CONFIDENTIAL 10
Charging IC is MAXIM1640. There are three charging modes Top-off mode, Fast-charge mode, and
Pulsetrickle mode. Pulse-trickle mode is for battery in over-discharge situation. Fast-charge is for
battery in normal voltage. Top-off is after fast-charge mode for charging battery voltage upto full
voltage (21V).
Card Board
The circuit theory of card board can be divided into three parts.
1. CPU and serial EPROM
This card board uses an 80-series CPU with 64KB on-chip FLASH EPROM to do central control,
including LCD backlight control, button-pushed sensing, and communication with main board. The
serial EPROM stores setting data of LCD that is got from the calibration process. CPU will read the
serial EPROM and complete the initial setting for LCD after power on.
2. LCD and backlight LED
The 2.5-inch TFT LCD panel is used to display images and messages. It's backlight is low DC voltage
ultralight white-LED.
3. Memory Card Socket and Interface
CF card socket for CF memory card, and 4-in-1 card socket for SM, MMC, SD, and MS memory cards.
And CF control by ASIC, SM, MMC, SD, and MS control by PS3002.
