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PDF MCP9843 Data sheet ( Hoja de datos )
| Número de pieza | MCP9843 | |
| Descripción | Memory Module Temperature Sensor w/ EEPROM | |
| Fabricantes | Microchip Technology | |
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MCP9843/98243
Memory Module Temperature Sensor w/ EEPROM for SPD
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 I2C™/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 VDD Range: 3.0V to 3.6V
• Operating Current: 200 µA (typical)
• Operating VDD Range: 2.7V to 5.5V
Serial EEPROM Features (MCP98243)
• Specified VDD 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
DIMM MODULE
MCP9843/98243
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,
I2C compatible serial interface, allowing up to eight
devices to be controlled in a single serial bus.
Package Types
8-Pin 2x3 DFN/TDFN/UDFN * 8-Pin TSSOP
A0 1
8 VDD
A0 1
A1 2 EP 7 Event A1 2
A2 3 9 6 SCL
A2 3
GND 4
5 SDA GND 4
8 VDD
7 Event
6 SCL
5 SDA
* Includes Exposed Thermal Pad (EP); see Table 3-1.
© 2009 Microchip Technology Inc.
DS22153C-page 1
1 page  
MCP9843/98243
SENSOR AND EEPROM SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -20°C to +125°C, and CL = 80 pF
(Note 1, 5).
VDD= 1.8V to 5.5V VDD= 2.2V to 5.5V
Parameters
Sym Min Max Min Max Units
Conditions
2-Wire I2C Interface
Serial port frequency
fSCL 10 100 10 400 kHz Note 2, 4
Low Clock
tLOW
4700
—
1300
—
ns Note 2
High Clock
tHIGH
4000
—
600
—
ns Note 2
Rise time
tR
—
1000
20
300 ns
Fall time
tF 20 300 20 300 ns
Data in Setup time
tSU:DI
250
—
100
—
ns Note 3
Data in Hold time
tHD:DI
0
—
0
— ns Note 6
Data out Hold time
tHD:DO
200
900
200
900 ns Note 4
Start Condition Setup time tSU:STA 4700
—
600
—
ns
Start Condition Hold time tHD:STA 4000
—
600
—
ns
Stop Condition Setup time tSU:STO 4000
—
600
—
ns
Bus idle
tB:FREE 4700
—
1300
—
ns
Time out (Sensor Only)
tOUT
—
—
25 35 ms VDD= 3.0V to 3.6V
Bus Capacitive load
Cb — — — 400 pf
Note 1:
2:
All values referred to VIL MAX and VIH MIN levels.
If tLOW > tOUT or tHIGH > 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 time. It outputs the next data bit to the SDA line within
tR MAX + tSU:DI 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. 300 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop
conditions.
5: For VDD ranges of 1.8V to the temperature sensor VPOR_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 tHD:DI 0 ns after
SCL toggles Low.
© 2009 Microchip Technology Inc.
DS22153C-page 5
5 Page 
MCP9843/98243
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLES
MCP9843/98243
DFN, TDFN,
UDFN
1
TSSOP
1
Symbol
A0
22
A1
33
A2
44
GND
55
SDA
66
SCL
7 7 Event
88
9—
VDD
EP
Description
Slave Address and EEPROM Software Write Protect high voltage
input (VHV)
Slave Address
Slave Address
Ground
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)
These pins are device address input pins.
The address pins correspond to the Least Significant
bits (LSb) of address bits. The Most Significant bits
(MSb) (A6, A5, A4, A3). This is shown in Table 3-2.
TABLE 3-2:
MCP9843/98243 ADDRESS
BYTE
Device
Address Code
Slave
Address
A6 A5 A4 A3 A2 A1 A0
Sensor
0011
EEPROM
EEPROM
Write Protect
1 0 1 0XXX
0110
Note: User-selectable address is shown by X.
The A0 Address pin is a multi-function pin. This input
pin is also used for high voltge input VHV to enable the
EEPROM Software Write Protect feature, see
Section 5.3.3 “Write Protection”.
All address pin have an internal pull-down resistors.
3.2 Ground Pin (GND)
The GND pin is the system ground 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)
The MCP9843/98243 temperature Event output pin is
an open-drain output. The device outputs a signal
when the ambient temperature goes beyond the user-
programmed temperature limit. (see Section 5.2.3
“Event Output Configuration”).
3.6 Power Pin (VDD)
VDD is the power pin. The operating voltage range, as
specified in the DC electrical specification table, is
applied on this pin.
3.7 Exposed Thermal Pad (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the GND pin; they can
be connected to the same potential on the Printed Cir-
cuit Board (PCB). This provides better thermal conduc-
tion from the PCB to the die.
3.3 Serial Data Line (SDA)
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”).
© 2009 Microchip Technology Inc.
DS22153C-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP9843.PDF ] | |
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