UP-X200 (serv.man9). Service Manual - Sharp EPOS Service Manual (repair manual). Page 12

UP-X200

System Block Diagram

– 10 –

In its initial status, the charging IC is ON (soft controlled) and is turned OFF without battery or at a fully charge state.

The charge current design value is 1A max, and uses the CC-CV method.

The UP-X200 features two main batteries in parallel and to increase the discharge ratio of these batteries, a software controlled switch to bypass the
diode is furnished. This switch is software controlled to ensure that the battery with the greater remaining capacity discharges, resulting in a more
equal wear on both batteries.

When set on the charger, this switch ensures that both batteries are off and that power is supplied to the system from the external power supply, sav-
ing wear on the main battery.

TC6393_VCC3

IC1308

3.3V

SA_PWR_EN

0V

I/O power supply for LCDC

VAB

(none)

3.5 - 4.3V

3.5 - 4.3V

Battery/external power supply output (Power supply source)

VCC_LCDP8V

IC601

+8V

LCD8V_PWR_EN

0V

+8V power supply for liquid crystal drive

VCC_LCDN4V

IC602

-4V

LCD8V_PWR_EN

0V

-4V power supply for liquid crystal drive

VCC_LCDN8V

Q601

-8V

LCDN8_PWR_EN

0V

-8V power supply for liquid crystal drive

VCC_LCD5V

Q603

5V

LCD5V_PWR_EN

0V

5V power supply for liquid crystal drive

VCC_LCD3V

IC605

3.3V

LCD3V_PWR_EN

0V

3.3V power supply for liquid crystal drive

Power Supply Name

Switch

(Regulator)

Output

Voltage

Control Signal

OFF

Application

Charging 
terminal  

Charging 
circuit 1

To power supply 
circuit

 

Input from AC adapter

Discharge 
switching signal

 

Charging 
circuit 2