MCP47FVB28T-MQ datasheet(89/124 Pages) MICROCHIP

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DS20006368A-page 89

MCP47FXBX4/8

7.3.1

GENERAL CALL RESET

The I2C General Call Reset command forces a reset

event. This is similar to the Power-on Reset, except

that the reset delay timer is not started. This command

allows multiple MCP47FXBX4/8 devices to be reset

synchronously.

The device performs a General Call Reset if the second

byte is ‘00000110’ (06h). At the acknowledgment of

this byte, the device will abort the current conversion

and perform the following tasks:

• Internal reset similar to a POR. The contents of

the EEPROM are loaded into the DAC registers

and the analog output is available immediately

(following the acknowledgment pulse).

•The VOUT will be available immediately, but after a

short time delay following the acknowledgment

pulse. The VOUT value is determined by the

EEPROM contents.

7.3.2

GENERAL CALL WAKE-UP

The I2C General Call Wake-up command forces the

device to exit its Power-Down state (forces the

PDnB:PDnA bits to ‘00’). This command allows multiple

MCP47FXBX4/8 devices to wake up synchronously.

The device performs General Call Wake-up if the sec-

ond byte (after the General Call Address) is

‘00001010’ (0Ah). At the acknowledgment of this byte,

the device will perform the following task: the device’s

volatile Power-Down bits (PDnB:PDnA) are forced to

‘00’. The nonvolatile (EEPROM) Power-Down bit

values are not affected by this command.

FIGURE 7-9:

General Call Reset Command.

FIGURE 7-10:

General Call Wake-Up Command.

Note 1: The Acknowledge bit is generated by the MCP47FXBX4/8.

2: At the falling edge of the SCL pin for the General Call Reset command ACK bit, the MCP47FXBX4/8

device is reset.

3: This command sequence does not need to terminate (using the Stop bit) and the General Call Reset

command can be repeated, or the General Call Wake-Up command can be sent. Only the first command

will be accepted by the MCP47FXBX4/8.

General Call address

“7-bit command”

I2C ACK bit(1)

I2C Start bit

Reset command

I2C Stop bit(2,3)

Legend:

Note 1: The Acknowledge bit is generated by the MCP47FXBX4/8.

2: At the rising edge of the last data bit for the General Call Wake-Up command, the volatile Power-Down

bits (PDnB:PDnA) are forced to ‘00’.

3: This command sequence does not need to terminate (using the Stop bit) and the General Call Wake-

Up command can be repeated, or the General Call Reset command can be sent.

General Call address

“7-bit command”

I2C ACK bit(1)

I2C Start bit

Wake-Up command

I2C Stop bit(3)

Legend:

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