EMC1702 datasheet(24/60 Pages) MICROCHIP

24 / 60 page

EMC1702

DS20006455A



2020 Microchip Technology Inc.

Full Scale Power can be calculated from:

Actual power drawn from the source can be calculated using:

For example: Suppose that the actual source voltage is 10.65V and the source current through a 10m

resistor is 1.65A. The FSC value is 2A per Equation [1]; thus, the expected power is 17.573W which

is 36.6% of the FSP value.

Reading the Power Ratio Registers will report PRATIO as 24,003d (0101_1101_1100_0011b or

5D_C3h), which is 36.6% of the full scale source power. This results in a calculated source power of

17.6W.

4.1.4

Current Peak Detection

The EMC1702 includes a hardware set instantaneous current peak detector. The peak detector

threshold and duration values may also be set via the SMBus.

The peak detector supports detection of current spikes that occur faster than the minimum current

sensing conversion time. This allows quick reaction to events requiring system-level response. The

circuitry compares the measured current against a user-defined threshold value and user-defined time

duration. If the measured current exceeds the threshold, an internal timer is started. If the timer

reaches the programmed duration, the THERM pin is asserted (see Figure 4.2 for an example of peak

current detection) and the PEAK status bit set.

The THERM pin will remain asserted until the Peak is no longer detected at which point it will be

released. The PEAK status bit will likewise be cleared.

The Peak Detection circuitry may also assert the ALERT pin. In this case, the ALERT pin must be

configured to operate in Comparator mode. If the ALERT pin is configured to operate in Interrupt mode,

the Peak Detection circuitry will not cause the ALERT pin to be asserted.

The Peak Detection circuitry includes filtering (tFILTER). When the instantaneous current exceeds the

threshold, it must drop below the threshold for a period of time greater than tFILTER before the timer is

reset. The Peak Detection circuitry works for current flowing in either direction through the sense

resistor (RSENSE).

APPLICATION NOTE: The Peak Detector circuitry works independently of the current measurement integration.

where:

[5]

FSP is the Full-Scale Power

FSC is the Full-Scale Current (from

Equation [1])

FSV is the Full-Scale Voltage (from

Equation [3])

where:

[6]

PSOURCE is the actual power

provided by the source

measured at SENSE+

FSP is the Full-Scale Power

(from Equation [5])

PRATIO is the value read from

the Power Ratio Registers

(see Section 5.24)

FSP

FSC

FSV



PSOURCE FSP

PRATIO

65 535

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