MCP9844 DATA SHEET (08/07/2014) DOWNLOAD

MCP9844
±1°C Accurate, 1.8V Digital Temperature Sensor
Features:
Description:
2
• 1MHz, 2-Wire I C™ Interface
• User-Selectable Measurement Resolution:
- +0.5°C, +0.25°C, +0.125°C, +0.0625°C
• User-Programmable Temperature Limits:
- Temperature Window Limit
- Critical Temperature Limit
• User-Programmable Temperature Alert Output
• Specified VDD Range: 1.7V to 3.6V
• Operating Current: 100 µA (typical)
• Available Package: 8-Pin TDFN
Microchip Technology Inc.’s MCP9844 digital
temperature sensor converts temperature from -40°C
to +125°C to a digital word. It provides an accuracy of
±0.2°C/±1°C (typical/maximum) from +75°C to +95°C
with an operating voltage of 1.7V to 3.6V.
Temperature Sensor Features:
• Temperature-to-Digital Converter (°C)
• Sensor Accuracy:
- ±0.2°C/±1°C (typ./max.)  +75°C to +95°C
- ±0.5°C/±2°C (typ./max.)  +40°C to +125°C
- ±1°C/±3°C (typ./max.)  -40°C to +125°C
Typical Applications:
•
•
•
•
•
•
•
•
•
•
The MCP9844 digital temperature sensor comes with
user-programmable registers that provide flexibility for
temperature sensing applications. The registers allow
user-selectable settings such as Shutdown or LowPower modes, and the specification of temperature
event boundaries. When the temperature changes
beyond the specified event boundary limits, the
MCP9844 outputs an Alert signal at the Event pin. The
user has the option of setting the temperature event
output signal polarity as either an active-low or activehigh comparator output for the thermostat operation, or
as a temperature event interrupt output for
microprocessor-based systems.
This sensor has an industry standard I2C Fast Mode
Plus compatible 1 MHz serial interface.
Package Types
Temperature Sensing for Solid State Drive (SSD)
General Purpose Temperature Datalog
General Purpose
Industrial Applications
Industrial Freezers and Refrigerators
Food Processing
Personal Computers and Servers
PC Peripherals
Consumer Electronics
Handheld/Portable Devices
8-Pin 2x3 TDFN *
A0 1
A1 2
A2 3
GND 4
8 VDD
EP
9
7 Event
6 SCL
5 SDA
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Temperature Accuracy (°C)
3.0
2.0
Spec. Limits
VDD = 1.7 V to 3.6 V
16 units
1.0
0.0
+Std. Dev.
Average
-Std. Dev.
-1.0
-2.0
-3.0
-40
-20
0
20
40
60
TA (°C)
 2013 Microchip Technology Inc.
80
100
120
DS20005192B-page 1
MCP9844
1.0
†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.
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD.................................................................................. 4.0V
Voltage at all Input/Output pins ............... GND – 0.3V to 4.0V
Pin A0....................................................... GND – 0.3V to 11V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-40°C to +125°C
Junction Temperature (TJ)........................................... +150°C
ESD protection on all pins (HBM:MM) ................. (4 kV:200V)
Latch-Up Current at each pin (25°C)........................ ±200 mA
TEMPERATURE SENSOR DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground,
and TA = -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max.
Unit
TACY
-1.0
±0.2
+1.0
°C
+40°C < TA  +125°C
-2.0
±0.5
+2.0
°C
-40°C < TA  +125°C
-3.0
±1
+3.0
°C
—
30
—
ms
Conditions
Temperature Sensor Accuracy
+75°C < TA  +95°C
VDD = 1.8V
Temperature Conversion Time
0.5°C/bit
tCONV
0.25°C/bit (POR default)
—
65
125
ms
0.125°C/bit
—
130
—
ms
0.0625°C/bit
—
260
—
ms
15 s/sec (typical) (See Section 5.2.4)
Power Supply
Specified Voltage Range
VDD
1.7
—
3.6
V
Operating Current
IDD
—
100
500
µA
Shutdown Current
ISHDN
—
0.2
1
µA
TA = 85°C
Power On Reset (POR)
VPOR
—
1.4
1.6
V
Threshold for falling VDD voltage
Settling time after POR
tPOR
—
—
1
ms
For warm and cold power cycles
Line Regulation
°C
—
0.2
—
°C
VDD = 1.7V to 3.6V
Event Output (Open-Drain output, external pull-up resistor required), see Section 5.2.3
High-level Current (leakage)
IOH
—
—
1
µA
VOH = VDD
Low-level Voltage
VOL
—
—
0.4
V
IOL= 3 mA (Active-Low, Pull-up
Resistor)
—
s
Time to 63% (89°C)
Thermal Response, from +25°C (Air) to +125°C (oil bath)
TDFN-8
DS20005192B-page 2
tRES
—
0.7
 2013 Microchip Technology Inc.
MCP9844
INPUT/OUTPUT PIN DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground and
TA = -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
V
Conditions
Serial Input/Output (SCL, SDA, A0, A1, A2)
Input
High-level Voltage
VIH
0.7VDD
—
—
Low-level Voltage
VIL
—
—
0.3VDD
V
Input Current
IIN
—
—
±5
µA
Input Impedance (A0, A1, A2)
ZIN
—
1
—
M
VIN > VIH
Input Impedance (A0, A1, A2)
ZIN
—
200
—
k
VIN < VIL
Low-level Voltage
VOL
—
—
0.4
V
IOL= 3 mA
High-level Current (leakage)
IOH
—
—
1
µA
VOH = VDD
Low-level Current
IOL
20
—
—
mA
VOL = 0.4V, VDD ≥ 2.2V
6
—
—
mA
VOL = 0.6V
Capacitance
CIN
—
5
—
pF
VHYST
—
0.05VDD
—
V
TSP
—
—
50
ns
SDA and SCL only
Output (SDA only)
SDA and SCL Inputs
Hysteresis
Spike Suppression
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground,
and TA = -40°C to +125°C.
Parameters
Sym.
Min.
Typ.
Max.
Units
Specified Temperature Range
TA
-40
—
+125
°C
Operating Temperature Range
TA
-40
—
+125
°C
Storage Temperature Range
TA
-65
—
+150
°C
JA
—
52.5
—
°C/W
Conditions
Temperature Ranges
Note 1
Thermal Package Resistances
Thermal Resistance, 8L-TDFN
Note 1:
Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C).
 2013 Microchip Technology Inc.
DS20005192B-page 3
MCP9844
SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -40°C to +125°C, and CL = 80 pF
Note 1.
VDD= 1.7V to 3.6V
100 kHz
Parameters
VDD= 2.2V to 3.6V
400 kHz
1000 kHz
Sym.
Min.
Max.
Min.
Max.
Min.
Max.
Units
fSCL
10
100
10
400
10
1000
kHz
Low Clock (Note 2)
tLOW
4700
—
1300
—
500
—
ns
High Clock
tHIGH
4000
—
600
—
260
—
ns
2-Wire
I2
C™ Interface
Serial port frequency (Note 2, 4)
Rise time (Note 5)
tR
—
1000
20
300
—
120
ns
Fall time (Note 5)
tF
20
300
20
300
—
120
ns
Data in Setup time (Note 3)
tSU:DAT
250
—
100
—
50
—
ns
Data in Hold time (Note 6)
tHD:DI
0
—
0
—
0
—
ns
Data out Hold time (Note 4)
tHD:DO
200
900
200
900
0
350
ns
Start Condition Setup time
tSU:STA
4700
—
600
—
260
—
ns
Start Condition Hold time
tHD:STA
4000
—
600
—
260
—
ns
Stop Condition Setup time
tSU:STO
4000
—
600
—
260
—
ns
Bus Idle/Free
tB-FREE
4700
—
1300
—
500
—
ns
tOUT
25
35
25
35
25
35
ms
Cb
—
—
—
400
—
100
pf
Time out
Bus Capacitive load
Note 1:
2:
3:
4:
5:
6:
All values referred to VIL MAX and VIH MIN levels.
If tLOW > tOUT, the temperature sensor I2C interface will time out. A Repeat Start command is required for
communication.
This device can be used in a Standard mode I2C bus system, but the requirement tSU:DAT  250 ns must
be met. This device does not stretch SCL Low period. It outputs the next data bit to the SDA line within tR
2
MAX + tSU:DAT MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard mode I C bus specification)
before the SCL line is released.
As a transmitter, the device provides internal minimum delay time tHD:DAT MIN to bridge the undefined
region (min. 200 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop
conditions.
Characterized but not production tested.
As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD:DI 0 ns after
SCL toggles Low.
RE
E
:F
:S
TO
tB
U
tS
W
O
tH
D:
D
I
tS
/t
U
H
:D
I
D
:D
O
tO
UT
tR
,t
F
SD
A
SC
L
tL
tH
tS
IG
H
U:
ST
tS O
U
:D
I
TIMING DIAGRAM
Start Condition
DS20005192B-page 4
Data Transmission
Stop Condition
 2013 Microchip Technology Inc.
MCP9844
2.0
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note:
Note: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and
TA = -40°C to +125°C.
2.0
150
Spec. Limits
VDD = 1.7 V to 3.6 V
16 units
125
1.0
IDD (µA)
Temperature Accuracy (°C)
3.0
0.0
+Std. Dev.
Average
-Std. Dev.
-1.0
-2.0
75
50
-3.0
-40
-20
0
FIGURE 2-1:
20
40
60
TA (°C)
80
100
120
-40
0
20
25%
Supply Current Vs.
0.50
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0.00
-40
-20
0
20
Temperature Accuracy (°C)
FIGURE 2-2:
Temperature Accuracy
Histogram, TA = + 85 °C.
FIGURE 2-5:
Temperature.
40
60
TA (°C )
80
100 120
Shutdown Current Vs.
1.8
TA = +25 °C
VDD = 1.7 V - 3.6 V
16 units
1.6
VPOR (V)
Occurrences
100 120
0 25
0.25
0%
75%
80
0.75
50%
100%
40
60
TA (°C)
1.00
TA = +85 °C
VDD = 1.7 V - 3.6 V
16 units
ISHDN (µA)
Occurrences
-20
FIGURE 2-4:
Temperature.
Temperature Accuracy.
100%
75%
100
50%
25%
Rising VDD
1.4
1.2
Falling VDD
1
0.8
Temperature Accuracy (°C)
FIGURE 2-3:
Temperature Accuracy
Histogram, TA = + 25 °C.
 2013 Microchip Technology Inc.
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0%
0.6
-40
-20
0
20
40
60
TA (°C)
80
100
120
FIGURE 2-6:
Power-On Reset Threshold
Voltage Vs. Temperature.
DS20005192B-page 5
MCP9844
Note: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and
TA = -40°C to +125°C.
Normallized Temp. Error (°C)
Eve
ent & SDA VOL (V)
0.4
SDA, IOL = 20 mA
VDD = 2.2 V to 3.6 V
0.3
0.2
0.1
01
Event, IOL = 3 mA
0
-40
-20
0
FIGURE 2-7:
Vs. Temperature.
20
40
60
TA (°C)
80
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
100 120
Event Output and SDA VOL
VDD = 1.7 V
VDD = 3.6 V
-40
-20
0
20
40
60
TA (°C)
80
100
120
FIGURE 2-10:
Line Regulation: Change in
Temperature Accuracy Vs. Change in VDD.
200
35
175
tCONV (ms)
I2C Bus tOUT (ms)
0.0625 °C/LSb
150
125
100
75
0.125 °C/LSb
50
0.25 °C/LSb
25
30
0.5 °C/LSb
0
25
-40
-20
0
20
40
60
TA (°C)
80
100 120
FIGURE 2-8:
Temperature Conversion
Rate Vs. Temperature.
-40
-20
FIGURE 2-11:
Temperature.
0
20
40
60
TA (°C)
80
100
120
I2C™ Protocol Time-out Vs.
50
SDA IOL (mA)
VOL = 0.6V
40
30
20
10
-40
-20
0
FIGURE 2-9:
DS20005192B-page 6
20
40
60
TA (°C)
80
100
120
SDA IOL Vs. Temperature.
 2013 Microchip Technology Inc.
MCP9844
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLES
MCP9844
Symbol
Description
TDFN
1
A0
Slave Address
2
A1
Slave Address
3
A2
4
GND
5
SDA
Serial Data Line
6
SCL
Serial Clock Line
7
Event
8
VDD
Power Pin
9
EP
Exposed Thermal Pad (EP); can be connected to GND.
3.1
Slave Address
Ground
Temperature Alert Output
Address Pins (A0, A1, A2)
3.4
These pins are device address input pins.
Serial Clock Line (SCL)
The address pins correspond to the Least Significant
bits (LSb) of the address bits. The Most Significant bits
(MSb) are A6, A5, A4, A3. Refer to Table 3-2.
The SCL is a clock input pin. All communication and
timing is relative to the signal on this pin. The clock is
generated by the host or master controller on the bus.
(See Section 4.0 “Serial Communication”.)
TABLE 3-2:
3.5
Device
Sensor
Note 1:
MCP9844 ADDRESS BYTE
Address Code
Slave
Address
A6
A5
A4
A3
A2
A1
A0
0
0
1
1
X1
X1
X1
User-selectable address is shown by X,
where X is ‘1’ or ‘0’ for VDD and GND,
respectively
The MCP9844 temperature Event output pin is an
open-drain output. The device outputs a signal when
the ambient temperature goes beyond the user
programmed temperature limit. (See Section 5.2.3
“Event Output Configuration”.)
3.6
All address pins have an internal pull-down resistor.
3.2
Ground Pin (GND)
Temperature Alert, Open-Drain
Output (Event)
Power Pin (VDD)
VDD is the power pin. The operating voltage range, as
specified in the DC electrical specification table, is
applied on this pin.
The GND pin is the system ground pin.
3.7
3.3
Serial Data Line (SDA)
The SDA is a bidirectional input/output pin used to
serially transmit data to/from the host controller. This
pin requires a pull-up resistor. (See Section 4.0
“Serial Communication”.)
 2013 Microchip Technology Inc.
Exposed Thermal Pad (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the GND pin; they can
be connected to the same potential on the Printed
Circuit Board (PCB). This provides better thermal
conduction from the PCB to the die.
DS20005192B-page 7
MCP9844
4.0
SERIAL COMMUNICATION
4.1
2-Wire Standard Mode I2C™
Protocol-Compatible Interface
The MCP9844 serial clock input (SCL) and the
bidirectional serial data line (SDA) form a 2-wire
bidirectional Standard mode I2C compatible
communication port (refer to the Input/Output Pin DC
Characteristics table and the Serial Interface Timing
Specifications table).
The following MCP9844 bus protocol is defined in
Table 4-1.
TABLE 4-1:
MCP9844 SERIAL BUS
PROTOCOL DESCRIPTIONS
Term
Description
Master
The device that controls the serial bus,
typically a microcontroller.
Slave
The device addressed by the master,
such as the MCP9844.
Transmitter Device sending data to the bus.
Receiver
Device receiving data from the bus.
START
A unique signal from the master to
initiate serial interface with a slave.
STOP
A unique signal from the master to
terminate serial interface from a slave.
Read/Write A read or write to the MCP9844
registers.
ACK
A receiver Acknowledges (ACK) the
reception of each byte by polling the
bus.
NAK
A receiver Not-Acknowledges (NAK) or
releases the bus to show End-of-Data
(EOD).
Busy
Communication is not possible
because the bus is in use.
Not Busy
The bus is in the Idle state, both SDA
and SCL remain high.
Data Valid
SDA must remain stable before SCL
becomes high in order for a data bit to
be considered valid. During normal
data transfers, SDA only changes state
while SCL is low.
4.1.1
DATA TRANSFER
Data transfers are initiated by a Start condition
(START), followed by a 7-bit device address and a
read/write bit. An Acknowledge (ACK) from the slave
confirms the reception of each byte. Each access must
be terminated by a Stop condition (STOP).
Repeated communication is initiated after tB-FREE.
DS20005192B-page 8
This device does not support sequential register read/
write. Each register needs to be addressed using the
Register Pointer.
This device supports the Receive Protocol. The
register can be specified using the pointer for the initial
read. Each repeated read or receive begins with a Start
condition and address byte. The MCP9844 retains the
previously selected register. Therefore, they output
data from the previously specified register (repeated
pointer specification is not necessary).
4.1.2
MASTER/SLAVE
The bus is controlled by a master device (typically a
microcontroller) that controls the bus access and
generates the Start and Stop conditions. The MCP9844
is a slave device and does not control other devices in
the bus. Both master and slave devices can operate as
either transmitter or receiver. However, the master
device determines which mode is activated.
4.1.3
START/STOP CONDITION
A high-to-low transition of the SDA line (while SCL is
high) is the Start condition. All data transfers must be
preceded by a Start condition from the master. A lowto-high transition of the SDA line (while SCL is high)
signifies a Stop condition.
If a Start or Stop condition is introduced during data
transmission, the MCP9844 releases the bus. All data
transfers are ended by a Stop condition from the
master.
4.1.4
ADDRESS BYTE
Following the Start condition, the host must transmit an
8-bit address byte to the MCP9844. The address for
the
MCP9844
temperature
sensor
is
‘0011,A2,A1,A0’ in binary, where the A2, A1 and A0
bits are set externally by connecting the corresponding
pins to VDD ‘1’ or GND ‘0’. The 7-bit address
transmitted in the serial bit stream must match the
selected address for the MCP9844 to respond with an
ACK. Bit 8 in the address byte is a read/write bit.
Setting this bit to ‘1’ commands a read operation, while
‘0’ commands a write operation (see Figure 4-1).
Address Byte
1
SCL
2
3
4
5
6
7
8
0 0 1 1 A2 A1 A0
SDA
9
A
C
K
Start
Address
Code
Slave
Address R/W
MCP9844 Response
FIGURE 4-1:
Device Addressing.
 2013 Microchip Technology Inc.
MCP9844
4.1.5
DATA VALID
After the Start condition, each bit of data in the
transmission needs to be settled for a time specified by
tSU-DATA before SCL toggles from low-to-high (see
Serial Interface Timing Specifications table).
4.1.6
4.1.7
TIME OUT (TOUT)
If the SCL stays low or high for time specified by tOUT,
the MCP9844 resets the serial interface. This dictates
the minimum clock speed as specified in the
specification.
ACKNOWLEDGE (ACK/NAK)
Each receiving device, when addressed, is obliged to
generate an ACK bit after the reception of each byte.
The master device must generate an extra clock pulse
for ACK to be recognized.
The acknowledging device pulls down the SDA line for
tSU-DATA before the low-to-high transition of SCL from
the master. SDA also needs to remain pulled down for
tH-DATA after a high-to-low transition of SCL.
During read, the master must signal an End-of-Data
(EOD) to the slave by not generating an ACK bit (NAK)
once the last bit has been clocked out of the slave. In
this case, the slave will leave the data line released to
enable the master to generate the Stop condition.
 2013 Microchip Technology Inc.
DS20005192B-page 9
MCP9844
5.0
registers and a 2-wire I2C protocol compatible serial
interface. Figure 5-1 shows a block diagram of the
register structure.
FUNCTIONAL DESCRIPTION
The MCP9844 temperature sensors consist of a band
gap type temperature sensor, a Delta-Sigma Analog-toDigital Converter ( ADC), user-programmable
MCP9844 Temperature Sensor
Hysteresis
Shutdown
Critical Trip Lock
Alarm Win. Lock Bit
Clear Event
Event Status
Output Control
Critical Event only
Band Gap
Temperature
Sensor
Event Polarity
Event Comp./Int.
Configuration
Temperature
 ADC
TUPPER
TLOWER
0.5°C/bit
0.25°C/bit
0.125°C/bit
0.0625°C/bit
TCRIT
Manufacturer ID
Device ID/Rev.
Resolution
Capability
Shutdown Status
I2C™ Bus Time-out
Selected Resolution
Temp. Range
Accuracy
Output Feature
Register
Pointer
Standard I2C
Interface
A0
A1
FIGURE 5-1:
DS20005192B-page 10
A2
Event
SDA
SCL
VDD
GND
Functional Block Diagram.
 2013 Microchip Technology Inc.
MCP9844
5.1
Registers
The MCP9844 device has several registers that are
user accessible. These registers include the Capability
register, Configuration register, Event Temperature
Upper-Boundary and Lower-Boundary Trip registers,
Critical Temperature Trip register, Temperature
register, Manufacturer Identification register and
Device Identification register.
The Temperature register is read-only and is used to
access the ambient temperature data. The data is
loaded in parallel to this register after tCONV. The Event
Temperature Upper-Boundary and Lower-Boundary
Trip registers are read/writes. If the ambient
temperature drifts beyond the user-specified limits, the
MCP9844 device outputs a signal using the Event pin
(refer
to
Section 5.2.3
“Event
Output
Configuration”). In addition, the Critical Temperature
Trip register is used to provide an additional critical
temperature limit.
REGISTER 5-1:
The Capability register is used to provide bits
describing the MCP9844’s capability in measurement
resolution, measurement range and device accuracy.
The device Configuration register provides access to
configure the MCP9844’s various features. These
registers are described in further detail in the following
sections.
The registers are accessed by sending a Register
Pointer to the MCP9844 using the serial interface. This
is an 8-bit write-only pointer. Register 5-1 describes the
pointer or the address of each register. This device will
not acknowledge commands to register pointers other
than those listed in Register 5-1.
REGISTER POINTER (WRITE ONLY)
W-0
W-0
W-0
W-0
—
—
—
—
W-0
W-0
W-0
W-0
Pointer Bits
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
Writable Bits: Write ‘0’
bit 3-0
Pointer Bits:
0000 = Capability register
0001 = Configuration register (CONFIG)
0010 = Event Temperature Upper-Boundary Trip register (TUPPER)
0011 = Event Temperature Lower-Boundary Trip register (TLOWER)
0100 = Critical Temperature Trip register (TCRIT)
0101 = Temperature register (TA)
0110 = Manufacturer ID register
0111 = Device ID/Revision register
1000 = Reserved
1001 = Resolution register
1XXX = Unused (The device will not acknowledge commands to other pointer locations.)
 2013 Microchip Technology Inc.
DS20005192B-page 11
MCP9844
TABLE 5-1:
Register
Pointer
(Hex)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
BIT ASSIGNMENT SUMMARY FOR ALL TEMPERATURE SENSOR REGISTERS
(SEE SECTION 5.3)
Bit Assignment
MSB/
LSB
7
6
5
MSB
LSB
MSB
LSB
0
SHDN Status
0
Crt. Loc.
0
tOUT Range
0
Win. Loc.
0
1
0
Int. Clr.
MSB
LSB
0
23
°C
0
0
2
1
2 °C
2 °C
4
3
2
1
0
0
0
0
0
0
Resolution
Range Accuracy
Event
0
0
Hysteresis
SHDN
Evt. Stat. Evt. Cnt. Evt. Sel. Evt. Pol. Evt. Mod.
SIGN
0
2 °C
27°C
-1
2 °C
7
26°C
25°C
24°C
-2
0
0
6
5
4
2 °C
MSB
0
0
0
SIGN
2 °C
2 °C
2 °C
LSB
23°C
22°C
21°C
20°C
2-1°C
2-2°C
0
0
5
4
MSB
0
0
0
SIGN
27
°C
2 °C
2 °C
LSB
23°C
22°C
21°C
20°C
2-1°C
2-2°C
0
0
MSB
TA TCRIT
TA TUPPER
TA TLOWER
SIGN
27°C
26°C
25°C
24°C
LSB
23°C
0
0
0
0
0
0
0
0
22°C
0
1
0
0
0
0
0
0
21°C
0
0
0
0
0
0
0
0
20°C
0
1
0
0
0
0
0
0
2-1°C
0
0
0
0
0
0
0
0
2-2°C
0
1
1
0
1
0
0
0
2-3°C
2-4°C
0
0
0
0
1
0
0
1
1
0
0
1
0
0
Resolution
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
DS20005192B-page 12
6
2 °C
2 °C
 2013 Microchip Technology Inc.
MCP9844
5.1.1
CAPABILITY REGISTER
This is a read-only register used to identify the
temperature sensor capability. For example, the
MCP9844 device is capable of providing temperature
at 0.25°C resolution, measuring temperature below
and above 0°C, providing ±1°C and ±2°C accuracy
over the active and monitor temperature ranges
(respectively) and providing user-programmable
temperature event boundary trip limits. Register 5-2
describes the Capability register. These functions are
described in further detail in the following sections.
REGISTER 5-2:
CAPABILITY REGISTER (READ-ONLY)  ADDRESS ‘0000 0000’b
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-1
R-1
R-1
SHDN Status
tOUT Range
—
R-0
R-1
Resolution
R-1
R-1
R-1
Meas. Range
Accuracy
Temp. Alarm
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
Event Output Status During Shutdown (SHDN Status):
0 = Event output remains in previous state. If the output asserts before shutdown command, it
remains asserted during shutdown.
1 = Event output deasserts during shutdown. After shutdown, it takes tCONV to reassert the event
output (power-up default)
bit 6
I2C™ Bus Time-Out (tOUT Range):
0 = Bus time-out range is 10 ms to 60 ms
1 = Bus time-out range is 25 ms to 35 ms (power-up default)
bit 5
Unimplemented: Read as ‘1’
bit 4-3
Resolution:
00 = 0.5°C
01 = 0.25°C (power-up default)
10 = 0.125°C
11 = 0.0625°C
These bits reflect the selected resolution (see Section 5.2.4 “Temperature Resolution”)
bit 2
Temperature Measurement Range (Meas. Range):
0 = TA 0 (decimal) for temperature below 0°C
1 = The part can measure temperature below 0°C (power-up default)
 2013 Microchip Technology Inc.
DS20005192B-page 13
MCP9844
CAPABILITY REGISTER (READ-ONLY)  ADDRESS ‘0000 0000’b (CONTINUED)
REGISTER 5-2:
bit 1
Accuracy:
0 = Accuracy ±2°C from +75°C to +95°C (Active Range) and ±3°C from +40°C to +125°C
(Monitor Range)
1 = Accuracy ±1°C from +75°C to +95°C (Active Range) and ±2°C from +40°C to +125°C
(Monitor Range)
bit 0
Temperature Alarm:
0 = No defined function (This bit will never be cleared or set to ‘0’)
1 = The part has temperature boundary trip limits (TUPPER/TLOWER/TCRIT registers) and a
temperature event output (JC 42.4 required feature)
1
2
3
4
5
6
7
8
1
A
2
A
1
A
0
W C
K
2
3
4
5
6
7
8
SCL
SDA
S
0 0 1 1
A
0 0 0 0 0 0 0 0
Address Byte
Capability Pointer
MCP9844
MCP9844
1
2
3
4
5
A
C
K
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCL
SDA
S
A
A
N
0 0 1 1 A A A R C 0 0 0 0 0 0 0 0 C 0 0 0 0 1 1 1 1 A P
2 1 0
K
Address Byte
MCP9844
K
MSB Data
K
LSB Data
Master
Master
FIGURE 5-2:
Timing Diagram for Reading the Capability Register (See Section 4.0 “Serial
Communication”).
DS20005192B-page 14
 2013 Microchip Technology Inc.
MCP9844
5.1.2
SENSOR CONFIGURATION
REGISTER (CONFIG)
The MCP9844 device has a 16-bit Configuration
register (CONFIG) that allows the user to set various
functions for a robust temperature monitoring system.
Bits 10 through 0 are used to select the event output
boundary hysteresis, device Shutdown or Low-Power
mode, temperature boundary and critical temperature
lock, and temperature event output enable/disable. In
addition, the user can select the event output condition
(output set for TUPPER and TLOWER temperature
boundary or TCRIT only), read event output status and
set event output polarity and mode (Comparator Output
or Interrupt Output mode).
Conversion or Shutdown mode is selected using bit 8.
In Shutdown mode, the band gap temperature sensor
circuit stops converting temperature and the Ambient
Temperature register (TA) holds the previous
successfully converted temperature data (see
Section 5.2.1 “Shutdown Mode”). Bits 7 and 6 are
used to lock the user-specified boundaries TUPPER,
TLOWER and TCRIT to prevent an accidental rewrite.
Bits 5 through 0 are used to configure the temperature
Event output pin. All functions are described in
Register 5-3 (see Section 5.2.3 “Event Output
Configuration”).
The temperature hysteresis bits 10 and 9 can be used
to prevent output chatter when the ambient
temperature gradually changes beyond the user
specified temperature boundary (see Section 5.2.2
“Temperature Hysteresis (THYST)”). The Continuous
CONFIGURATION REGISTER (CONFIG)  ADDRESS ‘0000 0001’b
REGISTER 5-3:
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
R/W-0
R/W-0
THYST
R/W-0
SHDN
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
Crit. Lock
Win. Lock
Int. Clear
Event Stat.
Event Cnt.
Event Sel.
Event Pol.
Event Mod.
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-11
Unimplemented: Read as ‘0’
bit 10-9
TUPPER and TLOWER Limit Hysteresis (THYST):
00 = 0°C (power-up default)
01 = 1.5°C
10 = 3.0°C
11 = 6.0°C
x = Bit is unknown
(Refer to Section 5.2.3 “Event Output Configuration”)
This bit can not be altered when either of the lock bits are set (bit 6 and bit 7).
This bit can be programmed in Shutdown mode.
bit 8
Shutdown Mode (SHDN):
0 = Continuous Conversion (power-up default)
1 = Shutdown (Low-Power mode)
In shutdown, all power-consuming activities are disabled, though all registers can be written to or read.
Event output will deassert.
This bit cannot be set ‘1’ when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared
‘0’ for Continuous Conversion while locked (Refer to Section 5.2.1 “Shutdown Mode”).
 2013 Microchip Technology Inc.
DS20005192B-page 15
MCP9844
REGISTER 5-3:
bit 7
CONFIGURATION REGISTER (CONFIG)  ADDRESS ‘0000 0001’b
TCRIT Lock Bit (Crit. Lock):
0 = Unlocked. TCRIT register can be written. (power-up default)
1 = Locked. TCRIT register can not be written
When enabled, this bit remains set ‘1’ or locked until cleared by internal reset (Section 5.3 “Summary
of Power-on Default”). This bit does not require a double-write.
This bit can be programmed in Shutdown mode.
bit 6
TUPPER and TLOWER Window Lock Bit (Win. Lock):
0 = Unlocked. TUPPER and TLOWER registers can be written. (power-up default)
1 = Locked. TUPPER and TLOWER registers can not be written
When enabled, this bit remains set ‘1’ or locked until cleared by power-on Respell (Section 5.3 “Summary of Power-on Default”). This bit does not require a double-write.
This bit can be programmed in Shutdown mode.
bit 5
Interrupt Clear (Int. Clear) Bit:
0 = No effect (power-up default)
1 = Clear interrupt output. When read this bit returns ‘0’
This bit clears the Interrupt flag which deasserts event output. In Shutdown mode, the event output is
always deasserted. Therefore, setting this bit in Shutdown mode clears the interrupt after the device
returns to normal operation.
bit 4
Event Output Status (Event Stat.) Bit:
0 = Event output is not asserted by the device (power-up default)
1 = Event output is asserted as a comparator/Interrupt or critical temperature output
In Shutdown mode this bit will clear because event output is always deasserted in Shutdown mode.
bit 3
Event Output Control (Event Cnt.) Bit:
0 = Event output Disabled (power-up default)
1 = Event output Enabled
This bit can not be altered when either of the lock bits is set (bit 6 and bit 7).
This bit can be programmed in Shutdown mode, but event output will remain deasserted.
bit 2
Event Output Select (Event Sel.) Bit:
0 = Event output for TUPPER, TLOWER and TCRIT (power-up default)
1 = TA ≥ TCRIT only. (TUPPER and TLOWER temperature boundaries are disabled.)
When the Alarm Window Lock bit is set, this bit cannot be altered until unlocked (bit 6).
This bit can be programmed in Shutdown mode, but event output will remain deasserted.
bit 1
Event Output Polarity (Event Pol.) Bit:
0 = Active-low (power-up default. Pull-up resistor required)
1 = Active-high
This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7).
This bit can be programmed in Shutdown mode, but event output will remain deasserted, see
Section 5.2.3 “Event Output Configuration”
bit 0
Event Output Mode (Event Mod.) Bit:
0 = Comparator output (power-up default)
1 = Interrupt output
This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7).
This bit can be programmed in Shutdown mode, but event output will remain deasserted.
DS20005192B-page 16
 2013 Microchip Technology Inc.
MCP9844
Writing to the CONFIG Register to Enable the Event Output pin <0000 0000 0000 1000>b.
1
2
3
4
5
6
7
8
1
A
2
A
1
A
0
W C
2
3
4
5
6
7
8
SCL
SDA
S
0 0 1 1
A
K
Address Byte
0 0 0 0 0 0 0 1
Configuration Pointer
MCP9844
MCP9844
1
A
C
K
2
3
4
5
6
7
8
0 0 0 0 0 0 0 0
1
A
C
K
2
3
4
5
6
7
8
0 0 0 0 1 0 0 0
MSB Data
A
C
K
P
LSB Data
MCP9844
MCP9844
Note: this is an example routine:
i2c_start();
// send START command
i2c_write(AddressByte & 0xFE);
//WRITE Command
i2c_write(0x01);
// Write CONFIG Register
i2c_write(0x00);
// Write data
i2c_write(0x08);
// Write data
i2c_stop();
// send STOP command
//also, make sure bit 0 is cleared ‘0’
FIGURE 5-3:
Timing Diagram for Writing to the Configuration Register (See Section 4.0 “Serial
Communication”.
 2013 Microchip Technology Inc.
DS20005192B-page 17
MCP9844
• Reading the CONFIG Register.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCL
SDA
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write.
Note:
S
0 0 1 1
A
2
A
1
A
A
0
W C
K
Address Byte
Configuration Pointer
MCP9844
MCP9844
1
2
3
4
A
C
K
0 0 0 0 0 0 0 1
5
6
7
8
1
A
2
A
1
A
0
R C
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCL
SDA
S
0 0 1 1
A
K
0 0 0 0 0 0 0 0
Address Byte
A
C
K
0 0 0 0 1 0 0 0
P
LSB Data
MSB Data
MCP9844
N
A
K
Master
Master
Note: this is an example routine:
i2c_start();
// send START command
i2c_write(AddressByte & 0xFE);
//WRITE Command
//also, make sure bit 0 is cleared ‘0’
i2c_write(0x01);
// Write CONFIG Register
i2c_start();
// send Repeat START command
i2c_write(AddressByte | 0x01);
//READ Command
//also, make sure bit 0 is set ‘1’
UpperByte = i2c_read(ACK);
// READ 8 bits
//and Send ACK bit
LowerByte = i2c_read(NAK);
// READ 8 bits
//and Send NAK bit
i2c_stop();
// send STOP command
FIGURE 5-4:
Timing Diagram for Reading from the Configuration Register (See Section 4.0
“Serial Communication”).
DS20005192B-page 18
 2013 Microchip Technology Inc.
MCP9844
5.1.3
UPPER/LOWER/CRITICAL
TEMPERATURE LIMIT REGISTERS
(TUPPER/TLOWER/TCRIT)
The MCP9844 device has a 16-bit read/write Event
Output Temperature Upper-Boundary Trip register
(TUPPER), a 16-bit Lower-Boundary Trip register
(TLOWER) and a 16-bit Critical Boundary Trip register
(TCRIT) that contains 11-bit data in two’s complement
format (0.25°C). This data represents the maximum
and minimum temperature boundary or temperature
window that can be used to monitor ambient
temperature. If this feature is enabled (Section 5.1.2
“Sensor Configuration Register (CONFIG)”) and the
ambient temperature exceeds the specified boundary
or window, the MCP9844 asserts an event output.
(Refer
to
Section 5.2.3
“Event
Output
Configuration”).
REGISTER 5-4:
UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER (TUPPER/TLOWER/
TCRIT)  ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b (Note 1)
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
Sign
27°C
26°C
25°C
24°C
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
23°C
22°C
21°C
20°C
2-1°C
2-2°C
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-13
Unimplemented: Read as ‘0’
bit 12
Sign:
0 = TA 0°C
1 = TA  0°C
bit 11-2
TUPPER/TLOWER/TCRIT:
Temperature boundary trip data in two’s complement format.
bit 1-0
Unimplemented: Read as ‘0’
x = Bit is unknown
Note 1: This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT located at ‘0000 0010b’,
‘0000 0011b’ and ‘0000 0100b’, respectively.
 2013 Microchip Technology Inc.
DS20005192B-page 19
MCP9844
Writing 90°C to the TUPPER Register <0000 0101 1010 0000>b.
1
2
3
4
5
6
7
8
0
0
1
1
A
2
A
1
A
0
W C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
1
0
SCL
SDA
S
A
K
Address Byte
A
C
K
TUPPER Pointer
MCP9844
MCP9844
1
2
3
4
5
6
7
8
0
0
0
0
0
1
0
1
A
C
K
1
2
3
4
5
6
7
8
1
0
1
0
0
0
0
0
MSB Data
A
C
K
P
LSB Data
MCP9844
MCP9844
• Reading from the TUPPER Register.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCL
It is not necessary to
select the Register
Pointer if it was set from
the previous read/write.
Note:
SDA
S
0
0
1
1
A
2
A
1
A
0
A
W C
K
0
Address Byte
0
0
0
0
0
1
0
A
C
K
TUPPER Pointer
MCP9844
MCP9844
1
2
3
4
5
6
7
8
0
0
1
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
0
0
0
0
1
0
1
1
2
3
4
5
6
7
8
1
0
1
0
0
0
0
0
SCL
SDA
S
A
K
Address Byte
A
C
K
P
LSB Data
MSB Data
MCP9844
N
A
K
Master
Master
FIGURE 5-5:
Timing Diagram for Writing and Reading from the TUPPER Register (See Section 4.0
“Serial Communication”).
DS20005192B-page 20
 2013 Microchip Technology Inc.
MCP9844
5.1.4
AMBIENT TEMPERATURE
REGISTER (TA)
The MCP9844 device uses a band gap temperature
sensor circuit to output analog voltage proportional to
absolute temperature. An internal  ADC is used to
convert the analog voltage to a digital word. The converter resolution is set to 0.25°C + sign (11-bit data).
The digital word is loaded to a 16-bit read-only Ambient
Temperature register (TA) that contains 11-bit
temperature data in two’s complement format.
In addition, the TA register uses three bits (bits 15, 14
and 13) to reflect the Event pin state. This allows the
user to identify the cause of the event output trigger
(see Section 5.2.3 “Event Output Configuration”);
bit 15 is set to ‘1’ if TA is greater than or equal to TCRIT,
bit 14 is set to ‘1’ if TA is greater than TUPPER and bit 13
is set to ‘1’ if TA is less than TLOWER.
The TA register bit assignment and boundary
conditions are described in Register 5-5.
The TA register bits (bits 12 through 0) are double-buffered. Therefore, the user can access the register while,
in the background, the MCP9844 performs an Analogto-Digital conversion. The temperature data from the
 ADC is loaded in parallel to the TA register at tCONV
refresh rate.
REGISTER 5-5:
R-0
AMBIENT TEMPERATURE REGISTER (TA)  ADDRESS ‘0000 0101’b (Note 1)
R-0
R-0
TA vs. TCRIT TA vs. TUPPER TA vs. TLOWER
R-0
R-0
R-0
R-0
R-0
SIGN
27 °C
26 °C
25 °C
24 °C
bit 15
bit 8
R-0
2
3 °C
R-0
R-0
R-0
R-0
R-0
R-0
R-0
22 °C
21 °C
20 °C
2-1 °C
2-2 °C
2-3 °C
2-4 °C
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
TA vs. TCRIT (1) Bit:
0 = TA TCRIT
1 = TA TCRIT
bit 14
TA vs. TUPPER (1) Bit:
0 = TA TUPPER
1 = TA TUPPER
bit 13
TA vs. TLOWER (1) Bit:
0 = TA TLOWER
1 = TA TLOWER
bit 12
SIGN Bit:
0 = TA 0°C
1 = TA  0°C
bit 11-0
Ambient Temperature (TA) Bits: (Note 2)
12-bit Ambient Temperature data in two’s complement format.
x = Bit is unknown
Note 1: Bits 15, 14 and 13 are not affected by the status of the event output configuration (bits 5 to 0 of CONFIG)
(Register 5-3).
2: Bits 2, 1, and 0 may remain clear ‘0’ depending on the status of the resolution register. The power-up
default is 0.25°C/bit, bits 1 and 0 remain clear ‘0’.
 2013 Microchip Technology Inc.
DS20005192B-page 21
MCP9844
5.1.4.1
TA bits to Temperature Conversion
EQUATION 5-1:
To convert the TA bits to decimal temperature, the
upper three boundary bits 15, 14 and 13) must be
masked out. Then determine the sign bit (bit 12) to
check positive or negative temperature, shift the bits
accordingly and combine the upper and lower bytes of
the 16-bit register. The upper byte contains data for
temperatures greater than 32°C while the lower byte
contains data for temperature less than 32°C, including
fractional data. When combining the upper and lower
bytes, the upper byte must be right-shifted by 4 bits (or
multiply by 24), and the lower byte must be left-shifted
by 4 bits (or multiply by 2-4). Adding the results of the
shifted values provides the temperature data in decimal
format, see Equation 5-1.
BYTES TO
TEMPERATURE
CONVERSION
Temperature  0°C
4
–4
T A =  UpperByte  2 + LowerByte  2 
Temperature  0°C
4
–4
T A =  UpperByte  2 + LowerByte  2  – 256
Where:
TA = Ambient Temperature (°C)
UpperByte = TA bit 15 to bit 8
LowerByte = TA bit 7 to bit 0
The temperature bits are in two’s compliment format;
therefore, positive temperature data and negative temperature data are computed differently. Equation 5-1
shows the temperature computation. The example
instruction code outlined in Figure 5-6 shows the
communication flow. Additionally, refer to Figure 5-7 for
the timing diagram.
This example routine assumes the variables and I2C™ communication subroutines are predefined:
i2c_start();
// send START command
i2c_write(AddressByte & 0xFE);
//WRITE Command
//also, make sure bit 0 is cleared ‘0’
i2c_write(0x05);
// Write TA Register Address
i2c_start();
//Repeat START
i2c_write(AddressByte | 0x01);
// READ Command
//also, make sure bit 0 is Set ‘1’
UpperByte = i2c_read(ACK);
// READ 8 bits
//and Send ACK bit
LowerByte = i2c_read(NAK);
// READ 8 bits
//and Send NAK bit
i2c_stop();
// send STOP command
//Convert the temperature data
//First Check flag bits
if ((UpperByte & 0x80) == 0x80){
//TA TCRIT
}
if ((UpperByte & 0x40) == 0x40){
//TA TUPPER
}
if ((UpperByte & 0x20) == 0x20){
//TA TLOWER
}
UpperByte = UpperByte & 0x1F;
//Clear flag bits
if ((UpperByte & 0x10) == 0x10){
//TA  0°C
UpperByte = UpperByte & 0x0F;
//Clear SIGN
Temperature = (UpperByte x 16 + LowerByte / 16) - 256;
//TA  0°C
}else
Temperature = (UpperByte x 16 + LowerByte / 16);
//Temperature = Ambient Temperature (°C)
FIGURE 5-6:
DS20005192B-page 22
Example Instruction Code.
 2013 Microchip Technology Inc.
MCP9844
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SDA
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write.
Note:
SCL
S
0
0
1
A
2
1
A
1
A
A
0
W C
K
0
0
0
Address Byte
0
0
1
0
A
C
K
1
TA Pointer
MCP9844
MCP9844
1
2
3
4
5
6
7
8
0
0
1
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
1
1
2
3
4
5
6
7
8
1
0
0
1
0
1
0
0
SCL
SDA
S
A
K
Address Byte
MCP9844
A
C
K
N
A
K
P
LSB Data
MSB Data
Master
Master
FIGURE 5-7:
Timing Diagram for Reading +25.25°C Temperature from the TA Register (See
Section 4.0 “Serial Communication”).
 2013 Microchip Technology Inc.
DS20005192B-page 23
MCP9844
5.1.5
MANUFACTURER ID REGISTER
This register is used to identify the manufacturer of the
device in order to perform manufacturer specific
operations. The Manufacturer ID for the MCP9844 is
0x0054 (hexadecimal).
MANUFACTURER ID REGISTER (READ-ONLY)  ADDRESS ‘0000 0110’b
REGISTER 5-6:
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
Manufacturer ID
bit 15
bit 8
R-0
R-1
R-0
R-1
R-0
R-1
R-0
R-0
Manufacturer ID
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
Device Manufacturer Identification Number
.
1
2
3
4
5
6
7
8
0
0
1
1
A
2
A
1
A
0
W C
K
1
2
3
4
5
6
7
8
SDA
S
0
0
0
0
0
1
1
0
A
Address Byte
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write.
Note:
SCL
A
C
K
Manuf. ID Pointer
MCP9844
MCP9844
1
2
3
4
5
6
7
8
0
0
1
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
1
2
3
4
5
6
7
8
0
1
0
1
0
1
0
0
SCL
SDA
S
A
K
Address Byte
MCP9844
A
C
K
N
A
K
P
LSB Data
MSB Data
Master
Master
FIGURE 5-8:
Timing Diagram for Reading the Manufacturer ID Register (See Section 4.0 “Serial
Communication”).
DS20005192B-page 24
 2013 Microchip Technology Inc.
MCP9844
5.1.6
DEVICE ID AND REVISION
REGISTER
The Device ID and Revision register located at Address
Pointer 0x08 is used to identify Microchip devices. The
upper byte of these registers is used to specify the
device identification and the lower byte is used to
specify device silicon revision. The device ID for the
MCP9844 is 0x06 (hex).
The revision (Lower Byte) begins with 0x00 (hex) for
the first release, with the number being incremented as
revised versions are released.
REGISTER 5-7:
R-0
TSE2004AV DEVICE ID AND DEVICE REVISION (READ-ONLY) 
ADDRESS ‘0000 0111’b AND ‘0000 1000’b
R-0
R-0
R-0
R-0
R-1
R-1
R-0
Device ID
bit 15
bit 8
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-1
Device Revision
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Device ID: Bit 15 to bit 8 are used for device ID
bit 7-0
Device Revision: Bit 7 to bit 0 are used for device revision
 2013 Microchip Technology Inc.
x = Bit is unknown
DS20005192B-page 25
MCP9844
5.1.7
RESOLUTION REGISTER
Note:
This register allows the user to change the sensor
resolution
(see
Section 5.2.4
“Temperature
Resolution”). The POR default resolution is 0.25°C.
The selected resolution is also reflected in the
Capability register (see Register 5-2).
REGISTER 5-8:
R/W-0
In order to prevent accidentally writing the
resolution register to a higher resolution
and exceeding the maximum temperature
conversion time of tCONV = 125 ms, a Shutdown command (using the CONFIG register) is required to change the resolution
register. The device must be in Shutdown
mode to change the resolution.
RESOLUTION REGISTER  ‘0000 1001’b
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
R/W-1
Resolution
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-2
Unimplemented: Read as ‘0’
bit 1-0
Resolution:
00 = LSb = 0.5°C (tCONV = 30 ms, typical)
01 = LSb = 0.25°C (power-up default, tCONV = 65 ms, typical)
10 = LSb = 0.125°C (tCONV = 130 ms, typical)
11 = LSb = 0.0625°C (tCONV = 260 ms, typical)
DS20005192B-page 26
x = Bit is unknown
 2013 Microchip Technology Inc.
MCP9844
5.2
5.2.1
SENSOR FEATURE DESCRIPTION
SHUTDOWN MODE
Shutdown mode disables all power-consuming
activities (including temperature sampling operations)
while leaving the serial interface active. This mode is
selected by setting bit 8 of CONFIG to ‘1’. In this mode,
the device consumes ISHDN. It remains in this mode
until bit 8 is cleared ‘0’ to enable Continuous
Conversion mode, or until power is recycled.
When the ambient temperature increases above the
critical temperature limit, the event output is forced to a
comparator output (regardless of bit 0 of CONFIG).
When the temperature drifts below the critical
temperature limit minus hysteresis, the event output
automatically returns to the state specified by bit 0 of
CONFIG.
The status of the event output can be read using bit 4
of CONFIG (Event status). This bit can not be set to ‘1’
in Shutdown mode.
The Shutdown bit (bit 8) cannot be set to ‘1’ while bits
6 and 7 of CONFIG (Lock bits) are set to ‘1’. However,
it can be cleared ‘0’ or returned to Continuous
Conversion while locked.
Bit 7 and 6 of the CONFIG register can be used to lock
the TUPPER, TLOWER and TCRIT registers. The bits
prevent false triggers at the event output due to an
accidental rewrite to these registers.
In Shutdown mode, all registers can be read or written.
However, the serial bus activity increases the shutdown
current.
The event output can also be used as a critical
temperature output using bit 2 of CONFIG (critical
output only). When this feature is selected, the event
output becomes a comparator output. In this mode, the
interrupt output configuration (bit 0 of CONFIG) is
ignored.
If the device is shutdown while the Event pin is
asserted, then the event output will be deasserted
during shutdown. It will remain deasserted until the
device is enabled for normal operation. Once the
device is enabled, it takes tCONV before the device
reasserts the event output.
5.2.2
TEMPERATURE HYSTERESIS
(THYST)
A hysteresis of 0°C, 1.5°C, 3°C or 6°C can be selected
for the TUPPER, TLOWER and TCRIT temperate
boundaries using bits 10 and 9 of CONFIG. The
hysteresis applies for decreasing temperature only (hot
to cold), or as temperature drifts below the specified
limit.
The hysteresis bits can not be changed if either of the
lock bits, bits 6 and 7 of CONFIG, are set to ‘1’.
The TUPPER, TLOWER and TCRIT boundary conditions
are described graphically in Figure 5-9.
5.2.3
EVENT OUTPUT CONFIGURATION
The event output can be enabled using bit 3 of
CONFIG (Event Output Control bit) and can be
configured as either a comparator output or as Interrupt
Output mode using bit 0 of CONFIG (Event mode). The
polarity can also be specified as an active-high or
active-low using bit 1 of CONFIG (event polarity). The
event output requires a pull-up resistor to function.
These configurations are designed to serve processors
with low-to-high or high-to-low edge triggered inputs.
With active-high configuration, when the event output
deasserts, power will be dissipated across the pull-up
resistor.
 2013 Microchip Technology Inc.
DS20005192B-page 27
MCP9844
5.2.3.1
Comparator Mode
Comparator mode is selected using bit 0 of CONFIG. In
this mode, the event output is asserted as active-high
or active-low using bit 1 of CONFIG. Figure 5-9 shows
the conditions that toggle the event output.
If the device enters Shutdown mode with asserted
event output, the output will deassert. It will remain
deasserted until the device enters Continuous Conversion mode and after the first temperature conversion is
completed, tCONV. After the initial temperature conversion, TA must satisfy the TUPPER or TLOWER boundary
conditions in order for event output to be asserted.
Comparator mode is useful for thermostat type
applications, such as turning on a cooling fan or
triggering a system shutdown when the temperature
exceeds a safe operating range.
5.2.3.2
Interrupt Mode
In Interrupt mode, the event output is asserted as activehigh or active-low (depending on the polarity
configuration) when TA drifts above or below TUPPER
and TLOWER limits. The output is deasserted by setting
bit 5 (Interrupt Clear) of CONFIG. If the device enters
Shutdown mode with asserted event output, the output
will deassert. It will remain deasserted until the device
enters Continuous Conversion mode and after the first
temperature conversion is completed, tCONV. If the interrupt clear bit (bit 5) is never set, then the event output will
reassert after the first temperature conversion.
5.2.4
TEMPERATURE RESOLUTION
The MCP9844 device is capable of providing temperature data with 0.5°C to 0.0625°C resolution. The
resolution can be selected using the Resolution
register (Register 5-8), which is located in address
‘00001001’b. This address location is not specified in
JEDEC Standard JC42.4. However, it provides
additional flexibility while being functionally compatible
with JC42.4 and provides a 0.25°C resolution at
125 ms (max.). In order to prevent accidentally changing the resolution and exceeding the 125 ms conversion time, the device must be in Shutdown mode to
change this register. The selected resolution can be
read by the user using bit 4 and bit 3 of the Capability
register (Register 5-2). A 0.25°C resolution is set as
POR default by the factory.
TABLE 5-2:
TEMPERATURE
CONVERSION TIME
Resolution
tCONV
(ms)
Samples/sec
(typical)
0.5°C
30
33
0.25°C
(Power-up default)
65
15
0.125°C
130
8
0.0625°C
260
4
In addition, if TA >= TCRIT, the event output is forced as
Comparator mode and asserts until TA < TCRIT - THYST.
While the event output is asserted, the user must send a
Clear Interrupt command (bit 5 of CONFIG) for the event
output to deassert when the temperature drops below the
critical limit, TA < TCRIT - THYST. Otherwise, the event output remains asserted (see Figure 5-9 for a graphical
description). Switching from Interrupt mode to Comparator mode also deasserts event output.
This mode is designed for interrupt driven microcontrollerbased systems. The microcontroller receiving the
interrupt will have to acknowledge the interrupt by setting
bit 5 of the CONFIG register from the MCP9844.
DS20005192B-page 28
 2013 Microchip Technology Inc.
MCP9844
TCRIT - THYST
TCRIT
TUPPER - THYST
TUPPER - THYST
TUPPER
TA
TLOWER - THYST
TLOWER
TLOWER -THYST
(Active-Low)
Event Output
Comparator
Interrupt
S/w Int. Clear
Critical Only
(Active-High)
Event Output
Comparator
Interrupt
S/w Int. Clear
Critical Only
2
Note: 1
TABLE 5-9:
3 5 6
7
4
2
TEMPERATURE EVENT OUTPUT CONDITIONS
Comparator
Note
4
1 3
Interrupt
Critical
TA Bits
Output Boundary Conditions
Output State (Active Low/High)
15
14
13
1
TA  TLOWER
High/Low
Low/High
High/Low
0
0
0
2
TA  TLOWER - THYST
TA  TUPPER
Low/High
Low/High
High/Low
0
0
1
Low/High
Low/High
High/Low
0
1
0
TA  TUPPER - THYST
TA  TCRIT
High/Low
Low/High
High/Low
0
0
0
Low/High
Low/High
Low/High
1
1
0
3
4
5
6
When TA  TCRIT, the event output is forced to Comparator mode and bits 0 of CONFIG (Event
Output mode) is ignored until TA  TCRIT - THYST. In Interrupt mode, if Interrupt is not cleared (bits 5
of CONFIG) as shown in the diagram at Note 6, then the event will remain asserted at Note 7 until
the Interrupt is cleared by the controller.
7
FIGURE 5-9:
TA  TCRIT - THYST
Low/High
High/Low
High/Low
0
1
0
Event Output Condition.
 2013 Microchip Technology Inc.
DS20005192B-page 29
MCP9844
5.3
Summary of Power-on Default
The MCP9844 has an internal Power-On Reset (POR)
circuit. If the power supply voltage VDD glitches down
to the VPOR_TS and VPOR_EE thresholds, the device
resets the registers to the power-on default settings.
Table 5-3 shows the power-on default summary for the
temperature sensor.
TABLE 5-3:
MCP9844 TEMPERATURE SENSOR POWER-ON RESET DEFAULTS
Registers
Address
(Hexadecimal)
Register Name
Default Register
Data (Hexadecimal)
Power-Up Default
Register Description
0x00
Capability
0x00EF
Event output deasserts in shutdown
I2C™ time out 25 ms to 35 ms.
Accepts VHV at A0 Pin
0.25°C Measurement Resolution
Measures temperature below 0°C
±1°C accuracy over active range
Temperature event output
0x01
CONFIG
0x0000
Comparator mode
Active-Low output
Event and critical output
Output disabled
Event not asserted
Interrupt cleared
Event limits unlocked
Critical limit unlocked
Continuous conversion
0°C Hysteresis
0x02
TUPPER
0x0000
0°C
0x03
TLOWER
0x0000
0°C
0x04
TCRIT
0x0000
0°C
0x05
TA
0x0000
0°C
0x06
Manufacturer ID
0x0054
—
0x07
Reserved
0x0601
—
0x08
Microchip
Device ID/ Device Revision
0x0601
—
0x09
Resolution
0x0001
Most Significant bit is set by default
0.25°C Measurement Resolution
DS20005192B-page 30
 2013 Microchip Technology Inc.
MCP9844
6.0
APPLICATIONS INFORMATION
6.1
Layout Considerations
6.2
Thermal Considerations
A potential for self-heating errors can exist if the
MCP9844 SDA, SCLK and event lines are heavily
loaded with pull-ups (high current). Typically, the selfheating error is negligible because of the relatively
small current consumption of the MCP9844. A
temperature accuracy error of approximately 0.5°C
could result from self-heating if the communication pins
sink/source the maximum current specified.
The MCP9844 device does not require any additional
components besides the master controller in order to
measure temperature. However, it is recommended
that a decoupling capacitor of 0.1 µF to 1 µF be used
between the VDD and GND pins. A high-frequency
ceramic capacitor is recommended. It is necessary for
the capacitor to be located as close as possible to the
power and ground pins of the device in order to provide
effective noise protection.
For example, if the event output is loaded to maximum
IOL, Equation 6-1 can be used to determine the effect
of self-heating.
In addition, good PCB layout is key for better thermal
conduction from the PCB temperature to the sensor
die. For good temperature sensitivity, add a ground
layer under the device pins as shown in Figure 6-1.
EQUATION 6-1:
EFFECT OF SELFHEATING
T  =  JA  V DD  I DD + V OL_Event  I OL_Event + V OL_SDA  I OL_SDA 
Where:
T = TJ - TA
TJ = Junction Temperature
TA = Ambient Temperature
JA = Package Thermal Resistance
VOL_Event, SDA = Event and SDA Output VOL
(0.4 Vmax)
IOL_Event, SDA = Event and SDA Output IOL
(3 mAmax and 20 mAmax,
respectively)
At room temperature (TA = +25°C) with maximum
IDD = 500 µA and VDD = 3.6V, the self-heating due to
power dissipation T is 0.58°C for the TDFN-8
package.
VDD
A0
Event
A1
EP9
FIGURE 6-1:
A2
SCL
GND
SDA
TDFN Package Layout.
 2013 Microchip Technology Inc.
DS20005192B-page 31
MCP9844
7.0
PACKAGING INFORMATION
7.1
Package Marking Information
Example:
8-Lead TDFN (2x3) (MCP9844)
Part Number
MCP9844T-BE/MNY
Code
ABS
ABS
310
25
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
DS20005192B-page 32
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
 2013 Microchip Technology Inc.
MCP9844
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
 2013 Microchip Technology Inc.
DS20005192B-page 33
MCP9844
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005192B-page 34
 2013 Microchip Technology Inc.
MCP9844
!""#$%&'
(
!
"#$%&"'""
($)
%
*++&&&!
!+$
 2013 Microchip Technology Inc.
DS20005192B-page 35
MCP9844
APPENDIX A:
REVISION HISTORY
Revision B (July 2014)
The following is the list of modifications.
1.
2.
3.
Updated the Serial Interface Timing Specifications section to include 400 kHz operation
from 1.7V to 3.6V.
Updated the Temperature Sensor DC Characteristics table.
Updated verbiage throughout the document.
Revision A (March 2013)
• Original Release of this Document.
DS20005192B-page 36
 2013 Microchip Technology Inc.
MCP9844
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
-X
/XX
Device
Temperature
Range
Package
Examples:
a)
Device:
MCP9844T:
Temperature Range:
E
Package:
MNY* = Plastic Dual Flat, No Lead, (2x3 TDFN),
8-lead (TDFN)
MCP9844T-BE/MNY:
Tape and Reel,
Extended temp.,
8LD 2x3 TDFN pkg.
Temperature Sensor
= -40°C to +125°C (Extended)
* Y = Nickel palladium gold manufacturing designator. Only
available on the TDFN package.
 2013 Microchip Technology Inc.
DS20005192B-page 37
MCP9844
NOTES:
DS20005192B-page 38
 2013 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
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SST, SST Logo, SuperFlash and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
The Embedded Control Solutions Company and mTouch are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,
CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit
Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,
KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo,
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Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
GestIC is a registered trademarks of Microchip Technology
Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2013-2014, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.
ISBN: 978-1-63276-397-6
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
== ISO/TS 16949 ==
 2013-2014 Microchip Technology Inc.
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS20005192B-page 39
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://www.microchip.com/
support
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2943-5100
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-3090-4444
Fax: 91-80-3090-4123
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
China - Beijing
Tel: 86-10-8569-7000
Fax: 86-10-8528-2104
Austin, TX
Tel: 512-257-3370
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Novi, MI
Tel: 248-848-4000
Houston, TX
Tel: 281-894-5983
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
New York, NY
Tel: 631-435-6000
San Jose, CA
Tel: 408-735-9110
Canada - Toronto
Tel: 905-673-0699
Fax: 905-673-6509
DS20005192B-page 40
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
China - Hangzhou
Tel: 86-571-8792-8115
Fax: 86-571-8792-8116
China - Hong Kong SAR
Tel: 852-2943-5100
Fax: 852-2401-3431
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
China - Shenzhen
Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
India - Pune
Tel: 91-20-3019-1500
Japan - Osaka
Tel: 81-6-6152-7160
Fax: 81-6-6152-9310
Germany - Dusseldorf
Tel: 49-2129-3766400
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Japan - Tokyo
Tel: 81-3-6880- 3770
Fax: 81-3-6880-3771
Germany - Pforzheim
Tel: 49-7231-424750
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Italy - Venice
Tel: 39-049-7625286
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
Poland - Warsaw
Tel: 48-22-3325737
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Sweden - Stockholm
Tel: 46-8-5090-4654
UK - Wokingham
Tel: 44-118-921-5800
Fax: 44-118-921-5820
Taiwan - Kaohsiung
Tel: 886-7-213-7830
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
03/25/14
 2013-2014 Microchip Technology Inc.