MCP9800A0T-M/OT Microchip Technology, MCP9800A0T-M/OT Datasheet - Page 13

• Manufacturer Part Number: MCP9800A0T-M/OT
• Description: IC SENSOR THERMAL 2.7V SOT235
• Manufacturer: Microchip Technology

Specifications of MCP9800A0T-M/OT

• Package / Case: SOT-23-5, SC-74A, SOT-25
• Output Type: I²C™/SMBus™
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: Programmable
• Full Temp Accuracy: 3 C
• Digital Output - Bus Interface: I2C, SMBus
• Digital Output - Number Of Bits: 9 bit to 12 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Description/function: High Accuracy 12-bit Serial Input/Output, Thermal Monitors
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 400 uA
• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 0.5°C
• Temperature Sensing Range: -55°C To +125°C
• Supply Voltage Range: 2.7V To 5.5V
• Resolution (bits): 12bit
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP9800DM-TS1 - DEMO BOARD TEMP SENSOR MCP9800
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MCP9800A0T-M/OTTR

5.0
The MCP9800/1/2/3 temperature sensor consists of a
band-gap type temperature sensor, a  Analog-to-
Digital Converter (ADC), user-programmable registers
and a 2-wire I
FIGURE 5-1:
 2010 Microchip Technology Inc.
Register
Pointer
FUNCTIONAL DESCRIPTION
Configuration
Temperature
2
Register
Register
Register
Register
C protocol-compatible serial interface.
T
T
HYST
SET
Alert Comp/Int
Fault Queue
Alert Polarity
Resolution
Functional Block Diagram.
Shutdown
One-Shot
Interface
I
2
C™
Temperature
Band-Gap
0.0625°C
 ADC
0.125°C
Sensor
0.25°C
0.5°C
5.1
The MCP9800/1/2/3 uses the difference in the base-
emitter voltage of a transistor while its collector current
is changed from IC
depends only on the ratio of the two currents and the
ambient temperature, as shown in
EQUATION 5-1:
5.2
A Sigma-Delta ADC is used to convert V
word that corresponds to the transistor temperature.
The converter has an adjustable resolution from 0.5°C
(at 30 ms conversion time) to 0.0625°C (at 240 ms
conversion time). Thus, it allows the user to make
trade-offs between resolution and conversion time.
Refer
Register (CONFIG)”
Resolution”
Where:
IC
1
and IC
to
Temperature Sensor
 Analog-to-Digital Converter
V
Section 5.3.2 “Sensor

BE
for details.
T = temperature in kelvin
q = electron charge
k = Boltzmann's constant
2
V
MCP9800/1/2/3
BE
= change in diode base-emitter
= currents with n:1 ratio
1
=
voltage
to IC


and
kT
----- -
q
2


. With this method, the V

Section 5.3.4.7 “ ADC
ln IC

1
Equation

DS21909D-page 13
IC
2
Configuration

BE
5-1.
to a digital
BE