Silicon Laboratories Stepper Machine Manual do Utilizador Página 4

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AN428
4 Rev. 0.6
3. Choosing the MCU
For JumpStart, consider these MCU features:
Physical size
Memory size
Serial interface (I
2
C or SPI)
Digital pin count
It is possible to switch to one-time programmable (OTP) MCUs after the code has been developed in flash-based
MCUs to save cost.
Use the online parametric search for choosing the best MCU. You can find this search tool on
http://www.silabs.com. Select Products MCUs, and click the Parametric Search link near the right side of the
page.
4. Example Using the C8051F30
A Silicon Labs C8051F301 (F301) MCU (3 x 3 mm) and an Any-Frequency, Any-Output Clock Generator
(Si5338N) connected via I
2
C is configured for a gigabit Ethernet (GigE) application. The frequency plan required
has a 25 MHz input with a crystal and two output frequencies of 25 MHz with 3.3 V CMOS on CLK0 and 125 MHz
using 3.3 V LVDS on CLK1.
Figure 4. Example Block Diagram
Si5338N
C8051F301
I2C
25MHz
GigE PHY
125 MHz 3.3V LVDS
CPU
25 MHz 3.3V CMOS
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