Memory Module Temperature Sensor w/EEPROM for SPD

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© 2009 Microchip Technology Inc.

DS22153C-page 1

MCP9843/98243

Features

• Meets JEDEC Specification 

- MCP9843 - JC42.4-TSE3000B3 

Temperature Sensor

- MCP98243 --> JC42.4-TSE2002B3 

Temperature Sensor with 2 Kbit Serial 
EEPROM for Serial Presence Detect (SPD)

• 2-wire I

2

C™/SMBus Interface

• Available Packages:

- DFN-8, TDFN-8, UDFN-8, TSSOP-8

Temperature Sensor Features

• Temperature-to-Digital Converter
• 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.) 

 -20°C to +125°C

• Specified V

DD

 Range: 3.0V to 3.6V

• Operating Current: 200 µA (typical)
• Operating  V

DD

 Range: 2.7V to 5.5V

Serial EEPROM Features (MCP98243)

• Specified V

DD

 Range: 1.8V to 5.5V

• Operating Current: 

- Write 

→ 1.1 mA (typical) for 3.5 ms (typical)

- Read 

→ 100 µA (typical)

• Permanent and Reversible Software Write Protect
• Software Write Protection for the lower 1 Kbit
• Organized as 1 block of 256 x 8-bit (2 Kbit)

Typical Applications

• DIMM Modules for Servers, PCs, and Laptops
• General Purpose Temperature Datalog

Description

Microchip Technology Inc.’s MCP9843/98243 digital
temperature sensors convert temperature from -40°C
and +125°C to a digital word. These sensors meet
JEDEC Specification JC42.4-TSE3000B3 and
JC42.4-TSE2002B3 Memory Module Thermal Sensor
Component. It provides an accuracy of ±0.2°C/±1°C
(typical/maximum) from +75°C to +95°C. In addition,
MCP98243 has an internal 256 Byte EEPROM which
can be used to store memory module and vendor
information.
The MCP9843/98243 digital temperature sensor
comes with user-programmable registers that provide
flexibility for DIMM 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 MCP9843/98243 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 thermostat operation, or as a temperature Event
interrupt output for microprocessor-based systems. 
The MCP98243 EEPROM is designed specifically for
DRAM DIMMs (Dual In-line Memory Modules) Serial
Presence Detect (SPD). The lower 128 Bytes (address
0x00 to 0x7F) can be Permanent Write Protected
(PWP) or Software Reversible Write Protected (SWP).
This allows DRAM vendor and product information to
be stored and write protected. The upper 128 bytes
(address 0x80 to 0xFF) can be used for general
purpose data storage. These addresses are not write
protected.
This sensor has an industry standard 2-wire,
I

2

C compatible serial interface, allowing up to eight

devices to be controlled in a single serial bus.

Package Types

DIMM MODULE

MCP9843/98243

8-Pin 2x3 DFN/TDFN/UDFN *

SDA

GND

Event

SCL

1

2

3

4

8-Pin TSSOP

A0

V

DD

A1
A2

8

7

6

5

* Includes Exposed Thermal Pad (EP); see 

Table 3-1

.

SCL

Event

SDA

A1

A2

1

2

3
4

8

7

6
5

GND

A0

V

DD

EP

9

Memory Module Temperature Sensor w/ EEPROM for SPD

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MCP9843/98243

DS22153C-page 2

© 2009 Microchip Technology Inc.

Sensor Typical Accuracy Performance

Note:

This accuracy data from the production system represents the typical accuracy performance of the
MCP98242 Memory Module Temperature Sensor. The MCP98242 production methodology is also used for
the MCP9843/98243 to achieve the same typical accuracy performance.

0%

10%

20%

30%

40%

50%

-1

.0

-0

.8

-0

.6

-0

.4

-0

.2

0.0

0.2

0.4

0.6

0.

8

1.0

Temperature Accuracy (°C)

O

ccu

rr

en

ces

T

A

 = +85°C

1,063,478 units
63 Production lots

Statistics:
Average = 0.003 °C
St. Dev = 0.13 °C
±3 Sigma = ±0.4 °C

MCP98243 VS. MCP98242

Feature

MCP98243

MCP98242

Event Output in Shutdown Mode

Event Output De-asserts

Event Output Remains in previous 

state. If the output asserts before 

shutdown command, it remains 

asserted during shutdown

I

2

C communication Timeout Range

t

OUT

 = 25 ms to 35 ms

t

OUT

 = 20 ms to 50 ms

I

2

C Maximum Bus Frequency

400 kHz

100 kHz

I

2

C SCL & SDA V

IL

/V

IH

 voltage levels

V

IL_MAX

=0.3*V

DD

, V

IH_MIN

=0.7*V

DD

V

IL_MAX

 = 0.8V, V

IH_MIN

 = 2.1V

V

HV A0

 range

7V to 12V

8V to 12V

I

2

C Spike Supression

50 ns

I

2

C input hysteresis

0.05V

DD

0.5V

Device/Revision ID Register

0x2101 (hex)

0x2001

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© 2009 Microchip Technology Inc.

DS22153C-page 3

MCP9843/98243

1.0

ELECTRICAL 
CHARACTERISTICS

Absolute Maximum Ratings †

V

DD

.................................................................................. 6.0V

Voltage at all Input/Output pins ............... GND – 0.3V to 6.0V
Pin A0 ................................................... GND – 0.3V to 12.5V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-40°C to +125°C
Junction Temperature (T

J

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

ESD protection on all pins (HBM:MM) ................. (4 kV:300V)
Latch-Up Current at each pin (25°C) ....................... ±200 mA

†Notice: Stresses above those listed under “Maximum
ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.

TEMPERATURE SENSOR DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

DD

 = 3.0V to 3.6V, GND = Ground, 

and T

A

 = -20°C to +125°C.

Parameters

Sym

Min

Typ

Max

Unit

Conditions

Temperature Sensor Accuracy

+75°C < T

A

 

≤ +95°C 

T

ACY

-1.0

±0.2

+1.0

°C

JC42.4 - TSE2002B3
Grade B Accuracy Specification

+40°C < T

A

 

≤ +125°C 

-2.0

±0.5

+2.0

°C

-20°C < T

A

 

≤ +125°C 

-3.0

±1

+3.0

°C

T

A

 

= -40°C

-1

°C

Temperature Conversion Time

0.25°C/bit

t

CONV

65

125

ms 15 s/sec (typical) (See Section 5.2.4)

Power Supply
Specified Voltage Range

V

DD

3.0

3.6

V

JC42.4 Specified Voltage Range

Operating Voltage Range

V

DD

2.7

5.5

V

Note 1

Operating Current

I

DD_TS

200

500

µA

EEPROM Inactive

Shutdown Current - MCP9843

 MCP98243

I

SHDN

1

2

µA

EEPROM Inactive, I

2

C Bus Inactive

1

3

µA

Power On Reset (POR)

V

POR_TS

2.2

V

Threshold for falling V

DD

 voltage

Power Supply Rejection,

T

A

 = +25°C

Δ°C/ΔV

DD

±0.3

°C/V V

DD

 = 2.7V to 5.5V

±0.15

°C

V

DD

 = 3.3V+150 mV

PP AC

 

(0 to 1 MHz)

Event Output (Open-Drain output, external pull-up or pull-down resistor required), see Section 5.2.3
High-level Current (leakage)

I

OH

1

µA

V

OH 

= V

DD

 (Active-Low, Pull-up 

Resistor)

Low-level Voltage

V

OL

0.4

V

I

OL

= 3 mA (Active-Low, Pull-up 

Resistor)

Low-level Current (leakage)

I

OL

1

µA

V

OL 

= V

SS

 (Active-High, Pull-down 

Resistor)

High-level Voltage

V

OH

V

DD

-0.5

V

I

OH

= 3 mA (Active-High, Pull-down 

Resistor)

Thermal Response, from +25°C (Air) to +125°C (oil bath)
DFN/UDFN/TDFN-8

t

RES

0.7

s

Time to 63% (89°C)

TSSOP-8

1.4

s

Note 1: Characterized but not production tested. Also, see Section 2.0 “Typical Performance Curves”.

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MCP9843/98243

DS22153C-page 4

© 2009 Microchip Technology Inc.

MCP98243 EEPROM DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

DD

 = 1.8V to 5.5V, GND = Ground, 

and T

A

 = -20°C to +125°C.

Parameters

Sym

Min

Typ

Max

Unit

Conditions

Power Supply
Operating Voltage Range

V

DD

1.8

5.5

V

Current, EEPROM write 

I

DD_EE

1100

2000

µA

Sensor in Shutdown Mode (for t

WC

), 

(Note 1)

Current, EEPROM read 

I

DD_EE

100

500

µA

Sensor in Shutdown Mode (Note 1)

Power On Reset (POR)

V

POR_EE

1.6

V

EEPROM

Write Cycle time (byte/page)

t

WC

3

5

ms

Endurance T

A

 = +25°C 

1M

cycles Number of Write Cycles, V

DD

 = 5V (Note 2)

EEPROM Write Temperature 

EE

WRITE

0

85

°C

EEPROM Read Temperature

EE

READ

-40

125

°C

For minimum read temperature, see Note 2

Write Protect Voltage
SWP and CWP Voltage

V

HV

7

12

V

Applied at A0 pin (Note 3)

PWP Voltage

V

DD

V

Note 1:

For V

DD

 ranges of 1.8V to the temperature sensor V

POR_TS

, the temperature sensor becomes partially biased and 

consumes 80 µA (typical) until the sensor POR resets and acknowledges a shutdown command. See 

Figure 2-15

.

2:

Characterized but not production tested. For endurance estimates in a specific application, please consult the Total 
Endurance™ Model which can be obtained from Microchip’s web site at www.microchip.com.

3:

The range of voltage applied at A0 pin for Permanent Write Protect is GND to V

DD

 + 1V. See 

Figure 2-13

 and 

Section 5.3.3 “Write Protection”.

INPUT/OUTPUT PIN DC CHARACTERISTICS (NOTE 1)

Electrical Specifications: Unless otherwise indicated, V

DD

 = 1.8V to 5.5V, GND = Ground and

T

A

 = -20°C to +125°C.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Serial Input/Output (SCL, SDA, A0, A1, A2) (Note 2)
Input

High-level Voltage

V

IH

0.7V

DD

V

Low-level Voltage

V

IL

0.3V

DD

V

Input Current

I

IN

±5

µA

SDA and SCL only

Input Impedance (A0, A1, A2)

Z

IN

1

M

Ω

V

IN

 > V

IH

Input Impedance (A0, A1, A2)

Z

IN

200

k

Ω

V

IN

 < V

IL

Output (SDA only)

Low-level Voltage

V

OL

0.4

V

I

OL

= 3 mA

High-level Current (leakage)

I

OH

1

µA

V

OH 

= V

DD

Low-level Current

I

OL

6

mA

V

OL

 = 0.6V

Capacitance

C

IN

5

pF

SDA and SCL Inputs
Hysteresis

V

HYST

0.05V

DD

V

V

DD

 > 2V

0.1V

DD

V

V

DD

 < 2V

Spike Supression

T

SP

50

ns

Note 1: These specifications apply for the Temperature Sensor and EEPROM.

2: For V

DD

 ranges of 1.8V to the temperature sensor V

POR_TS

, the temperature sensor becomes partially 

biased and consumes 80 µA (typical) until the sensor POR resets and acknowledges a shutdown 
command. See 

Figure 2-15

.

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DS22153C-page 5

MCP9843/98243

SENSOR AND EEPROM SERIAL INTERFACE TIMING SPECIFICATIONS

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

A

 = -20°C to +125°C, and C

L

 = 80 pF 

(Note 1, 5).

V

DD

= 1.8V to 5.5V V

DD

= 2.2V to 5.5V

Parameters

Sym

Min

Max

Min

Max

Units

Conditions

2-Wire I

2

C Interface

Serial port frequency

f

SCL

10

100

10

400

kHz

Note 2, 4

Low Clock

t

LOW

4700

1300

ns

Note 2

High Clock

t

HIGH

4000

600

ns

Note 2

Rise time 

t

R

1000

20

300

ns

Fall time 

t

F

20

300

20

300

ns

Data in Setup time

t

SU:DI

250

100

ns

Note 3

Data in Hold time

t

HD:DI

0

0

ns

Note 6

Data out Hold time

t

HD:DO

200

900

200

900

ns

Note 4

Start Condition Setup time 

t

SU:STA

4700

600

ns

Start Condition Hold time 

t

HD:STA

4000

600

ns

Stop Condition Setup time 

t

SU:STO

4000

600

ns

Bus idle

t

B:FREE

4700

1300

ns

Time out (Sensor Only)

t

OUT

25

35

ms

V

DD

= 3.0V to 3.6V

Bus Capacitive load

C

b

400

pf

Note 1: All values referred to V

IL MAX

 and V

IH MIN 

levels.

2: If t

LOW

 > t

OUT

 or t

HIGH

 > t

OUT

, the temperature sensor I

2

C interface will time out. A Repeat Start command 

is required for communication.

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

2

C-bus system, but the requirement t

SU:DAT

 

≥ 250 ns must 

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

R MAX

 + t

SU:DI MIN

 = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I

2

C-bus specification) 

before the SCL line is released.

4: As a transmitter, the device provides internal minimum delay time t

HD:DAT MIN

 to bridge the undefined 

region (min. 300 ns) of the falling edge of SCL t

F MAX

 to avoid unintended generation of Start or Stop 

conditions.

5: For V

DD

 ranges of 1.8V to the temperature sensor V

POR_TS

, the temperature sensor becomes partially 

biased and consumes 100 µA (typical) until the sensor POR resets and acknowledges a shutdown com-
mand.

6: As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition t

HD:DI

  0 ns  after 

SCL toggles Low. 

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MCP9843/98243

DS22153C-page 6

© 2009 Microchip Technology Inc.

TEMPERATURE CHARACTERISTICS

TIMING DIAGRAM

GRAPHICAL SYMBOL DESCRIPTION

Electrical Specifications: Unless otherwise indicated, V

DD

 = 1.8V to 5.5V for the EEPROM, V

DD

 = 3.0V to 3.6V for 

the Temperature Sensor, and GND = Ground.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Temperature Ranges
Specified Temperature Range

T

A

-20

+125

°C

Note 1

Operating Temperature Range

T

A

-40

+125

°C

Storage Temperature Range

T

A

-65

+150

°C

Thermal Package Resistances
Thermal Resistance, 8L-DFN

θ

JA

68

°C/W

Thermal Resistance, 8L-TDFN

θ

JA

52.5

°C/W

Thermal Resistance, 8L-TSSOP

θ

JA

139

°C/W

Thermal Resistance, 8L-UDFN

θ

JA

41

°C/W

Note 1: Operation in this range must not cause T

J

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

t

SU:

ST

O

t

SU

:D

I

t

SU:

DI

t

SU

:S

TO

t

B:

FR

EE

SC

L

SD

A

t

HD

:DI

 / 

t

HD:

DO

t

HIGH

t

LOW

t

OU

T

t

R

, t

F

Start Condition

Data Transmission

Stop Condition

V

DD

V

IH

V

IL

I

IN

Voltage

Current

time

V

DD

I

OH

Voltage

Current

time

INPUT

OUTPUT

V

OL

I

OL

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DS22153C-page 7

MCP9843/98243

2.0

TYPICAL PERFORMANCE CURVES

Note: Unless otherwise indicated, V

DD

 = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to V

DD

, and

T

A

 = -40°C to +125°C.

FIGURE 2-1:

Average Temperature 

Accuracy.

FIGURE 2-2:

Temperature Accuracy 

Histogram, T

A

 = +95°C.

FIGURE 2-3:

Temperature Accuracy 

Histogram, T

A

 = +75°C.

FIGURE 2-4:

Supply Current vs. 

Temperature.

 

FIGURE 2-5:

Serial Bus Time-Out vs. 

Temperature.

 

FIGURE 2-6:

Power-on Reset Threshold 

Voltage vs. Temperature.

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.

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

T

e

mp

erat

u

re

 A

ccu

racy

 (

°C

)

V

DD

= 3.3V

Spec. Limits

       
           

         

0%

10%

20%

30%

40%

50%

60%

70%

-1.

0

0

-0.

7

5

-0.

5

0

-0.

2

5

0.00

0.25

0.50

0.75

1.00

Temperature Accuracy (°C)

O

ccu

rrenc

es

T

A

 = +95°C

V

DD

 = 3.3V

221 units

0%

10%

20%

30%

40%

50%

60%

70%

-1.

0

0

-0.

7

5

-0.

5

0

-0.

2

5

0.0

0

0.2

5

0.5

0

0.7

5

1.0

0

Temperature Accuracy (°C)

O

ccu

rr

enc

es

T

A

 = +75°C

V

DD

 = 3.3V

221 units

1

10

100

1000

10000

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

I

DD

 (µ

A

)

EEPROM Write (Sensor in Shutdown Mode)

Sensor (EEPROM Inactive)

EEPROM Read (Sensor in Shutdown Mode)

25

30

35

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

t

OU

T

 (m

s)

V

DD

 = 3.3V to 3.6V

0

0.5

1

1.5

2

2.5

3

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

V

PO

R

 (V

)

V

POR_TS

V

POR_EE

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MCP9843/98243

DS22153C-page 8

© 2009 Microchip Technology Inc.

Note: Unless otherwise indicated, V

DD

 = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to V

DD

, and

T

A

 = -40°C to +125°C.

 

FIGURE 2-7:

Event and SDA V

OL

 vs. 

Temperature.

FIGURE 2-8:

Conversion Rate vs. 

Temperature.

  

FIGURE 2-9:

Power Supply Rejection vs. 

Frequency.

FIGURE 2-10:

SDA I

OL

 vs. Temperature.

  

FIGURE 2-11:

Temperature Accuracy vs. 

V

DD

.

FIGURE 2-12:

Package Thermal 

Response.

0

0.1

0.2

0.3

0.4

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

SD

A

 a

n

d

 Ev

en

t Ou

tp

u

(V

)

Event V

OL

SDA V

OL

I

OH

 = I

OL

 = 3 mA 

Event (V

DD

 - V

OH

)

       

           

         

35

50

65

80

95

110

125

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

t

CO

NV

 (m

s

)

-1.0

-0.5

0.0

0.5

1.0

100

1,000

10,000

100,000

1,000,000

Frequency (Hz)

N

o

rm

a

li

ze

d

 T

e

mp

E

rro

C

)

Δ°C/ΔV

DD

, V

DD

 = 3.3V + 150 mV

PP (AC)

1k

10k

100k

1M

100k

1M

10k

100k

1M

1k

10k

100k

1M

100

1k

10k

100k

1M

T

A

 = 25°C

No decoupling capacitor

6

12

18

24

30

36

42

48

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

S

DA I

OL

 (m

A)

V

OL

 = 0.6V

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-40

-20

0

20

40

60

80

100 120

T

A

 (°C)

T

em

p

er

at

u

re Ac

cu

ra

cy

 (

°C

)

Δ°C/ΔV

DD

 = 0.4°C/V

V

DD

= 2.7V

V

DD

= 3.0V

V

DD

= 3.6V

V

DD

= 5.5V

0%

20%

40%

60%

80%

100%

120%

-2

0

2

4

6

8

10

12

14

16

Time (s)

The

rm

al

 R

espo

n

se

 (%

)

22°C (Air) to 125°C (Oil bath)

TSSOP-8
DFN-8

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background image

© 2009 Microchip Technology Inc.

DS22153C-page 9

MCP9843/98243

Note: Unless otherwise indicated, V

DD

 = 2.7V to 5.5V, GND = Ground, SDA/SCL pulled-up to V

DD

, and

T

A

 = -40°C to +125°C.

 

FIGURE 2-13:

SWP/CWP/PWP High 

Voltage Range.

FIGURE 2-14:

Shutdown Current vs. 

Temperature.

FIGURE 2-15:

Shutdown Current vs. V

DD

.

0

2

4

6

8

10

12

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

V

DD

 (V)

V

HV

 (V

)

Maximum PWP Voltage (V

DD

 + 1V)

Minimum SWP/CWP Voltage

V

HV

 applied at A0 pin.

See 

Table 5-4

for Pins 

A1 and A2 connection

No
SWP/CWP/PWP
function within
this range

0.00

0.50

1.00

1.50

2.00

2.50

3.00

-40

-20

0

20

40

60

80

100 120

T

A

 (°C  )

I

SH

D

N

 (µ

A

)

0

20

40

60

80

100

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

V

DD

 (V)

I

S

HDN

 (µ

A)

V

POR_TS

, Sensor in Shutdown Mode

T

A

 = -40°C

T

A

 = +25°C

T

A

 = +85°C

T

A

 = +125°C

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background image

MCP9843/98243

DS22153C-page 10

© 2009 Microchip Technology Inc.

NOTES:

Maker
Microchip Technology Inc.
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