SAA7392HLM2B View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'SAA7392HLM2B' PDF : 76 Pages View PDF
Philips Semiconductors
Channel encoder/decoder CDR60
Preliminary specification
SAA7392
7.10 Motor control
The spindle motor is controlled by a fully integrated digital servo sub-system within the SAA7392. Information from the
data FIFO, data recovery PLL and tacho inputs may be used to calculate the motor control output signals.
The frequency set-point, the FIFO settings and coefficients G, Ki and Kf are all programmable using the seven motor
control registers. The motor can be controlled in either Pulse Width Mode (PWM) or Pulse Density Mode (PDM).
The tacho control subsystem allows a range of different motor tacho systems to be used, the modes and prescalers are
programmable via the tacho register set. (Note due to pin multiplexing, PWM motor control mode and CAV mode using
tacho control are mutually exclusive).
handbook, full pagTe1width
T2
MOTO2/T3
TRANSITION
DETECTOR
Ktacho
TACHO
LOW-PASS
FILTER
tacho
frequency
COMPARE
tacho
interrupt
Wobble frequency
PLL frequency
FIFO filling
XError
frequency/tacho
set-point
tacho
set-point
−
++
1/(2.667 × system clock)
FIFO half-full
set-point
−
+
+
SW1
SW2
+
Ki
Kf
+
24T
reset
overflow
detector
PDM/PWM
MODULATOR
G
motor
pads
analog output
stage gain
M
GE motor
EXTERNAL
MOTOR CIRCUIT
MGR807
Fig.17 Motor servo block diagram.
2000 Mar 21
39
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