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8
1-3. 3.3V/2.4V Generator Circuit
Fig.1-2 shows the 3.3V/2.4V generator circuit.
= 3.3V voltage =
The capacitor C9011 which is connected to Pin-33 of Power Control IC9003 is mounted for adjusting the output timing of Pin-34 of IC9003. This signal line becomes “H” in the
wake-up mode and “L” in the sleep mode. In this unit, this signal controls ON and OFF of 3.3V DC-DC CONVERTER IC9004.
When IC9003 is in the wake-up mode, CRST2 signal line becomes “H”. By this “H” signal, Q9009 turns “OFF” and “L” signal is input to Pin-1 [SHDN] of 3.3V DC-DC
CONVERTER IC9004. Then, IC9004 starts-up. When IC9004 starts up, IC9004 outputs the switching waveform from Pin-4 [SW]. Then, 3.3[V] is generated by the DC-DC
converter circuit composed of IC9004, L9003 and C9005. Then, the created voltage is supplied as the following 3 kinds of voltage.
3.3V voltage
3.3V_A voltage
3.3V_HDD voltage
= Mode Control of 3.3V DC-DC CONVERTER IC9004 =
3.3V DC-DC CONVERTER IC9004 has the lower power consumption mode and this mode is controlled by the signal output from pin-157[XHDD_PWR_CTL] of MULTI
INTERFACE IC7001. IC7001 outputs “H” signal when it recognizes that the following condition is satisfied.
= Condition that IC9004 enters the lower power consumption mode =
HDD drive is “OFF”
Table.1-8 Mode control of 3.3V DC-DC CONVERTER IC9004
IC7001 Pin-157 [XHDD_PWR_CTL]
Lower Power Consumption Mode
L
OFF
H
ON
= 2.4V voltage =
When 3.3V_A voltage is supplied, it is input to pin-4[VDD] and pin-1[CE] of +2.4V REGULATOR IC4302. Then IC4302 starts up. IC4302 generates +2.4[V] and outputs it from
pin-3[VOUT] as 2.4V_AD voltage and 2.4V_DAC voltage for the unit.
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