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EMC2101-R-ACZL-TR bảng dữ liệu(HTML) 15 Page - Microchip Technology

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 2022 Microchip Technology Inc. and its subsidiaries
DS20006703A-page 15
EMC2101
4.5
Temperature Monitors
In general, thermal diode temperature measurements
are based on the change in forward bias voltage of a
diode when operated at two different currents. The
change in forward bias voltage is proportional to
absolute temperature (T), as shown in Equation 4-1.
EQUATION 4-1:
FIGURE 4-3:
Block Diagram of Temperature Monitoring Circuit.
Figure 4-3 shows a block diagram of the temperature
measurement circuit. As shown, the EMC2101
incorporates a delta-sigma analog to digital converter
that integrates the temperature diode voltage from
multiple bias currents.
V
BE
kT
q
----------1n
IHIGH
ILOW
--------------


=
Where:
k
=
Boltzmann’s constant
T
=
Absolute temperature in Kelvin
q
=
Electron charge
η
=
Diode ideality factor
ΔΣ



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