Marantz ER2500 Service Manual download pdf (Page 26)

IC95: LC75725

Pin Functions

Pin Pin No. Function I/O Handling when unused

1, 13 Driver block power supply connection. (Both pins must be connected.) — —

60 Logic block power supply connection. Provide a voltage between 4.5 and 5.5 V. — —

57 Power supply connection. Connect to the ground. — —

OSCI 59

Oscillator connection. An oscillator circuit is formed by connecting an external resistor

I GND

OSCO 58

and capacitor to these pins.

O OPEN

Display off control input.

BLK 61

BLK = Low (V

) ... Display off. (S1 to S43 and G1 to G11 at V

level.)

I GND

BLK = High (V

) ... Display on.

Note that serial data can be transferred while the display is turned off.

CL 63

DI 64 I GND

CE 62

G1 to G11 2 to 12 Digit outputs. These pins are P-channel open drain outputs with pull-down resistors. O OPEN

S1 to S43 56 to 14

Segment outputs for displaying the display data transferred by serial data input. These pins

O OPEN

are P-channel open drain outputs with pull-down resistors.

Serial data transfer inputs. These pins must be connected to the system microcontroller.

CL: Synchronization clock

DI: Transfer data

CE: Chip enable

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 67 68

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Marantz ER2500 Service Manual Page 26