MCP47CMB02 datasheet(83/124 Pages) MICROCHIP

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DS20006089B-page 83

MCP47CXBXX

7.7

General Call Commands

The MCP47CXBXX 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

MCP47CXBXX will ignore this byte and all following

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

The MCP47CXBXX 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, and therefore, those

commands are Not Acknowledged.

If these 7-bit commands conflict with other I2C devices

on the bus, the user will need two I2C buses to ensure

that the devices are on the correct bus for their desired

application functionality.

FIGURE 7-8:

General Call Formats.

Note:

Refer

the

“NXP

Specification”,

#UM10204, Rev. 03 19, June 2007 docu-

ment 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 MCP47CXBXX.

2: This command sequence does not need to terminate (using the Stop bit) and the general call com-

mand can be repeated or another general call command can be sent. Only the first command will

be accepted by the MCP47CXBXX.

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