EMC1702 datasheet(21/60 Pages) MICROCHIP

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EMC1702



2020 Microchip Technology Inc.

DS20006455A

Chapter 4 General Description

The EMC1702 is a combination high-side current sensing device with precision voltage and

temperature measurement capabilities. It measures the voltage developed across an external sense

resistor to represent the high-side current of a battery or voltage regulator. The EMC1702 also

measures the source voltage and uses these measured values to present a proportional power

calculation. The EMC1702 contains additional bi-directional peak detection circuitry to flag

instantaneous current spikes with programmable time duration and magnitude threshold. Finally, the

EMC1702 includes an external diode channel for temperature measurement as well as an internal

diode for ambient temperature measurements.

The EMC1702 current-sense measurement converts differential input voltage measured across an

external sense resistor to a proportional output voltage. This voltage is digitized using a variable

resolution (13-bit to 15-bit) Sigma-Delta ADC and transmitted via the SMBus or I2C protocol. The

current range allows for large variations in measured current with high accuracy and low voltage drop

across the resistor.

The supply voltage is also measured and stored. When combined with the sense resistor voltage

measurement the power provided from the source can be determined. Programmable limits on both

voltage and current levels are used to generate an interrupt.

The EMC1702 has two levels of monitoring. The first provides a maskable ALERT signal to the host

when the measured temperatures or voltages meet or exceed user programmable limits. This allows

the EMC1702 to be used as an independent thermal watchdog to warn the host of temperature hot

spots without direct control by the host. The second level of monitoring provides a non maskable

interrupt on the THERM pin if the measured values meet or exceed a second programmable limit.

The temperature measurement includes advanced features such as Resistance Error Correction

(REC), Beta Compensation (to support CPU diodes requiring the BJT/transistor model including 45nm

and 65nm processors) and automatic diode type detection. These features combine to provide a robust

solution for complex environmental monitoring applications.

A system diagram is shown in Figure 4.1.

Figure 4.1 EMC1702 System Diagram

EMC1702

Host

SMDATA

SMCLK

ALERT

2N3904 typ.

THERM

VDD

ADDR_SEL

TH_SEL

DUR_SEL

GND

VDD

* Can either be DC Supply voltage or a separate supply

DC Load

DC Supply

Sense Resistor

SENSE-

SENSE+

3.0V to 5.5V

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