MCP9844 datasheet(14/44 Pages) MICROCHIP

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MCP9844

DS20005192A-page 14

 2013 Microchip Technology Inc.

5.1.1

CAPABILITY REGISTER

This is a read-only register used to identify the

temperature sensor capability. For example, the

MCP9844 device 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 providing user programmable

temperature event boundary trip limits. Register 5-2

describes the Capability register. These functions are

described in further detail in the following sections.

CAPABILITY REGISTER (READ-ONLY)

 ADDRESS ‘0000 0000’b

U-0

——

—

bit 15

bit 8

R-1

R-0

R-1

SHDN Status

tOUT Range

—

Resolution

Meas Range

Accuracy

Temp Alarm

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 15-8

Unimplemented:

Read as ‘0’

bit 7

Event output status during Shutdown (SHDN Status):

Event output remains in previous state. If the output asserts before shutdown command, it

remains asserted during shutdown.

Event output de-asserts during shutdown. After shutdown, it takes tCONV to re-assert the event

output (power-up default)

bit 6

I2C Bus time-out (tOUT Range):

Bus time-out range is 10 ms to 60 ms

Bus time-out range is 25 ms to 35 ms (power-up default)

bit 5

Unimplemented:

Read as ‘1’

bit 4-3

Resolution:

= 0.5°C

= 0.25°C (power-up default)

= 0.125°C

= 0.0625°C

These bits reflect the selected resolution (see Section 5.2.4 “Temperature Resolution”)

bit 2

Temperature Measurement Range (Meas. Range):

=TA 0 (decimal) for temperature below 0°C

The part can measure temperature below 0°C (power-up default)

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