Schematic/Block Diagram; Digital-To-Analog Converter (Dac) - Intel PXA27 Series Design Manual

Inter-Integrated Circuit (I2C)
9.3

Schematic/Block Diagram

2
The I C bus is used by many different applications. This reference guide presents two possible
methods for using the I
•
The first method controls a digital-to-analog converter (DAC) to vary the DC voltage to the
processor core.
•
The second method expands the capabilities of an existing compact flash socket.
9.3.1

Digital-to-Analog Converter (DAC)

See Figure 9-1
Linear Technology micropower DAC. The DAC output is connected to the buck converter
feedback path and is controlled by the I
feedback path that affects the processor core voltage.
Figure 9-1. Linear Technology DAC with I
II:9-2
2
C bus interface:
for illustration of the schematic showing the connection of the I
2
C bus interface unit. The DAC modifies the voltage of the
2
C Interface
SCL 5
SCL
1
SDA
SDA
4
Vcc
Vout
LTC1663C35
GND
2
®
Intel PXA27x Processor Family Design Guide
2
C interface to a
1ΜΩ
3