MCP9805T-BESLASHST datasheet(8/34 Pages) MICROCHIP

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MCP9805

DS21977B-page 8

4.0

FUNCTIONAL DESCRIPTION

The MCP9805 temperature sensors consist of a band

gap

temperature

sensor,

Delta-Sigma

Analog-to-Digital

Converter

(

ΔΣ

ADC)

and

user-programmable

registers

using

2-wire

SMBus/Standard mode I2C compatible serial interface

protocol. Figure 4-1 shows a block diagram of the

FIGURE 4-1:

Clear Event Output Interrupt

Temperature Register (TA)

Temperature Upper-Boundary (TUPPER)

Temperature Lower-Boundary (TLOWER)

Configuration Register

ΔΣ ADC

Band Gap

Temperature

Sensor

Event Output Status

Enable/Disable Event Output

Critical Event Output only

Event Output Polarity, Active-High/Low

Critical Temperature Limit (TCRIT)

Device Capability Register

Measurement Resolution

Measurement Accuracy

Temperature Event Output

SMBus/Standard I2C™

Interface

Critical Boundary Trip Lock

Event Boundary Window Lock bit

Continuous Conversion or Shutdown

Event Output Hysteresis

Manufacturer Identification Register

Device Identification and Revision Register

Event Output Comparator/Interrupt

Measurement Range

VDD

GND

SDA

SCLK

Event

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