MCP47CMB02 datasheet(73/124 Pages) MICROCHIP

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DS20006089B-page 73

MCP47CXBXX

7.0

DEVICE COMMANDS

The I2C protocol does not specify how commands are

formatted, so this section specifies the MCP47CXBXX

device’s I2C command formats and operation.

The commands can be grouped into the following

categories:

• Write Commands (C1:C0 = 00)

• Read Commands (C1:C0 = 11)

• General Call Commands

The supported commands are shown in Table 7-1.

These commands allow both 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.

7.1

Write Commands

Write commands are used to transfer data to the

desired memory location (from the Host controller). The

modes are Single or Continuous. The Continuous

mode format allows the fastest data update rate for the

device’s memory locations.

See Section 7.5 “Write Command” for a full description

of the write commands.

7.2

Read Commands

Read commands are used to transfer data from the

desired memory location to the Host controller. The

read command format writes two bytes (Control byte

(R/W bit) = 0) and the read command byte (desired

memory address and the read command). Then, a

Restart condition is followed by a second control byte,

but this control byte indicates an I2C read operation

(R/W bit = 1). The Master will then supply 16 clocks so

the specified address data are transfered. See

Section 7.6 “Read Command” for full a description of

the read commands.

Note:

The 8-bit data devices use the same

format as 10-bit and 12-bit devices. This

allows code migration compatibility at the

cost of nine extra clock cycles per data

byte transferred.

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

100 kHz

400 kHz

3.4 MHz (3)

Write Command(4)

Single

2,632

10,526

89,474

Continuous

27n + 11

3,559

14,235

120,996

For ten data words

Read Command

Random

2,083

8,333

70,833

Continuous

18n + 11

4,762

19,048

161,905

For ten data words

Last Address

3,448

13,793

117,241

General Call Reset

Command

—

— Single

5,000

20,000

170,000

Note 2

General Call Wake-up

Command

—

— Single

5,000

20,000

170,000

Note 2

Note 1:

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

Determined by general call command byte after the I2C general call address.

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

This command can be at either normal or high voltage. A high-voltage command requires the HVC pin to be at

VIHH, for the entire command, until the completion of the MTP cycle.

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