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¡ Semiconductor ML9203-xx 5/30 PIN DESCRIPTION 1 to 15, 81 to 100 Pin Type Connects to VFD tube anode electrode drive output. Directly connected to fluorescent display tube and a pull-down resistor is not necessary. IOH>–5 mA Description Symbol VFD tube anode electrode SEGA1 to A35 O VFD tube grid electrode drive output. Directly connected to fluorescent display tube and a pull-down resistor is not necessary. IOH>–50 mA VFD tube grid electrode COM1 to 16 O 53 to 60 71 to 78 VFD tube anode electrode drive output. Directly connected to fluorescent display tube and a pull-down resistor is not necessary. IOH>–20 mA VFD tube anode electrode ADA, ADB O 52, 79 VDD 69 L-GND 62 VDISP 51, 80 — Power supply VDD-L-GND are power supplies for internal logic. VDISP-D-GND are power supplies for driving fluorescent tubes. Apply VDISP after VDD is applied. Use the same power supply for L-GND and D-GND. Serial data input (positive logic). Input from LSB. Micro- controller DA I 68 Shift clock input. Serial data is shifted on the rising edge of CP. Micro- controller CP I 67 Chip select input. Serial data transfer is disabled when CS pin is "H" level. Micro- controller CS I 66 Reset input. "Low" initializes all the functions. Initial status is as follows. • Address of each RAM • Data of each RAM • Display digit • Brightness adjusment • All lights ON or OFF For a circuit when R and C are connected externally, see Application Circuit. address "00"H Content is undefined 16 digits 0/1024 OFF mode RESET I 65 Micro- controller or C, R Pins for oscillation. Connect crystal and capacitors or ceralock resonator and capacitors. (Use a built-in feedback resistor.) Set the target oscillation frequency to 4 MHz. For an external circuit, see APPLICATION CIRCUIT. OSC0 I 63 OSC1 O 64 Crystal or ceralock resonator 16 to 50 SEGB1 to B35 D-GND 61, 70 |
