Harman Kardon DPR 1001 Service Manual

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Contents

Harman Kardon DPR 1001 Service Manual Manual pdf 116 page image

Block DiagramLC75725EPin FunctionsPin Pin No. Function I/O Handling when unusedV FL 1, 13 Driver block power supply connection. (Both pins must be connected.) — —VDD 60 Logic block power supply connection. Provide a voltage between 4.5 and 5.5 V. — —VSS 57 Power supply connection. Connect to the ground. — —OSCI 59 Oscillator connection. An oscillator circuit is formed by connecting an external resistor I GNDOSCO 58 and capacitor to these pins. O OPENDisplay off control input.BLK 61 BLK = Low (VSS ) ... Display off. (S1 to S43 and G1 to G11 at VFL level.) I GNDBLK = High (VDD ) ... Display on.Note that serial data can be transferred while the display is turned off.CL 63DI 64 I GNDCE 62G1 to G11 2 to 12 Digit outputs. These pins are P-channel open drain outputs with pull-down resistors. O OPENS1 to S43 56 to 14 Segment outputs for displaying the display data transferred by serial data input. These pins O OPENare P-channel open drain outputs with pull-down resistors.Serial data transfer inputs. These pins must be connected to the system microcontroller.CL: Synchronization clockDI: Transfer dataCE: Chip enable116DPR1001 harman/kardon