MCP9805-BESLASHST datasheet(10/34 Pages) MICROCHIP

10 / 34 page

MCP9805

DS21977B-page 10

4.1.1

CAPABILITY REGISTER

This is a read-only register used to identify the temper-

ature sensor capability. In this case, the MCP9805 is

capable of providing temperature at 0.25°C resolution,

measuring

temperature

below

and

above

0°C,

providing ±1°C and ±2°C accuracy over the active and

monitor temperature ranges (respectively) and provid-

ing user-programmable temperature event boundary

trip limits. Register 4-2 describes

the Capability

in the following sections.

CAPABILITY REGISTER (READ-ONLY)

→ ADDRESS ‘0000 0000’b

bit 15-5

Unimplemented: Read as ‘0’

bit 4-3

RESOLUTION bits:

0.5 °C/LSb

0.25 °C/LSb (default resolution)

0.125 °C/LSb

0.0625 °C/LSb

bit 2

TEMPERATURE MEASUREMENT RANGE (Meas. Range) bit:

=TA = 0x0000 (Hexadecimal) for temperature below 0°C

= The part can measure temperature below 0°C

bit 1

ACCURACY bit:

=Accuracy

→ ±2°C from +75°C to +95°C (Active Range) and ±3°C from +40°C to +125°C

(Monitor Range)

=Accuracy

→ ±1°C from +75°C to +95°C (Active Range) and ±2°C from +40°C to +125°C

(Monitor Range)

bit 0

BASIC CAPABILITY (Temp. Event) bit:

= No defined function (This bit will never be cleared or set to ‘0’).

= The part has temperature boundary trip limits (TUPPER/TLOWER/TCRIT registers) and a temperautre

event output (JC 42.4 required feature).

Upper-Half:

U-0

——

—

bit 15

bit 8

Lower-Half:

U-0

R-0

R-1

—

Resolution

Meas.

Range

Accuracy

Temp.

Event

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

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