EMC2101-R-ACZL-TR datasheet(31/56 Pages) MICROCHIP

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DS20006703A-page 31

EMC2101

5.13

Beta Compensation Register

This register is used to set the Beta Compensation

factor that is used for the External Diode channel.

When using a diode-connected transistor (such as the

2N3904) or CPUs that implement the thermal diode as

a two-terminal diode, the CPU compensation circuit

must be disabled by writing a value of 07h to this

BETA COMPENSATION REGISTER (ADDRESS 18h)

—

ENABLE

BETA[2:0]

bit 7

bit 0

Legend:

RC = Read-then-clear 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 7-4

Unimplemented: Read as ‘0’

bit 3

ENABLE: Enables the Beta Compensation Factor Autodetection Algorithm.

1 = (default) The Beta Compensation Factor Autodetection circuitry is enabled. At the beginning of

every conversion, the circuitry will determine the optimal Beta Compensation factor setting and use

the detected setting. The value of the BETA[2:0] bits will be ignored.

0 = The Beta Compensation Factor Autodetection circuitry is disabled. The External Diode will always

use the Beta Compensation factor set by the BETA[2:0] bits.

bit 2-0

BETA: Selects the Beta Compensation factor that the External Diode will use if the autodetection cir-

cuitry is disabled. Table 5-3 shows the setting that should be used based on the expected beta value

of the substrate transistor connected to the External Diode channel.

Care should be taken when setting the BETA[2:0] bits. If the Beta Compensation factor is set at a beta

value that is higher than the transistor beta, then the circuit may introduce measurement errors.

TABLE 5-3:

CPU BETA VALUES

Enable

Minimum Beta

0.11

0.18

0.25

0.33

0.43

1.00

2.33

Disabled

Automatic detection

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