MCP47CMB02 datasheet(84/124 Pages) MICROCHIP

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MCP47CXBXX

DS20006089B-page 84

 2018-2019 Microchip Technology Inc.

7.7.1

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 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 perform the following tasks:

• Internal reset similar to a POR. The contents of

the MTP are loaded into the DAC registers

• Analog output (VOUT) is available after the POR

sequence has been completed.

7.7.2

GENERAL CALL WAKE-UP

The I2C General Call Wake-Up command forces the

device to exit from its Power-Down state (forces the

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

MCP47CXBXX 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.

Note 1:

The Acknowledge bit is generated by the MCP47CXBXX.

At the falling edge of the SCL pin for the General Call Reset command ACK bit, the

MCP47CXBXX device is reset.

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 MCP47CXBXX.

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 MCP47CXBXX.

2: At the rising edge of the last data bit for the general call wake-up command, the volatile

Power-Down bits (PDxB:PDxA) 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

Reset Command

I2C Stop Bit(3)

Legend:

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