MCP9800 datasheet(13/30 Pages) MICROCHIP

13 / 30 page

 2004 Microchip Technology Inc.

DS21909B-page 13

MCP9800/1/2/3

4.3.4

SENSOR CONFIGURATION

The MCP9800/1/2/3 has an 8-bit read/write configura-

tion register (CONFIG) 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)

R/W-0

One-Shot

Resolution

Fault Queue

ALERT

Polarity

COMP/

INT

Shut-

down

bit 7

bit 0

bit 7

ONE-SHOT bit

= Enabled

= Disabled (Power-up default)

bit 5-6

Σ∆ ADC RESOLUTION bit

= 9 bit (Power-up default)

= 10 bit

= 11 bit

= 12 bit

bit 3-4

FAULT QUEUE bit

= 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)

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

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