TMP03FRU-TMP03FS-TMP03FT9-TMP04FS Fast Delivery |IC PHOENIX CO.,LIMITED

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TMP03FRU-TMP03FS-TMP03FT9-TMP04FS
Serial Digital Output Thermometers
FUNCTIONAL BLOCK DIAGRAM
DOUTV+GND
REV.0Serial Digital Output Thermometers
FEATURES
Low Cost 3-Pin Package
Modulated Serial Digital Output
Proportional to Temperature
±1.58C Accuracy (typ) from –258C to +1008C
Specified –408C to +1008C, Operation to 1508C
Power Consumption 6.5 mW Max at 5 V
Flexible Open-Collector Output on TMP03
CMOS/TTL Compatible Output on TMP04
Low Voltage Operation (4.5 V to 7 V)
APPLICATIONS
Isolated Sensors
Environmental Control Systems
Computer Thermal Monitoring
Thermal Protection
Industrial Process Control
Power System Monitors
PACKAGE TYPES AVAILABLE
TO-92
DOUTV+GND
BOTTOM VIEW
(Not to Scale)
SO-8 and RU-8 (TSSOP)
NC = NO CONNECT
DOUT
GND
GENERAL DESCRIPTION
The TMP03/TMP04 is a monolithic temperature detector that
generates a modulated serial digital output that varies in direct
proportion to the temperature of the device. An onboard sensor
generates a voltage precisely proportional to absolute temperature
which is compared to an internal voltage reference and 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 is ±1.5°C (typical)
from –25°C to +100°C, with excellent transducer linearity. The
digital output of the TMP04 is CMOS/TTL compatible, and is
easily interfaced to the serial inputs of most popular micro-
processors. The open-collector output of the TMP03 is capable
of sinking 5mA. The TMP03 is best suited for systems requiring
isolated circuits utilizing optocouplers or isolation transformers.
The TMP03 and TMP04 are specified for operation at supply
voltages from 4.5V to 7V. Operating from +5V, supply current
(unloaded) is less than 1.3mA.
The TMP03/TMP04 are rated for operation over the –40°C to
+100°C temperature range in the low cost TO-92, SO-8, and
TSSOP-8 surface mount packages. Operation extends to
+150°C with reduced accuracy.
(continued on page 4)
*Patent pending.
NOTESMaximum deviation from output transfer function over specified temperature range.Guaranteed but not tested.
Specifications subject to change without notice.
Test LoadkΩ to +5 V Supply, 100 pF to Ground
TMP04F
NOTESMaximum deviation from output transfer function over specified temperature range.
TMP03/TMP04–SPECIFICATIONS
TMP03F(V+ = +5 V, –408C ≤ TA ≤ 1008C unless otherwise noted)
(V+ = +5V, –408C ≤ TA ≤ +1008C unless otherwise noted)

TMP03/TMP04
(continued from page 1)
The TMP03/TMP04 is a powerful, complete temperature
measurement system with digital output, on a single chip. The
onboard temperature sensor follows in the footsteps of the
TMP01 low power programmable temperature controller,
offering 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 sigma-delta
modulator, also known as the “charge balance” type analog-to-
digital converter. (See Figure 1.) This type of converter utilizes
time-domain oversampling and a high accuracy comparator to
deliver 12 bits of effective accuracy in an extremely compact
circuit.
INTEGRATOR
COMPARATOR
∑Δ MODULATOR
TMP03/04
OUT
(SINGLE-BIT)
Figure 1.TMP03/TMP04 Block Diagram Showing
First-Order Sigma-Delta Modulator
Basically, the sigma-delta 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, called
oversampling. This spreads the quantization noise over a much
wider band than that of the input signal, improving overall noise
performance and increasing accuracy.
The modulated output of the comparator is encoded using a
circuit technique (patent pending) which results in a serial
digital signal with a mark-space ratio format that is easily
decoded by any microprocessor into either degrees centigrade or
degrees Fahrenheit values, and readily transmitted or modulated
over a single wire. Most importantly, this encoding method
neatly avoids major error sources common to other modulation
techniques, as it is clock-independent.
Output Encoding
Accurate sampling of an analog signal requires precise spacing
of the sampling interval in order to maintain an accurate
representation of the signal in the time domain. This dictates a
master clock between the digitizer and the signal processor. In
the case of compact, cost-effective data acquisition systems, the
addition of a buffered, high speed clock line can represent a
significant burden on the overall system design. Alternatively,
the addition of an onboard clock circuit with the appropriate
accuracy and drift performance to an integrated circuit can add
significant cost. The modulation and encoding techniques
utilized in the TMP03/TMP04 avoid this problem and allow the
overall circuit to fit into a compact, three-pin package. To
achieve this, a simple, compact onboard clock and an
oversampling digitizer that is insensitive to sampling rate
variations are used. Most importantly, the digitized signal is
encoded into a ratiometric format in which the exact frequency
of the TMP03/TMP04’s clock is irrelevant, and the effects of
clock variations are effectively canceled upon decoding by the
digital filter.
The output of the TMP03/TMP04 is a square wave with a
nominal frequency of 35Hz (±20%) at +25°C. The output
format is readily decoded by the user as follows:
Figure 2.TMP03/TMP04 Output Format
Temperature (°C) =
235−400×T12
Temperature (°F) =
455−720×T1
The time periods T1 (high period) and T2 (low period) are
values easily read by a microprocessor timer/counter port, with
the above calculations performed in software. Since both
periods are obtained consecutively, using the same clock,
performing the division indicated in the above formulas results
in a ratiometric value that is independent of the exact frequency
of, or drift in, either the originating clock of the TMP03/TMP04 or
the user’s counting clock.
Table I. Counter Size and Clock Frequency Effects on Quantization Error
Optimizing Counter Characteristics
Counter resolution, clock rate, and the resultant temperature
decode error that occurs using a counter scheme may be
determined from the following calculations:T1 is nominally 10 ms, and compared to T2 is relatively
insensitive to temperature changes. A useful worst-case
assumption is that T1 will never exceed 12 ms over the
specified temperature range.
T1 max = 12 ms
Substituting this value for T1 in the formula, temperature
(°C) = 235 – ([T1/T2] × 400), yields a maximum value of
T2 of 44 ms at 125°C. Rearranging the formula allows the
maximum value of T2 to be calculated at any maximum
operating temperature:
T2 (Temp) = (T1max × 400)/(235 – Temp) in secondsWe now need to calculate the maximum clock frequency we
can apply to the gated counter so it will not overflow during
T2 time measurement. The maximum frequency is calculated
using:
Frequency (max) = Counter Size/ (T2 at maximum
temperature)
Substituting in the equation using a 12-bit counter gives,
Fmax = 4096/44 ms . 94 kHz.Now we can calculate the temperature resolution, or
quantization error, provided by the counter at the chosen
clock frequency and temperature of interest. Again, using a
12-bit counter being clocked at 90 kHz (to allow for ~5%
temperature over-range), the temperature resolution at
+25°C is calculated from:
Quantization Error (°C) = 400 × ([Count1/Count2] –
[Count1 – 1]/[Count2 + 1])
Quantization Error (°F) = 720 × ([Count1/Count2] –
[Count1 – 1]/[Count2 + 1])
where, Count1 = T1max × Frequency, and Count2 =
T2 (Temp) × Frequency. At +25°C this gives a resolution of
better than 0.3°C. Note that the temperature resolution
calculated from these equations improves as temperature
increases. Higher temperature resolution will be obtained by
employing larger counters as shown in Table I. The internal
quantization error of the TMP03/TMP04 sets a theoretical
minimum resolution of approximately 0.1°C at +25°C.
Self-Heating Effects
The temperature measurement accuracy of the TMP03/TMP04
may be degraded in some applications due to self-heating.
Errors introduced are from the quiescent dissipation, and power
typically 4.5mW operating at 5V with no load. In the TO-92
package mounted in free air, this accounts for a temperature
increase due to self-heating of
ΔT = PDISS × ΘJA = 4.5mW × 162°C/W = 0.73°C (1.3°F)
For a free-standing surface-mount TSSOP package, the
temperature increase due to self-heating would be
ΔT = PDISS × ΘJA = 4.5mW × 240°C/W = 1.08°C (1.9°F)
In addition, power is dissipated by the digital output which is
capable of sinking 800μA continuous (TMP04). Under full
load, the output may dissipate DISS=0.6V()0.8mA()T2
T1+T2
For example with T2 = 20ms and T1 = 10ms, the power
dissipation due to the digital output is approximately 0.32mW
with a 0.8mA load. In a free-standing TSSOP package this
accounts for a temperature increase due to output self-heating
ΔT = PDISS × ΘJA = 0.32mW × 240°C/W = 0.08°C (0.14°F)
This temperature increase adds directly to that from the
quiescent dissipation and affects the accuracy of the TMP03/
TMP04 relative to the true ambient temperature. Alternatively,
when the same package has been bonded to a large plate or
other thermal mass (effectively a large heatsink) to measure its
temperature, the total self-heating error would be reduced to
approximately
ΔT = PDISS × ΘJC = (4.5 mW + 0.32mW) × 43°C/W = 0.21°C (0.37°F)
Calibration
The TMP03 and TMP04 are laser-trimmed for accuracy and
linearity during manufacture and, in most cases, no further
adjustments are required. However, some improvement in
performance can be gained by additional system calibration. To
perform a single-point calibration at room temperature, measure
the TMP03/TMP04 output, record the actual measurement
temperature, and modify the offset constant (normally 235; see
the Output Encoding section) as follows:
Offset Constant = 235 + (TOBSERVED – TTMP03OUTPUT)
A more complicated two-point calibration is also possible. This
involves measuring the TMP03/TMP04 output at two temp-
eratures, Temp1 and Temp2, and modifying the slope constant
(normally 400) as follows:
SlopeConstant=Temp2−Temp1
T1@Temp1
T2@Temp1−T1@Temp2
T2@Temp2
TEMPERATURE – °C
OUTPUT FREQUENCY – Hz75125
Figure 3.Output Frequency vs. Temperature
TEMPERATURE – °C
TIME – ms75125
Figure 4.T1 and T2 Times vs. Temperature
TIME SCALE = 250ns/DIV
VOLTAGE SCALE = 2
V/DIV
Figure 5.TMP03 Output Fall Time at +25°C
Figure 6.Normalized Output Frequency vs. Supply Voltage
Figure 7.TMP03 Output Rise Time at +25°C
TIME SCALE – 1µs/DIV
VOLTAGE SCALE – 2
V/DIV
Figure 8.TMP03 Output Rise Time at +125°C
TMP03/TMP04–Typical Performance Characteristics
TIME SCALE = 250ns/DIV
VOLTAGE SCALE = 2
V/DIV
Figure 9.TMP03 Output Fall Time at +125°C
TIME SCALE = 250ns/DIV
VOLTAGE SCALE = 2
V/DIV
Figure 10.TMP04 Output Fall Time at +25°C
TIME SCALE = 250ns/DIV
VOLTAGE SCALE = 2
V/DIV
Figure 11.TMP04 Output Fall Time at +125°C
Figure 12.TMP04 Output Rise Time at +25°C
Figure 13.TMP04 Output Rise Time at +125°C
LOAD CAPACITANCE – pF
TIME – ns
2000
Figure 14.TMP04 Output Rise & Fall Times
vs. Capacitive Load
TMP03/TMP04
TEMPERATURE – °C–50125–25
OUTPUT ACCURACY – 255075100
Figure 15.Output Accuracy vs. Temperature
TIME – ms100102030405060708090
OUTPUT
STARTS
LOW
OUTPUT
STARTS
HIGH
Figure 16.Start-Up Response
TEMPERATURE – °C
SUPPLY CURRENT – µA
800
Figure 17.Supply Current vs. Temperature
Figure 18.Start-Up Voltage vs. Temperature
SUPPLY VOLTAGE – Volts
SUPPLY CURRENT – µA4567
1000
Figure 19.Supply Current vs. Supply Voltage
TEMPERATURE – °C
POWER SUPPLY REJECTION –
°C/V
1.5
Figure 20.Power Supply Rejection vs. Temperature

Partno	Mfg	Dc	Qty	Available	Descript
TMP03FT9	AD	N/a	12	avai	Serial Digital Output Thermometers
TMP03FS	AD	N/a	570	avai	Serial Digital Output Thermometers
TMP03FRU		N/a	200	avai	Serial Digital Output Thermometers
TMP04FS	AD	N/a	130	avai	Serial Digital Output Thermometers
TMP04FS	ADI	N/a	204	avai	Serial Digital Output Thermometers