Datasheet

Pin Descriptions

Pin Name Description Minimum Typical Maximum Units

1 (White) Signal Input; TTL or CMOS 3.3 5.0 Vservo + 0.2 V

2 (Red) Vservo Power Supply 6.0 7.4 8.4 V

3 (Black) Vss Ground 0 V

Precautions



Do not use this servo with an unregulated wall-mount supply. Such power supplies may deliver

variable voltage far above the stated voltage.

 Do not power this servo through your microcontroller.

 Servo current draw can spike while under peak load; stall current can approach 1 A. Be sure

your application's regulator is prepared to supply adequate current for all servos and other

circuits used in combination.

Downloads and Additional Resources

The latest version of this document, additional resources and example applications are available on the

High Speed Continuous Rotation Servo product page. Go to www.parallax.com and search “900-00025”.

Servo Control

The Parallax High Speed Continuous Rotation Servo is controlled through pulse width modulation.

Rotational speed and direction are determined by the duration of a high pulse, refreshed every 20 ms.

 A 1.52 ms control pulse makes the servo stand still (unless calibrated to 1.50 ms, see Calibration

– Changing the Servo’s "Center" Value, page 4).

 As pulse width decreases from 1.52 ms to 1.3 ms, the servo gradually rotates faster, clockwise.

 As pulse width increases from 1.52 ms to 1.7 ms, the servo gradually rotates faster,

counterclockwise.