The SD20 chip is a pre-programed PIC16F872 running at 8MHz.  The SD20 comes with the 8MHz resonator.  Position commands for up to 20 servos can be sent to the chip via an I2C bus connection.

This item is just a chip and resonator.  The user must build a board and connectors and have a controller with I2C capability in order to use this device.   Follow the link below for the easy to build schematic and OOPic example.

Features Include:

• I2C bus control, same protocol as popular EEPROM's such as 24C02
• Position Control of up to 20 Servo's
• Servo's inactive at power up until first position sent to it
• Scan time 20mS minimum, then proportional to number of servo's used
• Buffer can be read as well as written saving valuable memory resources on small controllers
• Standard mode - 256 bit resolution from 1mS to 2mS
• Expanded mode - Allows pulse to exceed 1mS to 2mS range for greater movement
• 0.5uS Timer produces jitter free outputs