MCP47FVB01 datasheet(60/92 Pages) MICROCHIP

60 / 92 page

MCP47FVBXX

DS20005405A-page 60

 2015 Microchip Technology Inc.

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 MCP47FVBXX devices to be reset

synchronously.

The device performs 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 Power-on Reset (POR).

The device default settings are loaded into the

DAC registers and 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 from it’s Power-Down state (forces the

PDxB:PDxA bits to ‘00’). This command allows multiple

MCP47FVBXX devices to wake-up synchronously.

The device performs General Call Wake-up if the

second 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

(PDxB:PDxA) are forced to ‘00’.

FIGURE 7-9:

General Call Reset Command.

FIGURE 7-10:

General Call Wake-Up Command.

Control Byte

General Call Reset Command

S0 A

1 1 0 A P

General Call Address

Write bit

Note 1:

The Acknowledge bit is generated by the MCP47FVBXX.

At the falling edge of the SCL pin for the General Call Wake-Up command ACK bit, the

MCP47FVBXX device is reset.

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.

Start bit

ACK bit (1)

ACK bit (1, 2)

Stop bit (3)

Control Byte

General Call Wake-Up Command

0 A

0 1 0 A P

General Call Address

Write bit

Note 1:

The Acknowledge bit is generated by the MCP47FVBXX.

At the falling edge of the SCL pin for the General Call Wake-Up command ACK bit, the volatile

power-down bits (PDxB:PDxA) are forced to ‘00’.

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.

Start bit

ACK bit (1, 2)

Stop bit (3)

ACK bit (1)

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