MCP4716 datasheet(52/86 Pages) MICROCHIP

52 / 86 page

MCP4706/4716/4726

DS22272A-page 52

6.3

Write All Memory

(C2:C0 = ‘011’)

This write command is used to update the volatile and

nonvolatile (EEPROM) DAC Register value and

configuration bits. Figure 6-3 shows an example of this

write command.

•VOUT update: At the falling edge of the

Acknowledge pulse of the 4th byte.

• EEPROM update: At the falling edge of the

Acknowledge pulse of the 4th byte.

The DAC register and Power-down configuration bits

(volatile and EEPROM) are updated with the written

date at the completion of the ACK bit (falling edge of

SCL). The EEPROM memory requires time (TWC) for

the values to be written. Another Write All memory

command should not be issued until the EEPROM

write is complete.

Write commands which only update volatile memory

(C2:C0 = ‘00x’ or ‘010’) can be issued. Read

commands and the General Call commands may not

be issued.

FIGURE 6-3:

Write All Memory Command.

Note:

RDY/BSY bit toggles to “low” and back to

“high”

after

the

EEPROM

write

completed. The state of the RDY/BSY bit

can be monitored by a read command.

Device Addressing

Data bits (8 bits) (3rd byte)

Note 1: The device updates VOUT at the falling edge of the SCL at the end of this ACK pulse.

Note 1

2: The 2nd - 4th bytes can be repeated after the 4th byte by continued clocking before issuing Stop bit.

Command

3: ACK bit generated by MCP47X6.

Note 2

b15 b14 b13 b12 b11 b10 b09 b08 b07 b06 b05 b04 b03 b02 b01 b00

MCP4726

D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

MCP4716

D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

MCP4706

D07 D06 D05 D04 D03 D02 D01 D00

SDA

SCL

A2 A1 A0

PD1 PD0

0 b15 b14 b13 b12 b11 b10 b09 b08

Ref.

Data bits (16 bits) (3rd + 4th bytes)

Start bit

ACK bit (3)

Read/Write bit (Write)

Stop bit

R/W

Power

bits

Down

bits

ACK bit (3)

Legend:

X = don’t care

D11:D00 = 12-bit data for MCP4726 device

D09:D00 = 10-bit data for MCP4716 device

D07:D00 = 8-bit data for MCP4706 device

VREF1

VREF0

Data bits (8 bits) (4th byte)

b07 b06 b05 b04 b03 b02 b01 b00

ACK bit (3)

Voltage

Select

bits

Gain

bit

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