Sony NW-HD5 (serv.man2) Service Manual ▷ View online
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1-4. Power Control by Multi Interface IC7001
MULTI INTERFACE IC7001 performs the power controls shown in Table.1-9 (See Fig.1-3).
Table.1-9 List of Power Control by System Controller IC1003
Terminals
ON
OFF
Remarks
IC7001 Pin-158 [GSEN_PWR_CTL]
H
L
The power control signal for B+ SWITCH IC8001 (H:ON)
IC7001 Pin-159 [BACKLIGHT_PWR]
H
L
The control signal for the backlight driver IC5001 (H: ON)
IC7001 Pin-157 [XHDD_PWR_CTL]
L
H
The power control signal for the HDD driving voltage (L: ON)
Fig.1-3 Power Control by Multi Interface IC7001
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2. Charging Circuit
2-1. Charging Circuit
Fig.2-1 shows the charging circuit. In this model, the charge control IC9002 controls all charge operation. In this unit, when DC-IN 6V voltage or VBUS voltage is supplied to
the unit, it is supplied to Pin-8 [PSEL] of IC9002 via D9008. Then, Charge Control IC9002 starts the operation corresponding to Table.2-1.
Table.2-1 Power Source Selection
Pin-8 [PSEL]
AC
USB
Charging Source
Maximum Charging Rate
System Power Source
H
Present
Absent
AC
ISET1
AC
H
Absent
Present
USB
ISET2
USB
H
Present
Present
AC
ISET1 X 1/2
AC
H
Absent
Absent
N/A
N/A
Battery
= Charging operation with the power supplied from AC power adapter =
When DC-IN 6V voltage is supplied to Pin-4 [AC] of IC9002, the controller section inside IC9002 starts the charging operation. As a rechargeable Lithium-ion Battery is
supplied for the model, the charging method is the constant current and constant voltage method. CHARGE CONTROL IC9002 performs the constant current charging with
the charging current shown in Table.2-6. The charging current can be set with the external register which is connected to Pin-10 [ISET1] of IC9002.
When the constant current charging terminates, CHARGE CONTROL IC9501 changes the mode from the constant current charging method to the constant voltage charging
method.
= Charging operation with VBUS voltage =
When VBUS voltage is supplied to Pin-20 [USB] of IC9002, the controller section inside IC9002 starts the charging operation. As a rechargeable Lithium-ion Battery is
supplied for the model, the charging method is the constant current and constant voltage method. CHARGE CONTROL IC9002 performs the constant current charging with
the charging current shown in Table.2-6. The charging current can be set with the external register which is connected to Pin-7 [ISET2] of IC9002. In this unit, MULTI
INTERFACE IC7001 controls the charging current depending on the current which is supplied from PC. (See Table.2-2)
When the constant current charging terminates, CHARGE CONTROL IC9501 changes the mode from the constant current charging method to the constant voltage charging
method.
Table.2-2 Charging Control by MULTI INTERFACE IC7001
Output Terminal
500[mA]- Permit
100[mA]- Permit
Description
IC7001 Pin-163 [VBUS_LIM]
H
L
Charging current control terminal during USB charging
During USB charging, MULTI INTERFACE IC7001 monitors the PC operation mode. If IC7001 detects that PC is in SUSPEND mode, IC7001 outputs “H” signal from Pin-162
[SUSPEND]. By this “H” signal, Q9005 turns “ON” and “L” signal is input toPin-9 [CE] of IC9002. Then, the controller section inside IC9002 stops and the charging operation
also stops.
also stops.
Table.2-3 Charging Control by MULTI INTERFACE IC7001
Output Terminal
PC: SUSPEND
PC: Normal
Description
IC7001 Pin-162 [SUSPEND]
H
L
Charging operation stops when PC is in SUSPEND mode.
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CHARGE CONTROL IC9002 outputs status signals shown in Table.2-4 while charging to MAIN SYSTEM CONTROLLER IC1003.
Table.2-4 Status signal
IC9002 Pin-2 [XSTAT1]
IC9002 Pin-3 [XSTAT2]
Status
L
L
When pre-charging
L
Open
When normal-charging
Open
L
When the charging operation terminates
Open
Open
Error Status
Battery is not connected
Detecting the abnormal temperature
Detecting the timer fault
Etc.
Table.2-5 Monitoring the charging operation by MAIN SYSTEM CONTROLLER IC1003
IC1003 Pin-148 [PQ2]
IC1003 Pin-149 [PQ3]
Status
L
L
When pre-charging
L
H
When normal-charging
H
L
When the charging operation terminates
H
H
Error Status
Battery is not connected
Detecting the abnormal temperature
Detecting the timer fault
Etc.
Table.2-6 Charging Current
Power Source
Pre-charging
(Until BATT voltage becomes 3[V])
(Until BATT voltage becomes 3[V])
Constant-Current Charging
Remark
AC Power Adapter
Approx. 50mA
Approx. 400mA
-
USB (500mA – Permit)
Approx. 50mA
Approx. 220mA
Varies depending on conditions. The left
values are when connecting with PC
without transferring data
values are when connecting with PC
without transferring data
USB (100mA – Permit)
Approx. 50mA
Approx. 90mA
Varies depending on conditions. The left
values are while LowBATT and no PC
connecting screen appearing
values are while LowBATT and no PC
connecting screen appearing
Note:
The actual charging current of USB charge varies depending on the system conditions. It will be as follows.
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
When both AC adaptor and USB cable are inserted into the unit, charging current of the constant-current charging will be approx. 200mA, about half in the
case of AC adaptor alone.
case of AC adaptor alone.
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Fig.2-1 Charging Circuit
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