2-Wire High-Accuracy Temperature Sensor
2004 Microchip Technology Inc.
DS21909B-page 1
MCP9800/1/2/3
Features
Temperature-to-Digital Converter
Accuracy with 12-bit Resolution:
- 0.5C (typ.) at +25C
- 1C (max.) from -10C to +85C
- 2C (max.) from -10C to +125C
- 3C (max.) from -55C to +125C
User-selectable Resolution: 9 12 bit
Operating Voltage Range: 2.7V to 5.5V
2-wire Interface: I
2
CTM/SMBus Compatible
Operating Current: 200 A (typ.)
Shutdown Current: 1 A (max.)
Power-saving One-shot Temperature
Measurement
Available Packages: SOT-23-5, MSOP-8, SOIC-8
Typical Applications
Personal Computers and Servers
Hard Disk Drives and Other PC Peripherals
Entertainment Systems
Office Equipment
Data Communication Equipment
Mobile Phones
General-purpose Temperature Monitoring
Typical Application
Description
Microchip Technology Inc.'s MCP9800/1/2/3 family of
digital temperature sensors converts temperatures
between -55C and +125C to a digital word. They
provide an accuracy of 1C (max.) from -10C to
+85C.
The MCP9800/1/2/3 family comes with user-program-
mable registers that provide flexibility for temperature
sensing applications. The register settings allow user-
selectable 9-bit to 12-bit temperature measurement
resolution, configuration of the power-saving Shutdown
and One-shot (single conversion on command while in
the Shutdown) modes and the specification of both
temperature alert output and hysteresis limits. When
the temperature changes beyond the specified limits,
the MCP9800/1/2/3 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
CTM/
SMBus compatible serial interface, allowing up to eight
devices to be controlled in a single serial bus. These fea-
tures make the MCP9800/1/2/3 ideal for sophisticated
multi-zone temperature-monitoring applications.
Package Types
PICmicro
V
DD
R
Microcontroller
MCP9800/02
GND
V
DD
ALERT
SDA
SCLK
4
1
2
3
5
I
2
CTM Po
rt
I/O Port
R
PULL-UP
PIC16F737
SDA
GND
ALERT
SCLK
GND
V
DD
ALERT
SDA
SCLK
4
MCP9800
MCP9802
1
2
3
5
SOT-23-5
MCP9801
MCP9803
1
2
3
4
8
7
6
5
SOIC, MSOP
A0
V
DD
A1
A2
MCP9800/02A0: A2, A1, A0 are internally set to (0, 0, 0)
MCP9800/02A5: A2, A1, A0 are internally set to (1, 0, 1)
MCP9802/03: Serial Bus time-out 35 ms (typ.)
2-Wire High-Accuracy Temperature Sensor
MCP9800/1/2/3
DS21909B-page 2
2004 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings
V
DD
....................................................................... 6.0V
Voltage at all Input/Output pins .... GND 0.3V to 5.5V
Storage temperature ..........................-65C to +150C
Ambient temp. with power applied .....-55C to +125C
Junction Temperature (T
J
).................................. 150C
ESD protection on all pins (HBM:MM)....... (4 kV:400V)
Latch-Up Current at each pin ........................ 200 mA
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.
PIN FUNCTION TABLE
NAME
FUNCTION
SDA
Bidirectional Serial Data (open-drain
output)
SCLK
Serial Clock Input
ALERT
Temperature Alert Output (open-drain)
A2
Address Select Pin (bit 2)
A1
Address Select Pin (bit 1)
A0
Address Select Pin (bit 0)
V
DD
Power Supply Input
GND
Ground
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground, and
T
A
= -55C to +125C.
Parameters
Sym
Min
Typ
Max
Unit
Conditions
Power Supply
Operating Voltage Range
V
DD
2.7
--
5.5
V
Operating Current
I
DD
--
200
400
A
Continuous Operation
Shutdown Current
I
SHDN
--
0.1
1
A
Shutdown Mode
Power On Reset Threshold (POR)
V
POR
--
1.7
--
V
V
DD
falling edge
Temperature Sensor Accuracy
Accuracy with 12-bit Resolution:
T
A
= +25C
T
ACY
--
0.5
--
C
V
DD
= 3.3V
-10C < T
A
+85C
T
ACY
-1.0
--
+1.0
C
V
DD
= 3.3V
-10C < T
A
+125C
T
ACY
-2.0
--
+2.0
C
V
DD
= 3.3V
-55C < T
A
+125C
T
ACY
-3.0
--
+3.0
C
V
DD
= 3.3V
Internal
ADC
Conversion Time:
9-bit Resolution
t
CONV
--
30
75
ms
33 samples/sec (typ.)
10-bit Resolution
t
CONV
--
60
150
ms
17 samples/sec (typ.)
11-bit Resolution
t
CONV
--
120
300
ms
8 samples/sec (typ.)
12-bit Resolution
t
CONV
--
240
600
ms
4 samples/sec (typ.)
Alert Output (Open-drain)
High-level Current
I
OH
--
--
1
A
V
OH
= 5V
Low-level Voltage
V
OL
--
--
0.4
V
I
OL
= 3 mA
Thermal Response
Response Time
t
RES
--
1.4
--
s
Time to 63% (88C)
27C (Air) to 125C (oil bath)
2004 Microchip Technology Inc.
DS21909B-page 3
MCP9800/1/2/3
Graphical Symbol Description
DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground and
T
A
= -55C to +125C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Serial Input/Output (SCLK, SDA, A0, A1, A2)
Input
High-level Voltage
V
IH
0.7 V
DD
--
--
V
Low-level Voltage
V
IL
--
--
0.3 V
DD
V
Input Current
I
IN
-1
--
+1
A
Output (SDA)
Low-level Voltage
V
OL
--
--
0.4
V
I
OL
= 3 mA
High-level Current
I
OH
--
--
1
A
V
OH
= 5V
Low-level Current
I
OL
6
--
--
mA
V
OL
= 0.6V
Capacitance
C
IN
--
10
--
pF
SDA and SCLK Inputs
Hysteresis
V
HYST
0.05 V
DD
--
--
V
V
DD
V
IH
V
IL
I
IN
Voltage
Current
time
time
V
DD
I
OH
Voltage
Current
time
time
INPUT
OUTPUT
V
OL
I
OL
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, V
DD
= +2.7V to +5.5V, GND = Ground.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Temperature Ranges
Specified Temperature Range
T
A
-55
--
+125
C
(Note 1)
Operating Temperature Range
T
A
-55
--
+125
C
Storage Temperature Range
T
A
-65
--
+150
C
Thermal Package Resistances
Thermal Resistance, 5L-SOT23
JA
--
256
--
C/W
Thermal Resistance, 8L-SOIC
JA
--
163
--
C/W
Thermal Resistance, 8L-MSOP
JA
--
206
--
C/W
Note 1:
Operation in this range must not cause T
J
to exceed Maximum Junction Temperature (+150C).
MCP9800/1/2/3
DS21909B-page 4
2004 Microchip Technology Inc.
Timing Diagram
SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, V
DD
= 2.7V to 5.5V, GND = Ground, -55C < T
A
< +125C,
C
L
= 80 pF, and all limits measured to 50% point.
Parameters
Sym
Min
Typ
Max
Units
Conditions
2-Wire I
2
C/SMBus Compatible Interface
Serial Port Frequency
f
SC
0
--
400
kHz
I
2
C MCP9800/01
f
SC
10
--
400
kHz
SMBus MCP9802/03
Clock Period
t
SC
2.5
--
--
s
Low Clock
t
LOW
1.3
--
--
s
High Clock
t
HIGH
0.6
--
--
s
Rise Time
t
R
20
--
300
ns
10% to 90% of V
DD
(SCLK, SDA)
Fall Time
t
F
20
--
300
ns
90% to 10% of V
DD
(SCLK, SDA)
Data Setup Before SCLK High
t
SU-DATA
0.1
--
--
s
Data Hold After SCLK Low
t
H-DATA
0
--
0.9
s
Start Condition Setup Time
t
SU-START
0.6
--
--
s
Start Condition Hold Time
t
H-START
0.6
--
--
s
Stop Condition Setup Time
t
SU-STOP
0.6
--
--
s
Bus Idle
t
IDLE
1.3
--
--
s
Time Out
t
OUT
25
35
50
ms
MCP9802/03 only
t
SU-START
t
H-START
t
SU-DATA
t
SU-STOP
t
IDLE
SCLK
SDA
SCLK
SDA
t
H-DATA
t
R
,t
F
t
SC
SCLK
SDA
t
HIGH
t
LOW
START Condition
STOP Condition
Data Transmission
t
OUT
2004 Microchip Technology Inc.
DS21909B-page 5
MCP9800/1/2/3
2.0
TYPICAL PERFORMANCE CURVES
Note: Unless otherwise noted: V
DD
= 2.7V to 5.5V.
FIGURE 2-1:
Average Temperature
Accuracy vs. Ambient Temperature, V
DD
= 3.3V.
FIGURE 2-2:
Average Temperature
Accuracy vs. Ambient Temperature.
FIGURE 2-3:
Average Temperature
Accuracy vs. Ambient Temperature, V
DD
= 3.3V.
FIGURE 2-4:
Temperature Accuracy
Histogram, T
A
= +25C.
FIGURE 2-5:
Supply Current vs. Ambient
Temperature.
FIGURE 2-6:
Shutdown Current vs.
Ambient Temperature.
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-55
-35
-15
5
25
45
65
85
105 125
T
A
(C)
Temp
er
atur
e A
ccu
r
a
cy (C
)
12-Bit Resolution
160 Samples
V
DD
= 3.3V
Spec. Limits
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-55
-35
-15
5
25
45
65
85
105 125
T
A
(C)
Te
m
p
er
at
ur
e A
ccu
r
a
c
y
(
C
)
12-Bit Resolution
160 Samples
V
DD
= 2.7V
V
DD
= 3.3V
V
DD
= 5.5V
V
DD
= 5.0V
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-55
-35
-15
5
25
45
65
85
105 125
T
A
(C)
Te
m
p
er
at
ur
e A
ccu
r
a
c
y
(
C
)
11-Bit
12-Bit
9-Bit
10-Bit
V
DD
= 3.3V
160 Samples
Resolution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
-3
.
0
-2
.
5
-2
.
0
-1
.
5
-1
.
0
-0
.
5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Temperature Accuracy (C)
Occu
r
r
enc
e
s
T
A
= +25C
V
DD
= 3.3V
5 lots
32 Samples/lot
160 Samples
50
100
150
200
250
300
350
400
-55
-35
-15
5
25
45
65
85
105 125
T
A
(C)
I
DD
(
A
)
V
DD
= 2.7V
V
DD
= 3.3V
V
DD
= 5.5V
V
DD
= 5.0V
0
0.2
0.4
0.6
0.8
1
-55
-35
-15
5
25
45
65
85
105 125
T
A
(C )
I
SHDN
(
A
)
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