Pioneer VSX 108 Service Manual - Page 32

VSX-108 00202879-040 (BU2879AK) (DISPLAY PCB : IC702) • FL Driver IC for VTR • Block Diagram CS SCK SI SO VSS 9865 7 8 bit Shift-Reg. OSC VDD 44 38 OSC 1-4 SW1 - SW4 4 4 bit Data 10 - 13 K1 - K4 4 KEY Data Latch (4 × 6) 16 bit Latch 16 bit × 15 word Display Data RAM Control Logic Grid Driver 10 G10 - G1 32 - 37, 39 - 42 SEGMENT Driver • Pin Function No. Name I/O 11 15 - 25 S1 -S11 Function 1 SW1 2 SW2 3 SW3 4 SW4 I General-purpose input Input data is able to transfer to the microcomputer with serial 5 SO O Serial data output from upper bit Output is N ch open-drain S/G Driver 5 26, 28 - 31 38 S12/G15 - S16/G11 VEE No. Name I/O Function 23 S9 24 S10 25 S11 O Output for segment Output is P ch open-drain and pull-down resistor 26 S12/G15 O Output for segment and grid Output is P ch open-drain and pull-down resistor 27 VEE I Power supply pin 2 Connect a pull-down resistor of FLD driver ouput 6 SI 7 VSS 8 SCK 9 CS 10 K1 11 K2 12 K3 13 K4 14 VDD 15 S1 16 S2 17 S3 18 S4 19 S5 20 S6 21 S7 22 S8 32 I Serial data input from upper bit 28 S13/G14 − Connect to system GND I Serial clock input at rising edge 29 S14/G13 30 S15/G12 O Output for segment and grid Output is P ch open-drain and pull-down resistor I Serial chip select L: serial initialize, H: effective 31 S16/G11 32 G10 I Key scan data input 33 G9 34 G8 35 G7 I Power supply pin 1 Connect to system power 36 G6 37 G5 38 VDD O Output for segment Output is P ch open-drain and pull-down resistor 39 G4 40 G3 41 G2 42 G1 43 VSS 44 OSC O Output for grid Output is P ch open-drain and pull-down resistor I Power supply pin 1 Connect to system power O Output for grid Output is P ch open-drain and pull-down resistor I Connect to system GND I/O Connect a capacitor for oscillation