MCP47FXB2XT-EST datasheet(88/124 Pages) MICROCHIP

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MCP47FXBX4/8

DS20006368A-page 88

 2020 Microchip Technology Inc.

7.3

General Call Commands

The MCP47FXBX4/8 acknowledges the General Call

Address command (00h in the first byte). General Call

commands can be used to communicate to all devices

on the I2C bus (at the same time) that understand the

General Call command. The meaning of the general

call address is always specified in the second byte (see

Figure 7-8).

If the second byte has a ‘1’ in the LSb, the specification

intends this to indicate a “Hardware General Call”. The

MCP47FXBX4/8 will ignore this byte and all following

bytes (and A), until a Stop bit (P) is encountered.

The MCP47FXBX4/8 devices support the following I2C

General Call commands:

• General Call Reset (06h)

• General Call Wake-up (0Ah)

The General Call Reset command format is specified

by the I2C specification. The General Call Wake-Up

command is a Microchip-defined format. The General

Call Wake-Up command will have all devices wake up

(that is, exit the Power-Down mode).

The other two I2C specification command codes (04h

and 00h) are not supported. Therefore those com-

mands are Not Acknowledged.

If these 7-bit commands conflict with other I2C devices

on the bus, then the customer will need two I2C buses

and ensure that the devices are on the correct bus for

their desired application functionality.

FIGURE 7-8:

General Call Format.

Note:

Refer to the NXP specification #UM10204,

Rev. 03 19 June 2007 document for more

details on the General Call specifications.

The I2C specification does not allow

‘00000000’ (00h) in the second byte.

General Call address

“7-bit command”

I2C ACK bit(1)

I2C Start bit

GC command

I2C Stop bit(2,3)

Legend:

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

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

command can be repeated, or another General Call command can be sent. Only the first

command will be accepted by the MCP47FXBX4/8.

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