MCP9902 datasheet(22/50 Pages) MICROCHIP

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MCP9902/3/4

DS20005382C-page 22

 2015-2016 Microchip Technology Inc.

5.7

Data Read Interlock

When any temperature channel high byte register is

read, the corresponding low byte is copied into an

internal ‘shadow’ register. The user is free to read the

low byte at any time and be guaranteed that it will

correspond to the previously read high byte.

Regardless if the low byte is read or not, reading from

the same high byte register again will automatically

refresh this stored low byte data.

INT TEMP HI BYTE: INTERNAL DIODE HIGH BYTE TEMPERATURE DATA

R-0

IHB<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

IHB<7:0>

: 2’s complement integer value of the internal diode temperature reading

INT TEMP LO BYTE: INTERNAL DIODE LOW BYTE TEMPERATURE DATA

R-0

U-0

ILB<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

ILB<2:0>

: Fractional portion of the Internal Diode Temperature to be added to the value at register

00h

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’

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