ST7920 - Topwaydisplay.com
ST7920 - Topwaydisplay.com
ST7920 - Topwaydisplay.com
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<strong>ST7920</strong>Pin descriptionName No. I/O Connects to DescriptionCAP3MCAP1PCAP1MCAP2M34353638I/O Capacitors Capacitor pins for voltage doublerXOFF 32 O ― Reserved (no connection)CAP2P 37 ― ― Reserved (no connection)VD2 39 I Reference voltage Voltage doubler reference voltageN.C.N.C.N.C.456I―――Test pins (no connection)Note:1. VDD>=V0>=V1>=V2>=V3>=V4 must be maintained2. Two clock options:3.When using voltage doubler for VOUT it is re<strong>com</strong>mended that the total sum of bleeder resistors R1~R5 should be larger than 20K OhmR=33K (VDD=5.0V)R=18K (VDD=2.7V)OSC1 OSC2 OSC1 OSC2RClockexternal resistor & current (VDD=5V)external resistor & Frequency (VDD=5V)Iss (uA)8007006005004003002001000Frequency(KHz)90080070060050040030020010005152540608010015254060801005Resistor(K)Resistor(K)V3.1 8/42 2003/04/11
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