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Standard ICs
LCD controller driver for dot matrix displays
BU97701 / BU97702
The BU97701 and BU97702 are controller drivers used in dot matrix liquid crystal displays that display English-language characters, Japanese kana characters, and symbols. These products can be controlled by a 4-bit or an 8-bit MPU. All of the functions necessary to drive dot matrix displays are contained on a single chip, enabling liquid crystal displays to be configured with a small number of chips. These products are available in QFP-T80 (BU97701) and SQFP-T80 (BU97702) packages.
*Applicationsdisplay systems for character displays Liquid crystal *Features 1) Can accommodate 5 x 7 and 5 x 10 dot matrix
LCDs. 2) Equipped with an internal display data RAM of 80 x 8 bits; an expansion driver (BU9706KS) can be used to expand the display up to 80 characters. 3) Internal display data ROM of 12,000 bits 4) Diverse variety of functions includes display clear, cursor home, display on / off, display character blink, display shift, and others.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation BU97701 BU97702 Symbol VDD Pd Topr Tstg Limits - 0.3 ~ + 7.0 9001 8002 - 20 ~ + 75 - 55 ~ + 125 Unit V mW C C
Operating temperature Storage temperature
1 Reduced by 9.0mW for each increase in Ta of 1C over 25C (QFP-T80). 2 Reduced by 8.0mW for each increase in Ta of 1C over 25C (SQFP-T80).
*Recommended operating conditions (Ta = 25C)
Parameter
Power supply voltage
Symbol VDD
Min. 4.5
Typ.
--
Max. 5.5
Unit V
*Model names
Model Number
BU97701-00 / BU97702-00 BU97701-01 / BU97702-01 BU97701-02 / BU97702-02
Built-in font
ROM Ver.00 ROM Ver.01 ROM Ver.02
1
Standard ICs
BU97701 / BU97702
*Block diagram
COM16 COM15 COM14 COM13 COM12 COM11 COM10 SEG39 SEG40 COM9 COM8 COM7 COM6 COM5 COM4 COM3 COM2 COM1 DB7 DB6 DB5 DB4 DB3 42 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 41 DB2
SEG38 SEG37 SEG36 SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29 SEG28 SEG27 SEG26 SEG25 SEG24 SEG23
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Parallel dataserial data conversion 5 5 40-bit shift register 40-bit latch 40-bit segment driver Character generator RAM (CG RAM) 64 x 8 bits Timing generator 7 7 7 8 Character generator ROM (CG ROM) 1200 bits Cursor link control 8 8 16-bit shift register 16-bit common driver 7 Instruction decoder 8 Instruction register (IR) 8 7 8 Data register (IR) 8 Busy flag
40 39 38 Parallel I / F 37 36 35 34 33 32 31 30 29 28 27 26 25
DB1 DB0 E R/W RS D DF VDD CP LOAD V5 V4 V3 V2 V1 OSC2
Address counter 7
Display data RAM (DD RAM) 80 x 8 bits
1 SEG22
2 SEG21
3 SEG20
4 SEG19
5 SEG18
6 SEG17
7 SEG16
8 SEG15
9 SEG14
10 SEG13
11 SEG12
12 SEG11
13 SEG10
14 SEG9
15 SEG8
16 SEG7
17 SEG6
18 SEG5
19 SEG4
20 SEG3
21 SEG2
22 SEG1
23 VSS
24 OSC1
BU97701 (QFP-T80)
2
Standard ICs
BU97701 / BU97702
COM16
COM15
COM14
COM13
COM12
COM11
COM10
*Pin assignments
SEG40 61 SEG39 62 SEG38 63 SEG37 64 SEG36 65 SEG35 66 SEG34 67 SEG33 68 SEG32 69 SEG31 70 SEG30 71 SEG29 72 SEG28 73 SEG27 74 SEG26 75 SEG25 76 SEG24 77 SEG23 78 SEG22 79 SEG21 80
COM9
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
DB7
DB6
DB5
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 DB3 39 DB2 38 DB1 37 DB0 36 E 35 R / W 34 RS 33 D 32 DF
DB4 31 VDD 30 CP 29 LOAD 28 V5 27 V4 26 V3 25 V2 24 V1 23 OSC2 22 OSC1 21 VSS SEG1
TOP VIEW BU97702 (SQFP-T80)
1 SEG20
2 SEG19
3 SEG18
4 SEG17
5 SEG16
6 SEG15
7 SEG14
8 SEG13
9 SEG12
10 11 12 13 14 15 16 17 18 19 20 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2
3
Standard ICs
BU97701 / BU97702
*Pin descriptions
Pin No.
Pin name Function Selects the register used to read / write instructions and data. If RS = 0 and R / W = 0: Instruction register If RS = 0 and R / W = 1: Busy flag and address counter If RS = 1: Data register Signal that selects the read or write operation. This sends and receives data between the BU97701-00 (BU97702) and host computer. R / W = 0: Write R / W = 1: Read Signal which enables reading / writing. Highest four bits of 3-state bi-directional bus. These send and receive data between the BU97701 (BU97702) and host MPU. These are not used with 4-bit operation. Lowest four bits of 3-state bi-directional bus. These send and receive data between the BU97701 (BU97702) and host MPU. Signal output which latches the serial data of the external segment driver. Signal output which shifts the serial data of the external segment driver. AC signal output of the LCD drive waveform. Outputs the data corresponding to the character pattern to an external segment register. 0: OFF data 1: ON data Commons: these are common drive signals. At 1 / 8 duty, COM9 to COM16 are de-selected waveforms. At 1 / 11 duty, COM12 to COM16 are de-selected waveforms.
36 (34)
RS
37 (35)
R/W
38 (36) 39 ~ 42 (37 ~ 40) 43 ~ 46 (41 ~ 44) 31 (29) 32 (30) 34 (32) 35 (33) 47 ~ 62 (45 ~ 60) 22 ~ 1 (20 ~ 1) 80 ~ 63 (80 ~ 61) 30 (28) 26 ~ 29 (24 ~ 27) 33, 23 (31, 21) 24, 25 (22, 23)
E
DB0 ~ DB3
DB4 ~ DB7 LOAD CP DF D
COM1 ~ COM16
SEG1 ~ SEG40 V5 V1 ~ V4 VDD, VSS
Segments: segment drive signals. LCD power supply LCD power supply for external driver.
These must satisfy the following relationship: VDD V1 V2 V3 V4
V5
VSS
Power supply pins; VDD = 5.0 10%, VSS = 0V When the internal clock is operating, the resistance is connected to these pins. When an external clock is operating, the clock is input to OSC1. (OSC2 is open.)
OSC1, OSC2
The 97702 pin numbers are indicated within parentheses.
4
Standard ICs
BU97701 / BU97702
*Input / output circuits
VDD VDD PMOS E NMOS NMOS PMOS CP, LOAD, D, DF
GND
GND
VDD
VDD
PMOS PMOS RS, R / W NMOS OSC1 NMOS NMOS NMOS PMOS PMOS PMOS OSC2
GND
GND
VDD
PMOS DB0 ~ 7
PMOS
NMOS
VDD
Data GND PMOS NMOS Enable
GND
5
Standard ICs
BU97701 / BU97702
*Electrical characteristics (unless otherwise noted, Ta = 25C, VDD = 5V, VSS = 0V)
Parameter
Input high level voltage 1 Input low level voltage 1 Input high level voltage 2 Input low level voltage 2 Output high level voltage 1 Output low level voltage 1 Output high level voltage 2 Output low level voltage 2 COM driver ON resistance SEG driver ON resistance Input current 1 Input current 2 Current dissipation External clock operating frequency External clock duty External clock rise time External clock fall time Internal clock oscillation frequency Enable cycle time Enable pulse width Enable rise / fall times Address setup time Address hold time Data setup time Data hold time (writing) Data delay time Data hold time (reading) CP cycle time CP pulse time CP rise / fall times D delay time LOAD pulse width CPLOAD time LOADCP time DF delay time
Symbol VIH1 VIL1 VIH2 VIL2 VOH1 VOL1 VOH2 VOL2 RCOM RSEG IIN1 IIN2 IDD fIN fDuty tr tf fOSC tEC tEP tEr, tEf tAS tAH tDS tDH tDD1 tOH tCC tWH, tWL tCr, tCf tDD2 tWCP tCL tLC tDFD
Min. 0.8 x VDD 0 2.2 -- VDD - 0.3 -- 2.4 -- -- -- -1 50 -- 125 45 -- -- 190 500 220 -- 40 10 60 10 -- 20 1800 800 -- -- 800 125 0 - 100
Typ. -- -- -- -- -- -- -- -- -- -- -- 125 350 250 50 -- -- 270 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Max. VDD 0.2 x VDD -- 0.8 -- 0.3 -- 0.4 20 30 1 250 600 350 55 200 200 350 -- -- 20 -- -- -- -- 250 -- -- -- 100 100 -- -- -- 100
Unit V V V V V V V V k k A A A kHz % ns ns kHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Conditions
Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1
IOH = - 0.625mA IOL = 0.625mA IOH = - 1.2mA IOL = 2.0mA Id = 50A Id = 50A VIN = 0 ~ VDD Note 1 VDD = 5V, VIN = 0V Note 2 Note 3 Note 4 Note 5 Note 6
Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 -- -- -- -- Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2
6
Standard ICs
Note 1: Current does not include pull-up MOS current.
BU97701 / BU97702
Note 2: External resistance oscillation or external clock input- * * * VDD = 5.0V, fOSC = fcp = 270kHz Note 3: External clock operating
OSC1
External clock
OSC2
Open
Note 4: Applies to OSC1 pin tHW tLW
VDD / 2
VDD / 2
VDD / 2
fDuty = tHW / (tHW + tLW) x 100 (%) Note 5: Applies to OSC1 pin 0.8VDD 0.8VDD
0.2VDD tr
0.2VDD tf
Note 6: Internal oscillation caused by external resistance
OSC1 Rf OSC2
7
Standard ICs
BU97701 / BU97702
*Measurement circuits
V
1 SW1 2 ANY INPUT COM OUT SEG OUT 16 40 1 SW4 2
A
1 2 3 4
VDD
V1 V2 V3 V4 V5 OSC1 VSS SW6 EXPAND OUTPUT OSC2 100k 1 SW5
PG
SW2 6
5
2
SW3
V
GND
SW1
1: ON resistance, output voltage measurement 2: Input voltage, input current measurement 1: ON resistance (in relation to VDD) measurement 2: ON resistance (in relation to V1) measurement
SW3
ON: ON resistance measurement OFF: Current consumption measurement
SW4
1: ON resistance (COM output) measurement 2: ON resistance (COM output) measurement
SW2
3: ON resistance (in relation to V2) measurement 4: ON resistance (in relation to V3) measurement 5: ON resistance (in relation to V4) measurement 6: ON resistance (in relation to V5) measurement
SW5
ON: Output voltage measurement OFF: Current consumption measurement
SW6
1: Current consumption, ON resistance measurement 2: Input voltage measurement
Fig. 1 DC characteristics measurement circuit
ANY INPUT VDD (I / O) 2.4k 8 DB0 ~ 7 10k V5 OSC2 100k OSC1 VSS GND 50pF COM OUT SEG OUT 16 40 COM1 ~ 16 SEG1 ~ 40
PG
130pF
EXPAND OUTPUT
CP, LOAD, D, DF
Fig. 2 Switching characteristics measurement circuit
8
Standard ICs
BU97701 / BU97702
*Timing charts
VIH2 RS VIL2 VIL2 VIH2
VIH2 R/W VIL2 tAS tEr E tEP tEr VIH2
VIH2 VIL2 tAH
VIL2 tDS VIH2 VIH2 VIL2 tOH VIH2 VIH2 VIL2 tEC tDH
Write data
VIL2 tDD1
Read data
VIL2
Fig. 3 Bus read / write timing tCr CP VOL1 tWH VOH1 D VOL1 tDD2 LOAD tCL tWLP VOH1 tLC VOH1 VOL1 tWL tCC tCf VOH1 VI H2
tDFD VOH1 DF VOL1
Fig. 4 Output to expansion driver
9
Standard ICs
character codes and character patterns *Correspondence between00 Rohm Standard: ROM Ver.
Upper bit Lower bit
BU97701 / BU97702
0000
CGRAM
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
XXXX0000
(1)
XXXX0001
(2)
XXXX0010
(3)
XXXX0011
(4)
XXXX0100
(5)
XXXX0101
(6)
XXXX0110
(7)
XXXX0111
(8)
XXXX1000
(1)
XXXX1001
(2)
XXXX1010
(3)
XXXX1011
(4)
XXXX1100
(5)
XXXX1101
(6)
XXXX1110
(7)
XXXX1111
(8)
10
Standard ICs
Rohm Standard: ROM Ver. 01
Upper bit Lower bit
BU97701 / BU97702
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
CGRAM
XXXX0000
(1)
XXXX0001
(2)
XXXX0010
(3)
XXXX0011
(4)
XXXX0100
(5)
XXXX0101
(6)
XXXX0110
(7)
XXXX0111
(8)
XXXX1000
(1)
XXXX1001
(2)
XXXX1010
(3)
XXXX1011
(4)
XXXX1100
(5)
XXXX1101
(6)
XXXX1110
(7)
XXXX1111
(8)
11
Standard ICs
Rohm Standard: ROM Ver. 02
Upper bit Lower bit
BU97701 / BU97702
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
CGRAM
XXXX0000
(1)
XXXX0001
(2)
XXXX0010
(3)
XXXX0011
(4)
XXXX0100
(5)
XXXX0101
(6)
XXXX0110
(7)
XXXX0111
(8)
XXXX1000
(1)
XXXX1001
(2)
XXXX1010
(3)
XXXX1011
(4)
XXXX1100
(5)
XXXX1101
(6)
XXXX1110
(7)
XXXX1111
(8)
12
Standard ICs
BU97701 / BU97702
*Application circuit
,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,
LCD Panel (16Common x 120Segment)
O40
BU9706KS
COM16 COM1 SEG40 SEG1 D DI1 LOAD DF V2 V3 V5
DO20 DI21 DO40 CP DI1
BU9706KS
LOAD
DO20 DI21 DO40 CP GND
BU97701 or BU97702
OSC1
DF LOAD CP V2 V3 V5 OSC2
100k
The BU9706KS is a segment expansion LSI.
Fig. 5
INPUT CURRENT (WITH Pull-up MOS): - Ip (uA)
*Electrical characteristic curves
300 Ta = 25C 1500 Rf = 100k Ta = 25C Pin: V5 = "OPEN" 200 CIRCUIT CURRENT: IDD (uA) 1000
100
500
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
DF
V2
V3
V5
7
POWER SUPPLY VOLTAGE: VDD (V)
POWER SUPPLY VOLTAGE: VDD (V)
Fig. 6 Input current vs. power supply voltage
Fig. 7 Current consumption vs. power supply voltage
O40
O1
O1
13
Standard ICs
BU97701 / BU97702
*External dimensions (Units: mm)
BU97701 BU97702
24.0 0.3 20.0 0.2 64 65 18.0 0.3 14.0 0.2 41 40 61 16.0 0.3 14.0 0.2 40 60 16.0 0.3 14.0 0.2 41
1.2
80 1 2.15 0.1 24
25
80 1 1.4 0.1
21 20
0.15 0.1
0.125 0.1
0.1 0.1
0.05
0.8
0.35 0.1
0.15
0.65
0.3 0.1
0.15
QFP-T80
SQFP-T80
14
0.5

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