MCP39F521 datasheet(34/52 Pages) MICROCHIP

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MCP39F521

DS20005442A-page 34

 2015 Microchip Technology Inc.

6.6

Range Register

The Range register (Register 6-4) is a 32-bit register

that contains the number of right-bit shifts for the

following outputs, divided into separate bytes as

defined below:

• RMS Current

•RMS Voltage

• Power (Active, Reactive, Apparent)

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 register, and

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 8.3, Single-Point Gain Calibrations at Unity

Power Factor

RANGE REGISTER

U-0

—

bit 31

bit 24

R/W-0

R/W-1

R/W-0

R/W-1

POWER<7:0>

bit 23

bit 16

R/W-0

R/W-1

R/W-0

CURRENT<7:0>

bit 15

bit 8

R/W-0

R/W-1

R/W-0

R/W-1

R/W-0

VOLTAGE<7:0>

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

POWER<7:0>:

Sets the number of right-bit shifts for the Active and Reactive Power output registers

bit 15-8

CURRENT<7:0>:

Sets the number of right-bit shifts for the Current RMS output register

bit 7-0

VOLTAGE<7:0>:

Sets the number of right-bit shifts for the Voltage RMS output register

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