EMC1702 datasheet(50/60 Pages) MICROCHIP

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EMC1702

DS20006455A



2020 Microchip Technology Inc.

The Source Voltage registers store the voltage measured at the SENSE+ pin (see Section 4.1.2,

"Voltage Measurement") as a digital value, VSOURCE, consisting of a high byte and low byte with five

of its LSBs always zero.

The measured voltage is determined by summing the bit weights of each bit set. For example, if VBUS

was 7.4V, the Source Voltage registers would read 0100_1110 for the high byte and 1100_0000b for

the low byte corresponding to 6V + 0.75V + 0.375V + 0.1875V + 0.0469V + 0.0234V = 7.383V.

The bit weightings are assigned for human interpretation. They should be disregarded when translating

the information via a computing system as shown in Section 4.1.2, "Voltage Measurement".

The Source Voltage registers cannot support negative values, and all values less than 0V will be

recorded as 0V.

5.24 Power Ratio Registers

The Power Ratio registers store a power factor value that is used to determine the final average power

delivered to the system (see Section 4.1.3, "Power Calculation"). The power factor value is the result

of the multiplication of the VSENSE reading and the VSOURCE reading values shifted to a 16-bit number.

It represents the ratio of delivered power with respect to maximum power.

5.25 VSENSE Limit Registers

The VSENSE Limit registers store a high and low limit for VSENSE. VSENSE is compared against both

limits after each update.

The data format for the limit is a raw binary form that is relative to the maximum VSENSE that has been

programmed.

If the measured sense voltage meets or exceeds the high limit or drops below the low limit, the ALERT

pin is asserted and the VSENSE_HIGH or VSENSE_LOW status bits are set in the High Limit Status

or Low Limit Status registers (see Section 5.15 and Section 5.16).

APPLICATION NOTE: VSENSE is always checked to be greater than the high limit or less than the low limit including

when VSENSE is negative.

Table 5.39 Power Ratio Registers

ADDR

R/W

DEFAULT

5Bh

Power Ratio

High Byte

32768

16384

8192

4096

2048

1024

512

256

00h

5Ch

Power Ratio

Low Byte

128

00h

Table 5.40 VSENSE Limit Registers

ADDR

R/W

DEFAULT

60h

R/W

Sense Voltage

High Limit

Sign

1024

512

256

128

7Fh

61h

R/W

Sense Voltage

Low Limit

Sign

1024

512

256

128

80h

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