MCP39F511N datasheet(49/61 Pages) MICROCHIP

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DS20005473B-page 49

MCP39F511N

9.6

Calibrating the Line Frequency

The Line Frequency register contains a 16-bit number

with a value equivalent to the input-line frequency as it

is measured on the voltage channel.

The measurement of the line frequency is only valid

from 45 to 65 Hz.

9.6.1

USING THE AUTO-CALIBRATE

FREQUENCY COMMAND

By applying a stable reference voltage with a constant

line frequency that is equivalent to the value that

resides in the LineFrequencyRef register, the

Auto-Calibrate Frequency

command can then

be issued to the device.

After a successful calibration (response = ACK), a

Save Registers to Flash

command can then be

issued to save the calibration constants calculated by

the device.

The

following

set

when

the

Auto-Calibrate Frequency

command is issued:

• Gain Line Frequency

The formula used to calculate the new gain is shown in

Equation 9-1.

9.7

Retrieving Factory-Default

Calibration Values

After user calibration and a Save to Flash command

has been issued, it is possible to retrieve the

factory-default calibration values. This can be done by

writing 0xA5A5 to the Calibration Delimiter register,

issuing a Save to Flash, and then resetting the part.

This

procedure

will

retrieve

all

factory

default-calibration values and will remain in this state

until calibration has been performed again, and a Save

to Flash

command has been issued.

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