MCP4017 datasheet(36/66 Pages) MICROCHIP

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MCP4017/18/19

DS22147A-page 36

5.2.9

I2C COMMAND PROTOCOL

The MCP4017/18/19 is a slave I2C device which

supports 7-bit slave addressing. The slave address

contains seven fixed bits. Figure 5-9 shows the control

byte format.

5.2.9.1

Control Byte (Slave Address)

The Control Byte is always preceded by a START

condition. The Control Byte contains the slave address

consisting of seven fixed bits and the R/W bit. Figure 5-

9 shows the control byte format and Table 5-2 shows

the I2C address for the devices.

FIGURE 5-9:

Slave Address Bits in the

I2C Control Byte.

TABLE 5-2:

DEVICE I2C ADDRESS

5.2.9.2

Hardware Address Pins

The MCP4017/MCP4018/MCP4019 does not support

hardware address bits.

5.2.10

GENERAL CALL

The General Call is a method that the Master device

can communicate with all other Slave devices.

The MCP4017/18/19 devices do not respond to

General Call address and commands, and therefore

the communications are Not Acknowledged.

FIGURE 5-10:

General Call Formats.

SA6 A5A4A3A2 A1A0 R/W A/A

Start

bit

Slave Address

R/W bit

A bit (controlled by slave device)

R/W = 0 = write

R/W = 1 = read

A = 0 = Slave Device Acknowledges byte

A = 1 = Slave Device does not Acknowledge byte

“0” “1” “0” “1” “1” “1” “1”

Device

I2C Address

Comment

MCP4017

‘0101111’

MCP4018

‘0101111’

MCP4019

‘0101111’

00 0

000 0

xxxx

0 A P

General Call Address

Second Byte

“7-bit Command”

Reserved 7-bit Commands (By I2C Specification - Philips # 9398 393 40011, Ver. 2.1 January 2000)

‘0000 011’b - Reset and write programmable part of slave address by hardware.

‘0000 010’b - Write programmable part of slave address by hardware.

‘0000 000’b - NOT Allowed

The Following is a “Hardware General Call” Format

000

0000

xx1 A

General Call Address

Second Byte

“7-bit Command”

xxxx

xxX A P

n occurrences of (Data + A / A)

This indicates a “Hardware General Call”

MCP4016/7/8/9 will ignore this byte and

all following bytes (and A), until

a Stop bit (P) is encountered.

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