EMC2101-R-ACZL-TR datasheet(17/56 Pages) MICROCHIP

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DS20006703A-page 17

EMC2101

4.5.2

TEMPERATURE FILTER

The EMC2101 contains variable filtering options to

suppress thermally or electrically noisy signals on the

External Diode lines. This filter can be configured as

Level 1, Level 2 or Disabled (see Section 5.23 “Aver-

aging Filter Register”). The typical filter performance

is shown in Figure 4-5 and Figure 4-6.

FIGURE 4-5:

Temperature Filter Step

Response.

FIGURE 4-6:

Temperature Filter Impulse

Response.

4.5.3

BETA COMPENSATION

The EMC2101 is software configurable to monitor the

temperature of basic diodes (e.g. 2N3904), or CPU

thermal diodes. It automatically detects the type of

external diode (CPU diode, diode connected transistor,

or PN diode) and determines the optimal setting to

reduce temperature errors introduced by beta variation.

4.5.4

RESISTANCE ERROR

CORRECTION (REC)

Parasitic resistance in series with the external diodes

will limit the accuracy obtainable from temperature

measurement devices. The voltage developed across

this resistance by the switching diode currents cause

the temperature measurement to read higher than the

true temperature. Contributors to series resistance are

Printed Circuit Board (PCB) trace resistance, on die

(i.e. on the processor) metal resistance, bulk resistance

in the base and emitter of the temperature transistor.

Typically, the error caused by series resistance is

+0.7°C per ohm. Temperature errors caused by up to

100Ω of series resistance are automatically corrected.

4.5.5

PROGRAMMABLE IDEALITY

FACTOR

The EMC2101 is designed for an external diode with an

ideality factor of 1.008. When an external diode,

processor or discrete, has a different ideality factor, an

error is introduced in the temperature measurement

which must be corrected. This is typically done using

programmable offset registers but this correction is

only accurate at one temperature since an ideality

factor mismatch introduces an error that is a linear

function of temperature. To provide maximum flexibility

to the user, the EMC2101 provides a 6-bit register to

set the ideality factor for the external diode which

eliminates errors across all temperatures (see

Table 5-2.).

This feature is only required in rare circumstances. The

majority of errors introduced are corrected with the

Beta Compensation and Resistance Error Correction

circuitry.

TABLE 4-3:

EMC2101 INTERNAL TEMPERATURE DATA FORMAT

Temperature (°C)

Digital Output (Binary)

≤ -64

1100 0000

-55

1100 1001

-1

1111 1111

0000 0000

0000 0001

+25

0001 1001

+125

0111 1101

+126

0111 1110

≥ +127

0111 1111

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