MCP47FVB01 datasheet(52/92 Pages) MICROCHIP

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MCP47FVBXX

DS20005405A-page 52

 2015 Microchip Technology Inc.

7.1

Write Command

(Normal and High-Voltage)

Write

commands are used to transfer data to the

desired memory location (from the Host controller). The

Write

command can be issued to the Volatile memory

locations.

Write

commands can be structured as either Single or

Continuous. The continuous format allows the fastest

data update rate for the devices memory locations.

The format of the command is shown in Figure 7-1

(Single) and Figure 7-3 (Continuous). For example

ACK/NACK behavior see Figure 7-2.

A Write command to a volatile memory location

changes that location after a properly formatted Write

command and the A/A clock has been received.

7.1.1

SINGLE WRITE TO VOLATILE

MEMORY

For volatile memory locations, data is written to the

MCP47FVBXX after every data word transfer (during

the Acknowledge). If a Stop or Restart condition is

generated during a data transfer (before the A), the

data will not be written to the MCP47FVBXX. After the

A bit, the master can initiate the next sequence with a

Stop or Restart condition.

Refer to Figure 7-1 for the byte write sequence.

FIGURE 7-1:

Write Random Address Command.

Note 1:

During device communication, if the

Device Address/Command combination

is invalid or an unimplemented Device

Address

specified,

then

the

MCP47FVBXX will NACK that byte. To

reset the I2C state machine, the

I2C communication must detect a Start

bit.

Control Byte

WRITE Command

AD AD AD AD

A0 0

x A

I2C™ Slave Address

Memory Address Command

Write bit

Reserved

Write Data

DD DD

DD D AP

Write “Data” bits

D DDD

D D D

Start bit

ACK bit (1)

ACK bit (1, 2)

ACK bit (1)

ACK bit (1, 2)

Stop bit (2)

Note 1:

The Acknowledge bit is generated by the MCP47FVBXX.

At the falling edge of the SCL pin for the Write command ACK bit, the MCP47FVBXX device updates the

value of the specified device register.

This command sequence does not need to terminate (using the Stop bit), and the Write command can

be repeated (see continuous write format, Section 7.1.2 “Continuous Writes to Volatile Memory”).

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