MCP9844 datasheet(27/44 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS20005192A-page 27

MCP9844

5.1.7

RESOLUTION REGISTER

This register allows the user to change the sensor

resolution

(see

Section 5.2.4

“Temperature

Resolution”

). The POR default resolution is 0.25°C.

The selected resolution is also reflected in the

Capability register (see Register 5-2).

Note:

In order to prevent accidentally writing the

resolution register to a higher resolution

and exceeding the maximum temperature

conversion time of tCONV = 125 ms, a Shut-

down command (using the CONFIG regis-

ter) is required to change the resolution

mode to change the resolution.

RESOLUTION REGISTER

 ‘0000 1001’b

R/W-0

U-0

—

bit 15

bit 8

U-0

R/W-0

R/W-1

Resolution

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

Unimplemented:

Read as ‘0’

bit 14-2

Unimplemented:

Read as ‘0’

bit 1-0

Resolution:

= LSb = 0.5°C (tCONV = 30 ms typical)

= LSb = 0.25°C (power up default, tCONV = 65 ms typical)

= LSb = 0.125°C (tCONV = 130 ms typical)

= LSb = 0.0625°C (tCONV = 260 ms typical)

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