EMC1702 datasheet(29/60 Pages) MICROCHIP

29 / 60 page

EMC1702



2020 Microchip Technology Inc.

DS20006455A

APPLICATION NOTE: When monitoring a substrate transistor or CPU diode and beta compensation is enabled, the

Ideality Factor should not be adjusted. Beta Compensation automatically corrects for most

ideality errors.

4.6.4

Dynamic Averaging

The EMC1702 supports dynamic averaging. When enabled, this feature changes the conversion time

for all channels based on the selected conversion rate. This essentially increases the averaging factor

as shown in Table 4.3. The benefits of Dynamic Averaging are improved noise rejection due to the

longer integration time as well as less random variation on the temperature measurement.

4.7

Diode Connections

For the EMC1702, the external diode channel supports any of the diode connections shown in

Figure 4.3.

4.7.1

Diode Faults

The EMC1702 actively detects an open and short condition on each measurement channel. When a

diode fault is detected, the temperature data MSByte is forced to a value of 80h and the FAULT bit is

set in the Status Register.

Table 4.3 Dynamic Averaging Behavior

CONVERSION RATE

AVERAGING FACTOR (RELATIVE TO 11-BIT CONVERSION)

DYNAMIC AVERAGING

ENABLED

DYNAMIC AVERAGING

DISABLED

< 1 / sec

16x

2 / sec

4 / sec

8 / sec

Figure 4.3 Diode Connections

Local

Ground

to DP

Typical remote

substrate transistor

i.e. CPU substrate PNP

Typical remote

discrete PNP transistor

i.e. 2N3906

Typical remote

discrete NPN transistor

i.e. 2N3904

to DN

to DP

to DN

to DP

to DN

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