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HT7470

Fast Battery Charger

Holtek Semiconductor 

HT7470

Fast Battery Charger

Features

• Fast charge NiCd battery

• High resolution -∆V detector to determine

peak charging voltage

• Auto cutoff for defective battery

• Fast charge from C/2 to 4C rate

• C/10 trickle charge rate

• Adjustable thermo protection

• Built-in safety timer

• Direct drive LED display and alarm buzzer

• Automatic switching from fast to trickle

charge

• Warm up option for battery

• Maximum voltage protection

• Auto-start function

• 12-bit A/D converter

General Description

The HT7470 is a 4-bit single-chip microcom-

puter specially designed for NiCd battery fast

charge/discharge control. The advanced unique

design and multiple protection features of the

HT7470 eliminate excessive external compo-

nents in application circuits, and ensure bat-

tery safety and high performance.

Pin Assignment

Block Diagram

Pin Description

Pin No. Pin Name I/O

Description

1

EOC

End of A/D conversion. The A/D conversion process takes place

I during the high period on this pin. When this pin falls low, this

indicates the end of the A/D conversion.

2

TC

I Over temperature input, active low.

3

LED1

O LED 1 indicates the charge, discharge and battery status.

4

VDD

— Positive voltage supply. (5V)

5

OSCO

6

OSCI

O OSCI and OSCO are connected to a resistor to generate the system

I clock. The frequency of the system clock is 1MHz.

7

VSS

— Negative power supply.

8

RST

I Input to reset internal LSI, active low.

1

25th Aug ’94

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