MCP39F521 datasheet(20/52 Pages) MICROCHIP

20 / 52 page

MCP39F521

DS20005442A-page 20

 2015 Microchip Technology Inc.

4.7

Command Descriptions

4.7.1

The Register Read, N bytes command returns

the N bytes that follow whatever the current address

pointer is set to. It should typically follow a

Set Address Pointer

command and can be used

in conjunction with other read commands. An

acknowledge, data and checksum is the response for

this command. The maximum number of bytes that can

be read with this command is 32. If there are other read

commands within a frame, the maximum number of

bytes that can be read is 32 minus the number of bytes

being read in the frame. With this command, the data is

returned LSB first.

4.7.2

The Register

Write,

bytes

command is

followed by N bytes that will be written to whatever the

current address pointer is set to. It should typically

follow a Set Address Pointer command and can

be used in conjunction with other write commands. An

acknowledge is the response for this command. The

maximum number of bytes that can be written with this

command is 32. If there are other write commands

within a frame, the maximum number of bytes that can

be written is 32 minus the number of bytes being

written in the frame. With this command, the data is

written LSB first.

4.7.3

SET ADDRESS POINTER (0x41)

This command is used to set the address pointer for all

read and write commands. This command is expecting

the address pointer as the command parameter in the

following two bytes, address high byte followed by

address low byte. The address pointer is two bytes in

length. If the address pointer is within the acceptable

addresses of the device, an acknowledge will be

returned.

4.7.4

SAVE REGISTERS TO FLASH (0x53)

The Save Registers To Flash command makes

a copy of all the calibration and configuration registers

to flash. This includes all R/W registers in the register

set. The response to this command is an acknowledge.

4.7.5

PAGE READ EEPROM (0x42)

The Read Page EEPROM command returns 16 bytes

of data that are stored in an individual page on the

MCP39F521. A more complete description of the

memory organization of the EEPROM can be found in

Section 9.0, EEPROM

. This command is expecting

the EEPROM page as the command parameter or the

following byte. The response to this command is an

acknowledge, 16-bytes of data and CRC checksum.

4.7.6

PAGE WRITE EEPROM (0x50)

The Page Write EEPROM command is expecting

17 additional bytes in the command parameters, which

are the EEPROM page plus 16 bytes of data. A more

complete description of the memory organization of the

EEPROM can be found in Section 9.0, EEPROM The

response to this command is an acknowledge.

4.7.7

BULK ERASE EEPROM (0x4F)

The Bulk Erase EEPROM command will erase the

entire EEPROM array and return it to a state of 0xFFFF

for each memory location of EEPROM. A more

complete description of the memory organization of the

EEPROM can be found in Section 9.0, EEPROM. The

response to this command is acknowledge.

4.7.8

AUTO-CALIBRATE GAIN (0x5A)

The Auto-Calibrate Gain command initiates the

single-point calibration that is all that is typically

required for the system. This command calibrates the

RMS current, RMS voltage and active power based on

the target values written in the corresponding registers.

See Section 8.0, MCP39F521 Calibration for more

information on device calibration. The response to this

command is acknowledge.

4.7.9

AUTO-CALIBRATE REACTIVE GAIN

(0X7A)

The Auto-Calibrate Reactive Gain command

initiates a single-point calibration to match the

measured reactive power to the target reactive power.

This is typically done at PF = 0.5. See section

Section 8.0,

MCP39F521

Calibration

for more

information on device calibration.

4.7.10

AUTO-CALIBRATE FREQUENCY

(0x76)

For applications not using an external crystal and

running the MCP39F521 off the internal oscillator, a

gain calibration to the line frequency indication is

required. The Gain Line Frequency (0x00AE) register

is set such that the frequency indication matches what

is set in the Line Frequency Reference (0x0094)

more information on device calibration.

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