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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP9844 Datasheet

1.8V Digital Temperature Sensor

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MCP9844
±1°C Accurate, 1.8V Digital Temperature Sensor
Features
• 1MHz, 2-wire I2C™ Interface
• User Selectable Measurement Resolution:
- +0.5°C, +0.25°C, +0.125°C, +0.0625°C
• User Programmable Temperature Limits:
- Temperature Window Limit
- Critical Temperature Limit
• User Programmable Temperature Alert Output
• Specified VDD Range: 1.7V to 3.6V
• Operating Current: 100 µA (typical)
• Available Package: 8-Pin TDFN
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
Typical Applications
• Temperature sensing for Solid State Drive (SSD)
• General Purpose Temperature Datalog
• General Purpose
• Industrial Applications
• Industrial Freezers and Refrigerators
• Food Processing
• Personal Computers and Servers
• PC Peripherals
• Consumer Electronics
• Handheld/Portable Devices
3.0
VDD = 1.7 V to 3.6 V
2.0 16 units
Spec. Limits
1.0
0.0
-1.0
-2.0
+Std. Dev.
Average
-Std. Dev.
-3.0
-40 -20 0 20 40 60 80 100 120
TA (°C)
Description
Microchip Technology Inc.’s MCP9844 digital
temperature sensor converts temperature from -40°C
to +125°C to a digital word. 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.
The MCP9844 digital temperature sensor comes with
user programmable registers that provide flexibility for
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
MCP9844 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 the thermostat operation, or
as a temperature event interrupt output for
microprocessor-based systems.
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.
2013 Microchip Technology Inc.
DS20005192A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP9844 Datasheet

1.8V Digital Temperature Sensor

No Preview Available !

MCP9844
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD.................................................................................. 4.0V
Voltage at all Input/Output pins ............... GND – 0.3V to 4.0V
Pin A0....................................................... GND – 0.3V to 11V
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 (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, VDD = 1.7V to 3.6V, GND = Ground,
and TA = -40°C to +125°C.
Parameters
Sym Min Typ Max Unit
Conditions
Temperature Sensor Accuracy
+75°C < TA +95°C
+40°C < TA +125°C
-40°C < TA +125°C
Temperature Conversion Time
0.5°C/bit
0.25°C/bit
0.125°C/bit
0.0625°C/bit
TACY
tCONV
-1.0 ±0.2
-2.0 ±0.5
-3.0 ±1
— 30
— 65
— 130
— 260
+1.0
+2.0
+3.0
125
°C VDD = 1.8V
°C
°C
ms
ms 15 s/sec (typical) (See Section 5.2.4)
ms
ms
Power Supply
Specified Voltage Range
Operating Current
Shutdown Current
Power On Reset (POR)
Settling time after POR
Power Supply Rejection,
VDD = 1.7V, 2.5V, 3.3V
VDD 1.7 —
IDD_TS
— 100
ISHDN
— 0.2
VPOR_TS — 1.5
tPOR
——
°C — 0.2
— ±1
3.6 V
500 µA
1 µA TA = 85°C
— V Threshold for falling VDD voltage
1 ms For warm and cold power cycles
— °C VDD = 1.7V to 3.6V
— °C VDD_AC = VDD +150 mVPP AC
(0 to 1 MHz) and TA = +25°C,
Event Output (Open-Drain output, external pull-up resistor required), see Section 5.2.3
High-level Current (leakage)
Low-level Voltage
IOH — —
1 µA VOH = VDD
VOL — — 0.4 V IOL= 3 mA (Active-Low, Pull-up
Resistor)
Thermal Response, from +25°C (Air) to +125°C (oil bath)
TDFN-8
tRES
— 0.7
s Time to 63% (89°C)
DS20005192A-page 2
2013 Microchip Technology Inc.


Part Number MCP9844
Description 1.8V Digital Temperature Sensor
Maker Microchip Technology
Total Page 30 Pages
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