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DAC5574 Datasheet(PDF) 25 Page - Texas Instruments

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Part No. DAC5574
Description  QUAD, 8-BIT, LOW-POWER, VOLTAGE OUTPUT, I2C INTERFACE DIGITAL TO ANALOG CONVERTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

DAC5574 Datasheet(HTML) 25 Page - Texas Instruments

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APPLICATION INFORMATION
BASIC CONNNECTIONS
4
5
1
2
3
6
8
7
10
9
DAC5574
VOUTA
VOUTB
VDD
VOUTC
GND
VOUTD
A1
A0
SDA
SCL
SDA
SCL
I2C Pullup Resistors
1 k
Ω to 10 kΩ (typical)
VDD
Microcontroller or
Microprocessor With
I2C Port
NOTE: DAC5574 power and input/output connections are omitted for clarity, except I2C Inputs.
USING GPIO PORTS FOR I
2C
DAC5574
SLAS407 – DECEMBER 2003
The following sections give example circuits and tips for using the DAC5574 in various applications. For more
information, contact your local TI representative, or visit the Texas Instruments website at http://www.ti.com.
For many applications, connecting the DAC5574 is extremely simple. A basic connection diagram for the
DAC5574 is shown in Figure 38. The 0.1 µF bypass capacitors help provide the momentary bursts of extra
current needed from the supplies.
Figure 38. Typical DAC5574 Connections
The DAC5574 interfaces directly to standard mode, fast mode and high-speed mode I
2C controllers. Any
microcontroller's I
2C peripheral, including master-only and non-multiple-master I2C peripherals, work with the
DAC5574. The DAC5574 does not perform clock-stretching (i.e., it never pulls the clock line low), so it is not
necessary to provide for this unless other devices are on the same I
2C bus.
Pullup resistors are necessary on both the SDA and SCL lines because I
2C bus drivers are open-drain. The size
of the these resistors depend on the bus operating speed and capacitance on the bus lines. Higher-value
resistors consume less power, but increase the transition times on the bus, limiting the bus speed. Lower-value
resistors allow higher speed at the expense of higher power consumption. Long bus lines have higher
capacitance and require smaller pullup resistors to compensate. If the pullup resistors are too small the bus
drivers may not be able to pull the bus line low.
Most microcontrollers have programmable input/output pins that can be set in software to act as inputs or
outputs. If an I
2C controller is not available, the DAC5574 can be connected to GPIO pins, and the I2C bus
protocol simulated, or bit-banged, in software. An example of this for a single DAC5574 is shown in Figure 39.
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