Ordering number : EN4828A LC75852E LC75852W http://onsemi.com CMOS LSI Asynchronous Silicon Gate 1/2 Duty LCD Driver with On-Chip Key Input Function Overview The LC75852E and LC75852W are 1/2 duty dynamic LCD display drivers. In addition to being able to directly drive LCD panels with up to 90 segments, they can also control up to four general-purpose output ports. These products also include a key scan circuit which allows them to accept input from keypads with up to 30 keys. This allows end product front panel wiring to be simplified. Features Up to 30 key inputs (Key scan is only performed when a key is pressed.) 1/2 duty – 1/2 bias (up to 90 segments) Sleep mode and the all segments off function can be controlled from serial data. Segment output port/general-purpose output port usage can be controlled from serial data. Serial data I/O supports CCB format communication with the system controller. High generality since display data is displayed directly without decoder intervention Reset pin that can establish the initial state. Specifications Absolute Maximum Ratings at Ta = 25C, VSS = 0V Parameter Symbol Maximum supply voltage Input voltage Output voltage Conditions Ratings Unit 0.3 to +7.0 V OSC, CE, CL, DI, RES, KI1 to KI5 0.3 to VDD+0.3 V OSC, DO, S1 to S45, COM1, COM2, KS1 to KS6, P1 to P4 0.3 to VDD+0.3 V 100 A VDD max VIN VDD VOUT IOUT1 S1 to S45 IOUT2 COM1, COM2, KS1 to KS6 1 IOUT3 P1 to P4 5 Allowable power dissipation Pd max Ta = 85C Operating temperature Topr 40 to +85 C Storage temperature Tstg 55 to +125 C Output current 200 mA mW Package Dimensions 17.2 14.0 12.0 64 48 0.5 10.0 [ LC75852W ] SQFP64(10X10) 33 49 32 10.0 17.2 32 49 14.0 [ LC75852E ] QIP64E(14X14) 33 64 17 17 1 1 16 0.8 0.35 16 0.5 0.15 12.0 48 0.8 unit : mm (typ) 0.18 0.15 (1.25) 0.1 0.1 3.0max 1.7max (2.7) (1.5) (1.0) CCB is ON Semiconductor® ’s original format. All addresses are managed by ON Semiconductor® for this format. CCB is a registered trademark of Semiconductor Components Industries, LLC. Semiconductor Components Industries, LLC, 2013 July, 2013 63096HA (OT)/N1594TH (OT) B8-1326, 1328 No.4828-1/16 LC75852E, 75852W Allowable Operating Ranges at Ta = –40 to +85°C, VSS = 0 V Parameter Supply voltage Input high-level voltage Input low-level voltage Symbol Conditions VDD VDD VIH1 VIH2 VIL min typ max Unit 4.5 6.0 V CE, CL, DI, RES 0.8 VDD VDD V KI1 to KI5 0.6 VDD VDD V 0 0.2 VDD V CE, CL, DI, RES, KI1 to KI5 Recommended external resistance ROSC OSC 62 kΩ Recommended external capacitance COSC OSC 680 pF Guaranteed oscillator range fOSC OSC 25 50 100 kHz Data setup time tds CL, DI: Figure 1 160 ns Data hold time tdh CL, DI: Figure 1 160 ns CE wait time tcp CE, CL: Figure 1 160 ns CE setup time tcs CE, CL: Figure 1 160 ns CE hold time tch CE, CL: Figure 1 160 ns High-level clock pulse width tøH CL: Figure 1 160 ns Low-level clock pulse width tøL CL: Figure 1 160 Rise time tr CE, CL, DI: Figure 1 160 Fall time tf CE, CL, DI: Figure 1 160 DO output delay time tdc DO, RPU = 4.7 kΩ, CL = 10 pF*: Figure 1 1.5 DO rise time tdr DO, RPU = 4.7 kΩ, CL = 10 pF*: Figure 1 1.5 RES switching time t2 Figure 2 ns ns ns 10 µs µs µs Note: * Since DO is an open-drain output, these values differ depending on the pull-up resistor RPU and the load capacitance CL. Electrical Characteristics in the Allowable Operating Ranges Parameter Symbol Conditions Hysteresis VH CE, CL, DI, RES, KI1 to KI5 Input high-level current IIH CE, CL, DI, RES: VI = 6.0 V Input low-level current IIL CE, CL, DI, RES: VI = 0 V Input floating voltage VIF KI1 to KI5 Pull-down resistance RPD KI1 to KI5: VDD = 5.0 V Output off leakage current Output high-level voltage Output low-level voltage Output middle-level voltage Current drain min typ max Unit 0.1 VDD V 5.0 –5.0 µA 0.05 VDD 50 µA 100 V 250 kΩ 6.0 µA IOFFH DO: VO = 6.0 V VOH1 KS1 to KS6: IO = –1 mA VDD – 1.0 V VOH2 P1 to P4: IO = –1 mA VDD – 1.0 V VOH3 S1 to S45: IO = –10 µA VDD – 1.0 V VOH4 COM1, COM2: IO = –100 µA VDD – 0.6 VOL1 KS1 to KS6: IO = 50 µA VOL2 V 3.0 V P1 to P4: IO = 1 mA 1.0 V VOL3 S1 to S45: IO = 10 µA 1.0 V VOL4 COM1, COM2: IO = 100 µA 0.6 V VOL5 DO: IO = 1 mA 0.5 V VMID1 COM1, COM2: VDD = 6.0 V, IO = ±100 µA 2.4 3.0 3.6 V VMID2 COM1, COM2: VDD = 4.5 V, IO = ±100 µA 1.65 2.25 2.85 V 5 µA 1.4 2.5 mA IDD1 Sleep mode, Ta = 25°C IDD2 VDD = 6.0 V, output open, Ta = 25°C, fOSC = 50 kHz 0.4 1.0 0.1 No. 4828-2/16 LC75852E, 75852W 1. When stopped with CL at the low level 2. When stopped with CL at the high level Figure 1 Pin Assignment No. 4828-3/16 LC75852E, 75852W Block Diagram Pin Functions Pin S1/P1 to S4/P4 S5 to S43 COM1 COM2 Active I/O Handling when unused Segment outputs: Used to output the display data that is transmitted over the serial data input. Pins S1/P1 to S4/P4 can be used as general-purpose outputs according to control data specification. — O Open Common driver outputs. The frame frequency fO is (fOSC/512) Hz. — O Open Pin No. 1 to 4 5 to 43 44 45 Function KS1/S44, KS2/S45, KS3 to KS6 46 47 48 to 51 Key scan outputs. When a key matrix is formed, normally a diode will be attached to the key scan timing line to prevent shorts. However, since the output transistor impedance is an unbalanced CMOS output, it will not be damaged if shorted. Pins KS1/S44 and KS2/S45 can be used as segment outputs according to control data specification. — O Open KI1 to KI5 52 to 56 Key scan inputs: Pins with a built-in pull-down resistor. H I GND Oscillator connection: Oscillator circuit can be formed by connecting the pin to a resistor and a capacitor. — I/O VDD H I — I — O Open OSC 57 CE 62 Serial data interface: Connected to the controller. Since DO is an open-drain output, it requires a pull-up resistor. CE: Chip enable CL: Synchronization clock DI: Transfer data DO: Output data GND CL 63 DI 64 DO 61 RES 59 Reset input that re-initializes the LSI internal states. During a reset, the display segments are turned off forcibly regardless of the internal display data. All internal key data is reset to low and the key scan operation is disabled. However, serial data can be input during a reset. L I GND VDD 60 Power supply connection. A supply voltage of between 4.5 and 6.0 V must be provided. — — — VSS 58 Power supply ground connection. Must be connected to GND. — — — I No. 4828-4/16 LC75852E, 75852W Serial Data Input 1. When stopped with CL at the low level 2. When stopped with CL at the high level CCB address......................[42H] D1 to D90 ...........................Display data S0, S1 ................................Sleep control data K0, K1 ................................Key scan output/segment output selection data P0, P1 ................................Segment output port/general-purpose output port selection data SC ......................................Segment on/off control data No. 4828-5/16 LC75852E, 75852W Control Data Functions 1. S0, S1 .................Sleep control data This control data switches the LSI between normal mode and sleep mode. It also sets the key scan output standby states for pins KS1 to KS6. Control data Mode Segment outputs Common outputs Oscillator S0 S1 0 0 Normal Oscillator 0 1 Sleep 1 0 1 1 Key scan standby mode output pin states KS1 KS2 KS3 KS4 KS5 KS6 Operation H H H H H H Stopped L L L L L L H Sleep Stopped L L L L L H H Sleep Stopped L H H H H H H Note: The KS1/S44 and KS2/S45 output pins are set to the key scan output state. 2. K0, K1................Key scan output/segment output selection data This control data switches the KS1/S44 and KS2/S45 output pins between the key scan output and segment output functions. Control data Output pin states KS2/S45 Maximum number of key inputs KS1 KS2 30 S44 KS2 25 S44 S45 20 K0 K1 KS1/S44 0 0 0 1 1 X X: don’t care 3. P0, P1 .................Segment output port/general-purpose output port selection data This control data switches the S1/P1 to S4/P4 output pins between the segment output port and the general-purpose output port functions. Control data Output pin states P0 P1 S1/P1 S2/P2 S3/P3 S4/P4 0 0 S1 S2 S3 S4 0 1 P1 P2 S3 S4 1 0 P1 P2 P3 S4 1 1 P1 P2 P3 P4 The table below lists the correspondence between the display data and the output pins when the general-purpose output port function is selected. Output pin Corresponding display data S1/P1 D1 S2/P2 D3 S3/P3 D5 S4/P4 D7 For example, if the output pin S4/P4 is set for use as a general-purpose output port, the output pin S4/P4 will output a high level when the display data D7 is 1. 4. SC.......................Segment on/off control data This control data controls the segment on/off states. SC Display state 0 On 1 Off No. 4828-6/16 LC75852E, 75852W Display Data and Output Pin Correspondences Output pin COM1 COM2 S1/P1 D1 D2 S2/P2 D3 D4 S3/P3 D5 D6 S4/P4 D7 D8 S5 D9 D10 S6 D11 D12 S7 D13 D14 S8 D15 D16 S9 D17 D18 S10 D19 D20 S11 D21 D22 S12 D23 D24 S13 D25 D26 S14 D27 D28 S15 D29 D30 S16 D31 D32 S17 D33 D34 S18 D35 D36 S19 D37 D38 S20 D39 D40 S21 D41 D42 S22 D43 D44 S23 D45 D46 S24 D47 D48 S25 D49 D50 S26 D51 D52 S27 D53 D54 S28 D55 D56 S29 D57 D58 S30 D59 D60 S31 D61 D62 S32 D63 D64 S33 D65 D66 S34 D67 D68 S35 D69 D70 S36 D71 D72 S37 D73 D74 S38 D75 D76 S39 D77 D78 S40 D79 D80 S41 D81 D82 S42 D83 D84 S43 D85 D86 KS1/S44 D87 D88 KS2/S45 D89 D90 For example, the output states of output pin S11 are listed in the table below. Display data Output pin state D21 D22 0 0 Segment off for both COM1 and COM2 S11 0 1 Segment on for COM2 1 0 Segment on for COM1 1 1 Segments on for both COM1 and COM2 No. 4828-7/16 LC75852E, 75852W Serial Data Output 1. When stopped with CL at the low level 2. When stopped with CL at the high level CCB address......................[43H] KD1 to KD30 ......................Key data SA ......................................Sleep acknowledge data Note: If key data is read when DO is high, the key data (KD1 to KD30) and sleep acknowledge data (SA) will be invalid. Output Data 1. KD1 to KD30.....Key data When a key matrix with up to 30 keys is formed using the KS1 to KS6 output pins and the KI1 to KI5 input pins, the key data corresponding to a given key will be 1 if that key is pressed. The table below lists that correspondence. Item KI1 KI2 KI3 KI4 KI5 KS1/S44 KD1 KD2 KD3 KD4 KD5 KS2/S45 KD6 KD7 KD8 KD9 KD10 KS3 KD11 KD12 KD13 KD14 KD15 KS4 KD16 KD17 KD18 KD19 KD20 KS5 KD21 KD22 KD23 KD24 KD25 KS6 KD26 KD27 KD28 KD29 KD30 When the output pins KS1/S44 and KS2/S45 are selected for segment output by the control data K0 and K1, the key data items KD1 to KD10 will be 0. 2. SA ......................Sleep acknowledge data This output data is set according to the state when the key was pressed. If the LSI was in sleep mode, SA will be 1, and if the LSI was in normal mode, SA will be 0. Sleep Mode When S0 or S1 in the control data is set to 1, the oscillator at the OSC pin will stop (it will restart if a key is pressed) and the segment and common outputs will all go to the low level. This reduces the LSI power dissipation. However, the S1/P1 to S4/P4 output pins can be used as general-purpose output ports even in sleep mode if selected for such use by the P0 and P1 control data bits. No. 4828-8/16 LC75852E, 75852W Key Scan Operation 1. Key Scan Timing The key scan period is 375T [s]. The key scan is performed twice to reliably determine the key on/off states, and the LSI detects key data agreement. When the key data agrees, the LSI determines that a key has been pressed, and outputs a key read request (by setting DO low) 800T [s] after the key scan started. If a key is pressed again without the key data agreeing, a key scan is performed once more. Thus key on/off operations shorter than 800T [s] cannot be detected. *1 The high or low states of these signals in sleep mode are determined by the S0 and S1 control data bits. 2. Key Scan during Normal Mode • The pins KS1 to KS6 are set high. • A key scan starts if any key is pressed, and the scan continues until all keys have been released. Multiple key presses can be recognized by determining if multiple key data bits have been set. • When a key has been pressed for 800T [s] (where T = 1/fOSC) or longer, a key data read request (DO is set to low) is output to the controller. The controller acknowledges this request and reads the key data. However, DO will go high when CE is high during a serial data transfer. • After the controller has finished reading the key data, the LSI clears the key data read request (by setting DO high) and performs another key scan. Note that since DO is an open drain output, a pull-up resistor of between 1 and 10 kΩ is required. No. 4828-9/16 LC75852E, 75852W 3. Key Scan during Sleep Mode • The pins KS1 to KS6 are set high or low according to the S0 and S1 control data bits. (See the description of the control data function for details.) • If a key for a line corresponding to one of the pins KS1 to KS6 which is high is pressed, the oscillator at the OSC pin starts and a key scan is performed. The key scan continues until all keys have been released. Multiple key presses can be recognized by determining if multiple key data bits have been set. • When a key has been pressed for 800T [s] (where T = 1/fOSC) or longer, a key data read request (DO is set to low) is output to the controller. The controller acknowledges this request and reads the key data. However, DO will go high when CE is high during a serial data transfer. • After the controller has finished reading the key data, the LSI clears the key data read request (by setting DO high) and performs another key scan. Note that since DO is an open drain output, a pull-up resistor of between 1 and 10 kΩ is required. • Key scan example in sleep mode Example: Here S0 = 0 and S1 = 1 (This is a sleep in which only KS6 is high.) Multiple Key Presses Without the insertion of additional diodes, the LC75852 supports key scan for double key presses in general, triple key presses of keys on the lines for input pins KI1 to KI5, and multiple key presses of keys on the lines for the output pins KS1 to KS6. However, if multiple key presses in excess of these limits occur, the LC75852 may recognize keys that were not pressed as having been pressed. Therefore, series diodes must be connected to each key. No. 4828-10/16 LC75852E, 75852W 1/2 Duty - 1/2 Bias LCD Drive Scheme COM1 COM2 S1 to S45 outputs for segments on COM1 side being lit S1 to S45 outputs for segments on COM2 side being lit S1 to S45 outputs for segments on COM1,COM2 sides being lit S1 to S45 outputs for segments on COM1,COM2 sides not being lit RES and the Display Controller Since the LSI internal data (D1 to D90 and the control data) is undefined when power is first applied, the output pins S1/P1 to S4/P4, S5 to S43, COM1, COM2, KS1/S44 and KS2/S45 should be held low by setting the RES pin low at the same time as power is applied. Then, meaningless displays at power on can be prevented by transferring data from the controller and setting RES high when that transfer has completed. Figure 2 No. 4828-11/16 LC75852E, 75852W Internal Block States during the Reset Period (when RES is low) 1. CLOCK GENERATOR Reset is applied and the basic clock stops. However, the state of the OSC pin (the normal or sleep state) is determined after the control data S0 and S1 has been sent. 2. COMMON DRIVER, SEGMENT DRIVER & LATCH Reset is applied and the display is turned off. However, display data can be input to the LATCH. 3. KEY SCAN Reset is applied and at the same time as the internal states are set to their initial states, the key scan operation is disabled. 4. KEY BUFFER Reset is applied and all the key data is set to the low level. 5. CCB INTERFACE, CONTROL REGISTER, SHIFT REGISTER To allow serial data transfers, reset is not applied to these circuits. Output Pin States during the Reset Period (when RES is low) Output pin State during reset S1/P1 to S4/P4 L*3 S5 to S43 L COM1, COM2 L KS1/S44, KS2/S45 L*3 KS3 to KS5 X*4 KS6 H DO H*5 X: don’t care Note: 3. These output pins are forcibly set to the segment output mode and held low. 4. Immediately following power on, these output pins are undefined until the control data S0 and S1 has been sent. 5. Since this output pin is an open-drain output, a pull-up resistor of between 1 and 10 kΩ is required. This pin is held high during the reset period even if key data is read. No. 4828-12/16 LC75852E, 75852W Sample Application Circuit Note: * Since DO is an open-drain output, a pull-up resistor is required. Select a value (between 1 and 10 kΩ) that is appropriate for the capacitance of the external wiring so that the waveforms are not distorted. Notes on Controller Display Data Transfer The LC75852 transfers the display data (D1 to D90) in two operations. To assure visual display quality, all the display data should be sent within a 30 ms or shorter period. No. 4828-13/16 LC75852E, 75852W Notes on Controller Key Data Read Techniques 1. Controller key data reading under timer control • Flowchart • Timing Chart t3 ..................Key scan execution time (800T [s]) when the key scan data for two key scans agrees t4 ..................Key scan execution time (1600T [s]) when the key scan data for two key scans does not agree and a key scan is executed again t5 ..................Key address (43H) transfer time t6 ..................Key data read time 1 T= fOSC • Description When determining key on/off and reading key data, the controller must confirm the state of DO output when CE is low for each period t7. When DO is low, the controller recognizes that a key has been pressed and reads the key data. During this operation t7 must obey the following condition: t7 > t5 + t6 + t4 If key data is read when DO is high, the key data (KD1 to KD30) and the sleep acknowledge data (SA) will be invalid. No. 4828-14/16 LC75852E, 75852W 2. Controller key data reading under interrupt control • Flowchart • Timing Chart t3 ..................Key scan execution time (800T [s]) when the key scan data for two key scans agrees t4 ..................Key scan execution time (1600T [s]) when the key scan data for two key scans does not agree and a key scan is executed again t5 ..................Key address (43H) transfer time t6 ..................Key data read time 1 T= fOSC No. 4828-15/16 LC75852E, 75852W • Description When determining key on/off and reading key data, the controller must confirm the state of DO output when CE is low. When DO is low, the controller recognizes that a key has been pressed and reads the key data. After the time t8, the next key on/off determination and reading key data must be confirmed by the state of DO output when CE is low. During this operation t8 must obey the following condition : t8 > t4 If key data is read when DO is high, the key data (KD1 to KD30) and the sleep acknowledge data (SA) will be invalid. ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without further notice to any products herein. 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