MCP39F511N datasheet(35/61 Pages) MICROCHIP

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 2015-2018 Microchip Technology Inc.

DS20005473B-page 35

MCP39F511N

6.6

Range Registers

The range registers are 32-bit registers that contain the

number of right-bit shifts for the following outputs,

divided into separate bytes defined below across the

two registers:

• RMS Voltage

• RMS Current, Channel 1

• Power, Channel 1

• RMS Current, Channel 2

• Power, Channel 2

Note that the Power Range byte operates across both

the active and reactive output registers and sets the

same scale.

The purpose of this register is two-fold: the number of

right-bit shifting (division by 2RANGE) must be:

• high enough to prevent overflow in the output

• low enough to allow for the desired output

resolution.

It is the user’s responsibility to set this register correctly

to ensure proper output operation for a given meter

design.

For further information and example usage, see

Section 9.3 “Single-Point Gain Calibrations at

Unity Power Factor”.

RANGE1 REGISTER

U-0

—

bit 31

bit 24

R/W-0

POWER1[7] POWER1[6] POWER1[5] POWER1[4] POWER1[3] POWER1[2] POWER1[1] POWER1[0]

bit 23

bit 16

R/W-0

CUR-

RENT1[7]

CUR-

RENT1[6]

CUR-

RENT1[5]

CUR-

RENT1[4]

CUR-

RENT1[3]

CUR-

RENT1[2]

CUR-

RENT1[1]

CUR-

RENT[0]

bit 15

bit 8

R/W-0

VOLTAGE[7] VOLTAGE[6] VOLTAGE[5] VOLTAGE[4] VOLTAGE[3] VOLTAGE[2] VOLTAGE[1] VOLTAGE[0]

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 31-24

Unimplemented: Read as ‘0‘

bit 23-16

POWER1[7:0]: Sets the number of right-bit shifts for the Active and Reactive Power output registers,

channel 1.

bit 15-8

CURRENT1[7:0]: Sets the number of right-bit shifts for the Current RMS output register, channel 1.

bit 7-0

VOLTAGE[7:0]: Sets the number of right-bit shifts for the Voltage RMS output register.

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