Microchip Technology ADM00317 Data Sheet
MCP4706/4716/4726
DS22272C-page 52
© 2011-2012 Microchip Technology Inc.
6.3
Write All Memory
(C2:C0 = 011)
(C2:C0 = 011)
This Write command is used to update the volatile and
nonvolatile (EEPROM) DAC register value and
Configuration bits.
nonvolatile (EEPROM) DAC register value and
Configuration bits.
shows an example of this
Write command.
• V
OUT
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 (T
(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 (T
WC
) for
the values to be written. Another Write All Memory
command should not be issued until the EEPROM
write is complete.
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.
(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 is
completed. The state of the RDY/BSY bit
can be monitored by a Read command.
“high” after the EEPROM write is
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 V
OUT
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
X X X X
MCP4716 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00
X X
X X X X
MCP4706 D07 D06 D05 D04 D03 D02 D01 D00
X X X X
X X X X
SDA
SCL
A2 A1 A0
1
1
0
0
0
0
0
1
PD1 PD0
G
0
b15 b14 b13 b12 b11 b10 b09 b08
0
Ref.
Data bits (16 bits) (3rd + 4th bytes)
Start bit
ACK bit
(
3
)
Read/Write bit (Write)
Stop bit
S
A
R/W
A
A
Power-
bits
Down
bits
bits
ACK bit
(
3
)
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
D07:D00 = 8-bit data for MCP4706 device
1
VREF1
VREF0
Data bits (8 bits) (4th byte)
b07 b06 b05 b04 b03 b02 b01 b00
0
A
P
ACK bit
(
3
)
Voltage
Select
bits
Select
bits
Gain
bit
bit