MCP4725A0T-E/CH Microchip Technology, MCP4725A0T-E/CH Datasheet - Page 33

• 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

8.0
The MCP4725 device is one of Microchip’s latest DAC
device family with non-volatile EEPROM memory. The
device is a general purpose resistive string DAC
intended to be used in applications where a precision,
and low power DAC with moderate bandwidth is
required.
Since the device includes non-volatile EEPROM
memory, the user can use this device for applications
that require the output to return to the previous set-up
value on subsequent power-ups.
Applications generally suited for the MCP4725 device
family include:
• Set Point or Offset Trimming
• Sensor Calibration
• Portable Instrumentation (Battery Powered)
• Motor Speed Control
8.1
The SCL and SDA pins of the MCP4725 are open-drain
configurations. These pins require a pull-up resistor as
shown in
resistors depends on the operating speed (standard,
fast, and high speed) and loading capacitance of the
I
less power, but increases the signal transition time
(higher RC time constant) on the bus. Therefore, it can
limit the bus operating speed. The lower resistor value,
on the other hand, consumes higher power, but allows
higher operating speed. If the bus line has higher
capacitance due to long bus line or high number of
devices connected to the bus, a smaller pull-up resistor
is needed to compensate the long RC time constant.
The pull-up resistor is typically chosen between 1 kΩ
and 10 kΩ ranges for standard and fast modes, and
less than 1 kΩ for high speed mode.
FIGURE 8-1:
Connection with A0 pin tied to V
© 2009 Microchip Technology Inc.
Analog
Output
2
C bus line. Higher value of pull-up resistor consumes
Note 1: R is the pull-up resistor. Typically
2: A0 can be tied to V
TYPICAL APPLICATIONS
Connecting to I
Pull-Up Resistors
1
2
3
Figure
V
V
V
MCP4725
1 ~ 10 kΩ
MCU
0.1 µF
OUT
SS
DD
SCL
SDA
8-1. The value of these pull-up
A0
10 µF
I
2
6
5
4
C Bus Interface
V
2
DD
C BUS using
SS
, V
SS
DD
.
or driven by
V
R
DD
(MASTER)
To MCU
R
Two devices with the same A2 and A1 address bits can
be connected to the same I
address pin (Example: A0 pin of device A is tied to V
and the other device’s pin is tied to V
8.1.1
The user can test the presence of the MCP4725 on the
I
This test can be achieved by checking an acknowledge
response from the MCP4725 after sending a read or
write command. Here is an example using
(a) Set the R/W bit “HIGH” in the address byte.
(b) If the MCP4725 is connected to the I
(c) A STOP or repeated START bit can then be issued
FIGURE 8-2:
2
C bus line without performing the data conversion.
SDA
SCL
will then acknowledge by pulling SDA bus LOW
during the ACK clock and then release the bus
back to the I
from the Master and I
continue.
START
Bit
DEVICE CONNECTION TEST
1
1
Device bits
2
C Master.
2
1 0
3
I
Address Byte
2
4
C Bus Connection Test.
0 A2 A1 A0 1
Address bits
2
5
C bus by utilizing the A0
MCP4725
2
C communication can
6
7
DS22039D-page 33
SS
8
).
R/W
2
C bus line, it
9
MCP4725
Response
Figure
START
Bit
8-2:
DD
,