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TMP03 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer TMP03
Beschreibung Serial Digital Output Thermometers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
TMP03 Datasheet, Funktion
a
Serial Digital Output Thermometers
TMP03/TMP04*
FEATURES
Low Cost 3-Pin Package
Modulated Serial Digital Output
Proportional to Temperature
±1.5؇C Accuracy (typ) from –25؇C to +100؇C
Specified –40؇C to +100؇C, Operation to 150؇C
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
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 5 mA. 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 4.5 V to 7 V. Operating from +5 V, supply current
(unloaded) is less than 1.3 mA.
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)
FUNCTIONAL BLOCK DIAGRAM
TMP03/04
TEMPERATURE
SENSOR
VPTAT
DIGITAL
MODULATOR
VREF
1
DOUT
2
V+
3
GND
PACKAGE TYPES AVAILABLE
TO-92
TMP03/04
12 3
DOUT
V+
GND
BOTTOM VIEW
(Not to Scale)
SO-8 and RU-8 (TSSOP)
DOUT 1
8 NC
V+ 2 TMP03/04 7 NC
GND 3 TOP VIEW 6 NC
(Not to Scale)
NC 4
5 NC
NC = NO CONNECT
*Patent pending.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703






TMP03 Datasheet, Funktion
TMP03/TMP04–Typical Performance Characteristics
70
60
50
40
30
20
10
0
–75
V+ = +5V
RLOAD = 10k
–25 25 75 125
TEMPERATURE – °C
175
Figure 3. Output Frequency vs. Temperature
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
4.5
TA = +25°C
RLOAD = 10k
5 5.5 6 6.5 7
SUPPLY VOLTAGE – Volts
7.5
Figure 6. Normalized Output Frequency vs. Supply Voltage
45
40
35
30
25
20
15
10
5
0
–75
VS = +5V
RLOAD = 10k
T2
T1
–25 25
75 125
TEMPERATURE – °C
175
Figure 4. T1 and T2 Times vs. Temperature
Running:
50.0MS/s
Sample
(T)
TA = +25°C
VDD = +5V
CLOAD = 100pF
RLOAD = 1k
Ch 1 +Width
s
Wfm does not
cross ref
Ch 1 –Width
s
Wfm does not
cross ref
Ch 1 Rise
500ns
Ch1
Fall
s
No valid
edge
TIME SCALE = 1µs/DIV
Figure 7. TMP03 Output Rise Time at +25°C
Running:
200MS/s ET
Sample
(T)
TA = +25°C
VDD = +5V
Ch 1 +Width
s
Wfm does not
cross ref
CLOAD = 100pF
RLOAD = 1k
Ch 1 –Width
s
Wfm does not
cross ref
Ch1
Rise
s
No valid
edge
Ch 1 Fall
209.6ns
TIME SCALE = 250ns/DIV
Figure 5. TMP03 Output Fall Time at +25°C
Running:
50.0MS/s
Sample
(T)
TA = +125°C
VDD = +5V
CLOAD = 100pF
RLOAD = 1k
Ch 1 +Width
s
Wfm does not
cross ref
Ch 1 –Width
s
Wfm does not
cross ref
Ch 1 Rise
538ns
Ch1
Fall
s
No valid
edge
TIME SCALE – 1µs/DIV
Figure 8. TMP03 Output Rise Time at +125°C
–6– REV. 0

6 Page









TMP03 pdf, datenblatt
TMP03/TMP04
Software for the interface is shown in Listing 1. The program
monitors the TMP04 output, and turns the counters on and off
to measure the duty cycle. The time that the output is high is
measured by Timer 0, and the time that the output is low is
measured by Timer 1. When the routine finishes, the results are
available in Special Function Registers (SFRs) 08AH through
08DH.
Listing 1. An 80C51 Software Routine for the TMP04
;
; Test of a TMP04 interface to the 8051,
; using timer 0 and timer 1 to measure the duty cycle
;
; This program has three steps:
; 1. Clear the timer registers, then wait for a low-to-
; high transition on input P1.0 (which is connected
; to the output of the TMP04).
; 2. When P1.0 goes high, timer 0 starts. The program
; then loops, testing P1.0.
; 3. When P1.0 goes low, timer 0 stops & timer 1 starts. The
; program loops until P1.0 goes low, when timer 1 stops
; and the TMP04’s T1 and T2 values are stored in Special
; Function registers 8AH through 8DH (TL0 through TH1).
;
;
; Primary controls
$MOD51
$TITLE(TMP04 Interface, Using T0 and T1)
$PAGEWIDTH(80)
$DEBUG
$OBJECT
;
; Variable declarations
;
PORT1
DATA
90H
;SFR register for port 1
;TCON
DATA
88H
;timer control
;TMOD
DATA
89H
;timer mode
;TH0
DATA
8CH
;timer 0 hi byte
;TH1
DATA
8DH
;timer 1 hi byte
;TL0
DATA
8AH
;timer 0 lo byte
;TL1
DATA
8BH
;timer 1 low byte
;
;
ORG 100H
;arbitrary start
;
READ_TMP04:
MOV
A,#00
;clear the
MOV TH0,A
; counters
MOV TH1,A
; first
MOV TL0,A
;
MOV TL1,A
;
WAIT_LO:
JB
PORT1.0,WAIT_LO
;wait for TMP04 output to go low
MOV A,#11H
;get ready to start timer0
MOV TMOD,A
WAIT_HI:
JNB
PORT1.0,WAIT_HI
;wait for output to go high
;
;Timer 0 runs while TMP04 output is high
;
SETB
TCON.4
;start timer 0
WAITTIMER0:
JB
PORT1.0,WAITTIMER0
CLR TCON.4
;shut off timer 0
;
;Timer 1 runs while TMP04 output is low
;
SETB
TCON.6
;start timer 1
WAITTIMER1:
JNB
PORT1.0,WAITTIMER1
CLR TCON.6
;stop timer 1
MOV A,#0H
;get ready to disable timers
MOV TMOD,A
RET
END
–12–
REV. 0

12 Page





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