MCP9902 datasheet(33/50 Pages) MICROCHIP

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 2015-2016 Microchip Technology Inc.

DS20005382C-page 33

MCP9902/3/4

EXT(N) BETA CFG – BETA COMPENSATION CONFIGURATION REGISTER

(ADDRESSES 25H AND 26H)

U-0

RW-1

RW-0

—

ENBLx

BETAx<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

Unimplemented

: Read as ‘0’

Unimplemented

: Read as ‘0’

Unimplemented

: Read as ‘0’

Unimplemented

: Read as ‘0’

ENBLx

: Enables the Beta Compensation factor auto-detection function. X = 1 or 2, depending on the

device

= Auto-Beta detection for External Diode x is enabled

= Auto-Beta detection for External Diode x is disabled

2-0

BETAx<2:0>

: These bits always reflect the current beta configuration settings. If auto-detection

circuitry is enabled, these bits will be updated automatically and writing to these bits will have no

effect.

000

= 0.11

001

= 0.18

010

= 0.25

011

= 0.33

100

= 0.43

101

= 1.00

110

= 2.33

111

= disabled

EXT (N) IDEALITY FACTOR – EXTERNAL DIODE N IDEALITY FACTOR

U-0

RW-0

RW-1

RW-0

RW-1

RW-0

—

IDEAL(n)<5:0>

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

7-6

Unimplemented

: Read as ‘0’

5-0

IDEAL(n)<5:0>

: External Diode n Ideality factor, where n = 1 to 3 depending on device

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