MCP4728 datasheet(33/66 Pages) MICROCHIP

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DS22187C-page 33

MCP4728

5.4.4

GENERAL CALL READ ADDRESS

BITS

This command is used to read the I2C address bits of

the device. If the second byte is “00001100” (0Ch), the

device will output its address bits stored in EEPROM

and register. This command uses the LDAC pin to

select the device of interest to read on the I2C bus. The

LDAC pin needs a logic transition from “High” to “Low”

during the negative pulse of the 8th clock of the second

byte, and stays “Low” until the end of the 3rd byte. The

maximum clock rate for this command is 400 kHz.

FIGURE 5-6:

General Call Read I2C Address.

ACK

(MCP4728)

Restart

(General Call Address)

1st Byte

2nd Byte

Address Bits

in Input

Note 3

(Notes 1, 2, 3)

LDAC Pin

4th Byte

ACK (Master)

Start

3rd Byte

Note 3

ACK Clock

Clock Pulse

LDAC Pin

2nd Byte

3rd Byte

4th Byte

Note 2 (a)

ACK Clock

Note 2(b)

Stay “Low” until the end of the 3rd Byte

Note 2(b, c)

Restart Clock

(CLK Line)

Reading Address Bits

Stop

Note 1: Clock Pulse and LDAC Transition Details.

LDAC pin events at the 2nd and 3rd bytes.

Keep LDAC pin “High” until the end of the positive pulse of the 8th clock of the

2nd byte.

LDAC pin makes a transition from “High” to “Low” during the negative pulse of

the 8th clock of the 2nd byte (just before the rising edge of the 9th clock) and

stays “Low” until the rising edge of clock 9 of the 3rd byte.

The MCP4728 device does not acknowledge the 3rd byte if the conditions (a)

and (b) are not met.

3: LDAC pin resumes its normal function after “Stop” bit.

S 0 0 00000 0 A 000 01100 A Sr 1100 X X X 1 A A2 A1 A0 1 A2 A1 A0 0 A P

Restart Byte

EEPROM

Clock and LDAC Transition Details:

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