MCP39F511 datasheet(21/62 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005393B-page 21

MCP39F511

4.7

Notation for Register Types

The following notation has been adopted for describing

the various registers used in the MCP39F511:

4.8

Single-Wire Transmission Mode

In Single-Wire Transmission mode, at the end of each

computation cycle, the device automatically transmits a

frame of power data. This allows for single-wire com-

munication after the device has been configured.

The single-wire transmission frame consists of

20 bytes: three Header Bytes, one Checksum and

16 bytes of power data (including RMS current, RMS

voltage, Active Power, Reactive Power and Line

Frequency).

TABLE 4-12:

SHORT-HAND NOTATION

FOR REGISTER TYPES

Notation

Description

u64

Unsigned, 64-bit register

u32

Unsigned, 32-bit register

s32

Signed, 32-bit register

u16

Unsigned, 16-bit register

s16

Signed, 16-bit register

b32

32-bit register containing discrete

Boolean bit settings

TABLE 4-13:

SINGLE-WIRE

TRANSMISSION FRAME

(Note 2)

#Byte

HEADERBYTE (0xAB)

HEADERBYTE2 (0xCD)

HEADERBYTE3 (0xEF)

CURRENT RMS – Byte 0

CURRENT RMS – Byte 1

CURRENT RMS – Byte 2

CURRENT RMS – Byte 3

VOLTAGE RMS – Byte 0

VOLTAGE RMS – Byte 1

ACTIVE POWER – Byte 0

ACTIVE POWER – Byte 1

ACTIVE POWER – Byte 2

ACTIVE POWER – Byte 3

REACTIVE POWER – Byte 0

REACTIVE POWER – Byte 1

REACTIVE POWER – Byte 2

REACTIVE POWER – Byte 3

LINE FREQUENCY – Byte 0

LINE FREQUENCY – Byte 1

CHECKSUM

For custom single-wire transmission

packets, contact a Microchip sales office.

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