MCP47FVB21 datasheet(51/92 Pages) MICROCHIP

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DS20005405A-page 51

MCP47FVBXX

7.0

DEVICE COMMANDS

This section documents the commands that the device

supports.

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

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

commands allow for both a single data 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 and

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

written to the MCP47FVBXX. Also the I2C state

machine will be reset.

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

byte will be expected to be the Slave Address byte.

If the condition was 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

C1 C0

100kHz

400kHz

3.4MHz (4)

Write Command (Normal

and High-Voltage)(5)

(2)

Single

2,632

10,526

89,474

(2)

Continuous

27n + 11

3,559

14,235

120,996

For 10 data words

Read Command (Normal

and High-Voltage)(5)

(2)

Random

2,083

8,333

70,833

(2)

Continuous

18n + 11

4,762

19,048

161,905

For 10 data words

(2)

Last Address

3,448

13,793

117,241

General Call Reset

Command

——

(2)

Single

5,000

20,000

170,000

Note 3

General Call Wake-up

Command

——

(2)

Single

5,000

20,000

170,000

Note 3

Note 1:

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

This command can be either normal voltage or high voltage.

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

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

High-Voltage commands are supported for serial interface compatibility with the MCP47FEBXX devices.

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