MCP9801A5-MSLASHMS datasheet(18/42 Pages) MICROCHIP

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MCP9800/1/2/3

DS21909C-page 18

 2010 Microchip Technology Inc.

5.3.2

SENSOR CONFIGURATION

The

MCP9800/1/2/3

has

8-bit

read/write

Configuration register that allows the user to select the

different features. These features include shutdown,

ALERT output select as comparator or interrupt output,

ALERT output polarity, fault queue cycle, temperature

measurement resolution and One-shot mode (single

conversion while in shutdown). These functions are

described in detail in the following sections.

CONFIGURATION REGISTER (CONFIG) – ADDRESS

<0000 0001>b

R/W-0

One-Shot

Resolution

Fault Queue

ALERT

Polarity

COMP/INT

Shutdown

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

ONE-SHOT

bit

= Enabled

= Disabled (Power-up default)

bit 5-6

 ADC RESOLUTION bits

= 9 bit or 0.5°C (Power-up default)

= 10 bit or 0.25°C

= 11 bit or 0.125°C

= 12 bit or 0.0625°C

bit 3-4

FAULT QUEUE

bits

= 1 (Power-up default)

bit 2

ALERT POLARITY

bit

= Active-high

= Active-low (Power-up default)

bit 1

COMP/INT

bit

= Interrupt mode

= Comparator mode (Power-up default)

bit 0

SHUTDOWN

bit

= Enable

= Disable (Power-up default)

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