Datasheet MCP9844 Datasheet

MCP9844

-1.0

0.0

1.0

2.0

3.0

rature Accuracy (°C)

VDD= 1.7 V to 3.6 V

16 units

Spec. Limits

+Std. Dev.

verage

-3.0

-2.0

-40 -20 0 20 40 60 80 100 120

Tem p

e

TA(°C)

g

-Std. Dev.

8-Pin 2x3 TDFN *

* Includes Exposed Thermal Pad (EP); see Tab le 3 -1 .

SCL

Event

SDA

A1

A2

1

2

3

4

8

7

6

5

GND

A0 V

DD

EP

9

±1°C Accurate, 1.8V Digital Temperature Sensor

Features

•1MHz, 2-wire I2C™ 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 V

Range: 1.7V to 3.6V

DD

• Operating Current: 100 µA (typical)

• Available Package: 8-Pin TDFN

Temperature Sensor Features

• Temperature-to-Digital Converter (°C)

• Sensor Accuracy (Grade B):

- ±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

• 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

Description

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.

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.

2

This sensor has an industry standard I

C Fast Mode

Plus compatible 1 MHz serial interface.

Package Types

A

 2013 Microchip Technology Inc. DS20005192A-page 1

MCP9844

1.0 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 (T

ESD protection on all pins (HBM:MM) ................. (4 kV:200V)

Latch-Up Current at each pin (25°C)........................ ±200 mA

)...........................................+150°C

J

†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.

TEMPERATURE SENSOR DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

= -40°C to +125°C.

and T

A

Parameters Sym Min Typ Max Unit Conditions

Temperature Sensor Accuracy

+75°C < T

 +95°C T

A

ACY

-1.0 ±0.2 +1.0 °C VDD=1.8V

+40°C < TA  +125°C -2.0 ±0.5 +2.0 °C

-40°C < T

 +125°C -3.0 ±1 +3.0 °C

A

Temperature Conversion Time

0.5°C/bit t

CONV

—30 — ms

0.25°C/bit — 65 125 ms 15 s/sec (typical) (See Section 5.2.4)

0.125°C/bit — 130 — ms

0.0625°C/bit — 260 — ms

Power Supply

Specified Voltage Range V

Operating Current I

DD_TS

Shutdown Current I

Power On Reset (POR) V

POR_TS

Settling time after POR t

Power Supply Rejection,

= 1.7V, 2.5V, 3.3V

V

DD

DD

SHDN

POR

°C — 0.2 — °C V

1.7 — 3.6 V

—100 500 µA

—0.2 1 µATA = 85°C

— 1.5 — V Threshold for falling VDD voltage

— — 1 ms For warm and cold power cycles

—±1 — °CV

Event Output (Open-Drain output, external pull-up resistor required), see Section 5.2.3

High-level Current (leakage) I

Low-level Voltage V

OH

OL

—— 1 µAV

—— 0.4 VIOL= 3 mA (Active-Low, Pull-up

Thermal Response, from +25°C (Air) to +125°C (oil bath)

TDFN-8 t

RES

— 0.7 — s Time to 63% (89°C)

= 1.7V to 3.6V, GND = Ground,

DD

= 1.7V to 3.6V

DD

DD_AC

(0 to 1 MHz) and T

= V

OH

Resistor)

= VDD +150 mV

= +25°C,

A

DD

PP AC

DS20005192A-page 2  2013 Microchip Technology Inc.

INPUT/OUTPUT PIN DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

T

= -40°C to +125°C.

A

Parameters Sym Min Typ Max Units Conditions

Serial Input/Output (SCL, SDA, A0, A1, A2)

Input

High-level Voltage V

Low-level Voltage V

Input Current I

Input Impedance (A0, A1, A2) Z

Input Impedance (A0, A1, A2) Z

IN

0.7V

IH

IL

IN

IN

Output (SDA only)

Low-level Voltage V

High-level Current (leakage) I

Low-level Current I

Capacitance C

OL

OH

OL

IN

SDA and SCL Inputs

Hysteresis V

Spike Suppression T

HYST

SP

= 1.7V to 3.6V, GND = Ground and

DD

DD

——0.3VDDV

— — ±5 µA SDA and SCL only

—1—M VIN > V

—200—k VIN < V

——0.4VI

—— 1µAV

3—20mAV

6——mAV

—5—pF

—0.05VDD—V

— — 50 ns

——V

OL

OH

OL

OL

MCP9844

IH

IL

= 3 mA

= V

DD

= 0.4V, VDD ≥ 2.2V

= 0.6V

TEMPERATURE CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

= -40°C to +125°C.

and T

A

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Specified Temperature Range T

Operating Temperature Range T

Storage Temperature Range T

Thermal Package Resistances

Thermal Resistance, 8L-TDFN 

Note 1: Operation in this range must not cause T

A

A

A

JA

to exceed Maximum Junction Temperature (+150°C).

J

= 1.7V to 3.6V, GND = Ground,

DD

-40 — +125 °C Note 1

-40 — +125 °C

-65 — +150 °C

— 52.5 — °C/W

 2013 Microchip Technology Inc. DS20005192A-page 3

MCP9844

t

S

U:STO

t

SU:

D

I

t

SU:DI

t

SU:STO

t

B:FRE

E

S

CL

SDA

t

H

D

:D

I

/

t

HD

:

DO

t

HI

GH

t

L

OW

t

OU

T

t

R

,

t

F

Start Condition Data Transmission

Stop Condition

SERIAL INTERFACE TIMING SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, GND = Ground, T

Note 1.

V

= 1.7V to 3.6V VDD= 2.2V to 3.6V

DD

100 kHz 400 kHz 1000 kHz

Parameters Sym Min Max

2-Wire I

Serial port frequency (Note 2, 4)f
Low Clock (Note 2)t

High Clock t

Rise time

Fall time (Note 5)t
Data in Setup time (Note 3)t
Data in Hold time (Note 6)t
Data out Hold time (Note 4)t

Start Condition Setup time t

Start Condition Hold time t

Stop Condition Setup time t

Bus Idle/Free t

Time out t

Bus Capacitive load C

Note 1: All values referred to V

2

C™ Interface

SCL

LOW

SU:DAT

HD:DO

SU:STA

HD:STA

SU:STO

B-FREE

IL MAX

HIGH

R

F

HD:DI

OUT

b

and V

(Note 5)t

> t

2: If t

LOW

, the temperature sensor I2C™ interface will time out. A Repeat Start command is required

OUT

10 100 10 400 10 1000 kHz

4700 — 1300 — 500 — ns

4000 — 600 — 260 — ns

— 1000 20 300 — 120 ns

20 300 20 300 — 120 ns

250 — 100 —50—ns

0— 0 —0—ns

200 900 200 900 0 350 ns

4700 — 600 — 260 — ns

4000 — 600 — 260 — ns

4000 — 600 — 260 — ns

4700 — 1300 — 500 — ns

25 35 25 35 25 35 ms

—— — 400 — 100 pf

levels.

IH MIN

for communication.

3: This device can be used in a Standard mode I

2

C-bus system, but the requirement t

be met. This device does not stretch SCL Low period. It outputs the next data bit to the SDA line within t

MAX

+ t

SU: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 t

region (min. 200 ns) of the falling edge of SCL t

to avoid unintended generation of Start or Stop

F MAX

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 t

SCL toggles Low.

= -40°C to +125°C, and CL = 80 pF

A

Min Max Min Max Units

HD:DAT MIN

 250 ns must

SU:DAT

to bridge the undefined

0 ns after

HD:DI

R

TIMING DIAGRAM

DS20005192A-page 4  2013 Microchip Technology Inc.

MCP9844

-1.0

0.0

1.0

2.0

3.0

rature Accuracy (°C)

VDD= 1.7 V to 3.6 V

16 units

Spec. Limits

+Std. Dev.

verage

-3.0

-2.0

-40 -20 0 20 40 60 80 100 120

Tem p

e

TA(°C)

g

-Std. Dev.

25%

50%

75%

100%

Occurrences

TA= +85 °C
V

DD

= 1.7 V - 3.6 V

16 units

0%

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

Temperature Accuracy (°C)

25%

50%

75%

100%

Occurrences

TA= +25 °C
V

DD

= 1.7 V - 3.6 V

16 units

0%

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

Temperature Accuracy (°C)

100

125

150

I

DD

(μA)

50

75

-40 -20 0 20 40 60 80 100 120
T

A

(°C)

0.50

0.75

1.00

I

SHDN

(μA)

0.00

0.25

-40 -20 0 20 40 60 80 100 120
T

A

(°C )

1

1.2

1.4

1.6

1.8

V

POR

(V)

Falling V

DD

Rising V

DD

0.6

0.8

-40 -20 0 20 40 60 80 100 120
T

A

(°C)

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, V

= -40°C to +125°C.

T

A

A

= 1.7V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and

DD

FIGURE 2-1: Temperature Accuracy.

FIGURE 2-4: Supply Current Vs.

Temperature.

FIGURE 2-2: Temperature Accuracy
Histogram, T

FIGURE 2-3: Temperature Accuracy
Histogram, T

 2013 Microchip Technology Inc. DS20005192A-page 5

= + 85 °C.

A

= + 25 °C.

A

FIGURE 2-5: Shutdown Current Vs. Temperature.

FIGURE 2-6: Power-on Reset Threshold Voltage Vs. Temperature.

MCP9844

0.2

0.3

0.4

nt & SDA V

OL

(V)

SDA, IOL= 20 mA
V

DD

= 2.2 V to 3.6 V

0

0.1

-40 -20 0 20 40 60 80 100 120

Ev

e

TA(°C)

Event, IOL= 3 mA

75

100

125

150

175

200

t

CONV

(ms)

0.0625 °C/LSb

0.125 °C/LSb

0

25

50

-40 -20 0 20 40 60 80 100 120
T

A

(°C)

0.25 °C/LSb

0.5 °C/LSb

-

0.0

0.5

1.0

lized Temp. Error (°C)

°C/VDD, VDD= 2.5V + 100 mV

PP (AC)

TA= 25 °C, 0.0625 °C/LSb

-1.0

0.5

1,000 10,000 100,000 1,000,000

Norm

a

Frequency (Hz)

1M1M1M1M

No decoupling capacitor

1k 10k 100k

1M

30

40

50

SDA I

OL

(mA)

VOL= 0.6V

10

20

-40 -20 0 20 40 60 80 100 120
T

A

(°C)

-1.0

0.0

1.0

2.0

3.0

ized Temp. Error (°C)

VDD= 1.7 V
V

DD

= 3.6 V

-3.0

-2.0

-40 -20 0 20 40 60 80 100 120

Norma

l

TA(°C)

30

35

Bus t

OUT

(ms)

25

-40 -20 0 20 40 60 80 100 120

I

2

C

TA(°C)

Note: Unless otherwise indicated, V

= -40°C to +125°C.

T

A

= 1.7V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and

DD

FIGURE 2-7: Event Output and SDA VOL Vs. Temperature.

FIGURE 2-10: SDA IOL Vs. Temperature.

FIGURE 2-8: Temperature Conversion

Rate Vs. Temperature.

FIGURE 2-9: Power Supply Noise Rejection: Normalized Temperature Vs. Power Supply Frequency.

DS20005192A-page 6  2013 Microchip Technology Inc.

FIGURE 2-11: Line Regulation: Change in
Temperature Accuracy Vs. Change in V

DD

.

FIGURE 2-12: I2C™ Protocol Time-out Vs. Temperature.

3.0 PIN DESCRIPT ION

The descriptions of the pins are listed in Tab le 3 -1 .

TABLE 3-1: PIN FUNCTION TABLES

MCP9844

MCP9844

TDFN

1 A0 Slave Address

2 A1 Slave Address

3 A2 Slave Address

4 GND Ground

5 SDA Serial Data Line

6 SCL Serial Clock Line

7 Event Temperature Alert Output

8V

9 EP Exposed Thermal Pad (EP); can be connected to GND.

3.1 Address Pins (A0, A1, A2)

These pins are device address input pins.

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 Ta bl e 3 -2 .

TABLE 3-2: MCP9844 ADDRESS BYTE

Device Address Code Slave

Sensor 0 0 1 1 X1X1X

Note 1: User selectable address is shown by X,

where X is ‘1’ or ‘0’ for V
respectively

Symbol Description

DD

Power Pin

3.4 Serial Clock Line (SCL)

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”.)

3.5 Temperature Alert, Open-Drain Output (Event)

Address

A6 A5 A4 A3 A2 A1 A0

and GND,

DD

1

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”.)

3.6 Power Pin (VDD)

All address pins have an internal pull-down resistor.

3.2 Ground Pin (GND)

The GND pin is the system ground pin.

VDD is the power pin. The operating voltage range, as
specified in the DC electrical specification table, is
applied on this pin.

3.7 Exposed Thermal Pad (EP)

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”.)

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.

 2013 Microchip Technology Inc. DS20005192A-page 7

MCP9844

NOTES:

DS20005192A-page 8  2013 Microchip Technology Inc.

MCP9844

123456789

SCL

SDA

0 0 1 1 A2 A1 A0

Start

Address Byte

Slave

Address

R/W

MCP9844 Response

Code

Address

A
C
K

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 I

communication port (refer to the Input/Output Pin DC

Characteristics table and the Serial Interface Timi ng
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.

2

C compatible

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 retain 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 V
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).

‘1’ or GND ‘0’. The 7-bit address

DD

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 t

 2013 Microchip Technology Inc. DS20005192A-page 9

B-FREE

.

FIGURE 4-1: Device Addressing.

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
t

SU-DATA

Serial Interface Timing Specifications table).

before SCL toggles from low-to-high (see

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
t

SU-DATA

the master. SDA also needs to remain pulled down for
t

H-DATA

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.

before the low-to-high transition of SCL from

after a high-to-low transition of SCL.

4.1.7 TIME OUT (T

If the SCL stays low or high for time specified by t
the MCP9844 resets the serial interface. This dictates
the minimum clock speed as specified in the specifica­tion.

OUT

)

OUT

,

DS20005192A-page 10  2013 Microchip Technology Inc.

MCP9844

Clear Event

0.5°C/bit

0.25°C/bit

0.125°C/bit

0.0625°C/bit

Temperature

T

UPPER

T

LOWER

Configuration

 ADC

Band-Gap

Temperature

Sensor

Event Status

Output Control

Critical Event only

Event Polarity

Event Comp/Int

T

CRIT

Capability

Temp. Range

Accuracy

Output Feature

Register

Pointer

Critical Trip Lock

Alarm Win. Lock Bit

Shutdown

Hysteresis

Manufacturer ID

Resolution

Device ID/Rev

Selected Resolution

Standard I2C

Interface

A0

A1

A2

Event

SDA

SCL

V

DD

GND

I2C™ Bus Time-out

Shutdown Status

MCP9844 Temperature Sensor

5.0 FUNCTIONAL DESCRIPTION

The MCP9844 temperature sensors consist of a band­gap type temperature sensor, a Delta-Sigma Analog-to­Digital Converter ( ADC), user programmable

registers and a 2-wire I

2

C protocol compatible serial
interface. Figure 5-1 shows a block diagram of the
register structure.

FIGURE 5-1: Functional Block Diagram.

 2013 Microchip Technology Inc. DS20005192A-page 11

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 t
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.

CONV

. The Event

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. 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.

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 (T
0011 = Event Temperature Lower-Boundary Trip register (T
0100 = Critical Temperature Trip register (T
0101 = Temperature register (T
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.)

)

A

CRIT

)

UPPER

LOWER

)

)

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)

MSB/

LSB

76543210

0x00 MSB 0 0 0 0 0 0 0 0

LSB SHDN Status t

Range 1 Resolution Range Accuracy Event

OUT

0x01 MSB 0 0 0 0 0 Hysteresis SHDN

LSB Crt Loc Win Loc Int Clr Evt Stat Evt Cnt Evt Sel Evt Pol Evt Mod

0x02

0x03 MSB

0x04 MSB

0x05 MSB

MSB 0 0 0 SIGN 27°C 26°C 25°C 24°C

LSB

23°C 22°C 21°C 20°C 2-1°C 2-2°C 0 0

000SIGN2

LSB

3

°C 22°C 21°C 20°C 2-1°C 2-2°C 0 0

2

000SIGN2

LSB

LSB

23°C 22°C 21°C 20°C 2-1°C 2-2°C 0 0

T

T

A

CRIT

3

2

°C 22°C 21°C 20°C 2-1°C 2-2°C 2-3°C 2-4°C

TA T

UPPERTA

0x06 MSB 0 0 0 0 0 0 0 0

LSB 0 1 0 1 0 1 0 0

0x07 MSB 0 0 0 0 0 1 1 0

LSB 0 0 0 0 0 0 0 1

0x08 MSB 0 0 0 0 0 1 1 0

LSB 0 0 0 0 0 0 0 1

0x09 MSB 0 0 0 0 0 0 0 0

LSB 0 0 0 0 0 0 Resolution

Bit Assignment

T

LOWER

7

°C 26°C 25°C 24°C

7

°C 26°C 25°C 24°C

SIGN 27°C 26°C 25°C 24°C

 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 t

bit 7 bit 0

Range — Resolution Meas Range Accuracy Temp Alarm

OUT

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 de-asserts during shutdown. After shutdown, it takes t

output (power-up default)

2

bit 6 I

bit 5 Unimplemented: Read as ‘1’
bit 4-3 Resolution:

bit 2 Temperature Measurement Range (Meas. Range):

C Bus time-out (t

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)

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”)

0 =TA 0 (decimal) for temperature below 0°C
1 = The part can measure temperature below 0°C (power-up default)

OUT

Range):

to re-assert the event

CONV

DS20005192A-page 14  2013 Microchip Technology Inc.

MCP9844

SDA

A
C
K

0011

A

Capability Pointer

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

A
C
K

0011

A

MSB Data

A
C
K

N
A
K

S P

2A1A0

12345678 12345678 12345678

Address Byte

LSB Data

R

MCP9844

MCP9844

MCP9844

Master

Master

W

SDA

SCL

000

00000

000 00001

111

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 Tempe r ature A larm:

0 = No defined function (This bit will never be cleared or set to ‘0’)
1 = The part has temperature boundary trip limits (T

temperature event output (JC 42.4 required feature)

UPPER/TLOWER/TCRIT

registers) and a

FIGURE 5-2: Timing Diagram for Reading the Capability Register (See Section 4.0 “Serial

Communication”).

 2013 Microchip Technology Inc. DS20005192A-page 15

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 T
or T

only), read event output status and set event

CRIT

UPPER

and T

temperature boundary

LOWER

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 T
T

LOWER

and T

to prevent an accidental rewrite.

CRIT

UPPER

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”).

output polarity and mode (Comparator Output or
Interrupt Output mode).

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 (T

REGISTER 5-3: CONFIGURATION REGISTER (CONFIG)  ADDRESS ‘0000 0001’b

)”). The Continuous

HYST

U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0 R/W-0

————— T

HYST

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 x = Bit is unknown

bit 15-11 Unimplemented: Read as ‘0’
bit 10-9 T

UPPER

and T

Limit Hysteresis (T

LOWER

HYST

):

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.

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 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 T

Lock Bit (Crit. Lock):

CRIT

0 = Unlocked. T
1 =Locked. T

CRIT

register can be written. (power-up default)

CRIT

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 T

and T

UPPER

0 = Unlocked. T
1 =Locked. T

Window Lock Bit (Win. Lock):

LOWER

UPPER

UPPER

and T

and T

LOWER

registers can be written. (power-up default)

LOWER

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.

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 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 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.

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 de-asserted.

bit 2 Event Output Select (Event Sel.) Bit:

0 = Event output for T
1 = T

A

≥ T

CRIT

only. (T

UPPER

UPPER

, T

LOWER

and T

LOWER

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.

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 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.

and T

(power-up default)

CRIT

temperature boundaries are disabled.)

 2013 Microchip Technology Inc. DS20005192A-page 17

MCP9844

Writing to the CONFIG Register to Enable the Event Output pin <0000 0000 0000 1000>b.

SDA

A
C
K

0011

A

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

W

MCP9844

MCP9844

MSB Data

A
C
K

A
C
K

P

12345678 12345678

LSB Data

Configuration Pointer

MCP9844 MCP9844

001

00000

000 00001

000

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_write(0x00); // Write data

i2c_write(0x08); // Write data

i2c_stop(); // 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.

SDA

A
C
K

0011

A

Configuration Pointer

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

A
C
K

0011

A

MSB Data

A
C
K

N
A
K

S P

2A1A0

12345678 12345678 12345678

Address Byte

LSB Data

R

MCP9844

MCP9844

MCP9844

Master

Master

W

SDA

SCL

001

00000

000 00001

000

• Reading the CONFIG Register.

Note: It is not necessary to

select the register
pointer if it was set from
the previous read/write.

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

MCP9844

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
(T

UPPER/TLOWER/TCRIT

The MCP9844 device has a 16-bit read/write Event
Output Temperature Upper-Boundary Trip register
(T
(T
(T

), a 16-bit Lower-Boundary Trip register

UPPER

) and a 16-bit Critical Boundary Trip register

LOWER

) that contains 11-bit data in two’s complement

CRIT

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 (T

T

)  ADDRESS ‘0000 0010’b/‘0000 0011’b/‘0000 0100’b (Note 1)

CRIT

U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0

———Sign2

bit 15 bit 8

)

UPPER/TLOWER

7

°C 26°C 25°C 24°C

/

R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0

3

°C 22°C 21°C 20°C 2-1°C 2-2°C — —

2

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 15-13 Unimplemented: Read as ‘0’
bit 12 Sign:

0 =T
1 =T

bit 11-2 T

0°C

A

 0°C

A

UPPER/TLOWER/TCRIT

:

Temperature boundary trip data in two’s complement format.

bit 1-0 Unimplemented: Read as ‘0’

Note 1: This table shows two 16-bit registers for T

UPPER

, T

LOWER

and T

located at ‘0000 0010b’,

CRIT

‘0000 0011b’ and ‘0000 0100b’, respectively.

DS20005192A-page 20  2013 Microchip Technology Inc.

MCP9844

SDA

A
C
K

0011

A

T

UPPER

Pointer

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

A
C
K

0011

A

MSB Data

A
C
K

N
A
K

S P

2A1A0

12345678 12345678 12345678

Address Byte

LSB Data

R

MCP9844

MCP9844

MCP9844

Master

Master

W

SDA

SCL

010

00000

101 10100

000

• Reading from the T

UPPER

Register.

Writing 90°C to the T

UPPER

Register <0000 0101 1010 0000>b.

SDA

A
C
K

0011

A

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

W

MCP9844

MCP9844

MSB Data

A
C
K

A
C
K

P

12345678 12345678

LSB Data

T

UPPER

Pointer

MCP9844

MCP9844

010

00000

101 10100

000

Note: It is not necessary to

select the register
pointer if it was set from
the previous read/write.

FIGURE 5-5: Timing Diagram for Writing and Reading from the T

“Serial Communication”).

 2013 Microchip Technology Inc. DS20005192A-page 21

UPPER

Register (See Section 4.0

MCP9844

5.1.4 AMBIENT TEMPERATURE
REGISTER (T

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

)

A

(TA) that contains 11-bit

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 T
bit 14 is set to ‘1’ if T
is set to ‘1’ if T

The T

register bit assignment and boundary

A

is greater than or equal to T

A

is greater than T

A

is less than T

A

LOWER

UPPER

.

CRIT

and bit 13

conditions are described in Register 5-5.

temperature data in two’s complement format.

register bits (bits 12 through 0) are double-buff-

The T

A

ered. 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 T

register at t

A

CONV

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

T

A

vs. T

CRITTA

vs. T

UPPERTA

vs. T

LOWER

SIGN 27 °C 26 °C 25 °C 24 °C

bit 15 bit 8

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0

3

°C 22 °C 21 °C 20 °C 2

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 x = Bit is unknown

CRIT

UPPER

T

A

LOWER

(1)

Bit:

CRIT

CRIT

(1)

UPPER

UPPER

(1)

LOWER

LOWER

Bit:

Bit:

bit 15 T

vs. T

A

0 =TA T
1 =TA T

bit 14 TA vs. T

0 =T

1 =TA T

bit 13 TA vs. T

0 =TA T
1 =TA T

bit 12 SIGN Bit:

0 =T
1 =T

bit 11-0 Ambient Temperature (T

0°C

A

 0°C

A

) Bits: (Note 2)

A

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

Where:

T

A

= Ambient Temperature (°C)

UpperByte = T

A

bit 15 to bit 8

LowerByte = TA bit 7 to bit 0

Temperature  0°C

Temperature  0°C

T

A

UpperByte 24LowerByte 2

4–



+



=

T

A

256 UpperByte 24LowerByte 2

4–



+



–=

i2c_start(); // send START command

i2c_write(AddressByte & 0xFE); //WRITE Command

//also, make sure bit 0 is cleared ‘0’

i2c_write(0x05); // Write T

A

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){ //T

A

T

CRIT

}

if ((UpperByte & 0x40) == 0x40){ //T

A

T

UPPER

}

if ((UpperByte & 0x20) == 0x20){ //T

A

T

LOWER

}

UpperByte = UpperByte & 0x1F; //Clear flag bits

if ((UpperByte & 0x10) == 0x10){ //T

A

 0°C

UpperByte = UpperByte & 0x0F; //Clear SIGN

Temperature = 256 - (UpperByte x 16 + LowerByte / 16);

}else //T

A

 0°C

Temperature = (UpperByte x 16 + LowerByte / 16);

//Temperature = Ambient Temperature (°C)

This example routine assumes the variables and I

2

C communication subroutines are predefined:

5.1.4.1 TA bits 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 2
by 4 bits (or multiply by 2
shifted values provides the temperature data in decimal
format, see Equation 5-1.

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.

4

), and the lower byte must be left-shifted

-4

). Adding the results of the

EQUATION 5-1: BYTES TO

TEMPERATURE
CONVERSION

FIGURE 5-6: Example Instruction Code.

 2013 Microchip Technology Inc. DS20005192A-page 23

MCP9844

SDA

A
C
K

0011

A

TA Pointer

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

A
C
K

0011

A

MSB Data

A
C
K

N
A
K

S P

2A1A0

12345678 12345678 12345678

Address Byte

LSB Data

R

MCP9844

MCP9844

MCP9844

Master

Master

W

SDA

SCL

101

00000

001 10010

100

Note: It is not necessary to

select the register
pointer if it was set from
the previous read/write.

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

SDA

A
C
K

0011

A

Manuf. ID Pointer

0000

A
C
K

S

2A1A0

12345678 12345678

SCL

0

Address Byte

A
C
K

0011

A

MSB Data

A
C
K

N
A
K

S P

2A1A0

12345678 12345678 12345678

Address Byte

LSB Data

R

MCP9844

MCP9844

MCP9844

Master

Master

W

SDA

SCL

110

00000

000 01010

100

Note: It is not necessary to

select the register
pointer if it was set from
the previous read/write.

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

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 x = Bit is unknown

‘0000 0110’b

bit 15-0 Device Manufacturer Identification Number

.

FIGURE 5-8: Timing Diagram for Reading the Manufacturer ID Register (See Section 4.0 “Serial

Communication”).

 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

R-0 R-0 R-0 R-0 R-0 R-1 R-1 R-0

bit 15 bit 8

R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-1

bit 7 bit 0

‘0000 0111’b AND ‘0000 1000’b

Device ID

Device Revision

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 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

DS20005192A-page 26  2013 Microchip Technology Inc.

MCP9844

5.1.7 RESOLUTION REGISTER

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).

Note: In order to prevent accidentally writing the

resolution register to a higher resolution
and exceeding the maximum temperature
conversion time of t
down command (using the CONFIG regis­ter) is required to change the resolution
register. The device must be in Shutdown
mode to change the resolution.

= 125 ms, a Shut-

CONV

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

—

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 x = Bit is unknown

bit 15 Unimplemented: Read as ‘0’
bit 14-2 Unimplemented: Read as ‘0’
bit 1-0 Resolution:

00 = LSb = 0.5°C (t
01 = LSb = 0.25°C (power up default, t
10 = LSb = 0.125°C (t
11 = LSb = 0.0625°C (t

= 30 ms typical)

CONV

= 130 ms typical)

CONV

= 260 ms typical)

CONV

= 65 ms typical)

CONV

 2013 Microchip Technology Inc. DS20005192A-page 27

MCP9844

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 I
until bit 8 is cleared ‘0’ to enable Continuous
Conversion mode, or until power is recycled.

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.

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 t
reasserts the event output.

5.2.2 TEMPERATURE HYSTERESIS
(T

A hysteresis of 0°C, 1.5°C, 3°C or 6°C can be selected
for the T
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 T
are described graphically in Figure 5-9.

UPPER

UPPER

HYST

, T

)

, T

LOWER

. It remains in this mode

SHDN

before the device

CONV

and T

LOWER

and T

CRIT

CRIT

boundary conditions

temperate

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.

Bit 7 and 6 of the CONFIG register can be used to lock
the T

UPPER

, T

LOWER

and T

registers. The bits

CRIT

prevent false triggers at the event output due to an
accidental rewrite to these registers.

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.

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

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 de-assert. It will remain de­asserted until the device enters Continuous Conver­sion mode and after the first temperature conversion is
completed, t
sion, T

must satisfy the T

A

. After the initial temperature conver-

CONV

UPPER

or T

LOWER

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 T
and T

limits. The output is de-asserted by setting

LOWER

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, t
rupt clear bit (Bit 5) is never set, then the event output will
re-assert after the first temperature conversion.

In addition, if T

A

Comparator mode and asserts until T
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 < T
output remains asserted (see Figure 5-9 for a graphical
description). Switching from Interrupt mode to Compara­tor 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.

drifts above or below T

A

>= T

, the event output is forced as

CRIT

- T

CRIT

HYST

UPPER

. If the inter-

CONV

< T

A

CRIT

- T

HYST

. Otherwise, the event

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 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

t

Resolution

CONV

(ms)

0.5°C 30 33

0.25°C

65 15

(Power-up default)

0.125°C 130 8

0.0625°C 260 4

.

Samples/sec

(typical)

 2013 Microchip Technology Inc. DS20005192A-page 29

T

UPPER

T

LOWER

Event Output

T

CRIT

T

A

T

UPPER

- T

HYST

(Active-Low)

Comparator

Interrupt

S/w Int. Clear

Critical Only

T

CRIT

- T

HYST

1

2

3

4

5

7

TABLE 5-9: TEMPERATURE EVENT OUTPUT CONDITIONS

Note Output Boundary Conditions

Comparator Interrupt Critical TA Bits

Output State (Active Low/High) 15 14 13

1T

A

 T

LOWER

High/Low Low/High High/Low 0 0 0

2T

A

 T

LOWER

- T

HYST

Low/High Low/High High/Low 0 0 1

3T

A

 T

UPPER

Low/High Low/High High/Low 0 1 0

4 T

A

 T

UPPER

- T

HYST

High/Low Low/High High/Low 0 0 0

5 T

A

 T

CRIT

Low/High Low/High Low/High 1 1 0

6 When T

A

 T

CRIT,

the event output is forced to Comparator Mode and bits 0 of CONFIG (Event

Output mode) is ignored until T

A

 T

CRIT

- T

HYST

. 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.

7T

A

 T

CRIT

- T

HYST

Low/High High/Low High/Low 0 1 0

T

LOWER

- T

HYST

T

LOWER

-T

HYST

T

UPPER

- T

HYST

1

3

4

2

Note:

6

Event Output

(Active-High)

Comparator

Interrupt

S/w Int. Clear

Critical Only

MCP9844

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 V
to the V

POR_TS

and V

thresholds, the device

POR_EE

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)

0x00 Capability 0x00EF Event output de-asserts in shutdown

0x01 CONFIG 0x0000 Comparator mode

0x02 T

0x03 T

0x04 T

0x05 T

0x06 Manufacturer ID 0x0054 —

0x07 Reserved 0x0601 —

0x08 Microchip

0x09 Resolution 0x0001 Most Significant bit is set by default

Register Name

Device ID/ Device Revision

glitches down

DD

UPPER

LOWER

CRIT

A

Default Register

Data (Hexadecimal)

2

I

0.25°C Measurement Resolution

Measures temperature below 0°C

±1°C accuracy over active range

0x0000 0°C

0x0000 0°C

0x0000 0°C

0x0000 0°C

0x0601 —

0.25°C Measurement Resolution

Power-up Default

Register Description

C time out 25 ms to 35 ms.

Accepts V

at A0 Pin

HV

Temperature event output

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

 2013 Microchip Technology Inc. DS20005192A-page 31

MCP9844

NOTES:

DS20005192A-page 32  2013 Microchip Technology Inc.

MCP9844

T





JAVDDIDDVOL_EventIOL_EventVOL_SDAIOL_SDA



+



+



=

Where:

T=T

J - TA

TJ= Junction Temperature

TA= Ambient Temperature



JA

= Package Thermal Resistance

V

OL_Event, SDA

= Event and SDA Output V

OL

(0.4 V

max

)

I

OL_Event, SDA

= Event and SDA Output I

OL

(3 mA

max

and 20 mA

max,

respectively)

A0

A1

A2

GND

V

DD

Event

SCL

SDA

EP9

6.0 APPLICATIONS INFORMATION

6.1 Layout Considerations

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 V
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.

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.

and GND pins. A high-frequency

DD

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.

For example, if the event output is loaded to maximum

, Equation 6-1 can be used to determine the effect

I

OL

of self-heating.

EQUATION 6-1: EFFECT OF SELF-

HEATING

FIGURE 6-1: TDFN Package Layout.

 2013 Microchip Technology Inc. DS20005192A-page 33

At room temperature (TA = +25°C) with maximum
I

= 500 µA and VDD = 3.6V, the self-heating due to

DD

power dissipation T

is 0.58°C for the TDFN-8



package.

MCP9844

NOTES:

DS20005192A-page 34  2013 Microchip Technology Inc.

7.0 PACKAGING INFORMATION

Legend: XX...X Customer-specific information

Y Year code (last digit of calendar year)
YY Year code (last 2 digits of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code
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.

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.

3

e

3

e

8-Lead TDFN (2x3) (MCP9844)

Example:

Part Number Code

MCP9844T-BE/MNY ABS

ABS

310

25

7.1 Package Marking Information

MCP9844

 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.

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

MCP9844

 2013 Microchip Technology Inc. DS20005192A-page 37

MCP9844

 !""#$%&'

( !"#$%&"'""($)%

*++&&&!!+$

DS20005192A-page 38  2013 Microchip Technology Inc.

APPENDIX A: REVISION HISTORY

Revision A (March 2012)

• Original Release of this Document.

MCP9844

 2013 Microchip Technology Inc. DS20005192A-page 39

MCP9844

NOTES:

DS20005192A-page 40  2013 Microchip Technology Inc.

PRODUCT IDENTIFICATION SYSTEM

Device: MCP9844T: Single Op Amp (Tape and Reel)

Temperature Range: E = -40°C to +125°C (Extended)

Package: MNY* = Plastic Dual Flat, No Lead, (2x3 TDFN),

8-lead (TDFN)

* Y = Nickel palladium gold manufacturing designator. Only
available on the TDFN package.

PART NO. /XX

PackageTemperature

Range

Device

Examples:

a) MCP9844T-BE/MNY: Tape and Reel,

Extended Temp.,
8LD 2x3 TDFN pkg.

-X

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

MCP9844

 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:

YSTEM

CERTIFIED BY DNV

== ISO/TS 16949 ==

• 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

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conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

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The Microchip name and logo, the Microchip logo, dsPIC,
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and UNI/O are registered trademarks of Microchip Technology
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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
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Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
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and Z-Scale are trademarks of Microchip Technology
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SQTP is a service mark of Microchip Technology Incorporated
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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

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

32

logo, rfPIC, SST, SST Logo, SuperFlash

QUALITY MANAGEMENT S

 2013 Microchip Technology Inc. DS20005192A-page 43

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
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.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

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India - New Delhi

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Fax: [phone]

India - Pune

Tel: [phone]
Fax: [phone]

Japan - Osaka

Tel: [phone]
Fax: [phone]

Japan - Tokyo

Tel: [phone]
Fax: [phone]

Korea - Daegu

Tel: [phone]
Fax: [phone]

Korea - Seoul

Tel: [phone]
Fax: [phone] or
82-2-558-5934

Malaysia - Kuala Lumpur

Tel: [phone]
Fax: [phone]

Malaysia - Penang

Tel: [phone]
Fax: [phone]

Philippines - Manila

Tel: [phone]
Fax: [phone]

Singapore

Tel: [phone]
Fax: [phone]

Tai wan - Hsin Chu

Tel: [phone]
Fax: [phone]

Taiwan - Kaohsiung

Tel: [phone]
Fax: [phone]

Taiwan - Taipei

Tel: [phone]
Fax: [phone]

Thailand - Bangkok

Tel: [phone]
Fax: [phone]

EUROPE

Austria - Wels

Tel: [phone]
Fax: [phone]

Denmark - Copenhagen

Tel: [phone]
Fax: [phone]

France - Paris

Tel: [phone]
Fax: [phone]

Germany - Munich

Tel: [phone]
Fax: [phone]

Italy - Milan

Tel: [phone]
Fax: [phone]

Netherlands - Drunen

Tel: [phone]
Fax: [phone]

Spain - Madrid

Tel: [phone]
Fax: [phone]

UK - Wokingham

Tel: [phone]
Fax: [phone]

11/29/12

DS20005192A-page 44  2013 Microchip Technology Inc.