OFFS
TEMPERATURE (°C) Figure 18. Temperature Offset vs. Power Supply Variation from 3.3 V
100010203040506070TIME (Seconds)
RATURE
°C)
Figure 19. Response to Thermal Shock
0.25051015202530LOAD CURRENT (mA)
RATURE
RROR (
Figure 20. TMP05 Temperature Error vs. Load Current
THEORY OF OPERATION
CIRCUIT INFORMATION The TMP05/TMP06 are monolithic temperature sensors that
generate a modulated serial digital output that varies in direct
proportion with the temperature of the device. An on-board
sensor generates a voltage precisely proportional to absolute
temperature, which is compared to an internal voltage reference
and is input to a precision digital modulator. The ratiometric
encoding format of the serial digital output is independent of
the clock drift errors common to most serial modulation
techniques such as voltage-to-frequency converters. Overall
accuracy for the A Grade is ±2°C from 0°C to +70°C, with
excellent transducer linearity. B Grade accuracy is ±1°C from
25°C to 70°C. The digital output of the TMP05 is CMOS/TTL
compatible, and is easily interfaced to the serial inputs of most
popular microprocessors. The open-drain output of the TMP06
is capable of sinking 5 mA.
The on-board temperature sensor has excellent accuracy and
linearity over the entire rated temperature range without
correction or calibration by the user.
The sensor output is digitized by a first-order Σ-∆ modulator,
also known as the charge balance type analog-to-digital
converter. This type of converter utilizes time-domain over-
sampling and a high accuracy comparator to deliver 12 bits of
effective accuracy in an extremely compact circuit.
CONVERTER DETAILS The Σ-∆ modulator consists of an input sampler, a summing
network, an integrator, a comparator, and a 1-bit DAC. Similar
to the voltage-to-frequency converter, this architecture creates,
in effect, a negative feedback loop whose intent is to minimize
the integrator output by changing the duty cycle of the
comparator output in response to input voltage changes. The
comparator samples the output of the integrator at a much
higher rate than the input sampling frequency, which is called
oversampling. Oversampling spreads the quantization noise
over a much wider band than that of the input signal, improving
overall noise performance and increasing accuracy.
OUTThe modulated output of the comparator is encoded using a
circuit technique that results in a serial digital signal with a
mark-space ratio format. This format is easily decoded by any
microprocessor into either °C or °F values, and is readily
transmitted or modulated over a single wire. More importantly,
this encoding method neatly avoids major error sources
common to other modulation techniques, because it is clock-
independent.
FUNCTIONAL DESCRIPTION The output of the TMP05/TMP06 is a square wave with a
typical period of 116 ms at 25°C (CONV/IN pin is left floating).
The high period, TH, is constant, while the low period, TL, varies
with measured temperature. The output format for the nominal
conversion rate is readily decoded by the user as follows:
Temperature (°C) = 421 − (751 × (TH/TL)) (1)
Figure 22. TMP05/TMP06 Output Format
The time periods TH (high period) and TL (low period) are
values easily read by a microprocessor timer/counter port, with
the above calculations performed in software. Because both
periods are obtained consecutively using the same clock,
performing the division indicated in the previous formula
results in a ratiometric value that is independent of the exact
frequency or drift of either the originating clock of the TMP05/
TMP06 or the user’s counting clock.
OPERATING MODES The user can program the TMP05/TMP06 to operate in three
different modes by configuring the FUNC pin on power-up as
either low, floating, or high.
Table 6. Operating Modes
Continuously Converting Mode In continuously converting mode, the TMP05/TMP06 continu-
ously output a square wave representing temperature. The
frequency at which this square wave is output is determined by
the state of the CONV/IN pin on power-up. Any change to the
state of the CONV/IN pin after power-up is not reflected in the
parts until the TMP05/TMP06 are powered down and back up.
One Shot Mode In one shot mode, the TMP05/TMP06 output one square wave
representing temperature when requested by the microcon-
troller. The microcontroller pulls the OUT pin low and then
releases it to indicate to the TMP05/TMP06 that an output is
required. The temperature measurement is output when the
OUT line is released by the microcontroller (see Figure 23).
µCONTROLLER PULLS DOWN
OUT LINE HEREµCONTROLLER RELEASES
OUT LINE HERE
TIMET0 Figure 23. TMP05/TMP06 One Shot OUT Pin Signal
In the TMP05 one shot mode only, an internal resistor is
switched in series with the pull-up MOSFET. The TMP05 OUT
pin has a push-pull output configuration (see Figure 24), and,
therefore, needs a series resistor to limit the current drawn on
this pin when the user pulls it low to start a temperature
conversion. This series resistance prevents any short circuit
from VDD to GND, and, therefore, protects the TMP05 from
short-circuit damage.
TMP05
OUT5kΩ
Figure 24. TMP05 One Shot Mode OUT Pin Configuration
The advantages of the one shot mode include lower average
power consumption, and the microcontroller knows that the
first low-to-high transition occurs after the microcontroller
releases the OUT pin.
Conversion Rate In continuously converting and one shot modes, the state of the
CONV/IN pin on power-up determines the rate at which the
TMP05/TMP06 measure temperature. The available conversion
rates are shown in Table 7.
Table 7. Conversion Rates The TMP05 (push-pull output) advantage when using the high
state conversion rate (double high/quarter low) is lower power
consumption. However, the trade-off is loss of resolution on the
low time. Depending on the state of the CONV/IN pin, two
different temperature equations must be used.
The temperature equation for the low and floating states’
conversion rates is
Temperature (°C) = 421 − (751 × (TH/TL)) (2)
Table 8. Conversion Times Using Equation 2
