Technical data

System Overview

Designer Reference Manual DRM043/D — Rev 0

8 System Overview MOTOROLA

• Applied constant current and constant voltage charge method.

• Implemented trickle charge mode when battery voltage is too low.

• Charge cut off and signify battery full when charging current fall

below 75mA.

• Over current, over voltage, over temperature protection.

• In-circuit programming for firmware upgrade

1.4 8-pin PDIP MC68HC908QT2 Feature

MC68HC908QT2 is an 8-pin MCU which has on-chip in-application

programmable, 1536 bytes of user FLASH memory (with internal

program/erase voltage generation). Good enough for small application

like battery charger. It has128 bytes RAM, 4 channel 8 bit ADC. The

trimmable internal oscillator with accuracy +/- 5% helps to reduce the

system cost of the application by eliminate the external crystal

oscillation circuit. It has one 16 bit timer module with 2 timer channel

which can generated PWM signals. Besides the Vdd and Vss pins, all

other 6 pins can be used by the application. These pins are multiplex

together with the I/O, ADC, KBI, TIM. It gives great flexibility for the

user's application.

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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