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PDF MCP98244 Data sheet ( Hoja de datos )
| Número de pieza | MCP98244 | |
| Descripción | DDR4 DIMM Temperature Sensor | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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MCP98244
DDR4 DIMM Temperature Sensor with EEPROM for SPD
Features
• Meets JEDEC Specification
- MCP98244 --> JC42.4-TSE2004B1
Temperature Sensor with 4 Kbit Serial
EEPROM for Serial Presence Detect (SPD)
• 1MHz, 2-wire I2C™ Interface
• Specified VDD Range: 1.7V to 3.6V
• Operating Current: 100 µA (typ., EEPROM Idle)
• Available Package: TDFN-8
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
Serial EEPROM Features
• Operating Current:
- Write 250 µA (typical) for 3 ms (typical)
- Read 100 µA (typical)
• Reversible Software Write Protect
• Software Write Protection for each 1 Kbit Block
• Organized as two banks of 256 x 8-bit (2 Kbit x 2)
Typical Applications
• DIMM Modules for Servers, PCs, and Laptops
• Temperature Sensing for Solid State Drive (SSD)
• General Purpose Temperature Datalog
DIMM MODULE
MCP98244
Description
Microchip Technology Inc.’s MCP98244 digital
temperature sensor converts temperature from -40°C
and +125°C to a digital word. This sensor meets
JEDEC Specification JC42.4-TSE3000B1 Memory
Module Thermal Sensor Component. 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. In addition, MCP98244 has an integrated
EEPROM with two banks of 256 by 8 bit EEPROM (4k
Bit) which can be used to store memory module details
and vendor information.
The MCP98244 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 MCP98244 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 MCP98244 EEPROM is designed specifically for
DRAM DIMMs (Dual In-line Memory Modules) Serial
Presence Detect (SPD). It has four 128 Byte pages,
which can be Software Write Protected individually.
This allows DRAM vendor and product information to
be stored and write-protected.
This sensor has an industry standard I2C Fast Mode
Plus compatible 1 MHz serial interface.
Package Types
8-Pin 2x3 TDFN*
A0 1
8 VDD
A1 2 EP 7 Event
A2 3 9 6 SCL
GND 4
5 SDA
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2012-2013 Microchip Technology Inc.
DS22327C-page 1
1 page  
MCP98244
SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, GND = Ground, TA = -40°C to +125°C, and CL = 80 pF
(Note 1).
VDD= 1.7V to 3.6V
100 kHz
VDD= 2.2V to 3.6V
400 kHz
1000 KHz
Parameters
Sym Min Max Min Max Min Max Units
2-Wire I2C Interface
Serial port frequency (Note 2, 4)
fSCL
10
100
10
400
10 1000 kHz
Low Clock (Note 2)
tLOW
4700
—
1300
—
500
— ns
High Clock
tHIGH
4000
—
600
—
260
— ns
Rise time (Note 5)
Fall time (Note 5)
Data in Setup time (Note 3)
Data in Hold time (Note 6)
tR
— 1000
20
300
—
120 ns
tF 20 300 20 300 — 120 ns
tSU:DAT
250
—
100
—
50
— ns
tHD:DI
0
—
0
—
0
— ns
Data out Hold time (Note 4)
tHD:DO
200
900
200
900
0
350 ns
Start Condition Setup time
tSU:STA 4700
—
600
—
260
— ns
Start Condition Hold time
tHD:STA 4000
—
600
—
260
— ns
Stop Condition Setup time
tSU:STO 4000
—
600
—
260
— ns
Bus Idle/Free
tB-FREE 4700
—
1300
—
500
— ns
Time out
tOUT
25
35
25
35
25
35 ms
Bus Capacitive load
Cb — —
— 400 — 100 pf
Note 1:
2:
All values referred to VIL MAX and VIH MIN levels.
If tLOW > tOUT, the temperature sensor I2C interface will time out. A Repeat Start command is required for
communication.
3: This device can be used in a Standard-mode I2C-bus system, but the requirement tSU:DAT 250 ns must
be met. This device does not stretch SCL Low period. It outputs the next data bit to the SDA line within
tR MAX + tSU:DAT MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I2C-bus specification)
before the SCL line is released.
4: As a transmitter, the device provides internal minimum delay time tHD:DAT MIN to bridge the undefined
region (min. 200 ns) of the falling edge of SCL tF MAX to avoid unintended generation of Start or Stop
conditions.
5: Characterized but not production tested.
6: As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD:DI 0 ns after
SCL toggles Low.
TIMING DIAGRAM
Start Condition
2012-2013 Microchip Technology Inc.
Data Transmission
Stop Condition
DS22327C-page 5
5 Page 
MCP98244
5.0 FUNCTIONAL DESCRIPTION
The MCP98244 temperature sensors consists of a
band-gap type temperature sensor, a Delta-Sigma
Analog-to-Digital Converter ( ADC), user-program-
mable registers and a 2-wire I2C protocol compatible
serial interface. Figure 5-1 shows a block diagram of
the register structure.
MCP98244 Temperature Sensor
Hysteresis
Shutdown
Critical Trip Lock
Alarm Win. Lock Bit
Clear Event
Event Status
Output Control
Critical Event only
Event Polarity
Event Comp/Int
Configuration
Temperature
TUPPER
TLOWER
TCRIT
Manufacturer ID
Device ID/Rev
Resolution
Capability
Shutdown Status
I2C Bus Time-out
Accepts VHV
Selected Resolution
Temp. Range
Accuracy
Register
Pointer
Output Feature
Band-Gap
Temperature
Sensor
ADC
0.5°C/bit
0.25°C/bit
0.125°C/bit
0.0625°C/bit
MCP98244 EEPROM
Memory
Control
Logic
XDEC
HV Generator
Software write
protected area
(00h-7Fh)
Software write
protected area
(7Fh-FFh)
Software write
protected area
(00h-7Fh)
Software write
protected area
(7Fh-FFh)
Write Protect
Circuitry
YDEC
SENSE AMP
R/W CONTROL
Standard I2C
Interface
A0 A1
FIGURE 5-1:
A2 Event
SDA
Functional Block Diagram.
SCL
VDD
GND
2012-2013 Microchip Technology Inc.
DS22327C-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP98244.PDF ] | |
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