MCP47FVB28T-MQ datasheet(79/124 Pages) MICROCHIP

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DS20006368A-page 79

MCP47FXBX4/8

7.0

I2C DEVICE COMMANDS

This section documents the commands supported by

the device.

The commands can be grouped into the following

categories:

• WRITE command (normal and high-voltage)

(C1:C0 = ‘00’)

• READ command (normal and high-voltage)

(C1:C0 = ‘11’)

• General Call commands

• Modify Device Configuration Bit command

(HVC = VIHH)

- Enable Configuration bit (C1:C0 = ‘10’)

- Disable Configuration bit (C1:C0 = ‘01’)

The supported commands are shown in Table 7-1. These

commands allow both single or continuous data

operation. Continuous data operation means that the I2C

master does not generate a Stop bit but repeats the

required data/clocks. This allows faster updates since the

overhead of the I2C control byte is removed. Table 7-1

also shows the required number of bit clocks for each

command’s different mode of operation.

7.0.1

ABORTING A TRANSMISSION

A Restart or Stop condition in an expected data bit

position will abort the current command sequence. If

the command was a write, that data word will not be

written to the MCP47FXBX4/8. Also, the I2C state

machine will be reset.

If the condition is a Restart (Start), then the following

byte will be expected to be the Slave Address byte.

If the condition is a Stop, the device will monitor for the

Start condition.

TABLE 7-1:

DEVICE COMMANDS – NUMBER OF CLOCKS

Command

# of Bit

Clocks (1)

Data Update Rate

(8-bit/10-bit/12-bit)

(Data Words/Second)

Comments

Operation

Code

Mode(6)

C1 C0

100 kHz

400 kHz

3.4 MHz (5)

Write Command (Normal

and High-Voltage)

Single

2,632

10,526

89,474

Continuous

27n + 11

3,559

14,235

120,996

For 10 data words

READ Command (Nor-

mal and High-Voltage) (2)

Random

2,083

8,333

70,833

Continuous

18n + 11

4,762

19,048

161,905

For 10 data words

Last Address

3,448

13,793

117,241

General Call Reset

Command

——

Single

5,000

20,000

170,000

Note 4

General Call Wake-up

Command

——

Single

5,000

20,000

170,000

Note 4

Enable Configuration Bit

(High-Voltage)

Command

Yes Single

5,000

20,000

170,000

Yes Continuous

9n + 11

9,901

39,604

336,634

For 10 data words

Disable Configuration Bit

(High-Voltage)

Command

Yes Single

5,000

20,000

170,000

Yes Continuous

9n + 11

9,901

39,604

336,634

For 10 data words

Note 1:

“n” indicates the number of times the command operation is to be repeated.

This command is useful to determine when an EEPROM programming cycle has completed.

This command can be either normal voltage or high voltage.

Determined by the General Call Command byte after the I2C General Call address.

There is a minimal overhead to enter into 3.4 MHz mode.

Nonvolatile registers can only use the Single mode.

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