MCP98243 Datasheet, PDF (1/62 Pages) Microchip Technology – Memory Module Temperature Sensor w/ EEPROM for SPD

MCP98243
Memory Module Temperature Sensor w/ EEPROM for SPD
Features
• Meets JEDEC Specification JC42.4-TSE2002B3
• Temperature Sensor + 2 Kbit Serial EEPROM
• 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 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
• 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
DIMM MODULE
MCP98243
Description
Microchip Technology Inc.’s MCP98243 digital
temperature sensor converts temperature from -40°C
and +125°C to a digital word. This sensor meets
JEDEC Specification JC42.4-TSE2002B3 Platform
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, this
device has an internal 256 Byte EEPROM which can
be used to store memory module and vendor
information.
The MCP98243 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 MCP98243 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 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 V_DD
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.
DS22153B-page 1