Analog Devices TMP05 6 Datasheet

±0.5°C Accurate PWM
Temperature Sensor in 5-Lead SC-70

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 (T while the low period (T 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 recom­mended 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.
) of the PWM remains static over all temperatures,
H
) varies. The B Grade version offers a
L
TMP05/TMP06

FUNCTIONAL BLOCK DIAGRAM

V
DD
5
TMP05/TMP06
TEMPERATURE
CONV/IN
2
SENSOR
REFERENCE
CLK AND
TIMING
GENERATION
Σ-
CORE
4
GND
Figure 1.
The TMP05/TMP06 have three modes of operation: continu­ously 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 continu­ously 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.
AVERAGING
BLOCK /
COUNTER
OUTPUT
CONTROL
1
3
OUT
FUNC
03340-0-001
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
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www.analog.com
TMP05/TMP06
TABLE OF CONTENTS
Specifications..................................................................................... 3
Operating Modes........................................................................ 13
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
REVISION HISTORY
8/04—Revision 0: Initial Version
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
Rev. 0 | Page 2 of 28
TMP05/TMP06

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 = T
3.0 V to 5.5 V, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Nominal Conversion Rate (One Shot Mode) See Table 7
Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) ±2 °C TA = 0°C to 70°C, VDD = 3.0 V − 3.6 V ±3 °C TA = –40°C to +70°C, VDD = 3.0 V − 3.6 V ±4 °C TA = –40°C to +125°C, VDD = 3.0 V − 3.6 V ±5
1
°C TA = –40°C to +150°C, VDD = 3.0 V − 3.6 V Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C, VDD = 4.5 V − 5.5 V Temperature Resolution 0.025 °C/5 µs Step size for every 5 µs on T TH Pulse Width 40 ms TA = 25°C, nominal conversion rate TL Pulse Width 76 ms TA = 25°C, nominal conversion rate
Quarter Period Conversion Rate
See Table 7
(All Operating Modes) Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) 1.5 °C TA = –40°C to +150°C Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on T TH Pulse Width 10 ms TA = 25°C, QP conversion rate TL Pulse Width 19 ms TA = 25°C, QP conversion rate
Double High/Quarter Low Conversion Rate
See Table 7
(All Operating Modes) Accuracy @ VDD = 3.3 V (3.0 V − 3.6 V) 1.5 °C TA = –40°C to +150°C Accuracy @ VDD = 5 V (4.5 V − 5.5 V) 1.5 °C TA = 0°C to 125°C Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on T TH Pulse Width 80 ms TA = 25°C, DH/QL conversion rate TL Pulse Width 19 ms TA = 25°C, DH/QL conversion rate
Long Term Drift 0.081 °C
Drift over 10 years, if part is operated at 55°C
SUPPLIES
Supply Voltage 3 5.5 V Supply Current
Normal Mode2 @ 3.3 V 370 550 µA Nominal conversion rate Normal Mode2 @ 5.0 V 425 650 µA Nominal conversion rate Quiescent2 @ 3.3 V 3 6 µA Device not converting, output is high Quiescent2 @ 5.0 V 5.5 10 µA Device not converting, output is high One Shot Mode @ 1 SPS 30.9 µA
Average current @ V conversion rate @ 25°C
37.38 µA
Average current @ V conversion rate @ 25°C
Power Dissipation 803.33 µW
= 3.3 V, continuously converting at
V
DD
nominal conversion rates @ 25°C
1 SPS 101.9 µW
Average power dissipated for V one shot mode @ 25°C
186.9 µW
Average power dissipated for V one shot mode @ 25°C
to T
MIN
= 3.3 V, nominal
DD
= 5.0 V, nominal
DD
L
L
L
MAX
, VDD =
= 3.3 V,
DD
= 5.0 V,
DD
Rev. 0 | Page 3 of 28
TMP05/TMP06
Parameter Min Typ Max Unit Test Conditions/Comments
TMP05 OUTPUT (PUSH-PULL)
Output High Voltage, V Output Low Voltage, V Output High Current, I Pin Capacitance 10 pF Rise Time,5 t Fall Time,5 t
LH
HL
RON Resistance (Low Output) 55 Supply and temperature dependent
TMP06 OUTPUT (OPEN DRAIN)3
Output Low Voltage, V Output Low Voltage, V Pin Capacitance 10 pF High Output Leakage Current, I Device Turn-On Time 20 ms Fall Time,6 t
HL
RON Resistance (Low Output) 55 Supply and temperature dependent
DIGITAL INPUTS3
Input Current ±1 µA VIN = 0 V to V Input Low Voltage, V Input High Voltage, V Pin Capacitance 3 10 pF
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.
3
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.
6
Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
OL
OUT
3
OH
4
V
− 0.3 V IOH = 800 µA
DD
0.4 V IOL = 800 µA 2 mA Typ VOH = 3.17 V with VDD = 3.3 V
50 ns 50 ns
OL
OL
OH
0.4 V IOL = 1.6 mA
1.2 V IOL = 5.0 mA
0.1 5 µA PWM
= 5.5 V
OUT
30 ns
DD
IL
IH
0.3 × V
0.7 × VDD V
V
DD
Rev. 0 | Page 4 of 28
TMP05/TMP06

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 = T
3.0 V to 5.5 V, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Nominal Conversion Rate (One Shot Mode) See Table 7
Accuracy1 @ VDD = 3.3 V (3.0 V – 3.6 V) ±0.5 ±1 °C TA = 25°C to 70°C, VDD = 3.0 V − 3.6 V
±1.25 °C TA = 0°C to 70°C, VDD = 3.0 V − 3.6 V ±1.5 °C TA = –40°C to +70°C, VDD = 3.0 V − 3.6 V ±2 °C TA = –40°C to +100°C, VDD = 3.0 V − 3.6 V ±2.5 °C TA = –40°C to +125°C, VDD = 3.0 V − 3.6 V ±3
2
°C TA = –40°C to +150°C, VDD = 3.0 V − 3.6 V Accuracy @ VDD = 5.0 V (4.5 V – 5.5 V) 1.5 °C TA = 0°C to 125°C, VDD = 4.5 V − 5.5 V Temperature Resolution 0.025 °C/5 µs Step size for every 5 µs on T TH Pulse Width 40 ms TA = 25°C, nominal conversion rate TL Pulse Width 76 ms TA = 25°C, nominal conversion rate
Quarter Period Conversion Rate
See Table 7
(All Operating Modes) Accuracy @ VDD = 3.3 V (3.0 V – 3.6 V) ±1.5 °C TA = –40°C to +150°C Accuracy @ VDD = 5.0 V (4.5 V – 5.5 V) ±1.5 °C TA = 0°C to 125°C Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on T TH Pulse Width 10 ms TA = 25°C, QP conversion rate TL Pulse Width 19 ms TA = 25°C, QP conversion rate
Double High/Quarter Low Conversion Rate
See Table 7
(All Operating Modes) Accuracy @ VDD = 3.3 V (3.0 V – 3.6 V) ±1.5 °C TA = –40°C to +150°C Accuracy @ VDD = 5 V (4.5 V – 5.5 V) ±1.5 °C TA = 0°C to 125°C Temperature Resolution 0.1 °C/5 µs Step size for every 5 µs on T TH Pulse Width 80 ms TA = 25°C, DH/QL conversion rate TL Pulse Width 19 ms TA = 25°C, DH/QL conversion rate
Long Term Drift
0.081 °C
Drift over 10 years, if part is operated at 55°C
SUPPLIES
Supply Voltage 3 5.5 V Supply Current
Normal Mode3 @ 3.3 V 370 550 µA Nominal conversion rate Normal Mode3 @ 5.0 V 425 650 µA Nominal conversion rate Quiescent3 @ 3.3 V 3 6 µA Device not converting, output is high Quiescent3 @ 5.0 V 5.5 10 µA Device not converting, output is high One Shot Mode @ 1 SPS 30.9 µA
Average current @ V conversion rate @ 25°C
37.38 µA
Average current @ V conversion rate @ 25°C
Power Dissipation 803.33 µW
= 3.3 V, continuously converting at
V
DD
nominal conversion rates @ 25°C
1 SPS 101.9 µW
Average power dissipated for V one shot mode @ 25°C
186.9 µW
Average power dissipated for V one shot mode @ 25°C
to T
MIN
= 3.3 V, nominal
DD
= 5.0 V, nominal
DD
MAX
L
L
L
, VDD =
= 3.3 V,
DD
= 5.0 V,
DD
Rev. 0 | Page 5 of 28
TMP05/TMP06
Parameter Min Typ Max Unit Test Conditions/Comments
TMP05 OUTPUT (PUSH-PULL)
Output High Voltage, V Output Low Voltage, V Output High Current, I Pin Capacitance 10 pF Rise Time,6 t Fall Time,6 t
LH
HL
RON Resistance (Low Output) 55 Supply and temperature dependent
TMP06 OUTPUT (OPEN DRAIN)4
Output Low Voltage, V Output Low Voltage, V Pin Capacitance 10 pF High Output Leakage Current, I Device Turn-On Time 20 ms Fall Time,7 t
HL
DIGITAL INPUTS4
Input Current ±1 µA VIN = 0 V to V Input Low Voltage, V Input High Voltage, V Pin Capacitance 3 10 pF
1
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.
4
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.
7
Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
OL
OUT
4
OH
5
VDD − 0.3 V IOH = 800 µA
0.4 V IOL = 800 µA 2 mA Typ VOH = 3.17 V with VDD = 3.3 V
50 ns 50 ns
OL
OL
OH
0.4 V IOL = 1.6 mA
1.2 V IOL = 5.0 mA
0.1 5 µA PWM
OUT
= 5.5 V
30 ns
DD
IL
IH
0.3 × V
0.7 × VDD V
V
DD
Rev. 0 | Page 6 of 28
TMP05/TMP06

TIMING CHARACTERISTICS

TA = T Guaranteed by design and characterization, not production tested.
Ta bl e 3.
Parameter Limit Unit Comments
TH 40 ms typ PWM high time @ 25°C under nominal conversion rate TL 76 ms typ PWM low time @ 25°C under nominal conversion rate
1
t
3
1
t
4
2
t
4
t5 25 µs max Daisy-chain start pulse width
1
Test load circuit is 100 pF to GND.
2
Test load circuit is 100 pF to GND, 10 kΩ to 5.5 V.
MIN
to T
, VDD = 3.0 V to 5.5 V, unless otherwise noted.
MAX
50 ns typ TMP05 output rise time 50 ns typ TMP05 output fall time 30 ns typ TMP06 output fall time
T
T
H
L
t
3
90%10%
t
4
90% 10%
03340-0-002
Figure 2. PWM Output Nominal Timing Diagram (25°C)
START PULSE
t
5
03340-0-003
Figure 3. Daisy- Chain Start Timing
Rev. 0 | Page 7 of 28
TMP05/TMP06

ABSOLUTE MAXIMUM RATINGS

Table 4.
Parameter Rating
VDD to GND –0.3 V to +7 V Digital Input Voltage to GND –0.3 V to VDD + 0.3 V Maximum Output Current (OUT) ±10 mA Operating Temperature Range
1
–40°C to +150°C Storage Temperature Range –65°C to +160°C Maximum Junction Temperature, T
JMAX
150°C 5-Lead SOT-23
Power Dissipation
2
W
= (TJ max – T
MAX
3
)/θ
A
JA
Thermal Impedance4
θJA, Junction-to-Ambient (Still Air) 240°C/W
5-Lead SC-70
Power Dissipation2 W
= (TJ max – T
MAX
3
)/θ
A
JA
Thermal Impedance4
θJA, Junction-to-Ambient 207.5°C/W θJC, Junction-to-Case 172.3°C/W
IR Reflow Soldering
Peak Temperature 220°C (0°C/5°C) Time at Peak Temperature 10 s to 20 s Ramp-Up Rate 2°C/s to 3°C/s Ramp-Down Rate –6°C/s
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
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
3
TA = ambient temperature.
4
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.
4 ).
A
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.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
MAXIMUM POWER DISSIPATION (W)
0.1
0
–40 –20 0 20 40 60 80 100 120 140
SC-70
SOT-23
TEMPERATURE (°C)
Figure 4. Maximum Power Dissipation vs. Temperature
03340-0-004

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.
Rev. 0 | Page 8 of 28
TMP05/TMP06

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 OUT
Digital Output. Pulse-width modulated (PWM) output gives a square wave whose ratio of high to low period is proportional to temperature.
2 CONV/IN
Digital Input. In continuously converting and one shot operating modes, a high, low, or float input determines the temperature measurement rate. In daisy-chain operating mode, this pin is the input pin for the PWM signal from the previous part on the daisy chain.
3 FUNC
Digital Input. A high, low, or float input on this pin gives three different modes of operation. For details, see the
Operating Modes section. 4 GND Analog and Digital Ground. 5 VDD
Positive Supply Voltage, 3.0 V to 5.5 V. Use of a decoupling capacitor of 0.1 µF as close as possible to this pin is
strongly recommended.
1
OUT
CONV/IN
FUNC
TMP05/
TMP06
2
TOP VIEW
(Not to Scale)
3
Figure 5. Pin Configuration
V
5
DD
4
GND
03340-0-005
Rev. 0 | Page 9 of 28
TMP05/TMP06

TYPICAL PERFORMANCE CHARACTERISTICS

10
9
8
7
6
5
4
3
OUTPUT FREQUENCY (Hz)
2
VDD = 3.3V
1
OUT PIN LOADED WITH 10k
0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
03340-0-020
VDD = 3.3V C
LOAD
0
VOLTAGE (V)
1V/DIV
= 100pF
0
TIME (ns)
100ns/DIV
03340-0-023
Figure 6. PWM Output Frequency vs. Temperature
8.37
8.36
8.35
8.34
8.33
8.32
8.31
OUTPUT FREQUENCY (Hz)
OUT PIN LOADED WITH 10k
8.30 AMBIENT TEMPERATURE = 25°C
8.29
3.0 5.45.14.84.54.23.93.63.3 SUPPLY VOLTAGE (V)
Figure 7. PWM Output Frequency vs. Supply Voltage
140
VDD = 3.3V OUT PIN LOADED WITH 10k
120
TL TIME
100
80
60
TIME (ms)
40
T
TIME
H
03340-0-021
VDD = 3.3V C
LOAD
0
VOLTAGE (V)
1V/DIV
VDD = 3.3V R
PULLUP
R
LOAD
C
LOAD
0
VOLTAGE (V)
Figure 9. TMP05 Output Rise Time at 25°C
= 100pF
0
TIME (ns)
Figure 10. TMP05 Output Fall Time at 25°C
= 1k
= 10 k
= 100pF
100ns/DIV
03340-0-024
20
0
–50 –30 –10 10 30 50 70 90 110 130 150
Figure 8. T
TEMPERATURE (°C)
and TL Times vs. Temperature
H
03340-0-022
Rev. 0 | Page 10 of 28
1V/DIV
0
TIME (ns)
Figure 11. TMP06 Output Fall Time at 25°C
100ns/DIV
03340-0-025
TMP05/TMP06
2000
VDD = 3.3V
1800
1600
1400
1200
1000
TIME (ns)
800
600
400
200
0
0 10000900080007000600050004000300020001000
CAPACTIVE LOAD (pF)
RISE TIME
FALL TIME
Figure 12. TMP05 Output Rise and Fall Times vs. Capacitive Load
250
VDD = 3.3V
200
150
I
LOAD
= 5mA
03340-0-026
1.25 VDD = 3.3V CONTINUOUS MODE OPERATION
1.00 NOMINAL CONVERSION RATE
0.75
0.50
0.25
0
–0.25
–0.50
TEMPERATURE ERROR (°C)
–0.75
–1.00
–1.25
–40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 15. Output Accuracy vs. Temperature
350
VDD = 3.3V CONTINUOUS MODE OPERATION
300
NOMINAL CONVERSION RATE NO LOAD ON OUT PIN
250
200
03340-0-029
100
= 1mA
I
= 0.5mA
I
OUTPUT LOW VOLTAGE (mV)
50
0 –50 –25 0 25 50 75 100 125 150
LOAD
LOAD
TEMPERATURE (°C)
Figure 13. TMP06 Output Low Voltage vs. Temperature
35
VDD = 3.3V
30
25
SINK CURRENT (mA)
20
15
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 14. TMP06 Open Drain Sink Current vs. Temperature
03340-0-027
03340-0-028
150
CURRENT (µA)
100
50
0 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 16. Supply Current vs. Temperature
255
AMBIENT TEMPERATURE = 25°C CONTINUOUS MODE OPERATION
250
NOMINAL CONVERSION RATE NO LOAD ON OUT PIN
245
240
235
230
SUPPLY CURRENT (µA)
225
220
215
2.7 5.75.45.14.84.54.23.93.63.33.0 SUPPLY VOLTAGE (V)
Figure 17. Supply Current vs. Supply Voltage
03340-0-030
03340-0-031
Rev. 0 | Page 11 of 28
TMP05/TMP06
3.5
3.0
2.5
2.0
1.5
1.0
TEMPERATURE OFFSET (°C)
0.5
VDD = 5.5V
1.25 VDD = 3.3V
AMBIENT TEMPERATURE = 25°C
1.00
0.75
= 5V
V
DD
0.50
TEMPERATURE ERROR (°C)
0.25
0 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 18. Temperature Offset vs. Power Supply Variation from 3.3 V
140
120
100
80
60
TEMPERATURE (°C)
40
20
0
0 10203040506070
TEMPERATURE OF ENVIRONMENT (30°C) CHANGED HERE
FINAL TEMPERATURE = 120°C
TIME (Seconds)
Figure 19. Response to Thermal Shock
03340-0-032
03340-0-033
0
0 5 10 15 20 25 30
LOAD CURRENT (mA)
Figure 20. TMP05 Temperature Error vs. Load Current
03340-0-034
Rev. 0 | Page 12 of 28
TMP05/TMP06

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 over­sampling 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.
Σ-MODULATOR
VOLTAGE REF
AND VPTAT
CLOCK
GENERATOR
INTEGRATOR
+
-
Figure 21. First-Order Σ-∆ Modulator
1-BIT
DAC
COMPARATOR
+
-
DIGITAL
FILTER
03340-0-006
TMP05/TMP06
OUT
(SINGLE-BIT)
The 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 clock­independent.

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, T
, is const ant, while the low period, TL, varies
H
with measured temperature. The output format for the nominal conversion rate is readily decoded by the user as follows:
Temp e rature (°C) = 421 − (751 × (T
)) (1)
H/TL
T
H
Figure 22. TMP05/TMP06 Output Format
T
L
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
FUNC Pin Operating Mode
Low One shot Floating Continuously converting High Daisy-chain

Continuously Converting Mode

In continuously converting mode, the TMP05/TMP06 continu­ously 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.
03340-0-007
Rev. 0 | Page 13 of 28
TMP05/TMP06

One Shot Mode

In one shot mode, the TMP05/TMP06 output one square wave representing temperature when requested by the microcon­troller. 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).
µ
CONTROLLER PULLS DOWN
OUT LINE HERE
TEMP MEASUREMENT
0
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 V
to GND, and, therefore, protects the TMP05 from
DD
short-circuit damage.
5k
TMP05
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.
T
H
V+
µ
CONTROLLER RELEASES
OUT LINE HERE
T
L
TIMET
OUT
03340-0-016
03340-0-019

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
CONV/IN Pin Conversion Rate TH/TL (25°C)
Low
Quarter period
÷ 4, TL ÷ 4)
(T
H
10/19 (ms)
Floating Nominal 40/76 (ms) High
Double high (T
Quarter low (T
x 2)
H
÷ 4)
L
80/19 (ms)
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
Temp e rature (°C) = 421 − (751 × (T
)) (2)
H/TL
Table 8. Conversion Times Using Equation 2
Temperature (°C) TL (ms) Nominal Cycle Time (ms)
–40 65.2 105 –30 66.6 107 –20 68.1 108 –10 69.7 110 0 71.4 111 10 73.1 113 20 74.9 115 25 75.9 116 30 76.8 117 40 78.8 119 50 81 121 60 83.2 123 70 85.6 126 80 88.1 128 90 90.8 131 100 93.6 134 110 96.6 137 120 99.8 140 130 103.2 143 140 106.9 147 150 110.8 151
Rev. 0 | Page 14 of 28
TMP05/TMP06
The temperature equation for the high state conversion rate is
Temp e rature (°C) = 421 − (93.875 × (T
)) (3)
H/TL
Table 9. Conversion Times Using Equation 3
Temperature (°C) TL (ms) High Cycle Time (ms)
–40 16.3 96.2 –30 16.7 96.6 –20 17 97.03 –10 17.4 97.42 0 17.8 97.84 10 18.3 98.27 20 18.7 98.73 25 19 98.96 30 19.2 99.21 40 19.7 99.71 50 20.2 100.24 60 20.8 100.8 70 21.4 101.4 80 22 102.02 90 22.7 102.69 100 23.4 103.4 110 24.1 104.15 120 25 104.95 130 25.8 105.81 140 26.7 106.73 150 27.7 107.71

Daisy-Chain Mode

Setting the FUNC pin to a high state allows multiple TMP05/ TMP06s to be connected together and, therefore, allows one input line of the microcontroller to be the sole receiver of all temperature measurements. In this mode, the CONV/IN pin operates as the input of the daisy chain, and conversions take place at the nominal conversion rate of T
= 40 ms/ 76 ms
H/TL
at 25°C.
Therefore, the temperature equation for the daisy-chain mode of operation is
Temp e rature (°C) = 421 − (751 × (T
)) (4)
H/TL
OUT
CONV/IN
TMP05/
MICRO
TMP06
#1
IN
OUT
CONV/IN
TMP05/
TMP06
#2
OUT
CONV/IN
TMP05/
TMP06
#3
OUT
CONV/IN
TMP05/
TMP06
#N
OUT
Figure 25. Daisy-Chain Structure
A second microcontroller line is needed to generate the conver­sion start pulse on the CONV/IN pin. The pulse width of the start pulse should be less than 25 µs. The start pulse on the CONV/IN pin lets the first TMP05/TMP06 part know that it should start a conversion and output its own temperature now. Once the part has output its own temperature, it then outputs a start pulse for the next part on the daisy-chain link. The pulse width of the start pulse from each TMP05/TMP06 part is typically 17 µs.
Figure 26 shows the start pulse on the CONV/IN pin of the first device on the daisy chain and Figure 27 shows the PWM output by this first part.
MUST GO HIGH ONLY AFTER START PULSE HAS BEEN OUTPUT BY LAST TMP05/TMP06 ON DAISY CHAIN.
START PULSE
CONVERSION STARTS ON
<25µs
T
0
Figure 26. Start Pulse at CONV/IN Pin of First TMP05/TMP06 Device
on Daisy Chain
THIS EDGE
TIME
03340-0-017
03340-0-009
TIME
START PULSE
17µs
03340-0-010
#1 TEMP MEASUREMENT
T
0
Figure 27. Daisy-Chain Temperature Measurement
and Start Pulse Output from First TMP05/TMP06
Rev. 0 | Page 15 of 28
TMP05/TMP06
#1 TEMP MEASUREMENT #2 TEMP MEASUREMENT #N TEMP MEASUREMENT
T
0
Figure 28. Daisy-Chain Signal at Input to the Microcontroller
TIME
Before the start pulse reaches a TMP05/TMP06 part in the daisy chain, the device acts as a buffer for the previous tempera­ture measurement signals. Each part monitors the PWM signal for the start pulse from the previous part. Once the part detects the start pulse, it initiates a conversion and inserts the result at the end of the daisy-chain PWM signal. It then inserts a start pulse for the next part in the link. The final signal input to the microcontroller should look like Figure 28. The input signal on Pin 2 (IN) of the first daisy-chain device must remain low until the last device has output its start pulse.
If the input on Pin 2 (IN) goes high and remains high, the TMP05/TMP06 part powers down between 0.3 s and 1.2 s later. The part, therefore, requires another start pulse to generate another temperature measurement. Note that, to reduce power dissipation through the part, it is recommended to keep Pin 2 (IN) at a high state when the part is not converting. If the IN pin is at 0 V, then the OUT pin is at 0 V (because it is acting as a buffer when not converting), and drawing current through either the pull-up MOSFET (TMP05) or the pull-up resistor (TMP06).

TMP05 OUTPUT

The TMP05 has a push-pull CMOS output (Figure 29) and provides rail-to-rail output drive for logic interfaces. The rise and fall times of the TMP05 output are closely matched, so that errors caused by capacitive loading are minimized. If load capacitance is large (for example, when driving a long cable), an external buffer might improve accuracy.
START PULSE
03340-0-008
An internal resistor is connected in series with the pull-up MOSFET when the TMP05 is operating in one shot mode.
V+
OUT
TMP05
Figure 29. TMP05 Digital Output Structure
03340-0-011

TMP06 OUTPUT

The TMP06 has an open-drain output. Because the output source current is set by the pull-up resistor, output capacitance should be minimized in TMP06 applications. Otherwise, unequal rise and fall times skew the pulse width and introduce measurement errors.
OUT
TMP06
Figure 30. TMP06 Digital Output Structure
03340-0-012
Rev. 0 | Page 16 of 28
TMP05/TMP06

APPLICATION HINTS

THERMAL RESPONSE TIME

The time required for a temperature sensor to settle to a specified accuracy is a function of the thermal mass of the sensor and the thermal conductivity between the sensor and the object being sensed. Thermal mass is often considered equivalent to capacitance. Thermal conductivity is commonly specified using the symbol Q, and can be thought of as thermal resistance. It is commonly specified in units of degrees per watt of power transferred across the thermal joint. Thus, the time required for the TMP05/TMP06 to settle to the desired accuracy is dependent on the package selected, the thermal contact established in that particular application, and the equivalent power of the heat source. In most applications, the settling time is probably best determined empirically.

SELF-HEATING EFFECTS

The temperature measurement accuracy of the TMP05/TMP06 might be degraded in some applications due to self-heating. Errors introduced are from the quiescent dissipation and power dissipated when converting, that is, during T these temperature errors is dependent on the thermal conduc­tivity of the TMP05/TMP06 package, the mounting technique, and the effects of airflow. Static dissipation in the TMP05/ TMP06 is typically 10 W operating at 3.3 V with no load. In the 5-lead SC-70 package mounted in free air, this accounts for a temperature increase due to self-heating of
ΔT = P
× θJA = 10 µW × 211.4°C/W = 0.0021°C (5)
DISS
In addition, power is dissipated by the digital output, which is capable of sinking 800 µA continuously (TMP05). Under an 800 µA load, the output can dissipate
= (0.4 V)(0.8 mA)((TL)/TH + TL)) (6)
P
DISS
For example, with T
= 80 ms and TH = 40 ms, the power
L
dissipation due to the digital output is approximately 0.21 mW. In a free-standing SC-70 package, this accounts for a tempera­ture increase due to self-heating of
ΔT = P
× θJA = 0.21 mW × 211.4°C/W = 0.044°C (7)
DISS
This temperature increase adds directly to that from the quiescent dissipation and affects the accuracy of the TMP05/ TMP06 relative to the true ambient temperature.
. The magnitude of
L

SUPPLY DECOUPLING

The TMP05/TMP06 should be decoupled with a 0.1 µF ceramic capacitor between V if the TMP05/TMP06 are mounted remotely from the power supply. Precision analog products such as the TMP05/TMP06 require a well-filtered power source. Because the TMP05/ TMP06 operate from a single supply, it might seem convenient to simply tap into the digital logic power supply. Unfortunately, the logic supply is often a switch-mode design, which generates noise in the 20 kHz to 1 MHz range. In addition, fast logic gates can generate glitches hundreds of mV in amplitude due to wiring resistance and inductance.
If possible, the TMP05/TMP06 should be powered directly from the system power supply. This arrangement, shown in Figure 31, isolates the analog section from the logic switching transients. Even if a separate power supply trace is not available, however, generous supply bypassing reduces supply-line­induced errors. Local supply bypassing consisting of a 0.1 µF ceramic capacitor is critical for the temperature accuracy specifications to be achieved. This decoupling capacitor must be placed as close as possible to the TMP05/TMP06’s V A recommended decoupling capacitor is Phicomp’s 100 nF, 50 V X74.
Keep the capacitor package size as small as possible, because ESL (equivalent series inductance) increases with increasing package size. Reducing the capacitive value below 100 nF increases the ESR (equivalent series resistance). Use of a capacitor with an ESL of 1 nH and an ESR of 80 mΩ is recommended.
TTL/CMOS
LOGIC
CIRCUITS
SUPPLY
Figure 31. Use Separate Traces to Reduce Power Supply Noise
and GND. This is particularly important,
DD
0.1µF
POWER
pin.
DD
TMP05/
TMP06
03340-0-013
It is recommended that current dissipated through the device be kept to a minimum, because it has a proportional effect on the temperature error.
Rev. 0 | Page 17 of 28
TMP05/TMP06
T
S
0
0

TEMPERATURE MONITORING

The TMP05/TMP06 are ideal for monitoring the thermal environment within electronic equipment. For example, the surface-mounted package accurately reflects the exact thermal conditions that affect nearby integrated circuits.
The TMP05/TMP06 measure and convert the temperature at the surface of their own semiconductor chip. When the TMP05/ TMP06 are used to measure the temperature of a nearby heat source, the thermal impedance between the heat source and the TMP05/TMP06 must be considered. Often, a thermocouple or other temperature sensor is used to measure the temperature of the source, while the TMP05/TMP06 temperature is monitored by measuring T mined, the temperature of the heat source can be inferred from the TMP05/TMP06 output.
One example of using the TMP05/TMP06’s unique properties is in monitoring a high power dissipation microprocessor. The TMP05/TMP06 part, in a surface-mounted package, is mounted directly beneath the microprocessor’s pin grid array (PGA) package. In a typical application, the TMP05/TMP06’s output is connected to an ASIC, where the pulse width is measured. The TMP05/TMP06 pulse output provides a significant advantage in this application, because it produces a linear temperature output while needing only one I/O pin and without requiring an ADC.
and TL. Once the thermal impedance is deter-
H

DAISY-CHAIN APPLICATION

This section provides an example of how to connect two TMP05s in daisy-chain mode to a standard 8052 microcon­troller core. The ADuC812 is the microcontroller used in the following example and has the 8052 as its core processing engine. Figure 32 shows how to interface to the 8052 core device. TMP05 Program Code Example 1 shows how to communicate from the ADuC812 to the two daisy-chained TMP05s. This code can also be used with the ADuC831 or any microprocessor running on an 8052 core.
Figure 32 is a diagram of the input waveform into the ADuC812 from the TMP05 daisy chain, and it shows how the code’s variables are assigned. It should be referenced when reading TMP05 Program Code Example 1. Application notes are available on the Analog Devices Web site showing the TMP05 working with other types of microcontrollers.
IMER T0
TEMPSEGMENT = 1 TEMPSEGMENT = 2 TEMPSEGMENT = 3
TARTS
TEMP_HIGH0
INTO
TEMP_LOW0 TEMP_LOW1
INTO INTO
Figure 32. Reference Diagram for Software Variables
in TMP05 Program Code Example 1
TEMP_HIGH2TEMP_HIGH1
03340-0-035
.1µF
.1µF
V
DD
V
DD
TMP05 (U1)
V
OUT
DD
CONV/IN
FUNC
GND
TMP05 (U2)
V
OUT
DD
CONV/IN
GND FUNC
Figure 33 shows how the three devices are hardwired together. Figure 34 to Figure 36 are flow charts for this program.
START PULSE
V
DD
V
DD
T
T
H
T
0
T
(U1)
H
T
(U1)
L
0
Figure 33. Typical Daisy-Chain Application Circuit
(U1)
TL (U1)
TIME
T
(U2)
H
TIME
START PULSE
T
(U2)
L
START PULSE
ADuC812
P3.7
P3.2/INTO
03340-0-014
Rev. 0 | Page 18 of 28
TMP05/TMP06
DECLARE VARIABLES
INITIALIZE TIMERS
ENABLE TIMER
INTERRUPTS
SEND START
PULSE
START TIMER 0
SET-UP UART
CONVERT VARIABLES
TO FLOATS
CALCULATE
TEMPERATURE
FROM U1
TEMP U1 =
421 – (751
(TEMP_LOW0 – (TEMP_HIGH1)))
×
(TEMP_HIGH0/
SET-UP EDGE
TRIGGERED
(H-L) INTO
ENABLE INTO
INTERRUPT
ENABLE GLOBAL
INTERRUPTS
CALCULATE
TEMPERATURE
FROM U2
TEMP U2 =
421 – (751
(TEMP_LOW1 – (TEMP_HIGH2)))
×
(TEMP_HIGH1/
SEND TEMPERATURE
RESULTS
OUT OF UART
03340-0-038
Figure 35. ADuC812 Temperature Calculation Routine Flowchart
WAIT FOR
INTERRUPT
PROCESS
INTERRUPTS
WAIT FOR END
OF MEASUREMENT
CALCULATE
TEMPERATURE
AND SEND
FROM UART
03340-0-036
Figure 34. ADuC812 Main Routine Flowchart
Rev. 0 | Page 19 of 28
TMP05/TMP06
START TIMER 1
ENTER INTERRUPT
ROUTINE
NO
CHECK IF TIMER 1
IS RUNNING
COPY TIMER 1 VALUES
INTO A REGISTER
RESET TIMER 1
YES
IS TEMPSEGMENT
= 1
YE S
CALCULATE
TEMP_HIGH0
RESET TIMER 0
TO ZERO
NO
IS TEMPSEGMENT
= 2
YES
CALCULATE TEMP_LOW0
USING TIMER 1
VALUES
CALCULATE TEMP_HIGH1
USING TIMER 0
VALUES
RESET TIMER 0
TO ZERO
NO
IS TEMPSEGMENT
= 3
YE S
CALCULATE TEMP_LOW1
CALCULATE
TEMP_HIGH2
USING TIMER 0
VALUES
NO
INCREMENT
TEMPSEGMENT
EXIT INTERRUPT
ROUTINE
Figure 36. ADuC812 Interrupt Routine Flowchart

TMP05 Program Code Example 1

//============================================================================================= // Description : This program reads the temperature from 2 daisy-chained TMP05 parts.
// // This code runs on any standard 8052 part running at 11.0592MHz. // If an alternative core frequency is used, the only change required is an // adjustment of the baud rate timings. // // P3.2 = Daisy-chain output connected to INT0. // P3.7 = Conversion control. // Timer0 is used in gate mode to measure the high time. // Timer1 is triggered on a high-to-low transition of INT0 and is used to measure // the low time. //=============================================================================================
03340-0-037
Rev. 0 | Page 20 of 28
TMP05/TMP06
#include <stdio.h> #include <ADuC812.h> //ADuC812 SFR definitions void delay(int); sbit Daisy_Start_Pulse = 0xB7; //Daisy_Start_Pulse = P3.7 sbit P3_4 = 0xB4; long temp_high0,temp_low0,temp_high1,temp_low1,temp_high2,th,tl; //Global variables to allow //access during ISR. //See Figure 32. int timer0_count=0,timer1_count=0,tempsegment=0;
void int0 () interrupt 0 //INT0 Interrupt Service Routine { if (TR1 == 1) { th = TH1; tl = TL1; th = TH1; //To avoid misreading timer TL1 = 0; TH1 = 0; } TR1=1; //Start timer1 running, if not running Already
if (tempsegment == 1) { temp_high0 = (TH0*0x100+TL0)+(timer0_count*65536); //Convert to integer TH0=0x00; //Reset count TL0=0x00; timer0_count=0; } if (tempsegment == 2) { temp_low0 = (th*0x100+tl)+(timer1_count*65536); //Convert to integer temp_high1 = (TH0*0x100+TL0)+(timer0_count*65536); //Convert to integer TH0=0x00; //Reset count TL0=0x00; timer0_count=0; timer1_count=0; } if (tempsegment == 3) { temp_low1 = (th*0x100+tl)+(timer1_count*65536); //Convert to integer temp_high2 = (TH0*0x100+TL0)+(timer0_count*65536); TH0=0x00; //Reset count TL0=0x00; timer0_count=0; timer1_count=0; }
tempsegment++; }
void timer0 () interrupt 1 { timer0_count++; //Keep a record of timer0 overflows } void timer1 () interrupt 3 { timer1_count++; //Keep a record of timer1 overflows
Rev. 0 | Page 21 of 28
TMP05/TMP06
} void main(void) { double temp1=0,temp2=0; double T1,T2,T3,T4,T5;
// Initialization TMOD = 0x19; // Timer1 in 16-bit counter mode // Timer0 in 16-bit counter mode // with gate on INT0. Timer0 only counts when INTO pin // is high. ET0 = 1; // Enable timer0 interrupts ET1 = 1; // Enable timer1 interrupts tempsegment = 1; // Initialize segment
Daisy_Start_Pulse = 0; // Pull P3.7 low
// Start Pulse Daisy_Start_Pulse = 1; Daisy_Start_Pulse = 0; //Toggle P3.7 to give start pulse // Set T0 to count the high period TR0 = 1; // Start timer0 running IT0 = 1; // Interrupt0 edge triggered
EX0 = 1; // Enable interrupt EA = 1; // Enable global interrupts for(;;) { if (tempsegment == 4) break; }
//CONFIGURE UART SCON = 0x52 ; // 8-bit, no parity, 1 stop bit TMOD = 0x20 ; // Configure timer1.. TH1 = 0xFD ; // ..for 9600baud.. TR1 = 1; // ..(assuming 11.0592MHz crystal)
//Convert variables to floats for calculation T1= temp_high0; T2= temp_low0; T3= temp_high1; T4= temp_low1; T5= temp_high2;
temp1=421-(751*(T1/(T2-T3))); temp2=421-(751*(T3/(T4-T5))); printf("Temp1 = %f\nTemp2 = %f\n",temp1,temp2); //Sends temperature result out UART
while (1); // END of program
}
// Delay routine void delay(int length) { while (length >=0) length--; }
Rev. 0 | Page 22 of 28
TMP05/TMP06

CONTINUOUSLY CONVERTING APPLICATION

This section provides an example of how to connect one TMP05 in continuously converting mode to a microchip PIC16F876 microcontroller. Figure 37 shows how to interface to the PIC16F876.
FIRST TEMP
MEASUREMENT
SECOND TEMP
MEASUREMENT
TMP05 Program Code Example 2 shows how to communicate
T
0
TIME
from the microchip device to the TMP05. This code can also be used with other PICs by simply changing the include file for the part.
PIC16F876
PA.0
TMP05
OUT
CONV/IN
Figure 37. Typical Daisy-Chain Application Circuit
3.3V
V
DD
0.1µF
GNDFUNC

TMP05 Program Code Example 2

//============================================================================================= // // Description : This program reads the temperature from a TMP05 part set up in continuously
// converting mode. // This code was written for a PIC16F876, but can be easily configured to function with other
// PICs by simply changing the include file for the part. // // Fosc = 4MHz // Compiled under CCS C compiler IDE version 3.4 // PWM output from TMP05 connected to PortA.0 of PIC16F876 // //============================================================================================ #include <16F876.h> // Insert header file for the particular PIC being used #device adc=8 #use delay(clock=4000000) #fuses NOWDT,XT, PUT, NOPROTECT, BROWNOUT, LVP
//_______________________________Wait for high function_____________________________________ void wait_for_high() { while(input(PIN_A0)) ; /* while high, wait for low */ while(!input(PIN_A0)); /* wait for high */ } //______________________________Wait for low function_______________________________________ void wait_for_low() { while(input(PIN_A0)); /* wait for high */ } //_______________________________Main begins here____________________________________________ void main(){ long int high_time,low_time,temp;
setup_adc_ports(NO_ANALOGS); setup_adc(ADC_OFF); setup_spi(FALSE);
setup_timer_1 ( T1_INTERNAL | T1_DIV_BY_2); //Sets up timer to overflow after 131.07ms
03340-0-039
Rev. 0 | Page 23 of 28
TMP05/TMP06
do{ wait_for_high(); set_timer1(0); //Reset timer wait_for_low(); high_time = get_timer1(); set_timer1(0); //Reset timer wait_for_high(); low_time = get_timer1();
temp = 421 – ((751 * high_time)/low_time)); //Temperature equation for the high state
//Temperature value stored in temp as a long int }while (TRUE); }
//conversion rate.
Rev. 0 | Page 24 of 28
TMP05/TMP06
Y

OUTLINE DIMENSIONS

2.90 BSC
2.00 BSC
1.25 BSC
0
.
1
0
1.00
0.90
0.70
M
54
12
PIN 1
A
X
0.30
0.15
0.10 COPLANARIT COMPLIANT TO JEDEC STANDARDS MO-203AA
3
0.65 BSC
2.10 BSC
1.10 MAX
SEATING PLANE
0.22
0.08 8°
4° 0°
0.46
0.36
0.26
Figure 38. 5-Lead Thin Shrink Small Outline Transistor Package [SC-70]
(KS-5)
Dimensions shown in millimeters
1.60 BSC
1
PIN 1
1.30
1.15
0.90
0.15MAX
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 39. 5-Lead Small Outline Transistor Package [SOT-23]
4 5
2.80 BSC
3
2
0.95 BSC
1.90 BSC
0.50
0.30
1.45 MAX
SEATING PLANE
0.22
0.08
(RJ-5)
Dimensions shown in millimeters
10°
5° 0°
0.60
0.45
0.30

ORDERING GUIDE

Package Option
Branding
Model
Minimum Quantities/Reel
Temperature
1
Range
Temperature Accuracy
2
Package Description
TMP05AKS-500RL7 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A TMP05AKS-REEL 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A TMP05AKS-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8A TMP05ART-500RL7 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A TMP05ART-REEL 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A TMP05ART-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8A TMP05BKS-500RL7 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B TMP05BKS-REEL 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B TMP05BKS-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8B TMP05BRT-500RL7 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B TMP05BRT-REEL 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B TMP05BRT-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8B TMP05AKSZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C TMP05AKSZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C TMP05AKSZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T8C TMP05ARTZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C TMP05ARTZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C TMP05ARTZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T8C TMP05BKSZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D TMP05BKSZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D TMP05BKSZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T8D TMP05BRTZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D TMP05BRTZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D TMP05BRTZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T8D
Rev. 0 | Page 25 of 28
TMP05/TMP06
Package Option
Branding
Model
Minimum Quantities/Reel
Temperature
1
Range
Temperature Accuracy
2
Package Description
TMP06AKS-500RL7 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A TMP06AKS-REEL 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A TMP06AKS-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9A TMP06ART-500RL7 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A TMP06ART-REEL 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A TMP06ART-REEL7 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9A TMP06BKS-500RL7 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B TMP06BKS-REEL 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B TMP06BKS-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9B TMP06BRT-500RL7 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B TMP06BRT-REEL 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B TMP06BRT-REEL7 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9B TMP06AKSZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C TMP06AKSZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C TMP06AKSZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SC-70 KS-5 T9C TMP06ARTZ-500RL74 500 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C TMP06ARTZ-REEL4 10000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C TMP06ARTZ-REEL74 3000 –40°C to +150°C ±2°C 5-Lead SOT-233 RJ-5 T9C TMP06BKSZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D TMP06BKSZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D TMP06BKSZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SC-70 KS-5 T9D TMP06BRTZ-500RL74 500 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D TMP06BRTZ-REEL4 10000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D TMP06BRTZ-REEL74 3000 –40°C to +150°C ±1°C 5-Lead SOT-233 RJ-5 T9D
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
A-Grade temperature accuracy is over the 0°C to 70°C temperature range and B-Grade temperature accuracy is over the +25°C to 70°C temperature range.
3
Consult sales for availability.
4
Z = Pb-free part.
Rev. 0 | Page 26 of 28
TMP05/TMP06
NOTES
Rev. 0 | Page 27 of 28
TMP05/TMP06
NOTES
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
D03340–0–8/04(0)
Rev. 0 | Page 28 of 28
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