PT6955 PTC | Alldatasheet

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Technical content

Princeton Technology Corp. LED Driver IC PT6955 PT6955 v1.2 Page 1 Updated December 2001 Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw

DESCRIPTION

PT6955 is an LED Controller driven on a 1/4 to 1/7 duty factor. Twelve/nine segment output lines, 4 to 7 grid output lines, one display memory, control circuit are all incorporated into a single chip to build a highly reliable peripheral device for a single chip microcomputer. Serial data is fed to PT6955 via a three-line serial interface. Housed in a 24-pin SO Package, PT6955’s pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages.

FEATURES

  • CMOS Technology
  • Low Power Consumption
  • 8-Step Dimming Circuitry
  • Serial Interface for Clock, Data Input, Strobe Pins
  • Available in 24-pin, SO Package APPLICATION
  • Micro-computer Peripheral Device

Princeton Technology Corp. LED Driver IC PT6955 PT6955 v1.2 Page 2 Updated December 2001 Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PIN CONFIGURATION OSC DIN CLK STB VDD SG1 SG2 SG3 SG4 SG5 SG6 SG7 GND GR1 GR2 GR3 GR4 GND VDD SG12/GR5 SG11/GR6 SG10/GR7 SG9 SG8

Princeton Technology Corp. LED Driver IC PT6955 PT6955 v1.2 Page 3 Updated December 2001 Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw APPLICATION CIRCUIT OSC DIN CLK STB VDD SG1 SG2 SG3 SG4 SG5 SG6 SG7 GND GR1 GR2 GR3 GR4 GND VDD SG12/GR5 SG11/GR6 SG10/GR7 SG9 SG8 DIGIT1 DIGIT2 DIGIT3 DIGIT4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 +5V MCU 4-GRID X 12-SEGMENT +5V S5S2 S10 S12 S6S3 S7S5 0.1µF S12 S11 51K (COMMON CATHODE) Note: The capacitor (0.1uF) connected between the GND and VDD Pins must be located as near as possible to the PT6959 chip.