MCP4728-E/UN Microchip Technology, MCP4728-E/UN Datasheet - Page 30

• Manufacturer Part Number: MCP4728-E/UN
• Description: IC DAC 12BIT W/I2C 10-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP4728-E/UN

• Number Of Converters: 4
• Settling Time: 6µs
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Number Of Bits: 12
• Data Interface: I²C
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Dac Outputs: 4
• Resolution: 12 bit
• Interface Type: I2C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Current: 110 mA
• Voltage Reference: 2.048 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP4728EV - BOARD EVAL 12BIT 4CH DAC MCP4728
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP4728
In this case, the slave (MCP4728) will leave the data
line HIGH to enable the master to generate the STOP
condition.
FIGURE 5-1:
5.3
The address byte is the first byte received following the
START condition from the master device. The first part
of the address byte consists of a 4-bit device code
which is set to 1100 for the MCP4728 device. The
device code is followed by three I
A1, A0) which are programmable by the users.
Although the three address bits are programmable at
the user’s application PCB, the user can also specify
the address bits during the product ordering process. If
there is no user’s request, the factory default setting of
the three address bits is “000” which is programmed
into the EEPROM. The three address bits allows eight
unique addresses.
FIGURE 5-2:
DS22187A-page 30
SDA
SCL
Note:
Device Code: Programmed (hard-wired) at the factory.
Address Bits: Reprogrammable into EEPROM by the user.
Start bit
(A)
MCP4728 Device Addressing
1
Device Code
CONDITION
Slave Address for MCP4728
1
START
Slave Address
(B)
0
Address Byte
Data Transfer Sequence On The Serial Bus.
Device Addressing.
Read/Write bit
0
Acknowledge bit
A2
Address Bits
2
C address bits (A2,
A1
ACKNOWLEDGE
ADDRESS OR
A0
R/W
VALID
(D)
ACK
TO CHANGE
ALLOWED
DATA
5.3.1
When the customer first receives any new MCP4728
device, its default address bit setting is “000”. The
customer can reprogram the I
EEPROM by using “Write Address Bit” command. This
write command needs current address bits. If the
address bits are unknown, the user can find them by
sending “General Call Read Address” Command. The
LDAC pin is also used to select the device of interest to
be programmed or to read the current address.
The following steps are needed for the I
programming.
(a) Read the address bits using “General Call Read
Address” Command. (This is the case when the
address is unknown.)
(b) Write I
Bits” Command.
The write address command will replace the current
address with a new address in both input registers and
EEPROM.
See Section 5.4.4 “General call Read Address Bits”
for the details of reading the address bits, and
Section 5.6.8 “Write Command: Write I2C Address
bits (C2=0, C1=1, C0=1)” for writing the address bits.
2
C address bits using “Write I
PROGRAMMING OF I
BITS
(D)
© 2009 Microchip Technology Inc.
2
C address bits into the
2
C ADDRESS
CONDITION
2
2
C Address
C address
STOP
(C)
(A)