MCP4726 datasheet(56/86 Pages) MICROCHIP

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MCP4706/4716/4726

DS22272A-page 56

6.6

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 “00000000”

(00h) in the second byte. Please refer to the Phillips I2C

document for more details on the General Call

specifications.

The MCP47X6 devices support the following I2C

general calls:

• General Call Reset

• General Call Wake-Up

6.6.1

GENERAL CALL RESET

The device performs General Call Reset 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 the

DAC registers and analog output is available

immediately.

• This is a similar event to the POR. The VOUT will

be available immediately, but after a short time

delay following the Acknowledgement pulse. The

VOUT value is determined by the EEPROM

contents.

This command allows multiple MCP47X6 devices to be

reset synchronously.

FIGURE 6-7:

General Call Reset Command.

General Call Address

Note 1: At the falling edge of the SCL at the end of this ACK pulse a reset occurs (startup timer starts and DAC register latched).

Note 1

2: The 2nd byte can be repeated after the 2nd by continued clocking before issuing Stop bit.

General Call Reset Command

3: ACK bit generated by MCP47X6.

Note 2

SDA

SCL

Start bit

ACK bit (3)

Read/Write bit (Write)

Stop bit

R/W

ACK bit (3)

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