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ML9209 Datasheet(PDF) 4 Page - OKI electronic componets |
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ML9209 Datasheet(HTML) 4 Page - OKI electronic componets |
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FEDL9209-01 OKI Semiconductor ML9209-xx 4/29 PIN DESCRIPTION Pin Symbol Type Connects to Description 28–38, 40–44 SEG1–16 O VFD tube anode electrode VFD tube anode electrode drive output. Directly connected to the VFD tube and no pull-down resistor is required. IOH > –6 mA 1–16 COM1–16 O VFD tube grid electrode VFD tube grid electrode drive output. Directly connected to the VFD tube and no pull-down resistor is required. IOH > –30 mA 26, 27 AD1–2 O VFD tube anode electrode VFD tube anode electrode drive output. Directly connected to the VFD tube and no pull-down resistor is required. IOH > –15 mA 18, 25 VDD 20 GND 17,39 VFL — Power supply The voltage supply between VDD and GND is for the power supply for the internal logic. The voltage supply between VDD and VFL is for the power supply for driving the VFD tube. Apply power to VDD first, then to VFL. 24 DA I Microcontroller Serial data input pin (positive logic). Data is input from the LSB. 23 CP I Microcontroller Shift clock input pin. Serial data is shifted in on a rising edge of CP. 22 CS I Microcontroller Chip select input pin. Serial data transfer is disabled when CS pin is “H” level. 21 RESET l Microcontroller Reset input. Setting this pin to “Low” initializes all the functions. Initial status is as follows. • Address of each RAM.............. Address “00”H • Data of each RAM ................... Content is undefined • Display digit ............................ 16 digits • Brightness adjustment............. 0/16 • All display lights ON or OFF .... OFF mode • All outputs............................... Low level Pin for RC oscillation. Resistors and capacitors are connected externally and constants vary depending on the VDD voltage used. The target oscillation frequency is 2MHz. 19 OSC0 I/O C1, R1 OSC0 R1 C1 (RC oscillator circuit) *Refer to the Application Circuit. |
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