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SC230
GENERAL 32X3 SEG LCD DISPLAY DRIVER WITH 1/3 DUTY
DESCRIPTIONS
SC230 is a general-purpose external LCD driver.
FEATURES
* Support max. 32x3 LCD SEG * Support max. 24 keys input * 1/3 duty, 1/2 bias * Key input and LCD output can be processed at the same time * SEG0/P1~SEG3/P4 can be as LCD or common output
QFP-64-14x20-1.0
APPLICATIONS
* LCD driver
ORDERING INFORMATION
Device SC230 Package QFP-64-14 X 20-1.0
BLOCK DIAGRAM
11 Xout
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12 Xin 8-bit timer/ Counter 0 WDT Basic timer Clock timer
15 14
XTout XTin OSC Interrupt control KS1 Instruction register PC
BIAS VLC0
5 6 8 3 1 64 33
24 PSW 21 25 27 32 KI6 288 x 4-Bit RAM 2/4 K Bytes ROM Input ports KS4 DO KI1 ALU SP I/O ports
VLC2 LCD driver/ controller COM2
COM0 SEG31
SEG0 DI 19 18 CLK
GND 10
VDD 9
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SC230
ABSOLUTE MAXIMUM RATING(Tamb=25C)
Characteristics Power Supply Input Voltage Output Voltage Operating Temperature Storage Temperature Symbol VDD VI VO Topr Tstg Ratings -0.3~6.5 -0.3~VDD+0.3 -0.3~VDD+0.3 -20~+70 -40~+125 Unit V V V C C
ELECTRICAL CHARACTERISTICS (Tamb=25C,VSS=0v)
Characteristics Operating Voltage Input VTG[H] Input VTG[L] Oscillator Frequency Data Set Time Data Hold Time High Pulse Width Low Pulse Width CE Wait Time CE Set Time CE Hold Time DO Delay Time Symbol VDD VIH1 VIH2 VIL fosc tds tdh tH tL tcp tcs tch tdc VDD=5V, R=33k 26 26 26 26 26 26 26 10 KI1~KI6 Test Conditions Min. 4.5 0.8VDD 0.7VDD 0 2.0 1524 1524 1524 1524 1524 1524 1524 20 Typ. Max. 6.0 VDD VDD 0.3VDD Unit V V V V MHz s s s s s s s s
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CE tL CL tcp DI tds DO tch DO DI tdc tcs tch t H
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SC230
PIN CONFIGURATION
PIN DESCRIPTIONS
Pin No. 1
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Symbol COM0 COM1 COM2 NC BIAS VLC0 VLC1 VLC2 VDD0 VDD1 VSS Xout, Xin TEST XTIN XTOUT Power supply(4.5V~6.0V) Ground LCD voltage input No connection LCD bias control LCD COM
Pin descriptions
2 3
4, 26 5 6 7 8 9 17 10 11, 12 13 14 15
Crystal oscillator input/output Connect to ground Connect to ground No connection
(To be continued)
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SC230
(Continued)
Pin No. 16 18 19 20 25 21 22 23 24 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 www..com 42 43 44 45 46 47 48 49 50 51 52 53 54 55
Symbol RESET CLK DI CE DO KS1 KS2 KS3 KS4 KI1 KI2 KI3 KI4 KI5 KI6 SEG0/P1 SEG1/P2 SEG2/P3 SEG3/P4 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 LCD SEG output Selectable LCD SEG Key signal input Key scan signal output Reset pin(low active) Clock input Serial data input Enable Serial data output
Pin descriptions
(To be continued)
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SC230
(Continued)
Pin No. 56 57 58 59 60 61 62 63 64
Symbol SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31
Pin descriptions
LCD SEG output
FUNCTION DESCRIPTIONS
SERIAL DATA INPUT
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SC230
(1) DD LCD address D1~D96 D97~D126 P0,P1 SC DR (2) Frame data 42H LCD SEG data 0 SEG0/P1~SEG3/P4 function selection LCD switch selection 1/2 bias or 1/3 bias selection
The control data is only in the first frame (DD=0)
CONTROL DATA DESCRIPTION (1)P0,P1: SEG0/P1~SEG3/P4 function selection Control data P0 0 1 P1 0 1 Port SEG0/P1 SEG1/P2 SEG2/P3 SEG3/P4 (2)SC: LCD switch selection SC 0 1 (3) DR:1/2 bias or 1/3 bias selection
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Port description SEG0/P1 S0 P1 SEG1/P2 S1 P2 SEG2/P3 S2 P3 Display data D1 D4 D7 D10 SEG3/P4 S3 P4
Function LCD is on LCD is off
DR 0 1
Function 1/3 bias 1/2 bias
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SC230
LCD DATA AND OUTPUT Use SEG0/P1~SEG3/P4 as display ports Port SEG0/P1 SEG1/P2 SEG2/P3 SEG3/P4 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 COM0 D1 D4 D7 D10 D13 D16 D19 D22 D25 D28 D31 D34 D37 D40 D43 D46 COM1 D2 D5 D8 D11 D14 D17 D20 D23 D26 D29 D32 D35 D38 D41 D44 D47 COM2 D3 D6 D9 D12 D15 D18 D21 D24 D27 D30 D33 D36 D39 D42 D45 D48 Port SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 COM0 D49 D52 D55 D58 D61 D64 D67 D70 D73 D76 D79 D82 D85 D88 D91 D94 COM1 D50 D53 D56 D59 D62 D65 D68 D71 D74 D77 D80 D83 D86 D89 D92 D95 COM2 D51 D54 D57 D60 D63 D66 D69 D72 D75 D78 D81 D84 D87 D90 D93 D96
Use SEG0/P1~SEG3/ P4 as general output port Port SEG0/P1
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COM0 D1 D4 D7 D10 D13 D16 D19 D22 D25 D28 D31 D34 D37 D40 D43 D46
COM1 X X X X D14 D17 D20 D23 D26 D29 D32 D35 D38 D41 D44 D47
COM2 X X X X D15 D18 D21 D24 D27 D30 D33 D36 D39 D42 D45 D48
Port SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31
COM0 D49 D52 D55 D58 D61 D64 D67 D70 D73 D76 D79 D82 D85 D88 D91 D94
COM1 D50 D53 D56 D59 D62 D65 D68 D71 D74 D77 D80 D83 D86 D89 D92 D95
COM2 D51 D54 D57 D60 D63 D66 D69 D72 D75 D78 D81 D84 D87 D90 D93 D96
SEG1/P2 SEG2/P3 SEG3/P4 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15
X= is not considered
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SC230
LCD data output (SEG10): When use SEGXX/P1~SEGXX/P4 as display port LCD data D31 0 0 0 0 1 1 1 1 SERIAL DATA OUTPUT D32 0 0 1 1 0 0 1 1 D33 0 1 0 1 0 1 0 1 SEG10 COM0, 1, 2, LCD SEG off COM2, LCD SEG on COM1, LCD SEG on COM1, 2, LCD SEG on COM0, LCD SEG on COM0, 2, LCD SEG on COM0, 1, LCD SEG on COM0, 1, 2, LCD SEG on The function of input pins
KEY address : 43H KD1~KD24 : key data
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Input
Selection KS1 KS2 KS3 KS4
KI1 KD1 KD7 KD13 KD19
KI2 KD2 KD8 KD14 KD20
KI3 KD3 KD9 KD15 KD21
KI4 KD4 KD10 KD16 KD22
KI5 KD5 KD11 KD17 KD23
KI6 KD6 KD12 KD18 KD24
*If some key is pressed, the corresponding key data is high level keyboard scan.
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SC230
KEYBOARD SCAN 1 Keyboard scan time Keyboard scan spends 4T,and it should be executed twice. Press the corresponding key, then begin the key scan operation, and when the scan is completed (8T), output the signal which is needed by key data transmission.
2
Key data transmission KS1~KS3 pins are low level If the key is pressed, execute the key scan If the key-press time is over 8T, the output key data transmission request signal to the host, if the host transmits a key address, then begin to transmit the key data. If receive the display address when output the key data request signal to the host, then make CE=H, DO=L. If the key data transmission is completed, it will release the request and restore the key scan.
Key on
Key input 1
Key input 2 A
Key on B
Key on C
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Keyboard scan CE LCD data LCD data LCD data 8T(s) 8T(s) 8T(s)
DI
Key address
Key address
DO
[A] Key scan data
[B] Key scan data T = 213/fx (fx = System clock)
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SC230
KEY DATA PROCESS 1 Suppose that the host receives the key data in normal period
t3: Key scan time (8T)... ..The data of the two key scan is different(new key data and already exist data) t4: Key scan time(16T)... The data of the two key scan is the same(new key data and already exist data) t5: Key address(43H)transmission time t6: Key data transmission time t7: t7=t5+ t4+LCD transmission time T =2 13/fx (fx = system clock)
2. Suppose that the host receives key data by interrupt
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t3: Key scan time (8T)... ..The data of the two key scan is different(new key data and already exist data) t4: Key scan time(16T)... The data of the two key scan is the same(new key data and already exist data) t5: Key address(43H)transmission time t6: Key data transmission time t8: t8= t4+LCD transmission time T =2 13/fx (fx = system clock)
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SC230
RESET Port state when reset Output SEG0/P1~SEG3/P4 SEG4~SEG31 COM0~COM2 KS1~KS4 DO
RESET Sequence
State Close L Close L L L L
Output buffer Output buffer Output buffer Output buffer
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SC230
TYPICAL APPLICATION CIRCUIT
COM0
COM1
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COM2
SEG0
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SC230
PACKAGE OUTLINE
QFP-64-14x20-1.0 Unit mm
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HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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