PT16518 1/3, 1/4 Duty LCD Display Drivers with Key Input Function DESCRIPTION The PT16518 is the 1/4 duty and 1/3 duty general-purpose microprocessor-controlled LCD driver that can be used in applications such as frequency display in products with electronic tuning. In addition to being able to drive up to 276 segments directly, the PT16518 can also control up to 8 general-purpose output ports. Because it has the PWM output of a maximum of 6 ch, the brightness control of the LED backlight of RGB can be done. Incorporation of an oscillation circuit helps to reduce the number of external resistors and capacitors required. This product also incorporates a key scan circuit that accepts input from up to 30 keys to reduce printed circuit board wiring. FEATURES Switching between 1/2 bias and 1/3 bias drive techniques under serial data control. When 1/4-duty: Capable of driving up to 276 segments When 1/3-duty: Capable of driving up to 210 segments Serial data input supports SERIAL INTERFACE format communication with the system controller (Support 3.3V and 5V operation). Serial data control of the power-saving mode based backup function and the all segments forced off function. Serial data control of switching between the segment output port and general-purpose output port function.(Support for up to 8 general-purpose output ports) Support for the PWM output function of a maximum of 6 ch (It can output from the general-purpose output port). Support for clock output function of 1ch (It can output from the general-purpose output port). Serial data control of the frame frequency of the common and segment output waveforms. Serial data control of switching between the internal oscillator operating mode and external clock operating mode. High generality, since display data is displayed directly without the intervention of a decoder circuit. Built-in display contrast adjustment circuit. The INH pin allows the display to be forced to the off state. Incorporation of an oscillator circuit (Incorporation of resistor and capacitor for an oscillation). Key input function for up to 30 keys (A key scan is performed only when a key is pressed.) APPLICATION Car Audio Set-Top Box Electronic Equipment with LCD Display. Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan PT16518 BLOCK DIAGRAM V1.0 2 August 2014 PT16518 CONTENTS 1. 2. 3. 4. 5. 6. APPLICATION CIRCUIT .............................................................................................................................................. 4 ORDER INFORMATION............................................................................................................................................... 5 PIN CONFIGURATION................................................................................................................................................. 5 PIN DESCRIPTION ...................................................................................................................................................... 6 INPUT/OUPUT CONFIGURATIONS ............................................................................................................................ 7 FUNCTION DESCRIPTION ......................................................................................................................................... 8 6.1 SERIAL DATA INPUT ............................................................................................................................................ 8 6.2 SERIAL DATA TRANSFER EXAMPLE ............................................................................................................... 12 6.3 CONTROL DATA FUNCTIONS .......................................................................................................................... 13 6.4 DISPLAY DATA TO SEGMENT OUTPUT PIN CORRESPONDENCE .............................................................. 20 6.5 SERIAL DATA OUTPUT ..................................................................................................................................... 24 6.6 OUTPUT DATA ................................................................................................................................................... 25 6.7 SLEEP MODE FUNCTIONS ............................................................................................................................... 25 6.8 KEY SCAN OPERATION FUNCTIONS.............................................................................................................. 26 6.9 MULTIPLE KEY PRESSES ................................................................................................................................ 28 6.10 OUTPUT WAVEFORMS (1/4-DUTY 1/2-BIAS DRIVE SCHEME) .................................................................... 29 6.11 1/4-DUTY, 1/2-BIAS DRIVE TECHNIQUE ........................................................................................................ 31 6.12 OUTPUT WAVEFORMS (1/3-DUTY 1/3-BIAS DRIVE SCHEME) ................................................................... 32 6.13 PWM OUTPUT PORT WAVEFORMS ............................................................................................................. 34 6.14 DISPLAY CONTROL AND THE /INH PIN ........................................................................................................ 36 6.15 NOTES ON THE CONTROLLER KEY DATA READ TECHNIQUES .............................................................. 37 6.16 NOTES ON CONTROLLER TRANSFER OF DISPLAY DATA ........................................................................ 39 6.17 S69/OSCI PIN PERIPHERAL CIRCUIT ........................................................................................................... 39 6.18 P1 TO P6 PIN PERIPHERAL CIRCUIT ........................................................................................................... 39 7. ABSOLUTE MAXIMUM RATINGS ............................................................................................................................. 40 8. ALLOWABLE OPERATING RANGES ....................................................................................................................... 40 9. ELECTRICAL CHARACTERISTICS .......................................................................................................................... 41 10.PACKAGE INFORMATION ........................................................................................................................................ 43 IMPORTANT NOTICE ..................................................................................................................................................... 44 V1.0 3 August 2014 PT16518 1. APPLICATION CIRCUIT Notes: 1. Add a capacitor to the logic block power supply line so that the logic block power supply voltage V DD rise time when power is applied and the logic block power supply voltage VDD fall time when power drops are both at least 1ms, as the PT16518 is reset by the VDET. 2. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 and 10KΩ) appropriate for the capacitance of the external wiring so that signal waveforms are not degraded. V1.0 4 August 2014 PT16518 2. ORDER INFORMATION Valid Part Number Package Type Top Code PT16518-LQ 80-PIN, LQFP PT16518-LQ 3. PIN CONFIGURATION V1.0 5 August 2014 PT16518 4. PIN DESCRIPTION Pin Name PW3/P3/S3 to PW6/P6/S6 P7/S7, P8/S8 S9 to S55 S68,S70 PW1/P1/S1, PW2/P2/S2 KI1/S62, KI2/S63, KI3/S64, KI4/S65, KI5/S66 I/O Active Handling when unused Function Pin No. O - Open Segment outputs for displaying the display data transferred by serial data input. The S1/P1 to S8/P8 pins can be used as general-purpose output ports under serial data control. 1 to 4 5, 6 7 to 53 69 71 79, 80 I H GND Key scan inputs. These pins have built-in pull-down resistors. 60 to 64 Key scan outputs. Although key scan timing lines require diodes to be inserted in the timing lines to prevent shorts, since these outputs are unbalanced CMOS transistor outputs, these outputs will not be damaged by shorting when these outputs are used to form a key matrix. The KS1/S56 and KS6/S61 pins can be used as segment outputs when so specified by the control data. Common driver outputs The frame frequency is fo[Hz]. The COM4/S67 pin can be used as a segment output in 1/3 duty. Power Supply Pin A Ground pin. Must be connected to ground. Segment output. This pin can also be used as the external clock input pin when the external clock operating mode is selected by control data. Display off control input /INH=Low (VSS)…Display forced off S1/P1 to S8/P8=Low (VSS) (These pins are forcibly set to the general-purpose output port function and held at the VSS level.) S9 to S70=low(VSS) COM1 to COM3=low(VSS) COM4/S67=low(VSS) OSCI=low(VSS) (This pin is forcibly set to the segment output port function and held at the VSS level.) Stops the internal oscillator. Inhibits external clock input. /INH=High (VDD)…Display on Enables the internal oscillator circuit. (Internal oscillator operating mode) Enables external clock input. (External clock operating mode) Display contrast adjustment circuit operation is enabled. However, serial data transfer is possible when the display is forced off. KS1/S56, KS2/S57, KS3/S58, KS4/S59, KS5/S60, KS6/S61 O - Open COM1 to COM3 COM4/S67 O - Open VDD VSS - - - S69/OSCI I/O - Open /INH I L GND DO O - Open Output Data 72 CE I H 76 CL I GND DI I Serial data transfer inputs. Must be connected to the controller. CE: Chip enable CL: Synchronization clock DI: Transfer data V1.0 - 6 54 to 59 65 to 68 70 73 74 75 77 78 August 2014 PT16518 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 44 August 2014