TCN75A
2-Wire Serial Temperature Sensor
Features:
• Temperature-to-Digital Converter
• Accuracy:
- ±1 (typical) from -40°C to +125°C
- ±2°C (maximum) from -40°C to +125°C
• User-selectable Resolution: 0.5°C to 0.0625°C
• Operating Voltage Range: 2.7V to 5.5V
• 2-wire Interface: I
2
C™ Compatible
• Operating Current: 200 µA (typical)
• Shutdown Current: 2 µA (maximum)
• Power-saving One-shot Temperature
Measurement
• Available Packages: MSOP-8, SOIC-8
Description:
Microchip Technology Inc.’s TCN75A digital tempera-
ture sensor converts temperatures between -40°C and
+125°C to a digital word, with ±1°C (typical) accuracy.
The TCN75A product comes with user-programmable
registers that provide flexibility for temperature-sensing
applications.
The
register
settings
allow
user-selectable, 0.5°C to 0.0625°C temperature
measurement resolution, configuration of the
power-saving Shutdown and One-shot (single
conversion on command while in Shutdown) modes
and the specification of both temperature alert output
and hysteresis limits. When the temperature changes
beyond the specified limits, the TCN75A outputs an
alert signal. The user has the option of setting the alert
output signal polarity as an active-low or active-high
comparator output for thermostat operation, or as
temperature
event
interrupt
output
for
microprocessor-based systems.
This sensor has an industry standard 2-wire, I
2
C™
compatible serial interface, allowing up to eight devices
to be controlled in a single serial bus. These features
make the TCN75A ideal for low-cost, sophisticated
multi-zone temperature-monitoring applications.
Typical Applications:
•
•
•
•
•
•
Personal Computers and Servers
Hard Disk Drives and Other PC Peripherals
Entertainment Systems
Office Equipment
Data Communication Equipment
General Purpose Temperature Monitoring
Typical Application
V
DD
PIC
®
Microcontroller
R
SDA
I/O Ports
SCL
ALERT
Package Types
8-Pin SOIC, MSOP
R
PULL-UP
1 SDA
2 SCL
4 GND
V
DD
8
A0 7
A2 5
V
DD
SCL 2
ALERT 3
GND 4
TCN75A
SDA 1
8 V
DD
7 A0
6 A1
5 A2
3 ALERT A1 6
TCN75A
2010 Microchip Technology Inc.
DS21935D-page 1
TCN75A
NOTES:
DS21935D-page 2
2010 Microchip Technology Inc.
TCN75A
1.0
ELECTRICAL
CHARACTERISTICS
†Notice:
Stresses above those listed under “Maximum
ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
Absolute Maximum Ratings †
V
DD
....................................................................... 6.0V
Voltage at all Input/Output pins .....GND – 0.3V to 5.5V
Storage temperature .......................... -65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
Junction Temperature (T
J
) ................................. 150°C
ESD protection on all pins (HBM:MM) .......(4 kV:400V)
Latch-up current at each pin ......................... ±200 mA
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground, and
T
A
= -40°C to +125°C.
Parameters
Power Supply
Operating Voltage Range
Operating Current
Shutdown Current
Power-on Reset (POR) Threshold
Line Regulation
Temperature Sensor Accuracy
T
A
= -40°C to +125°C
Internal
ADC
Conversion Time:
0.5°C Resolution
0.25°C Resolution
0.125°C Resolution
0.0625°C Resolution
Alert Output (Open-drain)
High-level Current
Low-level Voltage
Thermal Response
Response Time
t
RES
—
1.4
—
s
Time to 63% (89°C)
27°C (air) to 125°C (oil
bath)
I
OH
V
OL
—
—
—
—
1
0.4
µA
V
V
OH
= 5V
I
OL
= 3 mA
t
CONV
t
CONV
t
CONV
t
CONV
—
—
—
—
30
60
120
240
—
—
—
—
ms
ms
ms
ms
33 samples/sec (typical)
17 samples/sec (typical)
8 samples/sec (typical)
4 samples/sec (typical)
T
ACY
-2
±1
+2
°C
V
DD
= 3.3V
V
DD
I
DD
I
SHDN
V
POR
°C/V
DD
2.7
—
—
—
—
—
200
0.1
1.7
0.2
5.5
500
2
—
—
V
µA
µA
V
°C/V
Continuous operation
Shutdown mode
V
DD
falling edge
V
DD
= 2.7V to 5.5V
Sym
Min
Typ
Max
Unit
Conditions
2010 Microchip Technology Inc.
DS21935D-page 3
TCN75A
DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground and
T
A
= -40°C to +125°C.
Parameters
Input
High-level Voltage
Low-level Voltage
Input Current
Output (SDA)
Low-level Voltage
High-level Current
Low-level Current
Capacitance
SDA and SCL Inputs
Hysteresis
V
HYST
0.05 V
DD
—
—
V
V
OL
I
OH
I
OL
C
IN
—
—
6
—
—
—
—
10
0.4
1
—
—
V
µA
mA
pF
I
OL
= 3 mA
V
OH
= 5V
V
OL
= 0.6V
V
IH
V
IL
I
IN
0.7 V
DD
—
-1
—
—
—
—
0.3 V
DD
+1
V
V
µA
Sym
Min
Typ
Max
Units
Conditions
Serial Input/Output (SCL, SDA, A0, A1, A2)
Graphical Symbol Description
INPUT
Voltage
V
DD
Voltage
V
DD
V
IH
V
IL
time
Current
Current
I
OL
I
IN
time
I
OH
time
V
OL
time
OUTPUT
TEMPERATURE CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= +2.7V to +5.5V and GND = Ground.
Parameters
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 8L-SOIC
Thermal Resistance, 8L-MSOP
Note 1:
JA
JA
—
—
163
206
—
—
°C/W
°C/W
T
A
T
A
T
A
-40
-40
-65
—
—
—
+125
+125
+150
°C
°C
°C
Note 1
Sym
Min
Typ
Max
Units
Conditions
Operation in this range must not cause T
J
to exceed Maximum Junction Temperature (+150°C).
DS21935D-page 4
2010 Microchip Technology Inc.
TCN75A
SERIAL INTERFACE TIMING SPECIFICATIONS (Note
1)
Electrical Specifications:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground, T
A
= -40°C to +125°C,
C
L
= 80 pF and all limits measured to 50% point.
Parameters
Serial Port Frequency
Clock Period
Low Clock
High Clock
Rise Time
Fall Time
Data Setup Before SCL High
Data Hold After SCL Low
Start Condition Setup Time
Start Condition Hold Time
Stop Condition Setup Time
Bus Idle
Note 1:
Sym
f
SC
t
SC
t
LOW
t
HIGH
t
R
t
F
t
SU-DATA
t
H-DATA
t
SU-START
t
H-START
t
SU-STOP
t
B-FREE
Min
0
2.5
1.3
0.6
20
20
0.1
0
0.6
0.6
0.6
1.3
Typ
—
—
—
—
—
—
—
—
—
—
—
—
Max
400
—
—
—
300
300
—
—
—
—
—
—
Units
kHz
µs
µs
µs
ns
ns
µs
µs
µs
µs
µs
µs
10% to 90% of V
DD
(SCL, SDA)
90% to 10% of V
DD
(SCL, SDA)
Conditions
2-Wire I
2
C™ Compatible Interface
Specification limits are characterized but not product tested.
Timing Diagram
-S
T
t
H AR
T
-S
TA
R
T
P
IG
H
TO
O
U
-S
W
t
S
t
H
SD
A
SC
L
U
-D
AT
A
t
S
Start Condition
t
H
Data Transmission
-D
AT
A
t
R
,t
F
t
L
Stop Condition
2010 Microchip Technology Inc.
t
S
t
B
DS21935D-page 5
-F
R
U
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