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Ordering number : EN6086
CMOS IC
LC75884E, LC75884W
1/4 Duty LCD Display Drivers with Key Input Function
Overview
The LC75884E and LC75884W are 1/4 duty LCD display drivers that can directly drive up to 220 segments and can control up to four general-purpose output ports. These products also incorporate a key scan circuit that accepts input from up to 30 keys to reduce printed circuit board wiring.
Package Dimensions
unit: mm QFP80E
[LC75884E]
23.2 20.0 1.0
0.8 64 65 0.8 0.35 41 40
1.6 0.15
* Key input function for up to 30 keys (A key scan is performed only when a key is pressed.) * 1/4duty - 1/2bias and 1/4duty - 1/3bias drive schemes can be controlled from serial data (up to 220 segments). * Sleep mode and all segments off functions that are controlled from serial data. * Segment output port/general-purpose output port function switching that is controlled from serial data. * Serial data I/O supports CCB format communication with the system controller. * Direct display of display data without the use of a decoder provides high generality. * Independent VLCD for the LCD driver block (VLCD can be set to in the range VDD-0.5 to 6.0 volts.) * Provision of an on-chip voltage-detection type reset circuit prevents incorrect displays. * RES pin provided for forcibly initializing the IC internal circuits. * RC oscillator circuit.
17.2 14.0
0.8
Features
1.6
80 1 24
25
3.0max
2.7
21.6
0.8
SANYO: QFP80E(QIP80E)
unit: mm SQFP80
[LC75884W]
1.25 60 61 1.25 14.0 12.0 0.5 0.135 1.25 41 40
1.25
14.0 12.0 0.5
80 1 0.2 20
21 1.6max 1.4
* CCB is a trademark of SANYO ELECTRIC CO., LTD. * CCB is SANYO's original bus format and all the bus addresses are controlled by SANYO.
0.5
0.5
0.1
SANYO: SQFP80
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
22299RM (OT) No. 6086-1/27
0.8
15.6
LC75884E, LC75884W
Specifications
Absolute Maximum Ratings at Ta=25C, VSS=0V
Parameter Maximum supply voltage Symbol VDD max VLCD max VIN1 Input voltage VIN2 VIN3 VOUT1 Output voltage VOUT2 VOUT3 IOUT1 Output current IOUT2 IOUT3 IOUT4 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg VDD VLCD CE, CL, DI, RES OSC,TEST VLCD1, VLCD2, KI1 to KI5 DO OSC S1 to S55, COM1 to COM4, KS1 to KS6, P1 to P4 S1 to S55 COM1 to COM4 KS1 to KS6 P1 to P4 Ta = 85C Conditions Ratings -0.3 to +7.0 -0.3 to +7.0 -0.3 to +7.0 -0.3 to VDD +0.3 -0.3 to VLCD +0.3 -0.3 to +7.0 -0.3 to VDD +0.3 -0.3 to VLCD +0.3 300 3 1 5 200 -40 to +85 -55 to +125 mW C C mA A V V Unit V
Allowable Operating Ranges at Ta = -40 to +85C, VSS=0V
Parameter Symbol VDD VLCD VLCD1 VLCD2 VIH1 VIH2 VIL ROSC COSC fOSC tds tdh tcp tcs tch toH toL tr tf tdc tdr VDD VLCD VLCD1 VLCD2 CE, CL, DI, RES KI1 to KI5 CE, CL, DI, RES, KI1 to KI5 OSC OSC OSC CL, DI CL, DI CE, CL CE, CL CE, CL CL CL CE, CL, DI CE, CL, DI DO RPU=4.7k, CL=10pF *1 DO RPU=4.7k, CL=10pF *1 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 :Figure 2 25 160 160 160 160 160 160 160 160 160 1.5 1.5 0.8 VDD 0.6 VDD 0 43 680 50 100 Conditions Ratings min 4.5 VDD - 0.5 2/3 VLCD 1/3 VLCD typ max 6.0 6.0 VLCD VLCD 6.0 VLCD 0.2 VDD Unit
Supply voltage
V
Input voltage
V
Input high level voltage Input low level voltage Recommended external resistance Recommended external capacitance Guaranteed oscillator range Data setup time Data hold time CE wait time CE setup time CE hold time High level clock pulse width Low level clock pulse width Rise time Fall time DO output delay time DO rise time
V V k pF kHz ns ns ns ns ns ns ns ns ns s s
Note: *1. Since DO is an open-drain output, these values depend on the resistance of the pull-up resistor RPU and the load capacitance CL.
No. 6086-2/27
LC75884E, LC75884W Electrical Characteristics for the Allowable Operating Ranges
Parameter Hysteresis Power-down detection voltage Input high level current Input low level current Input floating voltage Pull-down resistance Output off leakage current Symbol VH VDET IIH IIL VIF RPD IOFFH VOH1 Output high level voltage VOH2 VOH3 VOH4 VOL1 VOL2 Output low level voltage VOL3 VOL4 VOL5 VMID1 VMID2 Output middle level voltage *2 VMID3 VMID4 VMID5 Oscillator frequency fosc IDD1 IDD2 ILCD1 Current drain ILCD2 ILCD3 CE, CL, DI, RES: VI = 6.0V CE, CL, DI, RES: VI = 0V KI1 to KI5 KI1 to KI5: VDD = 5.0V DO: VO = 6.0V KS1 to KS6: IO = -500A P1 to P4: IO = -1mA S1 to S55: IO = -20A COM1 to COM4: IO = -100A KS1 to KS6: IO = 25A P1 to P4: IO = 1mA S1 to S55: IO = 20A COM1 to COM4: IO = 100A DO: IO = 1mA COM1 to COM4: 1/2bias, IO = 100A S1 to S55: 1/3bias,IO = 20A S1 to S55: 1/3bias, IO = 20A COM1 to COM4: 1/3bias,IO = 100A COM1 to COM4: 1/3bias,IO = 100A OSC: ROSC = 43k, COSC = 680pF VDD :Sleep mode VDD: VDD = 6.0V, output open,fosc = 50kHz VLCD : Sleep mode VLCD: VLCD = 6.0V, output open, 1/2bias, fosc = 50kHz VLCD: VLCD = 6.0V, output open, 1/3bias, fosc = 50kHz 200 120 270 1/2VLCD - 1.0 2/3VLCD - 1.0 1/3VLCD - 1.0 2/3VLCD - 1.0 1/3VLCD - 1.0 40 50 0.1 50 100 -5.0 0.05 VDD 250 6.0 VLCD - 1.0 VLCD - 0.5 VLCD - 0.2 VLCD - 1.0 VLCD - 1.0 VLCD - 1.0 0.2 0.5 1.5 1.0 1.0 1.0 0.5 1/2VLCD + 1.0 2/3VLCD + 1.0 1/3VLCD + 1.0 2/3VLCD + 1.0 1/3VLCD + 1.0 60 100 540 5 A 400 240 kHz V V V Conditions CE, CL, DI, RES, KI1 to KI5 2.5 Ratings min typ 0.1 VDD 3.0 3.5 5.0 max Unit V V A A V k A
Nete: *2. Excluding the bias voltage generation divider resistor built into VLCD1 and VLCD2. (See Figure 1.)
No. 6086-3/27
LC75884E, LC75884W
Figure 1
1. When CL is stopped at the low level
2. When CL is stopped at the high level
Figure 2
No. 6086-4/27
LC75884E, LC75884W Pin Assignment
No. 6086-5/27
LC75884E, LC75884W Block Diagram
No. 6086-6/27
LC75884E, LC75884W Pin Functions
Pin S1/P1 S2/P2 S3/P3 S4/P4 S5 to S53 COM1 COM2 COM3 COM4 Pin No. LC75884E 1 2 3 4 5 to 53 54 55 56 57 LC75884W 79 80 1 2 3 to 51 52 53 54 55 Function Segment outputs for displaying the display data transferred by serial data input. The S1/P1 to S4/P4 pins can be used as general-purpose output ports under serial data control. Active I/O Handling when unused
--
q
OPEN
Common driver outputs The frame frequency fo is given by : fo = (fOSC/512)Hz.
--
q
OPEN
KS1/S54 KS2/S55 KS3 to KS6
58 59 60 to 63
56 57 58 to 61
Key scan outputs Although normal 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/S54 and KS2/S55 pins can be used as segment outputs when so specified by the control data. Key scan inputs These pins have built-in pull-down resistors. Oscillator connection An oscillator circuit is formed by connecting an external resistor and capacitor at this pin. Serial data interface connections to the controller. Note that DO, being an open-drain output, requires a pull-up resistor. CE :Chip enable CL :Synchronization clock DI :Transfer data DO :Output data Reset signal input RES=low **** Display off Key scan disabled All key data is reset to low RES=high *** Display on Key scan enabled However, serial data can be transferred when RES is low. This pin must be connected to ground. Used for applying the LCD drive 2/3 bias voltage externally. Must be connected to VLCD2 when a 1/2 bias drive scheme is used. Used for applying the LCD drive 1/3 bias voltage externally. Must be connected to VLCD1 when a 1/2 bias drive scheme is used. Logic block power supply connection. Provide a voltage of between 4.5 and 6.0V. LCD driver block power supply connection. Provide a voltage of between VDD-0.5 and 6.0V. Power supply connection. Connect to ground.
--
O
OPEN
KI1 to KI5
64 to 68
62 to 66
H
I
GND
OSC
75
73
--
I/O
VDD
CE CL DI DO
78 79 80 77
76 77 78 75
H v -- --
I I I O OPEN GND
RES
76
74
L
I
VDD
TEST VLCD1 VLCD2 VDD VLCD VSS
74 71
72 69
-- --
I I
-- OPEN
72
70
--
I
OPEN
69
67
--
--
--
70 73
68 71
-- --
-- --
-- --
No. 6086-7/27
LC75884E, LC75884W Serial Data Input 1. When CL is stopped at the low level
Note: B0 to B3,A0 to A3 ........ CCB address DD ................................ Direction data
No. 6086-8/27
LC75884E, LC75884W 2. When CL is stopped at the high level
Note: B0 to B3,A0 to A3 ........ CCB address DD ................................ Direction data CCB address ........ 42H D1 to D220 ............ Display data S0,S1 .................... Sleep control data K0,K1 .................... Key scan output/segment output selection data P0 to P2 ................ Segment output port/general-purpose output port selection data SC ........................ Segment on/off control data DR ........................ 1/2 bias or 1/3 bias drive selection data
No. 6086-9/27
LC75884E, LC75884W Control Data Functions 1. S0, S1 : Sleep control data These control data bits switch between normal mode and sleep mode and set the states of the KS1 to KS6 key scan outputs during key scan standby.
Control data S0 0 0 1 1 S1 0 1 0 1 Mode Normal Sleep Sleep Sleep OSC oscillator Operating Stopped Stopped Stopped Segment outputs Common outputs Operating L L L Output pin states during key scan standby KS1 H L L H KS2 H L L H KS3 H L L H KS4 H L L H KS5 H L H H KS6 H H H H
Note: This assumes that the KS1/S54 and KS2/S55 output pins are selected for key scan output.
2. K0, K1 : Key scan output /segment output selection data These control data bits switch the functions of the KS1/S54 and KS2/S55 output pins between key scan output and segment output.
Control data K0 0 0 1 K1 0 1 X Output pin state KS1/S54 KS1 S54 S54 KS2/S55 KS2 KS2 S55 Maximum number of input keys 30 25 20
X: don't care Note: KSn(n=1 or 2) : Key scan output Sn (n=54 or 55): Segment output
3. P0 to P2 : Segment output port/general-purpose output port selection data These control data bits switch the functions of the S1/P1 to S4/P4 output pins between the segment output port and the general-purpose output port.
Control data P0 0 0 0 0 1 P1 0 0 1 1 0 P2 0 1 0 1 0 S1/P1 S1 P1 P1 P1 P1 Output pin state S2/P2 S2 S2 P2 P2 P2 S3/P3 S3 S3 S3 P3 P3 S4/P4 S4 S4 S4 S4 P4
Note: Sn(n=1 to 4): Segment output port Pn(n=1 to 4): General-purpose output port The table below lists the correspondence between the display data and the output pins when these pins are selected to be general-purpose output ports.
Output pin S1/P1 S2/P2 S3/P3 S4/P4
Corresponding display data D1 D5 D9 D13
For example, if the S4/P4 output pin is selected to be a general-purpose output port, the S4/P4 output pin will output a high level (VLCD) when the display data D13 is 1, and will output a low level (Vss) when D13 is 0.
No. 6086-10/27
LC75884E, LC75884W 4. SC : Segment on/off control data This control data bit controls the on/off state of the segments.
SC 0 1 Display state on off
However, note that when the segments are turned off by setting SC to 1, the segments are turned off by outputting segment off waveforms from the segment output pins.
5. DR : 1/2 bias or 1/3 bias drive selection data This control data bit switches between LCD 1/2 bias or 1/3 bias drive.
DR 0 1 Drive scheme 1/3 bias drive 1/2 bias drive
Display Data and Output Pin Correspondence
Output pin S1/P1 S2/P2 S3/P3 S4/P4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 COM1 D1 D5 D9 D13 D17 D21 D25 D29 D33 D37 D41 D45 D49 D53 D57 D61 D65 D69 D73 D77 D81 D85 D89 D93 D97 D101 D105 D109 COM2 D2 D6 D10 D14 D18 D22 D26 D30 D34 D38 D42 D46 D50 D54 D58 D62 D66 D70 D74 D78 D82 D86 D90 D94 D98 D102 D106 D110 COM3 D3 D7 D11 D15 D19 D23 D27 D31 D35 D39 D43 D47 D51 D55 D59 D63 D67 D71 D75 D79 D83 D87 D91 D95 D99 D103 D107 D111 COM4 D4 D8 D12 D16 D20 D24 D28 D32 D36 D40 D44 D48 D52 D56 D60 D64 D68 D72 D76 D80 D84 D88 D92 D96 D100 D104 D108 D112 Output pin S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S39 S40 S41 S42 S43 S44 S45 S46 S47 S48 S49 S50 S51 S52 S53 KS1/S54 KS2/S55 COM1 D113 D117 D121 D125 D129 D133 D137 D141 D145 D149 D153 D157 D161 D165 D169 D173 D177 D181 D185 D189 D193 D197 D201 D205 D209 D213 D217 COM2 D114 D118 D122 D126 D130 D134 D138 D142 D146 D150 D154 D158 D162 D166 D170 D174 D178 D182 D186 D190 D194 D198 D202 D206 D210 D214 D218 COM3 D115 D119 D123 D127 D131 D135 D139 D143 D147 D151 D155 D159 D163 D167 D171 D175 D179 D183 D187 D191 D195 D199 D203 D207 D211 D215 D219 COM4 D116 D120 D124 D128 D132 D136 D140 D144 D148 D152 D156 D160 D164 D168 D172 D176 D180 D184 D188 D192 D196 D200 D204 D208 D212 D216 D220
Note: This is for the case where the output pins S1/P1 to S4/P4, KS1/S54 and KS2/S55 are selected for use as segment outputs.
No. 6086-11/27
LC75884E, LC75884W For example, the table below lists the segment output states for the S11 output pin.
Display data D41 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D42 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D43 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D44 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Output pin state (S11) The LCD segments for COM1,COM2,COM3 and COM4 are off. The LCD segment for COM4 is on. The LCD segment for COM3 is on. The LCD segments for COM3 and COM4 are on. The LCD segment for COM2 is on. The LCD segments for COM2 and COM4 are on. The LCD segments for COM2 and COM3 are on. The LCD segments for COM2,COM3 and COM4 are on. The LCD segment for COM1 is on. The LCD segments for COM1 and COM4 are on. The LCD segments for COM1 and COM3 are on. The LCD segments for COM1,COM3 and COM4 are on. The LCD segments for COM1 and COM2 are on. The LCD segments for COM1,COM2 and COM4 are on. The LCD segments for COM1,COM2 and COM3 are on. The LCD segments for COM1,COM2,COM3 and COM4 are on.
Serial Data Output 1. When CL is stopped at the low level
Note: B0 to B3, A0 to A3******CCB address
2. When CL is stopped at the high level
Note: B0 to B3, A0 to A3******CCB address CCB address ...... 43H KD1 to KD30 ........ Key data SA ........................ Sleep acknowledge data Note: If a key data read operation is executed when DO is high, the read key data (KD1 to KD30) and sleep acknowledge data(SA) will be invalid.
No. 6086-12/27
LC75884E, LC75884W Output Data 1. KD1 to KD30 : Key data When a key matrix of up to 30 keys is formed from the KS1 to KS6 output pins and the KI1 to KI5 input pins and one of those keys is pressed, the key output data corresponding to that key will be set to 1. The table shows the relationship between those pins and the key data bits.
KI1 KS1/S54 KS2/S55 KS3 KS4 KS5 KS6 KD1 KD6 KD11 KD16 KD21 KD26 KI2 KD2 KD7 KD12 KD17 KD22 KD27 KI3 KD3 KD8 KD13 KD18 KD23 KD28 KI4 KD4 KD9 KD14 KD19 KD24 KD29 KI5 KD5 KD10 KD15 KD20 KD25 KD30
When the KS1/S54 and KS2/S55 output pins are selected to be segment outputs by control data bits K0 and K1 and a key matrix of up to 20 keys is formed using the KS3 to KS6 output pins and the KI1 to KI5 input pins, the KD1 to KD10 key data bits will be set to 0. 2. SA : Sleep acknowledge data This output data bit is set to the state when the key was pressed. Also, while DO will be low in this case, if serial data is input and the mode is set (to normal or sleep mode) during this period, that mode will be set. SA will be 1 in sleep mode and 0 in normal mode. Sleep Mode Functions Sleep mode is set up by setting S0 or S1 in the control data to 1. The segment outputs will all go low and the common outputs will also go low, and the oscillator on the OSC pin will stop (it will be started by a key press). This reduces power dissipation. This mode is cleared by sending control data with both S0 and S1 set to 0. However, note that the S1/P1 to S4/P4 outputs can be used as general-purpose output ports according to the state of the P0 to P2 control data bits, even in sleep mode. (See the control data description for details.)
No. 6086-13/27
LC75884E, LC75884W Key Scan Operation Functions 1. Key scan timing The key scan period is 384T(s). To reliably determine the on/off state of the keys, the LC75884E/W scans the keys twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low level on DO) 800T(s) after starting a key scan. If the key data dose not agree and a key was pressed at that point, it scans the keys again. Thus the LC75884E/W cannot detect a key press shorter than 800T(s).
Note: *3.In sleep mode the high/low state of these pins is determined by the S0 and S1 bits in the control data. Key scan output signals are not output from pins that are set low.
2. In normal mode * The pins KS1 to KS6 are set high. * When a key is pressed a key scan is started and the keys are scanned until all keys are released. Multiple key presses are recognized by determining whether multiple key data bits are set. 1 * If a key is pressed for longer than 800T(s) (Where T= ---- ) the LC75884E/W outputs a key data read request (a fosc low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if CE is high during a serial data transfer, DO will be set high. * After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75884E/W performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 and 10 k).
No. 6086-14/27
LC75884E, LC75884W 3. In sleep mode * The pins KS1 to KS6 are set to high or low by the S0 and S1 bits in the control data. (See the control data description for details.) * If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the oscillator on the OSC pin is started and a key scan is performed. Keys are scanned until all keys are released. Multiple key presses are recognized by determining whether multiple key data bits are set. 1 * If a key is pressed for longer than 800T(s)(Where T= ---- ) the LC75884E/W outputs a key data read request (a fosc low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if CE is high during a serial data transfer, DO will be set high. * After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75884E/W performs another key scan. However, this dose not clear sleep mode. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 and 10 k). * Sleep mode key scan example Example: S0=0, S1=1 (sleep with only KS6 high)
Note: *4.These diodes are required to reliable recognize multiple key presses on the KS6 line when sleep mode state with only KS6 high, as in the above example. That is, these diodes prevent incorrect operations due to sneak currents in the KS6 key scan output signal when keys on the KS1 to KS5 lines are pressed at the same time.
Multiple Key Presses Although the LC75884E/W is capable of key scanning without inserting diodes for dual key presses, triple key presses on the KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other than these cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be inserted in series with each key. Applications that do not recognize multiple key presses of three or more keys should check the key data for three or more 1 bits and ignore such data.
No. 6086-15/27
LC75884E, LC75884W 1/4 Duty, 1/2 Bias Drive Technique
COM1
VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V VLCD VLCD1, VLCD2 0V
COM2
COM3
COM4
LCD driver output when all LCD segments corresponding to COM1, COM2, COM3 and COM4 are turned off.
LCD driver output when only LCD segments corresponding to COM1 are on
LCD driver output when only LCD segments corresponding to COM2 are on.
LCD driver output when LCD segments corresponding to COM1 and COM2 are on.
LCD driver output when only LCD segments corresponding to COM3 are on.
LCD driver output when LCD segments corresponding to COM1 and COM3 are on.
LCD driver output when LCD segments corresponding to COM2 and COM3 are on.
LCD driver output when LCD segments corresponding to COM1, COM2 and COM3 are on.
LCD driver output when only LCD segments corresponding to COM4 are on.
LCD driver output when LCD segments corresponding to COM2 and COM4 are on.
LCD driver output when all LCD segments corresponding to COM1, COM2, COM3 and COM4 are on.
1/4 Duty, 1/2 Bias Waveforms
No. 6086-16/27
LC75884E, LC75884W 1/4 Duty, 1/3 Bias Drive Technique
COM1
COM2
VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V VLCD VLCD1 VLCD2 0V
COM3
COM4
LCD driver output when all LCD segments corresponding to COM1, COM2, COM3 and COM4 are turned off.
LCD driver output when only LCD segments corresponding to COM1 are on
LCD driver output when only LCD segments corresponding to COM2 are on.
LCD driver output when LCD segments corresponding to COM1 and COM2 are on.
LCD driver output when only LCD segments corresponding to COM3 are on.
LCD driver output when LCD segments corresponding to COM1 and COM3 are on.
LCD driver output when LCD segments corresponding to COM2 and COM3 are on.
LCD driver output when LCD segments corresponding to COM1, COM2 and COM3 are on.
LCD driver output when only LCD segments corresponding to COM4 are on.
LCD driver output when LCD segments corresponding to COM2 and COM4 are on.
LCD driver output when all LCD segments corresponding to COM1, COM2, COM3 and COM4 are on.
1/4 Duty, 1/3 Bias Waveforms
No. 6086-17/27
LC75884E, LC75884W Voltage Detection Type Reset Circuit (VDET) This circuit generates an output signal and resets the system when logic block power is first applied and when the voltage drops, i.e., when the logic block power supply voltage is less than or equal to the power down detection voltage VDET, which is 3.0V, typical. To assure that this function operates reliably, a capacitor must be added to the logic block power supply line so that the logic block power supply voltage VDD rise time when the logic block power is first applied and the logic block power supply voltage VDD fall time when the voltage drops are both at least 1 ms. (See Figure 3.) Power Supply Sequence The following sequences must be observed when power is turned on and off. (See Figure 3.) * Power on :Logic block power supply(VDD) on LCD driver block power supply(VLCD) on * Power off:LCD driver block power supply(VLCD) off Logic block power supply(VDD) off However, if the logic and LCD driver block use a shared power supply, then the power supplies can be turned on and off at the same time. System Reset The LC75884E/W supports the reset methods described below. When a system reset is applied, display is turned off, key scanning is stopped, and all the key data is reset to low. When the reset is cleared, display is turned on and key scanning become possible. 1. Reset methods (1) Reset at power-on and power-down If at least 1 ms is assured as the logic block supply voltage VDD rise time when logic block power is applied, a system reset will be applied by the VDET output signal when the logic block supply voltage is brought up. If at least 1 ms is assured as the logic block supply voltage VDD fall time when logic block power drops, a system reset will be applied in the same manner by the VDET output signal when the supply voltage is lowered. Note that the reset is cleared at the point when all the serial data (the display data D1 to D220 and the control data) has been transferred, i.e., on the fall of the CE signal on the transfer of the last direction data, after all the direction data has been transferred. However, the above operations will be performed regardless of the state (high or low) of the RES pin. If RES is high, the reset will be cleared at the point the above operations are completed. On the other hand, if RES is low, the system will remain in the reset period as long as RES is not set high, even if the above operations are completed. (See Figure 3.)
No. 6086-18/27
LC75884E, LC75884W
Note: t1 1 [ms] (Logic block power supply voltage VDD rise time) t2 0 t3 0 t4 1 [ms] (Logic block power supply voltage VDD fall time)
(2) Reset when the logic block power supply voltage is in the allowable operating range (VDD = 4.5 to 6.0V) The system is reset when the RES pin is set low, and the reset is cleared by setting RES pin high. 2. LC75884E/W internal block states during the reset period * CLOCK GENERATOR Reset is applied and the base clock is stopped. However, the OSC pin state (normal or sleep mode) is determined after the S0 and S1 control data bits are transferred. * COMMON DRIVER, SEGMENT DRIVER & LATCH Reset is applied and the display is turned off. However, display data can be input to the latch circuit in this state. * KEY SCAN Reset is applied, the circuit is set to the initial state, and at the same time the key scan operation is disabled. * KEY BUFFER Reset is applied and all the key data is set to low. * CCB INTERFACE, CONTROL REGISTER, SHIFT REGISTER Since serial data transfer is possible, these circuits are not reset.
No. 6086-19/27
LC75884E, LC75884W
3. Output pin states during the reset period
Output pin S1/P1 to S4/P4 S5 to S53 COM1 to COM4 KS1/S54, KS2/S55 KS3 to KS5 KS6 DO State during reset L *5 L L L *5 X *6 H H *7
X: don't care Note: *5.These output pins are forcibly set to the segment output function and held low. *6.When power is first applied, these output pins are undefined until the S0 and S1 control data bits have been transferred. *7.Since this output pin is an open-drain output, a pull-up resistor of between 1 and 10 k is required. This pin remains high during the reset period even if a key data read operation is performed.
No. 6086-20/27
LC75884E, LC75884W Sample Application Circuit 1 1/2 bias (for use with normal panels)
Note: *8.
Add a capacitor to the logic block power supply line so that the logic block power supply voltage VDD rise time when power is applied and the logic block power supply voltage VDD fall time when power drops are both at least 1 ms, as the LC75884E/W is reset by the VDET. *9. If the RES pin is not used for system reset, it must be connected to the logic block power supply VDD. *10. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k) appropriate for the capacitance of the external wiring so that signal waveforms are not degraded.
No. 6086-21/27
LC75884E, LC75884W Sample Application Circuit 2 1/2 bias (for use with large panels)
Note: *8.
Add a capacitor to the logic block power supply line so that the logic block power supply voltage VDD rise time when power is applied and the logic block power supply voltage VDD fall time when power drops are both at least 1 ms, as the LC75884E/W is reset by the VDET. *9. If the RES pin is not used for system reset, it must be connected to the logic block power supply VDD. *10. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k) appropriate for the capacitance of the external wiring so that signal waveforms are not degraded.
No. 6086-22/27
LC75884E, LC75884W Sample Application Circuit 3 1/3 bias (for use with normal panels)
Note: *8.
Add a capacitor to the logic block power supply line so that the logic block power supply voltage VDD rise time when power is applied and the logic block power supply voltage VDD fall time when power drops are both at least 1 ms, as the LC75884E/W is reset by the VDET. *9. If the RES pin is not used for system reset, it must be connected to the logic block power supply VDD. *10. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k) appropriate for the capacitance of the external wiring so that signal waveforms are not degraded.
No. 6086-23/27
LC75884E, LC75884W Sample Application Circuit 4 1/3 bias (for use with large panels)
Note: *8.
Add a capacitor to the logic block power supply line so that the logic block power supply voltage VDD rise time when power is applied and the logic block power supply voltage VDD fall time when power drops are both at least 1 ms, as the LC75884E/W is reset by the VDET. *9. If the RES pin is not used for system reset, it must be connected to the logic block power supply VDD. *10. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k) appropriate for the capacitance of the external wiring so that signal waveforms are not degraded.
Notes on transferring display data from the controller The display data (D1 to 220) is transferred to the LC75884E/W in four operations. All of the display data should be transferred within 30 ms to maintain the quality of the displayed image.
No. 6086-24/27
LC75884E, LC75884W Notes on the controller key data read techniques 1. Timer based key data acquisition (1) Flowchart
(2) Timing chart
t5: Key scan execution time when the key data agreed for two key scans. (800T(s)) t6: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again. (1600T(s)) t7: Key address (43H) transfer time 1 T = ------ t8: Key data read time fosc (3) Explanation In this technique, the controller uses a timer to determine key on/off states and read the key data. The controller must check the DO state when CE is low every t9 period without fail. If DO is low, the controller recognizes that a key has been pressed and executes the key data read operation. The period t9 in this technique must satisfy the following condition. t9>t6+t7+t8 If a key data read operation is executed when DO is high, the read key data (KD1 to KD30) and sleep acknowledge data (SA) will be invalid.
No. 6086-25/27
LC75884E, LC75884W 2. Interrupt based key data acquisition (1) Flowchart
(2) Timing chart
t5: Key scan execution time when the key data agreed for two key scans. (800T(S)) t6: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again. (1600T(S)) t7: Key address (43H) transfer time 1 T = ------ t8: Key data read time fosc
No. 6086-26/27
LC75884E, LC75884W (3) Explanation In this technique, the controller uses interrupts to determine key on/off states and read the key data. The controller must check the DO state when CE is low. If DO is low, the controller recognizes that a key has been pressed and executes the key data read operation. After that the next key on/off determination is performed after the time t10 has elapsed by checking the DO state when CE is low and reading the key data. The period t10 in this technique must satisfy the following condition. t10 > t6 If a key data read operation is executed when DO is high, the read key data (KD1 to KD30) and sleep acknowledge data (SA) will be invalid.
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of February, 1999. Specifications and information herein are subject to change without notice. PS No. 6086-27/27

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