Vibramotor - Siemens SXG 75 Service Repair Documentation

14 Vibramotor

The vibration motor is mounted in the lower case. The electrical connection to the PCB is realised
with pressure contacts XG1302 and XG1303.
The vibration motor is controlled with the PM6650 vibra motor driver as illustrated below.
The vibration driver is an SBI-programmable voltage output that is referenced to VPH_PWR. When
off, its output voltage is VPH_PWR.
An external diode, V1300, protects the PM6650 driver from the motor's inductive kickback. The
motor is connected between VPH_PWR and pin 25 (VIB_DRV_N); the voltage across the motor is:
Vm =VPH_PWR - Vout where Vout is the PM6650 voltage at pin 25. The driver (pin 25) is
programmable to support motors from 1.2 to 3.1V (in 100 mV increments). The voltage is set to 2.8V
for optimal performance.
Vibra driver (PM6650)
Technical Documentation
TD_Repair_L3_SXG75_R1.0.pdf
Company Confidential
2006©BenQ
Release 1.0
01/2006
Page 62 of 73