Digital Servo HT45RM22 / HT45RM23 Characteristics 5g Digital Servo 8-bit ASSP MCU with H-Bridge driver Internal LDO – reduces need for external power supply components Internal H-Bridge driver – reduces need for external MOS drive transistor External resistors and capacitors simplified, reduces costs and PCB areas 10-pin MSOP package suitable for small outline model servo applications HT45RM22 HT45RM23 Application Areas Servo Modules, Radio-Control Models, Robotics, LEGO type toys etc. Block Diagram Li Battery MCU LDO PWM Command 1000~2000us servo PTM (Capture) High Voltage Driving Control Algorithms Motor ADC Potentiometer Application Circuit P1 P2 3 2 1 VDD VR CMD 3 2 1 VDD VDDM GND C2 1uF GND Potentiometer Servo Power & Control Input GND C3 10uF R1 51 R2 1K U1 VR C4 0.1uF M+ 1 2 3 4 5 VSS PA2/AN0 N.C VSS1 PA0/OUT0 VCC VDD&VDDA PA7/TC1/INT VCC1 PA1/OUT1 HT45RM22/23 MCU HT45RM22/23 Motor Servo - A GND + GND 10 9 8 7 6 GND VDDM VDD CMD C1 10uF MGND