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2. Power Control Circuit
2-1. VB voltage
Power Control IC9001 is the main power control IC and starts up when VB voltage is supplied to pin-87 [VCC] and pin-88 [VCC].
1. Driving voltage (VB Voltage)
When the unit is in the battery driving
Voltage from the built-in battery is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9001.
Q9001 turns “ON” in the battery driving only. Q9003 turns “OFF” in the battery driving because it is used for charging the battery.
When the unit is in the AC power adapter driving
The voltage (DCIN_5V) which is supplied from AC power adapter is supplied from VBUS line of a multiple type connector of the unit.
The DCIN_5V voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9005, D9002 and Q9002. When the unit starts-up and Main System
Controller IC6005 recognizes that the unit is in the AC power adapter driving, it outputs this information to PLD IC8001. Then PLD IC8001 sets the output of pin-76 [GPIO0] to
“L” with the serial communication. By this “L” signal, Q9011 and Q9013 turn “ON” and DCIN_5V voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001
via D9001.
When the unit is connected to PC
When the unit is connected to PC, the VBUS voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9005, D9002 and Q9002.
When the unit is connected to an optional cradle
When the unit is connected to the cradle and the power voltage is supplied from the cradle to the unit, it is supplied to DCIN line of the multiple type connector of the unit.
Then, it is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via D9001.
2. Power Source Detection
Power Control IC9001 detects the power source with each input terminal shown in Table.2-1. And also, it outputs the power source information to PLD IC8001 and Main
System Control IC6005 with each output terminal shown in Table.2-2.
1. Driving voltage (VB Voltage)
When the unit is in the battery driving
Voltage from the built-in battery is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9001.
Q9001 turns “ON” in the battery driving only. Q9003 turns “OFF” in the battery driving because it is used for charging the battery.
When the unit is in the AC power adapter driving
The voltage (DCIN_5V) which is supplied from AC power adapter is supplied from VBUS line of a multiple type connector of the unit.
The DCIN_5V voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9005, D9002 and Q9002. When the unit starts-up and Main System
Controller IC6005 recognizes that the unit is in the AC power adapter driving, it outputs this information to PLD IC8001. Then PLD IC8001 sets the output of pin-76 [GPIO0] to
“L” with the serial communication. By this “L” signal, Q9011 and Q9013 turn “ON” and DCIN_5V voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001
via D9001.
When the unit is connected to PC
When the unit is connected to PC, the VBUS voltage is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via Q9005, D9002 and Q9002.
When the unit is connected to an optional cradle
When the unit is connected to the cradle and the power voltage is supplied from the cradle to the unit, it is supplied to DCIN line of the multiple type connector of the unit.
Then, it is supplied to pin-87 [VCC] and pin-88 [VCC] of Power Control IC9001 via D9001.
2. Power Source Detection
Power Control IC9001 detects the power source with each input terminal shown in Table.2-1. And also, it outputs the power source information to PLD IC8001 and Main
System Control IC6005 with each output terminal shown in Table.2-2.
Table.2-1 Detecting of Power Source
Input Terminal
Description
IC9001 Pin-61[VBATT]
Battery voltage input terminal
IC9001 Pin-58[DCIN_MONI]
Power detection terminal for AC Power Adapter (H: DCIN_5V voltage is supplied to the unit.)
IC9001 Pin-59[VBUS_IN]
Power detection terminal for VBUS from PC (H: VBUS voltage is supplied to the unit.)
Table.2-2 Detecting of Power Source
Output Terminal
Description
Application
IC9001 Pin-62[VBATTMON]
Battery voltage monitoring output
Output to MAIN SYSTEM CONTROLLER IC6005
IC9001 Pin-64[XDCIN_DET]
L: when DCIN_5V is supplied to the unit from AC power adapter.
(DCIN_5V is more than 4.0[V])
Open: when DCIN_5V is not supplied to the unit.
(DCIN_5V is more than 4.0[V])
Open: when DCIN_5V is not supplied to the unit.
- Output to PLD IC8001
- Used for the wake-up condition of IC9001
- Used for the wake-up condition of IC9001
IC9001 Pin-65[XVBUS_DET]
L: when VBUS is supplied to the unit from PC.
(VBUS is more than 4.0[V])
Open: when VBUS is not supplied to the unit from PC.
(VBUS is more than 4.0[V])
Open: when VBUS is not supplied to the unit from PC.
Used for the wake-up condition of IC9001.
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