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Chapter 1 43
Mechanical off is a condition where all power except the RTC battery has been removed from the system.
1. Initial to On state: When the AC adapter or Battery pack has been plugged into the system, the PC97551 will
be reset and initial all output pins then the system goes into Initial state and waiting for power on event. If the
power button is pressed then the system will go into the ON state.
2. ON to Standby state: The system will go into the Standby state when 963L receives the POS command.
3. ON to Suspend state: The system will go into Suspend state when SB460 receives the S2R command.
4. ON to Hibernate state: The system will go into Hibernate state when SB460 receives the S2D command.
5. ON to Soft Off state: The system will go into Soft Off state when SB460 receives the Soft off command.
6. Standby to ON state: The system will go into ON state when the system receives any wake up events, for
example, power button, Lid switch.
7. Suspend to ON state: The system will go into ON state when the power button is pressed.
8. Hibernate to ON state: The system will go into ON state when the power button is pressed.
9. Soft Off to ON state: The system will go into ON state when the power button is pressed.
Power Control Pin Description
The following table is NS PC97551 power control pin description:
Battery and Charger
Current Amplifier: MAX8724
Charge PWM Control: IMD2AT108
3-13.1. DC to DC Converter
Hibernate(S4) (8)
Soft Off(S5) (9)
State
Output Pin
S5_ON 3VAUXEN SUSON MAINON VRON
Initial 0 0 0 0 0
ON(S0) 1 1 1 1 1
Standby(S1) 1 1 1 1 1
Suspend(S3) 1 1 1 0 0
Hibernate(S4) 1 1 0 0 0
Soft Off(S5) 1 0 0 0 0
PARAMETER CONDITIONS MIN TYP MAX UNITS
Min Input Range VA 18 19 20 V
Input Low Voltage M/A-, D/C-, BL/C-, REFON 0.8 V
Input high Voltage M/A-, D/C-, BL/C-, REFON 2.5 5.5 V
Charge Voltage CV-SET =0V 15.93 16.09 16.25 V
Charge Voltage CV-SET =5V 16.95 17.11 17.27 V
Charge Current CC-SET =0.5V (for Li -ion) 0.1 0.25 0.4 A
Charge Current CC-SET =5V (for Li-ion) 3.73 3.93 4.13 A
Charge PWM Frequency 200 KHz
Efficiency VA=19V Output 12V/1.7A 91 %
TI TPS51120 PWM chip: 5V & 3.3V &15V
PARAMETER CONDITIONS MIN TYP MAX UNITS
5V Current 0-3A 4.8 5.0 5.2 V
3.3V Current 0-3A 3.14 3.35 3.76 V