MCP9844 [MICROCHIP]
±1°C Accurate, 1.8V Digital Temperature Sensor; 为± 1A ° C精度， 1.8V的数字温度传感器
| 型号： | MCP9844 |
| 厂家： | 
MICROCHIP |
| 描述： | ±1°C Accurate, 1.8V Digital Temperature Sensor |
| 文件： | 总44页 (文件大小：903K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MCP9844
±1°C Accurate, 1.8V Digital Temperature Sensor
Features
Description
• 1MHz, 2-wire I2C™ Interface
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.
• User Selectable Measurement Resolution:
- +0.5°C, +0.25°C, +0.125°C, +0.0625°C
• User Programmable Temperature Limits:
- Temperature Window Limit
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 Low-
Power 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 active-
high comparator output for the thermostat operation, or
- 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
Temperature Sensor Features
• Temperature-to-Digital Converter (°C)
• Sensor Accuracy (Grade B):
as
a
temperature event interrupt output for
- ±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
microprocessor-based systems.
This sensor has an industry standard I2C Fast Mode
Plus compatible 1 MHz serial interface.
Typical Applications
Package Types
8-Pin 2x3 TDFN *
• Temperature sensing for Solid State Drive (SSD)
• General Purpose Temperature Datalog
• General Purpose
A0
A1
V
DD
1
2
8
7
Event
EP
9
• Industrial Applications
A2
SCL
SDA
3
4
6
5
• Industrial Freezers and Refrigerators
• Food Processing
GND
* Includes Exposed Thermal Pad (EP); see Table 3-1.
• Personal Computers and Servers
• PC Peripherals
• Consumer Electronics
• Handheld/Portable Devices
3.0
Spec. Limits
VDD = 1.7 V to 3.6 V
16 units
2.0
1.0
0.0
+Std. Dev.
-1.0
Average
-Std. Dev.
-2.0
-3.0
-40 -20
0
20
40
TA (°C)
60
80 100 120
2013 Microchip Technology Inc.
DS20005192A-page 1
MCP9844
†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.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
V
.................................................................................. 4.0V
DD
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 (T )...........................................+150°C
J
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
Conditions
Temperature Sensor Accuracy
+75°C < TA +95°C
+40°C < TA +125°C
-40°C < TA +125°C
Temperature Conversion Time
0.5°C/bit
TACY
-1.0 ±0.2
-2.0 ±0.5
+1.0
+2.0
+3.0
°C VDD = 1.8V
°C
°C
-3.0
±1
tCONV
—
—
—
—
30
65
—
125
—
ms
0.25°C/bit
ms 15 s/sec (typical) (See Section 5.2.4)
0.125°C/bit
130
260
ms
ms
0.0625°C/bit
—
Power Supply
Specified Voltage Range
Operating Current
VDD
IDD_TS
ISHDN
VPOR_TS
tPOR
1.7
—
—
—
—
—
—
—
100
0.2
1.5
—
3.6
500
1
V
µA
Shutdown Current
µA TA = 85°C
Power On Reset (POR)
Settling time after POR
Power Supply Rejection,
VDD = 1.7V, 2.5V, 3.3V
—
1
V
Threshold for falling VDD voltage
ms For warm and cold power cycles
°C DD = 1.7V to 3.6V
°C
0.2
±1
—
—
V
°C VDD_AC = VDD +150 mVPP AC
(0 to 1 MHz) and TA = +25°C,
Event Output (Open-Drain output, external pull-up resistor required), see Section 5.2.3
High-level Current (leakage)
Low-level Voltage
IOH
—
—
—
—
1
µA VOH = VDD
VOL
0.4
V
IOL= 3 mA (Active-Low, Pull-up
Resistor)
Thermal Response, from +25°C (Air) to +125°C (oil bath)
TDFN-8
tRES
—
0.7
—
s
Time to 63% (89°C)
DS20005192A-page 2
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
Conditions
Serial Input/Output (SCL, SDA, A0, A1, A2)
Input
High-level Voltage
VIH
0.7VDD
—
—
—
—
0.3VDD
±5
V
V
Low-level Voltage
VIL
IIN
Input Current
—
—
µA SDA and SCL only
M VIN > VIH
Input Impedance (A0, A1, A2)
Input Impedance (A0, A1, A2)
Output (SDA only)
Low-level Voltage
ZIN
ZIN
—
1
—
—
200
—
k VIN < VIL
VOL
IOH
IOL
—
—
3
—
—
—
—
5
0.4
1
V
IOL= 3 mA
High-level Current (leakage)
Low-level Current
µA VOH = VDD
mA VOL = 0.4V, VDD ≥ 2.2V
mA VOL = 0.6V
pF
20
—
—
6
Capacitance
CIN
—
SDA and SCL Inputs
Hysteresis
VHYST
TSP
—
—
0.05VDD
—
—
V
Spike Suppression
50
ns
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground,
and TA = -40°C to +125°C.
Parameters
Temperature Ranges
Sym
Min
Typ
Max
Units
Conditions
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 8L-TDFN
TA
TA
TA
-40
-40
-65
—
—
—
+125
+125
+150
°C
°C
°C
Note 1
JA
—
52.5
—
°C/W
Note 1: Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C).
2013 Microchip Technology Inc.
DS20005192A-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.
V
DD= 1.7V to 3.6V
VDD= 2.2V to 3.6V
400 kHz 1000 kHz
100 kHz
Parameters
Sym
Min
Max
Min
Max
Min
Max
Units
2-Wire I2C™ Interface
Serial port frequency (Note 2, 4)
Low Clock (Note 2)
fSCL
tLOW
tHIGH
tR
10
100
—
10
1300
600
20
400
—
10
500
260
—
1000
—
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
pf
4700
4000
—
High Clock
—
—
—
Rise time (Note 5)
1000
300
—
300
300
—
120
120
—
Fall time (Note 5)
tF
20
20
—
Data in Setup time (Note 3)
Data in Hold time (Note 6)
Data out Hold time (Note 4)
Start Condition Setup time
Start Condition Hold time
Stop Condition Setup time
Bus Idle/Free
tSU:DAT
tHD:DI
tHD:DO
tSU:STA
tHD:STA
tSU:STO
tB-FREE
tOUT
250
0
100
0
50
—
—
0
—
200
4700
4000
4000
4700
25
900
—
200
600
600
600
1300
25
900
—
0
350
—
260
260
260
500
25
—
—
—
—
—
—
—
—
—
Time out
35
35
35
Bus Capacitive load
Cb
—
—
—
400
—
100
Note 1: All values referred to VIL MAX and VIH MIN levels.
2: If tLOW > tOUT, the temperature sensor I2C™ interface will time out. A Repeat Start command is required
for communication.
3: 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
MAX + tSU:DAT MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I2C-bus specification)
before the SCL line is released.
4: 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.
5: Characterized but not production tested.
6: 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.
TIMING DIAGRAM
Start Condition
Data Transmission
Stop Condition
DS20005192A-page 4
2013 Microchip Technology Inc.
MCP9844
2.0
TYPICAL PERFORMANCE CURVES
Note:
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: Unless otherwise indicated, VDD = 1.7V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and
TA = -40°C to +125°C.
3.0
2.0
150
125
100
75
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
50
-40 -20
0
20
40
TA (°C)
60
80 100 120
-40 -20
0
20
40
TA (°C)
60
80 100 120
FIGURE 2-1:
Temperature Accuracy.
FIGURE 2-4:
Supply Current Vs.
Temperature.
100%
1.00
0.75
0.50
TA = +85 °C
VDD = 1.7 V - 3.6 V
16 units
75%
50%
25%
0%
.
0.00
-40 -20
0
20
40
60
80 100 120
TA (°C )
Temperature Accuracy (°C)
FIGURE 2-5:
Temperature.
Shutdown Current Vs.
FIGURE 2-2:
Histogram, TA = + 85 °C.
Temperature Accuracy
100%
1.8
1.6
1.4
1.2
1
TA = +25 °C
VDD = 1.7 V - 3.6 V
16 units
75%
Rising VDD
Falling VDD
50%
25%
0%
0.8
0.6
-40 -20
0
20
40
TA (°C)
60
80 100 120
Temperature Accuracy (°C)
FIGURE 2-6:
Voltage Vs. Temperature.
Power-on Reset Threshold
FIGURE 2-3:
Histogram, TA = + 25 °C.
Temperature Accuracy
2013 Microchip Technology Inc.
DS20005192A-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.
50
40
30
20
10
0.4
0.3
0.2
0.1
0
VOL = 0.6V
SDA, IOL = 20 mA
VDD = 2.2 V to 3.6 V
Event, IOL = 3 mA
-40 -20
0
20
40
60
80 100 120
-40 -20
0
20
40
60
80 100 120
TA (°C)
TA (°C)
FIGURE 2-7:
Event Output and SDA VOL
FIGURE 2-10:
SDA IOL Vs. Temperature.
Vs. Temperature.
3.0
2.0
200
175
0.0625 °C/LSb
0.125 °C/LSb
150
125
100
75
VDD = 1.7 V
VDD = 3.6 V
1.0
0.0
-1.0
-2.0
-3.0
50
0.25 °C/LSb
0.5 °C/LSb
25
0
-40 -20
0
20
40
60
80 100 120
-40 -20
0
20
40
TA (°C)
60
80 100 120
TA (°C)
FIGURE 2-11:
Temperature Accuracy Vs. Change in VDD
Line Regulation: Change in
FIGURE 2-8:
Rate Vs. Temperature.
Temperature Conversion
.
1.0
35
ꢀ°C/ꢀVDD, VDD = 2.5V + 100 mVPP (AC)
TA = 25 °C, 0.0625 °C/LSb
0.5
0.0
30
25
-1.0
No decoupling capacitor
1,000
10,000
100,000
00
M
1k
10k
100k
1M
-40 -20
0
20
40
TA (°C)
60
80 100 120
Frequency (Hz)
FIGURE 2-12:
I2C™ Protocol Time-out Vs.
FIGURE 2-9:
Power Supply Noise
Temperature.
Rejection: Normalized Temperature Vs. Power
Supply Frequency.
DS20005192A-page 6
2013 Microchip Technology Inc.
MCP9844
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
MCP9844
TDFN
PIN FUNCTION TABLES
Symbol
Description
1
2
3
4
5
6
7
8
9
A0
A1
Slave Address
Slave Address
Slave Address
Ground
A2
GND
SDA
SCL
Event
VDD
EP
Serial Data Line
Serial Clock Line
Temperature Alert Output
Power Pin
Exposed Thermal Pad (EP); can be connected to GND.
3.1
Address Pins (A0, A1, A2)
3.4
Serial Clock Line (SCL)
These pins are device address input pins.
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”.)
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.
TABLE 3-2:
Device
MCP9844 ADDRESS BYTE
3.5
Temperature Alert, Open-Drain
Output (Event)
Address Code
Slave
Address
The MCP9844 temperature Event output pin is an
open-drain output. The device outputs a signal when
the ambient temperature goes beyond the user pro-
grammed temperature limit. (See Section 5.2.3
“Event Output Configuration”.)
A6 A5 A4 A3 A2 A1 A0
X1 X1 X1
Sensor
0
0
1
1
Note 1: User selectable address is shown by X,
where X is ‘1’ or ‘0’ for VDD and GND,
respectively
3.6
Power Pin (V
)
DD
All address pins have an internal pull-down resistor.
VDD is the power pin. The operating voltage range, as
specified in the DC electrical specification table, is
applied on this pin.
3.2
Ground Pin (GND)
The GND pin is the system ground pin.
3.7
Exposed Thermal Pad (EP)
3.3
Serial Data Line (SDA)
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 Cir-
cuit Board (PCB). This provides better thermal conduc-
tion from the PCB to the die.
The SDA is a bidirectional input/output pin used to seri-
ally transmit data to/from the host controller. This pin
requires a pull-up resistor. (See Section 4.0 “Serial
Communication”.)
2013 Microchip Technology Inc.
DS20005192A-page 7
MCP9844
NOTES:
DS20005192A-page 8
2013 Microchip Technology Inc.
MCP9844
This device does not support sequential register read/
write. Each register needs to be addressed using the
Register Pointer.
4.0
4.1
SERIAL COMMUNICATION
2
2-Wire Standard Mode I C™
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 retain the
previously selected register. Therefore, they output
data from the previously specified register (repeated
pointer specification is not necessary).
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).
4.1.2
MASTER/SLAVE
The following MCP9844 bus protocol is defined in
Table 4-1.
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.
TABLE 4-1:
MCP9844 SERIAL BUS
PROTOCOL DESCRIPTIONS
Term
Description
Master
The device that controls the serial bus,
typically a microcontroller.
4.1.3
START/STOP CONDITION
Slave
The device addressed by the master,
such as the MCP9844.
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 low-
to-high transition of the SDA line (while SCL is high)
signifies a Stop condition.
Transmitter Device sending data to the bus.
Receiver
START
Device receiving data from the bus.
A unique signal from the master to
initiate serial interface with a slave.
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.
STOP
A unique signal from the master to
terminate serial interface from a slave.
Read/Write A read or write to the MCP9844
registers.
4.1.4
ADDRESS BYTE
ACK
A receiver Acknowledges (ACK) the
reception of each byte by polling the
bus.
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).
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.
Address Byte
SCL
SDA
1
0
2
0
3
1
4
1
5
6
7
8
9
A
C
K
4.1.1
DATA TRANSFER
A2 A1 A0
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).
Start
Slave
Address
Code
R/W
Address
MCP9844 Response
FIGURE 4-1:
Device Addressing.
Repeated communication is initiated after tB-FREE
.
2013 Microchip Technology Inc.
DS20005192A-page 9
MCP9844
4.1.5
DATA VALID
4.1.7
TIME OUT (TOUT)
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).
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 specifica-
tion.
4.1.6
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
t
H-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.
DS20005192A-page 10
2013 Microchip Technology Inc.
MCP9844
registers and a 2-wire I2C protocol compatible serial
interface. Figure 5-1 shows a block diagram of the
register structure.
5.0
FUNCTIONAL DESCRIPTION
The MCP9844 temperature sensors consist of a band-
gap type temperature sensor, a Delta-Sigma Analog-to-
Digital 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
Event Polarity
Event Comp/Int
Band-Gap
Temperature
Sensor
Configuration
Temperature
ADC
T
T
T
UPPER
LOWER
CRIT
0.5°C/bit
0.25°C/bit
0.125°C/bit
0.0625°C/bit
Manufacturer ID
Device ID/Rev
Resolution
Capability
Shutdown Status
2
I C™ Bus Time-out
Selected Resolution
Temp. Range
Accuracy
Output Feature
Register
Pointer
2
Standard I C
Interface
SCL
SDA
VDD
GND
A0
Event
A2
A1
FIGURE 5-1:
Functional Block Diagram.
2013 Microchip Technology Inc.
DS20005192A-page 11
MCP9844
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.
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 registers are accessed by sending a Register
Pointer to the MCP9844 using the serial interface. This
is an 8-bit write-only pointer. However, the four Least
Significant bits are used as pointers and all unused bits
(bits 7-4) need to be cleared or set to ‘0’. Register 5-1
describes the pointer or the address of each 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:
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
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 7-4
bit 3-0
Writable Bits: Write ‘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= Reserved (This device has additional registers that are reserved for test and calibration. If
these registers are accessed, the device may not perform according to the specification.)
DS20005192A-page 12
2013 Microchip Technology Inc.
MCP9844
TABLE 5-1:
BIT ASSIGNMENT SUMMARY FOR ALL TEMPERATURE SENSOR REGISTERS
(SEE SECTION 5.3)
Register
Pointer
(Hex)
Bit Assignment
MSB/
LSB
7
6
5
4
3
2
1
0
0x00
0x01
0x02
MSB
0
0
0
1
0
0
0
0
0
LSB SHDN Status tOUT Range
Resolution
Range Accuracy
Hysteresis
Event
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
0
0
Win Loc
0
0
0
0
SHDN
Crt Loc
Int Clr
Evt Stat Evt Cnt Evt Sel Evt Pol
Evt Mod
24°C
0
23°C
0
SIGN
20°C
SIGN
20°C
SIGN
20°C
27°C
2-1°C
27°C
2-1°C
27°C
2-1°C
27°C
2-1°C
0
26°C
2-2°C
26°C
2-2°C
26°C
2-2°C
26°C
2-2°C
0
25°C
22°C
21°C
0
21°C
0
25°C
0
24°C
0x03
0x04
0x05
0
23°C
0
22°C
0
22°C
0
25°C
0
24°C
0
23°C
0
21°C
0
25°C
2-3°C
0
24°C
2-4°C
TA TCRIT
TA TUPPER TA TLOWER SIGN
23°C
22°C
21°C
20°C
0x06
0x07
0x08
0x09
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
1
0
1
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
Resolution
2013 Microchip Technology Inc.
DS20005192A-page 13
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
—
R-0
R-1
R-1
R-1
R-1
SHDN Status tOUT Range
bit 7
Resolution
Meas Range
Accuracy
Temp Alarm
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15-8
bit 7
Unimplemented: Read as ‘0’
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 de-asserts during shutdown. After shutdown, it takes tCONV to re-assert 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)
DS20005192A-page 14
2013 Microchip Technology Inc.
MCP9844
REGISTER 5-2:
CAPABILITY REGISTER (READ-ONLY) ADDRESS ‘0000 0000’b (CONTINUED)
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
0
2
0
3
1
4
1
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
0
7
8
0
SCL
A
C
K
A
C
K
A
2
A
1
A
0
S
SDA
0
W
Address Byte
MCP9844
Capability Pointer
MCP9844
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
0
1
0
2
0
3
0
4
0
5
1
6
1
7
1
8
1
SCL
A
C
K
A
C
K
N
A
K
A
2
A
1
A
0
0
0
0
0
0
0
0
S
0
0
1
1
P
R
SDA
MSB Data
Address Byte
MCP9844
Timing Diagram for Reading the Capability Register (See Section 4.0 “Serial
LSB Data
Master
Master
FIGURE 5-2:
Communication”).
2013 Microchip Technology Inc.
DS20005192A-page 15
MCP9844
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
5.1.2
SENSOR CONFIGURATION
REGISTER (CONFIG)
The MCP9844 device has a 16-bit Configuration regis-
ter (CONFIG) that allows the user to set various func-
tions for a robust temperature monitoring system. Bits
10 through 0 are used to select the event output bound-
ary hysteresis, device Shutdown or Low-Power mode,
temperature boundary and critical temperature lock,
and temperature event output enable/disable. In addi-
tion, the user can select the event output condition (out-
put 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).
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
REGISTER 5-3:
CONFIGURATION REGISTER (CONFIG) ADDRESS ‘0000 0001’b
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0
R/W-0
R/W-0
SHDN
THYST
bit 15
bit 8
R/W-0
Crit. Lock
bit 7
R/W-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
Event Mod.
bit 0
Win. Lock
Int. Clear
Event Stat. Event Cnt.
Event Sel.
Event Pol.
Legend:
R = Readable bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
-n = Value at POR
bit 15-11
bit 10-9
Unimplemented: Read as ‘0’
TUPPER and TLOWER Limit Hysteresis (THYST):
00= 0°C (power-up default)
01= 1.5°C
10= 3.0°C
11= 6.0°C
(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.
Shutdown Mode (SHDN):
bit 8
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 de-assert.
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”).
DS20005192A-page 16
2013 Microchip Technology Inc.
MCP9844
REGISTER 5-3:
CONFIGURATION REGISTER (CONFIG) ADDRESS ‘0000 0001’b
bit 7
bit 6
bit 5
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.
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 “Sum-
mary of Power-on Default”). This bit does not require a double-write.
This bit can be programmed in Shutdown mode.
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 de-asserts event output. In Shutdown mode, the event output is
always de-asserted. Therefore, setting this bit in Shutdown mode clears the interrupt after the device
returns to normal operation.
bit 4
bit 3
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 de-asserted in shutdown mode.
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 de-asserted.
Event Output Select (Event Sel.) Bit:
bit 2
bit 1
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 de-asserted.
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 de-asserted, 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 de-asserted.
2013 Microchip Technology Inc.
DS20005192A-page 17
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
2
3
4
5
6
7
8
SCL
A
C
K
A
C
K
A
2
A
1
A
0
S
0
0
1
1
W
0
0
0
0
0
SDA
0
0
1
Address Byte
MCP9844
Configuration Pointer
MCP9844
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
1
0
2
0
3
0
4
0
5
1
6
0
7
0
8
0
A
C
K
A
C
K
P
MSB Data
LSB Data
MCP9844
MCP9844
Note: this is an example routine:
i2c_start();
// send START command
//WRITE Command
i2c_write(AddressByte & 0xFE);
//also, make sure bit 0 is cleared ‘0’
// Write CONFIG Register
// Write data
i2c_write(0x01);
i2c_write(0x00);
i2c_write(0x08);
i2c_stop();
// Write data
// send STOP command
FIGURE 5-3:
Timing Diagram for Writing to the Configuration Register (See Section 4.0 “Serial
Communication”.
DS20005192A-page 18
2013 Microchip Technology Inc.
MCP9844
• Reading the CONFIG Register.
1
2
3
4
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
Note:
It is not necessary to
select the register
pointer if it was set from
the previous read/write.
SCL
SDA
A
C
K
A
C
K
A
2
A
1
A
0
S
0
0
1
1
W
Address Byte
MCP9844
Configuration Pointer
MCP9844
1
0
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
0
2
3
0
4
0
5
1
6
0
7
0
8
0
SCL
A
C
K
A
C
K
N
A
K
A
2
A
1
A
0
0
0
0
0
0
0
0
0
0
S
0
1
1
R
P
SDA
Address Byte
LSB Data
MSB Data
Master
Master
MCP9844
Note: this is an example routine:
i2c_start();
// send START command
//WRITE Command
i2c_write(AddressByte & 0xFE);
//also, make sure bit 0 is cleared ‘0’
// Write CONFIG Register
// send Repeat START command
//READ Command
i2c_write(0x01);
i2c_start();
i2c_write(AddressByte | 0x01);
//also, make sure bit 0 is set ‘1’
// READ 8 bits
UpperByte = i2c_read(ACK);
LowerByte = i2c_read(NAK);
i2c_stop();
//and Send ACK bit
// READ 8 bits
//and Send NAK bit
// send STOP command
FIGURE 5-4:
Timing Diagram for Reading from the Configuration Register (See Section 4.0
“Serial Communication”).
2013 Microchip Technology Inc.
DS20005192A-page 19
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
CRIT) ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b (Note 1)
/
T
U-0
—
U-0
—
U-0
—
R/W-0
Sign
R/W-0
27°C
R/W-0
26°C
R/W-0
25°C
R/W-0
24°C
bit 15
bit 8
bit 0
R/W-0
23°C
R/W-0
22°C
R/W-0
21°C
R/W-0
20°C
R/W-0
2-1°C
R/W-0
2-2°C
U-0
—
U-0
—
bit 7
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15-13
bit 12
Unimplemented: Read as ‘0’
Sign:
0= TA 0°C
1= TA 0°C
bit 11-2
bit 1-0
TUPPER/TLOWER/TCRIT:
Temperature boundary trip data in two’s complement format.
Unimplemented: Read as ‘0’
Note 1: This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT located at ‘0000 0010b’,
‘0000 0011b’ and ‘0000 0100b’, respectively.
DS20005192A-page 20
2013 Microchip Technology Inc.
MCP9844
Writing 90°C to the TUPPER Register <0000 0101 1010 0000>b.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
0
7
1
8
0
SCL
A
C
K
A
C
K
A
2
A
1
A
0
S
0
0
1
1
W
0
0
0
0
0
SDA
Address Byte
MCP9844
TUPPER Pointer
MCP9844
1
0
2
0
3
0
4
0
5
0
6
1
7
0
8
1
1
1
2
0
3
1
4
0
5
0
6
0
7
0
8
A
C
K
A
C
P
0
K
MSB Data
LSB Data
MCP9844
MCP9844
• Reading from the TUPPER Register.
1
2
3
4
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
0
7
1
8
0
Note:
It is not necessary to
select the register
SCL
pointer if it was set from
the previous read/write.
A
C
K
A
C
K
A
2
A
1
A
0
S
0
0
1
1
SDA
W
Address Byte
MCP9844
TUPPER Pointer
MCP9844
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
1
2
0
3
1
4
0
5
0
6
0
7
0
8
0
SCL
A
A
C
K
N
A
K
A
2
A
1
A
0
C
0
0
0
0
0
1
0
1
S
0
0
1
1
R
P
SDA
K
Address Byte
LSB Data
MSB Data
Master
Master
MCP9844
FIGURE 5-5:
Timing Diagram for Writing and Reading from the TUPPER Register (See Section 4.0
“Serial Communication”).
2013 Microchip Technology Inc.
DS20005192A-page 21
MCP9844
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”);
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 con-
verter 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.
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-buff-
ered. Therefore, the user can access the register while,
in the background, the MCP9844 performs an analog-
to-digital conversion. The temperature data from the
ADC is loaded in parallel to the TA register at tCONV
refresh rate.
REGISTER 5-5:
AMBIENT TEMPERATURE REGISTER (TA) ADDRESS ‘0000 0101’b (Note 1)
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
TA vs. TCRIT TA vs. TUPPER TA vs. TLOWER
bit 15
SIGN
27 °C
26 °C
25 °C
24 °C
bit 8
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
23 °C
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
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15
bit 14
bit 13
bit 12
bit 11-0
TA vs. TCRIT (1) Bit:
0 = TA TCRIT
1 = TA TCRIT
TA vs. TUPPER (1) Bit:
0= TA TUPPER
1= TA TUPPER
TA vs. TLOWER (1) Bit:
0= TA TLOWER
1= TA TLOWER
SIGN Bit:
0= TA 0°C
1= TA 0°C
Ambient Temperature (TA) Bits: (Note 2)
12-bit Ambient Temperature data in two’s complement format.
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’.
DS20005192A-page 22
2013 Microchip Technology Inc.
MCP9844
5.1.4.1
TA bits to Temperature Conversion
EQUATION 5-1:
BYTES TO
TEMPERATURE
CONVERSION
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.
Temperature 0°C
TA = UpperByte 24 + LowerByte 2–4
Temperature 0°C
TA = 256 – UpperByte 24 + LowerByte 2–4
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 tem-
perature 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.
2
This example routine assumes the variables and I C communication subroutines are predefined:
i2c_start();
// send START command
//WRITE Command
i2c_write(AddressByte & 0xFE);
//also, make sure bit 0 is cleared ‘0’
i2c_write(0x05);
// Write T Register Address
A
i2c_start();
//Repeat START
i2c_write(AddressByte | 0x01);
// READ Command
//also, make sure bit 0 is Set ‘1’
// READ 8 bits
UpperByte = i2c_read(ACK);
LowerByte = i2c_read(NAK);
//and Send ACK bit
// READ 8 bits
//and Send NAK bit
// send STOP command
i2c_stop();
//Convert the temperature data
//First Check flag bits
if ((UpperByte & 0x80) == 0x80){
}
//T T
A
CRIT
if ((UpperByte & 0x40) == 0x40){
}
//T T
A
UPPER
LOWER
if ((UpperByte & 0x20) == 0x20){
}
//T T
A
UpperByte = UpperByte & 0x1F;
if ((UpperByte & 0x10) == 0x10){
UpperByte = UpperByte & 0x0F;
//Clear flag bits
//T 0°C
A
//Clear SIGN
Temperature = 256 - (UpperByte x 16 + LowerByte / 16);
}else
//T 0°C
A
Temperature = (UpperByte x 16 + LowerByte / 16);
//Temperature = Ambient Temperature (°C)
FIGURE 5-6:
Example Instruction Code.
2013 Microchip Technology Inc.
DS20005192A-page 23
MCP9844
1
2
3
4
1
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
1
7
0
8
1
Note:
It is not necessary to
select the register
pointer if it was set from
the previous read/write.
SCL
SDA
A
C
K
A
C
K
A
2
A
1
A
0
S
0
0
1
W
Address Byte
MCP9844
TA Pointer
MCP9844
1
2
3
4
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
1
1
1
2
0
3
4
1
5
0
6
1
7
0
8
0
SCL
A
C
K
A
C
K
N
A
K
A
2
A
1
A
0
S
0
0
1
1
R
0
P
SDA
Address Byte
MCP9844
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”).
DS20005192A-page 24
2013 Microchip Technology Inc.
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).
REGISTER 5-6:
MANUFACTURER ID REGISTER (READ-ONLY) ADDRESS ‘0000 0110’b
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
Manufacturer ID
bit 15
R-0
bit 8
bit 0
R-1
R-0
R-1
R-0
R-1
R-0
R-0
Manufacturer ID
bit 7
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15-0
.
Device Manufacturer Identification Number
1
0
2
0
3
1
4
1
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
1
7
1
8
0
Note:
It is not necessary to
select the register
pointer if it was set from
the previous read/write.
SCL
SDA
A
C
K
A
C
K
A
2
A
1
A
0
S
W
Address Byte
Manuf. ID Pointer
MCP9844
MCP9844
1
2
0
3
1
4
1
5
6
7
8
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
1
0
2
1
3
0
4
1
5
0
6
1
7
0
8
0
SCL
A
A
C
K
N
A
K
A
2
A
1
A
0
C
S
0
R
P
SDA
K
Address Byte
MCP9844
LSB Data
MSB Data
Master
Master
FIGURE 5-8:
Communication”).
Timing Diagram for Reading the Manufacturer ID Register (See Section 4.0 “Serial
2013 Microchip Technology Inc.
DS20005192A-page 25
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) and the silicon revision is 0x00.
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:
TSE2004AV DEVICE ID AND DEVICE REVISION (READ-ONLY)
ADDRESS ‘0000 0111’b AND ‘0000 1000’b
R-0
bit 15
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-1
R-1
R-0
R-1
Device ID
bit 8
bit 0
R-0
R-0
R-0
R-0
Device Revision
bit 7
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15-8
bit 7-0
Device ID: Bit 15 to bit 8 are used for device ID
Device Revision: Bit 7 to bit 0 are used for device revision
DS20005192A-page 26
2013 Microchip Technology Inc.
MCP9844
Note:
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 Shut-
down command (using the CONFIG regis-
ter) is required to change the resolution
register. The device must be in Shutdown
mode to change the resolution.
5.1.7
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).
RESOLUTION REGISTER
REGISTER 5-8:
RESOLUTION REGISTER ‘0000 1001’b
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
bit 15
U-0
bit 8
R/W-1
bit 0
U-0
U-0
U-0
U-0
R/W-0
Resolution
bit 7
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
Unimplemented: Read as ‘0’
Resolution:
bit 14-2
bit 1-0
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)
2013 Microchip Technology Inc.
DS20005192A-page 27
MCP9844
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.
5.2
SENSOR FEATURE DESCRIPTION
5.2.1
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.
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.
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.
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.
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.
In Shutdown mode, all registers can be read or written.
However, the serial bus activity increases the shutdown
current.
If the device is shutdown while the Event pin is
asserted, then the event output will be de-asserted
during shutdown. It will remain de-asserted 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
de-asserts, power will be dissipated across the pull-up
resistor.
DS20005192A-page 28
2013 Microchip Technology Inc.
MCP9844
5.2.3.1
Comparator Mode
5.2.4
TEMPERATURE RESOLUTION
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.
The MCP9844 device is capable of providing tempera-
ture data with 0.5°C to 0.0625°C resolution. The
Resolution can 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 chang-
ing the resolution and exceeding the 125 ms conver-
sion 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.
If the device enters Shutdown mode with asserted
event output, the output will de-assert. It will remain de-
asserted until the device enters Continuous Conver-
sion mode and after the first temperature conversion is
completed, tCONV. After the initial temperature conver-
sion, 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.
TABLE 5-2:
TEMPERATURE
CONVERSION TIME
5.2.3.2
Interrupt Mode
In Interrupt mode, the event output is asserted as active-
high or active-low (depending on the polarity
configuration) when TA drifts above or below TUPPER
and TLOWER limits. The output is de-asserted by setting
bit 5 (Interrupt Clear) of CONFIG. If the device enters
Shutdown mode with asserted event output, the output
will de-assert. It will remain de-asserted until the device
enters Continuous Conversion mode and after the first
temperature conversion is completed, tCONV. If the inter-
rupt clear bit (Bit 5) is never set, then the event output will
re-assert after the first temperature conversion.
tCONV
(ms)
Samples/sec
(typical)
Resolution
0.5°C
30
65
33
15
0.25°C
(Power-up default)
0.125°C
130
260
8
4
0.0625°C
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 de-assert 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 Compara-
tor mode also de-asserts event output.
This mode is designed for interrupt driven microcontroller
based systems. The microcontroller receiving the
interrupt will have to acknowledge the interrupt by setting
bit 5 of the CONFIG register from the MCP9844.
2013 Microchip Technology Inc.
DS20005192A-page 29
MCP9844
TCRIT - THYST
TUPPER - THYST
TCRIT
TUPPER - THYST
TUPPER
TA
TLOWER - THYST
TLOWER
TLOWER -THYST
Comparator
Interrupt
S/w Int. Clear
Critical Only
Comparator
Interrupt
S/w Int. Clear
Critical Only
Note:
2
1
4
3
3
5
1
6
7
4
2
TABLE 5-9:
TEMPERATURE EVENT OUTPUT CONDITIONS
Comparator Interrupt
Critical
TA Bits
14
Note
Output Boundary Conditions
Output State (Active Low/High)
15
13
1
2
3
4
5
6
TA TLOWER
TA TLOWER - THYST
TA TUPPER
High/Low
Low/High
Low/High
High/Low
Low/High
Low/High
Low/High
Low/High
Low/High
Low/High
High/Low
High/Low
High/Low
High/Low
Low/High
0
0
0
0
1
0
0
1
0
1
0
1
0
0
0
TA TUPPER - THYST
TA TCRIT
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
TA TCRIT - THYST
Low/High
High/Low
High/Low
0
1
0
FIGURE 5-9:
Event Output Condition.
DS20005192A-page 30
2013 Microchip Technology Inc.
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
Default Register
Power-up Default
Address
(Hexadecimal)
Data (Hexadecimal)
Register Description
Register Name
0x00
Capability
CONFIG
0x00EF
Event output de-asserts 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
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
0x03
0x04
0x05
0x06
0x07
0x08
TUPPER
TLOWER
0x0000
0x0000
0x0000
0x0000
0x0054
0x0601
0x0601
0°C
0°C
0°C
0°C
—
TCRIT
TA
Manufacturer ID
Reserved
—
Microchip
—
Device ID/ Device Revision
0x09
Resolution
0x0001
Most Significant bit is set by default
0.25°C Measurement Resolution
2013 Microchip Technology Inc.
DS20005192A-page 31
MCP9844
NOTES:
DS20005192A-page 32
2013 Microchip Technology Inc.
MCP9844
6.2
Thermal Considerations
6.0
6.1
APPLICATIONS INFORMATION
Layout 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 self-
heating error is negligible because of the relatively
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.
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.
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 SELF-
HEATING
T
= V
I
+ V
I
OL_Event OL_Event
+ V
I
OL_SDA OL_SDA
JA DD DD
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
DD = 500 µA and VDD = 3.6V, the self-heating due to
I
power dissipation T is 0.58°C for the TDFN-8
package.
VDD
A0
Event
A1
A2
EP9
SCL
SDA
GND
FIGURE 6-1:
TDFN Package Layout.
2013 Microchip Technology Inc.
DS20005192A-page 33
MCP9844
NOTES:
DS20005192A-page 34
2013 Microchip Technology Inc.
MCP9844
7.0
7.1
PACKAGING INFORMATION
Package Marking Information
Example:
8-Lead TDFN (2x3) (MCP9844)
Part Number
MCP9844T-BE/MNY
Code
ABS
ABS
310
25
Legend: XX...X Customer-specific information
Y
Year code (last digit of calendar year)
YY
WW
NNN
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
Pb-free JEDEC designator for Matte Tin (Sn)
*
This package is Pb-free. The Pb-free JEDEC designator (
can be found on the outer packaging for this package.
)
e3
Note: 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.
DS20005192A-page 35
MCP9844
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS20005192A-page 36
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.
DS20005192A-page 37
MCP9844
ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢍꢎꢄꢈꢆꢏꢈꢄꢊꢐꢆꢑꢒꢆꢂꢃꢄꢅꢆꢇꢄꢌꢓꢄꢔꢃꢆꢕꢖꢑꢗꢆꢘꢆꢙꢚꢛꢚꢜꢝꢞꢟꢆꢠꢠꢆꢡꢒꢅꢢꢆꢣꢤꢍꢏꢑꢥ
ꢑꢒꢊꢃꢦ ꢀꢁꢂꢃꢄꢅꢆꢃ!ꢁ"ꢄꢃꢇ#ꢂꢂꢆꢈꢄꢃꢉꢊꢇ$ꢊꢋꢆꢃ%ꢂꢊ&ꢌꢈꢋ"'ꢃꢉꢍꢆꢊ"ꢆꢃ"ꢆꢆꢃꢄꢅꢆꢃꢎꢌꢇꢂꢁꢇꢅꢌꢉꢃ(ꢊꢇ$ꢊꢋꢌꢈꢋꢃꢏꢉꢆꢇꢌ)ꢌꢇꢊꢄꢌꢁꢈꢃꢍꢁꢇꢊꢄꢆ%ꢃꢊꢄꢃ
ꢅꢄꢄꢉ*++&&&ꢐ!ꢌꢇꢂꢁꢇꢅꢌꢉꢐꢇꢁ!+ꢉꢊꢇ$ꢊꢋꢌꢈꢋ
DS20005192A-page 38
2013 Microchip Technology Inc.
MCP9844
APPENDIX A: REVISION HISTORY
Revision A (March 2012)
• Original Release of this Document.
2013 Microchip Technology Inc.
DS20005192A-page 39
MCP9844
NOTES:
DS20005192A-page 40
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.
Examples:
-X
PART NO.
Device
/XX
a)
MCP9844T-BE/MNY:
Tape and Reel,
Extended Temp.,
8LD 2x3 TDFN pkg.
Temperature
Range
Package
Device:
MCP9844T:
Single Op Amp (Tape and Reel)
Temperature Range:
Package:
E
= -40°C to +125°C (Extended)
MNY* = Plastic Dual Flat, No Lead, (2x3 TDFN),
8-lead (TDFN)
* Y = Nickel palladium gold manufacturing designator. Only
available on the TDFN package.
2013 Microchip Technology Inc.
DS20005192A-page 41
MCP9844
NOTES:
DS20005192A-page 42
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
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PIC logo, rfPIC, SST, SST Logo, SuperFlash
and UNI/O are registered trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
32
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O,
Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA
and Z-Scale are trademarks of 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.
GestIC and ULPP are 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, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 9781620770740
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
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.
== ISO/TS 16949 ==
2013 Microchip Technology Inc.
DS20005192A-page 43
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
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
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
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: 91-20-2566-1512
Fax: 91-20-2566-1513
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
Web Address:
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Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Japan - Osaka
Tel: 81-6-6152-7160
Fax: 81-6-6152-9310
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Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
China - Beijing
Tel: 86-10-8569-7000
Fax: 86-10-8528-2104
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Japan - Tokyo
Tel: 81-3-6880- 3770
Fax: 81-3-6880-3771
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Korea - Seoul
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Cleveland
Independence, OH
Tel: 216-447-0464
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Malaysia - Kuala Lumpur
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Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Detroit
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Tel: 248-538-2250
Fax: 248-538-2260
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
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Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Los Angeles
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Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-213-7828
Fax: 886-7-330-9305
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
China - Xiamen
Tel: 905-673-0699
Fax: 905-673-6509
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
11/29/12
DS20005192A-page 44
2013 Microchip Technology Inc.
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