Holtek Semiconductor HT7470
The HT7470 is a 4-bit single-chip microcomputer specially designed for NiCd battery fast charge/discharge control. The advanced unique design and multiple protection features of the HT7470 eliminate excessive external components in application circuits, and ensure battery safety and high performance. The A/D conversion process takes place I during the high period on this pin.| Part No. | HT7470 |
|---|---|
| Datasheet | HT7470 Download |
| Manufacturer |  Holtek Semiconductor |
| Description | Fast Battery Charger |
| Buy | Stock & Price |
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
Pin Assignment Block Diagram PinDESCRIPTION
Pin No. Pin Name I/ODESCRIPTION
1 EOC End of A/D conversion. 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.
