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| Princeton Technology Corp. LED Driver IC DESCRIPTION Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT6958 PT6958 is an LED Controller driven on a 1/6 duty factor. Ten segment output lines, 5 grid output lines, one display memory, control circuit, key scan 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 PT6958 via a three-line serial interface. Housed in a 28-pin SO Package, PT6958's pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages. FEATURES * CMOS Technology * Low Power Consumption * Key Scanning (6 x 4 matrix) * 8-Step Dimming Circuitry * Serial Interface for Clock, Data Input, Data Output, Strobe Pins * Available in 28-pin, SO Package APPLICATION * Micro-computer Peripheral Device PT6958 v1.1 1 Updated Nov. 2000 Princeton Technology Corp. LED Driver IC PIN CONFIGURATION OSC DOUT DIN CLK STB K1 K2 K3 K4 VDD SG1/KS1 SG2/KS2 SG3/KS3 SG4/KS4 Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT6958 GND GR1 GR2 GR3 GR4 GR5 GND VDD SG10 SG9 SG8 SG7 SG6/KS6 SG5/KS5 PIN DESCRIPTION Pin N ame I/O Description O scillator Input Pin A resistor is connected to this pin to determine the oscillation frequency Data O utput Pin (N - C hannel, O pen- Drain) This pin outputs serial data at the falling edge of the shift clock. Data Input Pin This pin inputs serial data at the rising edge of the shift clock (starting from the lower bit) C lock Input Pin This pin reads serial data at the rising edge and outputs data at the falling edge. Serial Interface Strobe Pin The data input after the STB has fallen is processed as a command. When this pin is "HIGH", C LK is ignored. K ey Data Input Pins The data sent to these pins are latched at the end of the display cycle. (Internal Pull- Low Resistor) Ground Pin Segment O utput Pins (p- channel, open drain) Also acts as the K ey Source Segment O utput Pins (p- channel, open drain) Power Supply Grid O utput Pins (n- channel, open drain) 2 Pin N o. O SC I 1 DO UT O 2 DIN I 3 C LK I 4 STB I 5 K 1 to K 4 GN D SG1/K S1 to SG6/K S6 SG7 to SG10 VDD GR5 to GR1 PT6958 v1.1 I O O O 6~ 9 2 2 , 28 11~ 16 17~ 20 10,21 23~ 2 7 Updated Nov. 2000 Princeton Technology Corp. LED Driver IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT6958 APPLICATION CIRCUIT G1 51K MCU 10K +5V +5V S1 S2 S3 S4 OSC DOUT DIN CLK STB K1 K2 K3 K4 VDD SG1/KS1 SG2/KS2 SG3/KS3 SG4/KS4 GND GR1 GR2 GR3 GR4 GR5 GND VDD SG10 SG9 SG8 SG7 SG6/KS6 SG5/KS5 G1 G2 G3 G4 +5V S10 S9 S8 S7 S6 S5 G2 G3 G4 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 DIGIT1 DIGIT2 DIGIT3 DIGIT4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 4-GRID X 10-SEGMENT LED (COMMON CATHODE) S1 S2 SW5 SW6 SW7 SW8 1N4148 SW1 SW2 SW3 SW4 PT6958 v1.1 3 Updated Nov. 2000 |
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