ST7565 - Topwaydisplay.com

ST7565• The Relationship Between Oscillator Frequency fOSC, Display Clock Frequency fCL and the Liquid Crystal FrameRate Frequency fFRTable 23Item fCL fFR1/65 DUTY1/49 DUTY1/33 DUTY1/55 DUTYUsed internal oscillator circuit fOSC / 4 fOSC / (4*65)Used external display clock External input (fCL) fCL / 260Used internal oscillator circuit fOSC / 4 fOSC / (4*49)Used external display clock External input (fCL) fCL / 196Used internal oscillator circuit fOSC / 8 fOSC / (8*33)Used external display clock External input (fCL) fCL / 264Used internal oscillator circuit fOSC / 4 fOSC / (4*55)Used external display clock External input (fCL) fCL / 2201/53 DUTYUsed internal oscillator circuit fOSC / 4 fOSC / (4*53)Used external display clock External input (fCL) fCL / 212(fFR is the liquid crystal alternating current period, and not the FR signal period.)References for items market with **1 While a broad range of operating voltages is guaranteed, performance cannot be guaranteed if there are suddenfluctuations to the voltage while the MPU is being accessed.*2 The operating voltage range for the VDD system and the V5 system is. This applies when the external power supply isbeing used.*3 The A0, D0 to D5, D6 (SCL), D7 (SI), RD (E), WR (R/W), CS1, CS2, CLS, CL, FR, M/S, C86, P/S, DOF, RES, IRS, and HPMterminals.*4 The D0 to D7, FR, FRS, DOF, and CL terminals.*5 The A0, RD (E), WR (R/W), CS1, CS2, CLS, M/S, C86, P/S, RES, IRS, and HPM terminals.*6 Applies when the D0 to D5, D6 (SCL), D7 (SI), CL, FR, and DOF terminals are in a high impedance state.*7 These are the resistance values for when a 0.1 V voltage is applied between the output terminal SEGn or COMn and thevarious power supply terminals (V1, V2, V3, and V4). These are specified for the operating voltage (3) range.RON = 0.1 V /ΔI (Where ΔI is the current that flows when 0.1 V is applied while the power supply is ON.)*8 See Table 23 for the relationship between the oscillator frequency and the frame rate frequency.*9 The V5 voltage regulator circuit regulates within the operating voltage range of the voltage follower.*10 This is the internal voltage reference supply for the V5 voltage regulator circuit. In the ST7565-0A , the temperature rangeapproximately –0.15%/°C.*11, 12 It indicates the current consumed on ICs alone when the internal oscillator circuit and display are turned on.The ST7565 is 1/9 biased. Does not include the current due to the LCD panel capacity and wiring capacity.Applicable only when there is no access from the MPU.*12 It is the value on a ST7565-0A having the VREG temperature gradient is –0.15%/°C when the V5 voltage regulatorinternal resistor is used.Ver 0.9 49/49 2001/01/11