MCP4728 Microchip Technology Inc., MCP4728 Datasheet - Page 37

• Manufacturer Part Number: MCP4728
• Description: 12-bit, Quad Digital-to-analog Converter With Eeprom Memory
• Manufacturer: Microchip Technology Inc.

5.6.5
When the device receives this command, it updates the
DAC voltage reference selection bit (V
channel. The EEPROM data is not affected by this
command. The affected channel’s analog output is
updated after the acknowledge pulse of the last byte.
Figure 5-12
for Select V
5.6.6
When the device receives this command, it updates the
Power-Down selection bits (PD1, PD0) of each chan-
nel. The EEPROM data is not affected by this
command. The affected channel is updated after the
acknowledge pulse of the last byte.
an example of the write command for the Select
Power-Down bits.
5.6.7
When the device receives this command, it updates the
gain selection bits (G
data is not affected by this command. The analog out-
put is updated after the acknowledge pulse of the last
byte.
mand for select gain bits.
© 2009 Microchip Technology Inc.
Figure 5-14
REF
WRITE COMMAND: SELECT V
BIT (C2=1, C1=0, C0=0)
WRITE COMMAND: SELECT
POWER-DOWN BITS (C2=1, C1=0,
C0=1)
WRITE COMMAND: SELECT GAIN
BIT (C2=1, C1=1, C0=0)
shows an example of the write command
bits.
shows an example of the write com-
X
) of each channel. The EEPROM
Figure 5-13
REF
) of each
REF
shows
5.6.8
This command writes new I
A0) to the DAC input registers and EEPROM. When
the device receives this command, it overwrites the
current address bits with the new address bits.
This command is valid only when the LDAC pin makes
a transition from “High” to “Low” at the low time of the
last bit (8th clock) of the second byte, and stays “Low”
until the end of the 3rd byte. The update occurs after
“Stop” bit if the conditions are met. The LDAC pin is
used to select a device of interest to write. The highest
clock rate of this command is 400 kHz.
shows the details of the address write
5.6.9
If the R/W bit is set to a logic “High” in the I
communications command, the device enters a
reading mode and reads out the input registers and
EEPROM.
command.
Note 1: To write a new device address, it needs
Note 1: The device address bits are read by using
Figure 5-15
WRITE COMMAND: WRITE I
ADDRESS BITS (C2=0, C1=1, C0=1)
READ COMMAND
the current address of the device. The
current address bits can be read out by
sending General Call Read Address Bits
command. See 5.4.4 “General call Read
Address Bits” for more details of reading
the I
General
command.
2
C address bits.
Call
shows the details of the read
2
MCP4728
C address bits (A2, A1,
Read
DS22187A-page 37
command.
Address
Figure 5-11
2
2
C
C serial
Bits