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17
2-6. Power Control by PLD IC8001
PLD IC8001 performs the power controls shown in Table.2-9 (See Fig.2-4).
Table.2-9 List of Power Controls by PLD IC8001
Terminals
ON
OFF
Remarks
IC8001 Pin-40 [EL PWR]
H
L
The power control signal for Step-up DC-DC CONVERTER IC8301
(H: ON)
(H: ON)
IC8001 Pin-46 [XGSEN_PWR_CTL]
L
H
The power control signal for G-Sensor IC4202 (L: ON)
IC8001 Pin-36 [XHDD_PWR_CTL]
L
H
The power control signal for the HDD driving voltage (L: ON)
1. OEL_VCC voltage (NW-A1000/A1200: 15[V], NW-A3000: 17[V])
When VB voltage is input to pin-2 [VIN] of IC8301, IC8301 starts up. And, when “H” signal is supplied from pin-40 [EL_PWR] of PLD IC8001 to pin-5 [CTRL] of IC8301,
IC8301 starts operation. This circuit operates as follows. The step-up DC-DC converter circuit inside IC8301 controls the duty ratio of the PWM waveform which is output from
pin-8 [SW], with monitoring the voltage input to pin-4 [FB] of IC8301. By the operation, the step-up circuit works, and the OEL_VCC voltage is generated.
2. G-Sensor Circuit
When “L” signal is output from pin-46 [XGSEN_PWR_CTL] of PLD IC8001, G-Sensor IC4202 turns “ON”. Then, the monitoring signals for X, Y and Z-axis are output to
Analog Switch IC6003. Next, Main System Control IC6005 recognizes whether the external shock has been applied to the unit by monitoring the signal which is input to pin-77
[AD_GSEN_XYZ]. IC6005 controls the output of pin-7 [COM] of IC6003 by controlling 2 outputs, pin-46 [GSEN_SEL1] and pin-88 [GSEN_SEL0].
Table.2-10 ANALOG SWITCH IC6003
Input
Output
Remark
Pin-6 [IN1]
Pin-5 [IN2]
Pin-7 [COM]
L
L
OFF
No output
H
L
NO0
Monitoring information for X-axis is output.
L
H
NO1
Monitoring information for Y-axis is output.
H
H
NO2
Monitoring information for Z-axis is output.
3. Power Control for HDD
When “L” signal is output from pin-36 [XHDD_PWR_CTL] of PLD IC8001, Q5001 turns “ON”. Then, 3.3V_HDD voltage is supplied to HDD Drive.
In this model, it does not always supply the driving voltage to HDD drive, to realize the lower power consumption as shown in Fig.2-4. Therefore, PLD IC8001 does not supply
the power on signal to G-SENSOR IC4202 when HDD drive is in the sleep mode.
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