Toshiba e-studio182 - Polygonal Motor Control Circuit; Laser Optical Unit

e-STUDIO182/212/242 © 2009 TOSHIBA TEC CORPORATION All rights reserved
LASER OPTICAL UNIT
7 - 6
7.4 Polygonal Motor Control Circuit
The polygonal motor is a DC motor rotated by a clock signal (PMTRCLK) output from the SoC. This
motor is controlled under PLL (Phase Locked Loop) to realize an accurate and constant rotation. Its
rotation status is converted to a status signal (PMTRSTS-0) and then output to the ASIC. PMTRSTS-0
signal moves to a low level only when the rotation status of the motor is constant. The SoC detects the
rotation status with this signal, and emits a laser beam only when the rotation status is constant.
Fig. 7-9
Signal Function Low level High level
PMTR-0 Polygonal motor ON signal ON OFF
PMTRCLK Polygonal motor reference clock - -
PMTRSTS-0 Polygonal motor PLL control signal Rotating at a constant
speed
Stopping or error
IC23
ASIC
IC53
SoC
PMTR-0
PMTRSTS-0
PMTRCLK
PMTRCLKB
PMTR-0A
Polygonal motor
+5V
+24V
PG
IC24
IC15
MAIN board