PSoC® 3: CY8C32 Family
Data Sheet
Source and sink option for current output
8.7 DAC
The CY8C32 parts contain a Digital to Analog Converter (DAC).
The DAC is 8-bit and can be configured for either voltage or
current output. The DAC supports CapSense, power supply
regulation, and waveform generation. The DAC has the following
features:
8 Msps conversion rate for current output
1 Msps conversion rate for voltage output
Monotonic in nature
Data and strobe inputs can be provided by the CPU or DMA,
or routed directly from the DSI
Adjustable voltage or current output in 255 steps
Programmable step size (range selection)
Dedicated low-resistance output pin for high-current mode
Eight bits of calibration to correct ± 25 percent of gain error
Figure 8-8. DAC Block Diagram
I
Range
source
1x,8x, 64x
Vout
Reference
Source
Scaler
Iout
R
3R
I sink Range
1x,8x, 64x
8.7.1 Current DAC
8.7.2 Voltage DAC
The current DAC (IDAC) can be configured for the ranges 0 to
32 µA, 0 to 256 µA, and 0 to 2.048 mA. The IDAC can be
configured to source or sink current.
For the voltage DAC (VDAC), the current DAC output is routed
through resistors. The two ranges available for the VDAC are 0
to 1.024 V and 0 to 4.096 V. In voltage mode any load connected
to the output of a DAC should be purely capacitive (the output of
the VDAC is not buffered).
Document Number: 001-56955 Rev. *J
Page 58 of 119
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