MCP9902 datasheet(28/50 Pages) MICROCHIP

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MCP9902/3/4

DS20005382C-page 28

 2015-2016 Microchip Technology Inc.

EXT(N) LO LIM LB – EXTERNAL DIODE N LOW LIMIT, LOW BYTE

TEMPERATURE REGISTER (ADDRESSES 14H, 18H, 2FH)

R-0

EXT(N)_LLLB<2:0>

—

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 in unknown

7-5

EXT(N)_LLLB<2:0>

: Fractional portion of the Low Limit Temperature to be added to the value at the

respective high byte registers, where n = 1 to 3

111

= 0.875°C

110

= 0.750°C

101

= 0.625°C

100

= 0.500°C

011

= 0.375°C

010

= 0.250°C

001

= 0.125°C

000

= 0.000°C

4-0

Unimplemented

: Read as ‘0’

SCRTCHPD(N): SCRATCHPAD REGISTER (ADDRESSES 11H AND 12H)

RW-0

SPD(N)<7:0>

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 in unknown

7-0

SPD(N)<7:0>

: User temporary storage registers, where n = 1 to 2

ONE SHOT – ONE-SHOT TEMPERATURE CONVERSION INITIATION REGISTER

(ADDRESS 0FH)

RW-0

ONSH<7:0>

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 in unknown

7-0

ONSH<7:0>

: When the device is in the Standby state, writing to the One-shot Register will initiate a

conversion cycle and update the temperature measurements. Writing to the One Shot Register while

the device is in the Active state or when the BUSY bit is set in the Status Register 02h will have no

effect.

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