SAA7324H NXP Semiconductors, SAA7324H Datasheet - Page 32

• Manufacturer Part Number: SAA7324H
• Manufacturer: NXP Semiconductors

Specifications of SAA7324H

• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
During reset (i.e. RESET pin is held LOW) the
RA, FO and SL pins are high-impedance.
7.14.10 L
The LDON pin (open-drain output) is used to switch the
laser off and on. When the laser is on, the output is
high-impedance. The action of the LDON pin is controlled
by the xtra_preset parameter; the pin is automatically
driven if the focus control loop is active.
7.14.11 R
The shock detector (see Fig.22) can be switched on during
normal track following, and detects within an adjustable
frequency whether disturbances in the radial spot position
relative to the track exceed an adjustable level (controlled
by shock_level).
Every time the radial tracking error exceeds this level the
radial control bandwidth is switched to twice its original
bandwidth and the loop gain is increased by a factor of 4.
The shock detection level is adjustable in 16 steps from
0% to 100% of the traverse radial amplitude which is sent
to an amplitude detection unit via an adjustable band-pass
filter (controlled by sledge_parm1); lower corner frequency
can be set at either 0 or 20 Hz, and upper corner
frequency at 750 or 1850 Hz. The shock detector is
switched off automatically during jump mode.
2000 Jun 26
handbook, full pagewidth
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
ASER INTERFACE
ADIAL SHOCK DETECTOR
RE
HIGH-PASS FILTER
(0 or 20 Hz)
Fig.22 Block diagram of radial shock detector.
LOW-PASS FILTER
(750 or 1850 Hz)
32
7.15
Communication on the microcontroller interface can be
set-up in two different modes:
It should be noted that only servo commands can be used
therefore, writing to decoder registers 0 to F, reading
decoder status and reading Q-channel subcode data must
be performed by servo commands.
4-wire bus mode: protocol compatible with SAA7345
(CD6) and TDA1301 (DSIC2) where:
– SCL = serial clock
– SDA = serial data
– RAB = R/W control and data strobe (active HIGH) for
– SILD = R/W control and data strobe (active LOW) for
I
behaves as slave device, activated by setting
RAB = HIGH and SILD = LOW where:
– I
– I
– Maximum data transfer rate = 400 kbits/s.
2
C-bus mode: I
writing to decoder registers 0 to F, reading status bit
selected via decoder register 2 and reading
Q-channel subcode
servo commands.
2
2
Microcontroller interface
C-bus slave address (write mode) = 30H
C-bus slave address (read mode) = 31H
DETECTION
AMPLITUDE
2
C-bus protocol where the SAA7324
OUTPUT
SHOCK
MGC914
Product specification
SAA7324