ICM7218

Features:

• Microprocessor Compatible
• Total Circuit Integration On Chip Includes:
- Digit and Segment Drivers
- All Multiplex Scan Circuitry
- 8-Byte Static Display Memory
- 7-Segment Hexadecimal and Code B Decoders
• Output Drive Suitable for LED Displays Directly
• Common Anode and Common Cathode Versions
• Single 5V Supply Required
• Data Retention to 2V Supply
• Shutdown Feature - Turns Off Display and Puts Chip Into Low Power Dissipation Mode
• Sequential and Random Access Versions
• Decimal Point Drive On Each Digit




Pinout






Specifications

Supply Voltage (V_DD to V_SS). . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V
Digit Output Current. . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . 300mA
Segment Output Current . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 50mA
Input Voltage (Any Terminal)(Note 1). . .................. . V_SS -0.3V to V_DD + 0.3V




Description

The ICM7218 series of universal LED driver systems provide, in a single package, all the circuitry necessary to interface most common microprocessors or digital systems to an LED display. Included on chip are an 8-byte static display memory, two types of 7-segment decoders, multiplex scan circuitry, and high current digit and segment drivers for either common-cathode or common-anode displays.

The ICM7218 feature two control lines (WRITE and MODE) which write either 4 bits of control information (DATA COMING, SHUTDOWN, DECODE, and HEXA/CODE B) or 8 bits of display input data. Display data is automatically sequenced into the 8-byte internal memory on successive positive goingWRITE pulses. Data may be displayed either directly or decoded in Hexadecimal or Code B formats.

The ICM7218 feature two control lines (WRITE and HEXA/CODE B/SHUTDOWN), 4 separate display data input lines, and 3 digit address lines. Display data is written into the internal memory by setting up a digit address and strobing theWRITE line low. Only Hexadecimal and Code B formats are available for display outputs.