MicroResearch Gravitech Group I2C-DAC I2C User manual
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
GRAVITECH.US
uResearch
GRAVITECH GROUP
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
The I2C-DAC board is a 6-pin CMOS 8-bit
digital-to-analog converter device using
I2C bus. There are no external
components required. Only two signal
lines SDA and SCL plus supply voltage
and ground are required to be connected.
This makes it perfect for embedded
systems that require digital-to-analog
converter.
This board features innovations that set it
apart from other digital-to-analog
converter module. Innovations feature like
on-board I2C address jumpers, pull-up
resistors, and power LED. The module
can be quickly connected directly on to
the breadboard. The board is small and
compact in size 0.70 x 0.47 inches.
The I2C-DAC is designed base on
DAC5571 IC. It is a low-power, single-
channel, 8-bit buffered voltage output
DAC. Its on-chip precision output amplifier
allows rail-to-rail output swing to be
achieved.
The output voltage range of the DAC is 0V
to VCC. The I2C-DAC incorporates a
power-on-reset circuit that ensures that
the DAC output powers up at zero volts
and remains there until a valid write to the
device takes place.
A jumper pins vary the fixed I2C address
and allow up to two devices to share the
same I2C bus.
•Up to 2 devices on the same bus
•Resolution: 8-bit
Fast Update Rate: 188 KSPS
•I
2C Interface up to 3.4 Mbps
•On-Chip Output Buffer Amplifier,
Rail-to-Rail Operation
•Stand alone module, no external
components required
•On-board I2C address jumpers,
pull-up resistors and power LED
•Decoupling supply voltage
•Design easy for breadboard
•High quality double sided PCB
•All SMT components
•Small and compact in size 0.70 x
0.47 inches
•Dual row 0.6” width, 0.1” pitch
header pins
•Flexible operating power supply
voltage range of +2.7V to +5.5V
•Suitable for 3.3V or 5.0V
microcontroller
•Process Control
•Data Acquisition Systems
•Closed-Loop Servo Control
•Thermostat controls
•Audio and Video
•Peripherals
•And much more…
* I2C is a trademark of Philips Semiconductors Corporation.
Description Features
Applications
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
VOUT (1) NC (6)
GND (2) SCL (5)
VCC (3) SDA (4)
Pin No. Name Type Description
1 VOUT Output Analog output voltage from DAC
2 GND PWR Supply ground
3 VCC PWR Supply voltage
4 SDA I/O Serial data line
5 SCL Input Serial clock line
6 NC NC No connect
The I2C-DAC board needs an external
+2.7VDC – +5.5VDC supply.
•VCC: is an input power +2.7VDC –
+5.5VDC to I2C-DAC board.
•GND: is a common ground for
every pin. This pin MUST be
connected to ground of the external
power supply.
The I2C-DAC operates as a slave on the
I2C bus. Only two signal lines SDA and
SCL are required for I2C bus. Please refer
to I2C specification for more information.
This is an analog output voltage from the
I2C-DAC. The output is contains the
buffer amplifier. The output buffer
amplifier is a gain-of-2 amplifier, capable
of generating rail-to-rail voltages on its
Interfaces I2C pins:
Pin Configuration
Power:
VOUT pin:
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
output, which gives an output range of 0 V
to VCC. It is capable of driving a load of 2
kΩin parallel with 1000 pF to GND. The
source and sink capabilities of the output
amplifier can be seen in the typical
characteristics curves. The slew rate is 1
V/μs with a half-scale settling time of 7 μs
with the output unloaded.
Default address shipped from the
manufacture is 0x98 for write and 0x99 for
read.
A0 = GND
The address can be easily change by
solder the bridge between the A0 pin to
VCC or GND at the bottom of the module.
This is allows up to two devices to share
the same I2C bus.
The green LED on the module is
illuminating when the power applied. The
power-on LED is enabled from the
manufacture. It can be disabling for light
sensitive or low current requirement
application by remove the solder bridge
on “PW” at the bottom of the module.
I2C bus specification required to have pull-
up resistors on SDA and SCL pin. I2C-
DAC come with these two pull-up resistors
enabled from the manufacture. It can be
disabling when connect to I2C bus that
already have pull-up resistors by remove
the solder bridge on the “PU” at the
bottom of the module.
Module Configuration
I2C address:
Power-on LED:
I2C pull-up resistors:
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
Below are the default settings from the
manufacture.
I2C-DACTM I2C 8-Bit Digital-to-Analog Converter
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
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