MCP9805 반도체 회로 부품 판매점
Memory Module Digital Temperature Sensor
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 Microchip Technology |
www.DataSheet4U.com
MCP9805
Memory Module Digital Temperature Sensor
Features
• Meets JEDEC Standard JC42.4 for Mobile
Platform Memory Module Thermal Sensor
• Temperature-to-Digital Converter
• Accuracy with 0.25 °C/LSb Resolution:
- ±1°C (max.) from +75°C to +95°C
- ±2°C (max.) from +40°C to +125°C
- ±3°C (max.) from -20°C to +125°C
• Programmable Temperature Monitor Boundary
• Critical Temperature Output
• Operating Voltage Range: 3.0V to 3.6V
• 2-wire Interface: SMBus/Standard mode I2C™
Compatible
• Operating Current: 200 µA (typ.)
• Shutdown Current: 0.1 µA (typ.)
• Available Packages: 2x3 DFN-8, TSSOP-8
Typical Applications
• Dual In-line Memory Module (DIMM)
• Personal Computers (PCs) and Servers
• Hard Disk Drives and Other PC Peripherals
• General Purpose Temperature Sensor
Typical Application
Memory Module
Memory
SPD*
Temperature
Sensor
EEPROM
MCP9805
R
R
3.3 VDD_SPD SDA SCLK
* Serial Presence Detect
Event
Description
Microchip Technology Inc.’s MCP9805 digital tempera-
ture sensor converts temperatures between -40°C and
+125°C to a digital word. This sensor is designed to
meet the JEDEC standard JC42.4 for Mobile Platform
Memory Module Thermal Sensor. This device provides
an accuracy of ±1°C (max.) from a temperature range
of +75°C to +95°C (active range) and ±2°C (max.) from
+40°C to +125°C (monitor range) as defined in the
JEDEC standard.
The MCP9805 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 tempera-
ture event and critical output boundaries. When the
temperature changes beyond the specified boundary
limits, the MCP9805 outputs an Event signal. The user
has the option of setting the 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 Event output can also be configured as a
critical temperature output.
This sensor has a 2-wire industry-standard SMBus
and Standard mode I2C compatible (100 kHz bus
clock) serial interface protocol, allowing up to eight sen-
sors to be controlled in a single serial bus. These fea-
tures make the MCP9805 ideal for sophisticated
multi-zone temperature-monitoring applications.
Package Types
MCP9805
8-Pin DFN (2x3)
A0 1
A1 2
A2 3
8 VDD
7 Event
6 SCLK
GND 4
5 SDA
8-Pin TSSOP
A0 1
A1 2
A2 3
8 VDD
7 Event
6 SCLK
GND 4
5 SDA
© 2005 Microchip Technology Inc.
DS21977B-page 1
MCP9805
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD....................................................................... 6.0V
Voltage at all Input/Output pins .... GND – 0.3V to 5.5V
Storage temperature ..........................-65°C to +150°C
Ambient temp. with power applied .....-40°C to +125°C
Junction Temperature (TJ)................................ +150°C
ESD protection on all pins (HBM:MM)....... (4 kV:200V)
Latch-Up Current at each pin ........................ ±200 mA
www.DataSheet4U.com
†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.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground and TA = -20°C to +125°C.
Parameters
Sym Min Typ Max Unit
Conditions
Power Supply
Operating Voltage Range
Operating Current
Shutdown Current
Power-On Reset Threshold (POR)
Power Supply Rejection
VDD
IDD
ISHDN
VPOR
PSRDC
PSRAC
3.0
—
—
—
—
—
—
200
0.1
2.2
±0.3
±0.5
Temperature Sensor Accuracy
Accuracy with 0.25 °C/LSb Resolution:
+75°C to +95°C
+40°C to +125°C
-20°C to +125°C
TA = -40°C
Internal ΔΣ ADC
TACY
TACY
TACY
TACY
-1.0 ±0.5
-2.0 ±1.0
-3.0 ±2.0
— ±2
Conversion Time (10-bits + Sign):
0.25 °C/LSb
Event Output (Open-Drain)
tCONV
—
65
High-Level Current (leakage)
Low-Level Voltage
Thermal Response
IOH — —
VOL — —
Response Time (Note):
DFN
tRES — 0.7
TSSOP
tRES — 1.5
Note: Thermal response with 1x1 inch dual-sided copper clad.
3.6
500
2
—
—
—
+1.0
+2.0
+3.0
—
125
1
0.4
—
—
V
µA Continuous Operation
µA Shutdown Mode
V VDD Falling Edge
°C
°C VDD = 3.3V + 150 mVpp
(0 to 1 MHz), TA = +25°C
°C Active Temp. Range
°C Monitor Temp. Range
°C
°C
ms 17 samples/sec. (typ.)
µA VOH = 3.6V
V IOL= 3 mA
s Time to 63% of +22°C (Air)
s to +125°C (Oil Bath)
DS21977B-page 2
© 2005 Microchip Technology Inc.
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MCP9805 sensor
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