MCP4725A0T-E/CH Microchip Technology, MCP4725A0T-E/CH Datasheet - Page 27

• Manufacturer Part Number: MCP4725A0T-E/CH
• Description: IC DAC 12BIT W/I2C SOT23A-6
• Manufacturer: Microchip Technology

Specifications of MCP4725A0T-E/CH

• Number Of Converters: 1
• Package / Case: SOT-23-6
• Settling Time: 6µs
• Number Of Bits: 12
• Data Interface: I²C, Serial
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Resolution: 12 bit
• Interface Type: Serial (2-Wire, 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP4725DM-PTPLS - BOARD DAUGHTER PICTAIL MCP4725
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MCP4725A0T-E/CHTR; MCP4725AOT-E/CHTR; MCP4725AOT-E/CHTR

7.0
7.1
The MCP4725 device uses a two-wire I
interface that can operate on a standard, fast or high
speed mode. A device that sends data onto the bus is
defined as transmitter, and a device receiving data as
receiver. The bus has to be controlled by a master
device which generates the serial clock (SCL), controls
the bus access and generates the START and STOP
conditions. The MCP4725 device works as slave. Both
master and slave can operate as transmitter or
receiver, but the master device determines which mode
is activated. An example of hardware connection
diagram is shown in
initiated by the master (microcontroller) which sends
the START bit, followed by the slave address byte. The
first byte transmitted is always the slave address byte,
which contains the device code, the address bits, and
the R/W bit. The device code for the MCP4725 device
is 1100.
When the device receives a read command (R/W = 1),
it transmits the contents of the DAC input register and
EEPROM. A non-acknowledge (NAK) or repeated
START bit can be transmitted at any time. See
Figure 6-3
the device (R/W = 0), the device will expect write com-
mand type bits in the following byte. See
and
The MCP4725 supports all three I
• Standard Mode: bit rates up to 100 kbit/s
• Fast Mode: bit rates up to 400 kbit/s
• High Speed Mode (HS mode): bit rates up to
Refer to the Phillips I
the I
© 2009 Microchip Technology Inc.
3.4 Mbit/s
Figure 6-2
2
C specifications.
I
COMMUNICATION
OVERVIEW
2
for the read operation example. If writing to
C SERIAL INTERFACE
for the write operation examples.
2
C document for more details of
Figure
8-1. Communication is
2
C operating modes:
Figure 6-1
2
C serial
7.2
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 MCP4725. The device code
is followed by three address bits (A2, A1, A0) which are
programmed as follows:
• The choice of A2 and A1 bits are provided by the
• The A2 and A1 are programmed to ‘00’ (default),
• A0 bit is determined by the logic state of A0 pin.
When the device receives an address byte, it compares
the logic state of the A0 pin with the A0 address bit
received before responding with the acknowledge bit.
The logic state of the A0 pin needs to be set prior to the
interface communication.
FIGURE 7-1:
Note: A2 and A1: Programmed (hard-wired) at the factory.
customer as part of the ordering process. These
bits are then programmed (hard-wired) during
manufacturing
if not requested by customer
The A0 pin can be tied to V
actively driven by digital logic levels. The
advantage of using the A0 pin is that the users
can control the A0 bit on their application PCB
circuit and also two identical MCP4725 devices
can be used on the same bus line.
START bit
Please Contact Microchip Technology Inc. for A2 and
A1 programming options.
A0: Use the logic level state of A0 pin.
Device Addressing
1
Slave Address for MCP4725
Device Code
1
Slave Address
Address Byte
0
Device Addressing.
Read/Write bit
0
Acknowledge bit
DD
MCP4725
A2 A1 A0
Address Bits
or V
DS22039D-page 27
SS
, or can be
R/W ACK