MCP4728 datasheet(31/66 Pages) MICROCHIP

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DS22187C-page 31

MCP4728

5.4

I2C General Call Commands

The device acknowledges the general call address

command (0x00 in the first byte). The meaning of the

general call address is always specified in the second

byte. The I2C specification does not allow to use

“00000000” (00h) in the second byte. Please refer to

the Philips I2C document for more details of the

General Call specifications.

The MCP4728 device supports the following I2C

General Calls:

• General Call Reset

• General Call Wake-Up

• General Call Software Update

• General Call Read Address Bits

5.4.1

GENERAL CALL RESET

The

General Call Reset occurs if the second byte is

“00000110” (06h). At the acknowledgement of this

byte, the device will abort the current conversion and

perform the following tasks:

• Internal reset similar to a Power-On-Reset (POR).

The contents of the EEPROM are loaded into

each DAC input and output registers immediately.

•

VOUT will be available immediately regardless of

the LDAC pin condition.

FIGURE 5-3:

General Call Reset.

5.4.2

GENERAL CALL WAKE-UP

If the second byte is “00001001” (09h), the device will

reset the Power-Down bits (PD1,PD0 = 0,0).

FIGURE 5-4:

General Call Wake-Up.

1st Byte

Note 1

Stop

Start

2nd Byte

ACK (MCP4728)

(General Call Command)

(Command Type = General Call Reset)

Clock Pulse (CLK Line)

Data (SDA Line)

Note 1: At this falling edge of the last ACK clock bit:

a. Startup Timer starts a reset sequence and

b. EEPROM data is loaded into the DAC Input and Output Registers immediately.

1st Byte

Note 1

Stop

Start

2nd Byte

ACK (MCP4728)

(General Call Command)

(Command Type = General Call Wake-Up)

Clock Pulse (CLK Line)

Data (SDA Line)

Note 1: Resets Power-Down bits at this falling edge of the last ACK clock bit.

MCP4728 Datasheet(PDF) 31 Page - Microchip Technology

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