OKI ML9050, ML9051 Datasheet

PEDL9050-02

Preliminary

PEDL9050-02

¡ Semiconductor ML9050/9051

¡ Semiconductor

This version: Dec. 1999

Previous version: Jun. 1999

ML9050/9051

132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays

GENERAL DESCRIPTION

The ML9050/9051 is an LSI for dot matrix graphic LCD devices carrying out bit map display. This LSI can drive a dot matrix graphic LCD display panel under the control of an 8-bit microcomputer. Since all the functions necessary for driving a bit map type LCD device are incorporated in a single chip, using the ML9050/9051 makes it possible to realize a bit map type dot matrix graphic LCD display system with only a few chips. Since the bit map method in which one bit of display RAM data turns ON or OFF one dot in the display panel, it is possible to carry out displays with a high degree of freedom such as Chinese character displays, etc. With one chip, it is possible to construct a graphic display system with a maximum of 132 ¥ 65 dots. The display can be expanded further using two chips. The ML9050/9051 is made using a CMOS process. Because it has a built-in RAM, low power consumption is one of its features, and is therefore suitable for displays in battery-operated portable equipment. The ML9050 has 65 common signal outputs and 132 segment signal outputs and one chip can drive a display of up to 65 ¥ 132 dots. The ML9051 has 49 common signal outputs and 132 segment signal outputs and one chip can drive a display of up to 49 ¥ 132 dots. This device is not resistant to radiation or to light.

FEATURES

• Direct display of the RAM data using the bit map method Display RAM data "1" ... Dot is displayed Display RAM data "0" ... Dot is not displayed

• Display RAM capacity ML9050/9051: 65 ¥ 132 = 8580 dots

• LCD Drive circuits ML9050: 65 common outputs, 132 segment outputs ML9051: 49 common outputs, 132 segment outputs

• Microcomputer interface: Can select an 8-Bit parallel or serial interface

• Built-in voltage multiplier circuit for the LCD drive power supply

• Built-in LCD drive power supply adjustment circuit

• Built-in LCD drive bias resistors

• Line reversal drive/frame reversal drive (selected by a command)

• Built-in oscillator circuit (Internal RC oscillator/external clock input)

• A variety of commands Read/write of display data, display ON/OFF, normal/reverse display, all dots ON/all dots OFF, set page address, set display start address, etc.

• Power supply voltage Logic power supply: VDD-VSS = 1.8 V to 5.5 V Voltage multiplier reference voltage: VIN-VSS = 1.8 V to V (5-Times multiplier Æ 1.8 V to 3.6 V, 6-times multiplier Æ 1.8 to 3 V, 7-times multiplier Æ 1.8 to 2.5 V) LCD Drive voltage: VBI-VSS = 6.0 to 18 V

• Package: Gold bump chip, TCP

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BLOCK DIAGRAM

V1 V2 V3 V4 V5

VC1+ VS1– VC2+ VS2–

VC3+ VC4+ VC5+ VC6+

VOUT

VRS

IRS

HPM

Display data latch circuit

I/O Buffer

Power supply circuit

Page address circuit

Column address circuit

SEG0

SEG Drivers

Display data RAM

132 ¥ 65

SEG131

COM0

Drivers

COM Output state

selection cricuit

Line address circuit

COM

COM63

COMS

FRS

FR CL

DOF

M/S

CLS

Oscillator circuit Display timing generator circuit

C86

Bus holder

CS1

CS2

RD(E)

Command decoder Status

MPU lnterface

P/S

RES

D7(SI)

WR(R/W)

D6(SCL)

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PIN DESCRIPTION

Function

MPU Interface

Pin name

CS2

(E)

(R/W)

Number

of pins

1IA0

1IRES

2ICS1

1IRD

1IWR

1IC86

I/O

This is an 8-bit bi-directional data bus that can be connected to an 8-bit

I/OD0 to D7

or 16-bit standard MPU data bus. When a serial interface is selected (P/S = "L"): D7: Serial data input pin (SI) D6: Serial clock input pin (SCL) In this case, D0 to D5 will be in the Hi-Z state. D0 to D7 will all be in the Hi-Z state when the chip select is in the inactive state. Normally, the lowest bit of the MPU address bus is connected and used for distinguishing between data and commands. A0 = "H": Indicates that D0 to D7 is display data. A1 = "L": Indicates that D0 to D7 is control data. Initial setting is made by making RES = "L". The reset operation is made during the active level of the RES signal. These are the chip select signals. The Chip Select of the LSI becomes active when CS1 is "L" and also CS2 is "H" and allows the input/output of data or commands. The active level of this signal is "L" when connected to an 80-series MPU. This terminal is connected to the RD signal of the 80-series MPU, and the data bus of the ML9050/9051 goes into the output state when this signal is "L". The active level of this signal is "H" when connected to a 68-series MPU. This pin will be the Enable and clock input pin when connected to a 68series MPU. The active level of this signal is "L" when connected to an 80-series MPU. This terminal is connected to the WR signal of the 80-series MPU. The data on the data bus is latched into the ML9052 at the rising edge of the WR signal. When connected to a 68-series MPU, this pin becomes the input pin for the Read/Write control signal. R/W = "H": Read, R/W = "L": Write This is the pin for selecting the MPU interface type. C86 = "H": 68-Series MPU interface. C86 = "L": 80-Series MPU interface.

Description

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Function

MPU Interface

Oscillator circuit

Display timing generator circuit

Pin name

P/S

Number

of pins

I/O

1ICLS

1IM/S

Description

This is the pin for selecting parallel data input or serial data input. P/S = "H": Parallel data input. P/S = "L": Serial data input. The pins of the LSI have the following functions depending on the state of P/S input.

P/S Data/command Data Read/Write Serial clock

"H" "L"

A0 A0

D0 to D7

SI (D7)

RD, WR

Write only

SCL (D6)

When P/S is "L", D0 to D5 will go into the Hi-Z state. In this condition, the data on the lines D0 to D5 can be "H", "L", or open. The pins RD (E) and WR (R/W) should be tied to either the "H" level or the "L" level. During serial data input, it is not possible to read the display data in the RAM. This is the pin for selecting whether to enable or disable the internal oscillator circuit for the display clock. CLS = "H": The internal oscillator circuit is enabled. CLS = "L": The internal oscillator circuit is disabled (External input). When CLS = "L", the display clock is input at the pin CL. This is the pin for selecting whether master operation or slave operation is made towards the ML9050/9051. During master operation, the synchronization with the LCD display system is achieved by inputting the timing signals necessary for LCD display. M/S = "H": Master operation M/S = "L": Slave operation The functions of the different circuits and pins will be as follows depending on the states of M/S and CLS signals.

Power

supply circuit

Enabled

Enabled Disabled Disabled

Output

Input Input Input

"L"

Oscillator

circuit

Enabled Disabled Disabled Disabled

M/S CLS DOFFRSFRCL

"H" "H"

"L" "H"

Output Output

Input Input

Output Output Output Output

Output Output

Input Input

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Function

Display timing generator circuit

Power supply circuit

Pin name

Number

of pins

1 I/OCL

1 I/OFR

1 I/ODOF

1OFRS

1IIRS

1IHPM

13 —V

9—V 4—V

DescriptionI/O

This is the display clock input/output pin. The function of this pin will be as follows depending on the states of M/S and CLS signals.

M/S CLS CL

"H" "H"

"L" "H"

"L"

Output

Input Input Input

When the ML9050/9051 is used in the master/slave mode, the corresponding CL pin has to be connected. This is the input/output pin for LCD display frame reversal signal. M/S = "H": Output M/S = "L": Input When the ML9050/9051 is used in the master/slave mode, the corresponding FR pin has to be connected. This is the blanking control pin for the LCD display. M/S = "H": Output M/S = "L": Input When the ML9050/9051 is used in the master/slave mode, the corresponding DOF pin has to be connected. This is the output pin for static drive. This pin is used in combination with the FR pin. This is the pin for selecting the resistor for adjusting the voltage V1. IRS = "H": The internal resistor is used. IRS = "L": The internal resistor is not used. The voltage V1 is adjusted using the external potential divider resistors connected to the pins VR. This pin is effective only in the master operation. This pin is tied to the "H" or the "L" level during slave operation. This is the power control pin for the LCD drive power supply circuit.

HPM = "H": Normal mode HPM = "L": High power mode

This pin is effective only during master operation mode. This pin is tied to the "H" or the "L" level during slave operation. This pin is tied to the MPU power supply terminal VCC. This is the 0 V pin connected to the system ground (GND). This is the reference power supply of the voltage multiplier circuit for driving the LCD.

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Function

Power supply circuit

Pin name

OUT

V2 V3 V4 V5

Number

of pins

2—V

2OV

10 —V1

DescriptionI/O

This is the external input VREG power supply for the LCD power supply voltage adjustment circuit. (This pin should be left open when not used as an external input) This pin is effective only in the case of optional devices with the VREG external input option. These are the output pins during voltage multiplication. Connect a capacitor between these pins and V

These are the multiple level power supply pins for the LCD power supply. The voltages specified for the LCD cells are applied to these pins after resistor network voltage division or after impedance transformation using operational amplifiers. The voltages are specified taking V

as the

reference, and the following relationship should be maintained among them. V1 ≥ V2 ≥ V3 ≥ V4 ≥ V5 ≥ V

Master operation: When the power supply is ON, the following voltages are applied to V2 to V5 from the built-in power supply circuit. The selection of voltages is determined by the LCD bias set command.

ML9050 V2 8/9 ¥ V1 6/7 ¥ V1 V3 7/9 ¥ V1 5/7 ¥ V1 V4 2/9 ¥ V1 2/7 ¥ V1 V5 1/9 ¥ V1 1/7 ¥ V1

ML9051 V2 7/8 ¥ V1 5/6 ¥ V1 V3 6/8 ¥ V1 4/6 ¥ V1 V4 2/8 ¥ V1 2/6 ¥ V1 V5 1/8 ¥ V1 1/6 ¥ V1

2IVR

Voltage adjustment pins. Voltages between V1 and VSS are applied using a resistance voltage divider. These pins are effective only when the internal resistors for voltage V1 adjustment are not used (IRS = "L"). Do not use these pins when the internal resistors for voltage V1 adjustment are used (IRS = "H").

2OVC1+

These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS1– and these pins.

2OVS1–

These are the pins for connecting the negative side of the capacitors for voltage multiplication. Connect capacitors between these pins and VC1+, VC3+, and VC5+.

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Function

Power supply circuit

LCD Drive output

Pin name

SEG131

Number

of pins

2OVC2+

2OVS2–

2OVC3+

2OVC4+

2OVC5+

2OVC6+

132 OSEG0 to

DescriptionI/O

These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS2– and these pins. These are the pins for connecting the negative side of the capacitors for voltage multiplication. Connect capacitors between these pins and VC2+, VC4+, and VC6+ (during 7-times voltage multiplication). These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS1– and these pins. These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS2– and these pins. These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS1– and these pins. These are the pins for connecting the positive side of the capacitors for voltage multiplication. Connect capacitors between VS2– and these pins (during 7-times voltage multiplication). For 6-times voltage multiplication, connect these pins to the V

OUT

pin. These are the LCD segment drive outputs. One of the levels among V1, V3, V4, and V

is selected depending on the

combination of the display RAM content and the FR signal.

RAM Data FR

Normal display Reverse display

Output voltage

H H V1 V3 H L VSS V4 L H V3 V1 L L V4 V

Power save — V

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Function

Pin name

LCD Drive

COMn

output

Test pin ITEST0

Number

of pins

96 OCOM0 to

2OCOMS

DescriptionI/O

These are the LCD common drive outputs.

COM ML9050 COM0 to COM63 ML9051

COM0 to COM47

One of the levels among V1, V2, V5, and VSS is selected depending on the combination of the scan data and the FR signal.

Scan data FR Output voltage

H H VSS HLV1 LHV2 LLV5

Power save — V

These are the COM output pins only for indicators. Both pins output the same signal. Leave these pins open when they are not used. The same signal is output in both master and slave operation modes. These are the pins for testing the IC chip. Leave these pins open during normal use.

OTEST1

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FUNCTIONAL DESCRIPTION

MPU Interface

• Selection of interface type The ML9050/9051 carries out data transfer using either the 8-bit bi-directional data bus (D7 to D0) or the serial data input line (SI). Either the 8-bit parallel data input or serial data input can be selected as shown in Table 1 by setting the P/S pin to the "H" or the "L" level.

Table 1

P/S CS1 CS2 A0 RD WR C86 D7 D6

H: Parallel input L: Serial input

CS1 CS1

CS2 CS2

A0 A0

—

C86

—

SCL

D5 to D0

(HZ)

A hyphen (—) indicates that the pin can be tied to the "H" or the "L" level.

• Parallel interface When the parallel interface is selected, (P/S = "H"), it is possible to connect this LSI directly to the MPU bus of either an 80-series MPU or a 68-series MPU as shown in Table 2 depending on whether the pin C86 is set to "H" or "L".

Table 2

P/S CS1 CS2 A0 RD WR

H: 68-Series MPU bus L: 80-Series MPU bus

CS1 CS1

CS2 CS2

A0 A0

D7 to D0

R/WWRD7 to D0

D7 to D0

The data bus signals are identified as shown in Table 3 below depending on the combination of the signals A0, RD(E), and WR(R/W) of Table 2.

Table 3

Display data read Display data write Status read Control data write (command)

Common 68-Series 80-Series

A0 R/WRD WR

1 1 0 0

1 0 1 0

0 1 0 1

1 0 1 0

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Serial interface

When the serial interface is selected (P/S = "L"), the serial data input (SI) and the serial clock input (SCL) can be accepted if the chip is in the active state (CS1 = "L" and CS2 = "H"). The serial interface consists of an 8-bit shift register and a 3-bit counter. The serial data is read in from the serial data input pin in the sequence D7, D6, ... , D0 at the rising edge of the serial clock input, and is converted into parallel data at the rising edge of the 8th serial clock pulse and processed further. The identification of whether the serial data is display data or command is judged based on the A0 input, and the data is treated as display data when A0 is "H" and as command when A0 is "L". The A0 input is read in and identified at the rising edge of the (8 ¥ n) th serial clock pulse after the chip has become active. Fig. 1 shows the signal chart of the serial interface. (When the chip is not active, the shift register and the counter are reset to their initial states. No data read out is possible in the case of the serial interface. It is necessary to take sufficient care about wiring termination reflection and external noise in the case of the SCL signal. We recommend verification of operation in an actual unit.)

CS1

CS2

D7SI

D62D53D44D35D26D17D08D79D610D511D412D313D2

Fig. 1

• Chip select The ML9050/9051 has the two chip select pins CS1 and CS2, and the MPU interface or the serial interface is enabled only when CS1 = "L" and CS2 = "H". When the chip select signals are in the inactive state, the D0 to D7 lines will be in the high impedance state and the inputs A0, RD, and WR will not be effective. When the serial interface has been selected, the shift register and the counter are reset when the chip select signals are in the inactive state.

• Accessing the display data RAM and the internal registers Accessing the ML9050/9051 from the MPU side requires merely that the cycle time (t

CYC

) be satisfied, and high speed data transfer without requiring any wait time is possible. Also, during the data transfer with the MPU, the ML9050/9051 carries out a type of pipeline processing between LSIs via a bus holder associated with the internal data bus. For example, when the MPU writes data in the display data RAM, the data is temporarily stored in the bus holder, and is then written into the display data RAM before the next data read cycle. Further, when the MPU reads out data in the display data RAM, first a dummy data read cycle is carried out to temporarily store the data in the bus holder which is then placed on the system bus and is read out during the next read cycle. There is a restriction on the read sequence of the display data RAM, which is that the read instruction immediately after setting the address does not read out the data of that address, but that data is output as the data of the address specified during the second data read sequence, and hence care should be taken about this during reading. Therefore, always one dummy read is necessary immediately after setting the address or after a write cycle. This relationship is shown in Figs 2(a) and 2(b).

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• Data write

MPU

DATA

BUS Holder

Write Signal

Internal timing

Latch

N N+1 N+2 N+3

N+1 N+2 N+3

Fig. 2(a)

• Data read

MPU

DATA

Address Preset

Read Signal

Column Address

Internal timing

BUS Holder

Address Set

N n n+1

Preset N

N n n+1 n+2

Dummy

Read

Increment N+1 N+2

Data Read

#n+1

Fig. 2(b)

• Busy flag The busy flag being "1" indicates that the ML9050/9051 is carrying out internal operations, and hence no instruction other than a status read instruction is accepted during this period. The busy flag is output at pin D7 when a status read instruction is executed. If the cycle time (t

CYC

) is established, there is no need to check this flag before issuing every command and hence the processing performance of the MPU can be increased greatly.

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Display data RAM

• Display data RAM This is the RAM storing the dot data for display and has an organization of 65 (8 pages ¥ 8 bits +1) ¥ 132 bits. It is possible to access any required bit by specifying the page address and the column address. Since the display data D7 to D0 from the MPU corresponds to the LCD display in the direction of the common lines as shown in Fig. 3, there are fewer restrictions during display data transfer when the ML9050/9051 is used in a multiple chip configuration, thereby making it easily possible to realize a display with a high degree of freedom. Also, since the display data RAM read/write from the MPU side is carried out via an I/O buffer, it is done independent of the signal read operation for the LCD drive. Consequently, the display is not affected by flickering, etc., even when the display data RAM is accessed asynchronously during the LCD display operation.

D0 0111---0 D1 1000---0 D2 0000---0 D3 0111---0 D4 1000---0

Display data RAM

COM0 - - COM1 - - COM2 - - COM3 - - COM4 - - -

LCD Display

Fig. 3

• Page address circuit The page address of the display data RAM is specified using the page address set command as shown in Fig. 4. Specify the page address again when accessing after changing the page. The page address 8 (D3, D2, D1, D0 Æ 1, 0, 0, 0) is the RAM area dedicated to the indicator, and only the display data D0 is valid in this page.

• Column address circuit The column address of the display data RAM is specified using the column address set command as shown in Fig. 4. Since the specified column address is incremented (by +1) every time a display data read/write command is issued, the MPU can access the display data continuously. Further, the incrementing of the column address is stopped at the column address of 83H. Since the column address and the page address are independent of each other, it is necessary, for example, to specify separately the new page address and the new column address when changing from column 83H of page 0 to column 00H of page 1. Also, as is shown in Table 4, it is possible to reverse the correspondence relationship between the display data RAM column address and the segment output using the ADC command (the segment driver direction select command). This reduces the IC placement restrictions at the time of assembling LCD modules.

Table 4

SEG Output

ADC D0 = "0" Æ Column Address Æ D0 = "1" ¨ Column Address ¨

0(H) 83(H)

SEG131SEG0

83(H) 0(H)

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• Line address circuit The line address circuit is used for specifying the line address corresponding to the COM output when displaying the contents of the display data RAM as is shown in Fig. 4. Normally, the topmost line in the display (COM0 output in the normal display state of the common output, and COM63 output and COM47 output for the ML9050 and the ML9051, respectively, in the reverse display stage) is specified using the display start line address set command. The display area is 65 lines and 49 lines for the ML9050 and the ML9051, respectively, in the direction of increasing line address from the specified display start line address. It is possible to carry out screen scrolling and page changing by dynamically changing the line address using the display start line address set command.

• Display data latch circuit The display data latch circuit is a latch for temporarily storing the data from the display data RAM before being output to the LCD drive circuits. Since the commands for selecting normal/ reverse display and turning the display ON/OFF control the data in this latch, the data in the display data RAM will not be changed.

Oscillator circuit

This is an RC oscillator that generates the display clock. The oscillator circuit is effective only when M/S = "H" and also CLS = "H". The oscillations will be stopped when CLS = "L", and the display clock has to be input to the CL pin.

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Page Address

D3D2 D1

0000

0001

0010

0011

0100

0101

0110

0111

1000

Data

D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0

00010203040506

828180

SEG0

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

Page0

Page1

Page2

Page3

Page4

Page5

Page6

Page7

Page8

808182

0403020100

SEG127

SEG128

SEG129

SEG130

SEG131

Line

Address

00H 01H 02H 03H 04H 05H 06H 07H

08H

09H 0AH 0BH 0CH 0DH

0EH

0FH 10H 11H 12H 13H 14H 15H 16H 17H

18H

19H

1AH

1BH

1CH 1DH

1EH

1FH

20H

21H

22H

23H

24H

25H

26H

27H

28H

29H

2AH

2BH

2CH 2DH

2EH

2FH

30H

31H

32H

33H

34H

35H

36H

37H

38H

39H

3AH

3BH

3CH 3DH

3EH

3FH

40H

0 1

LCD

When the common

output state is normal display

63Lines 48Lines

(Start)

D0 D0

Out

ADC

The 65th line and the 49th

Column

Address

line for the ML9050 and the ML9051, respectively, accessed irrespective of the display start line address.

COM

Output

COM0 COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 COM9 COM10 COM11 COM12 COM13 COM14 COM15 COM16 COM17 COM18 COM19 COM20 COM21 COM22 COM23 COM24 COM25 COM26 COM27 COM28 COM29 COM30 COM31 COM32 COM33 COM34 COM35 COM36 COM37 COM38 COM39 COM40 COM41 COM42 COM43 COM44 COM45 COM46 COM47 COM48 COM49 COM50 COM51 COM52 COM53 COM54 COM55 COM56 COM57 COM58 COM59 COM60 COM61 COM62 COM63 COMS

Fig. 4

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Display timing generator circuit

This circuit generates the timing signals for the line address circuit and the display data latch circuit from the display clock. The display data is latched in the display data latch circuit and is output to the segment drive output pins in synchronization with the display clock. This circuit generates the timing signals for the line address circuit and the display data latch circuit from the display clock. The display data is latched in the display data latch circuit and is output to the segment drive output pins in synchronization with the display clock. The read out of the display data to the LCD drive circuits is completely independent of the display data RAM access from the MPU. As a result, there is no bad influence such as flickering on the display even when the display data RAM is accessed asynchronously during the LCD display. Also, the internal common timing and LCD frame reversal (FR) signals are generated by this circuit from the display clock. The drive waveforms of the frame reversal drive method shown in Fig. 5(a) for the LCD drive circuits are generated by this circuit. Further, the drive waveforms of the line reversal method shown in Fig. 5(b) can also be generated depending on the issued command.

In the line reversal drive method, it is possible to carry out reverse display drive at every line to a maximum of 32 lines. Fig. 5(b) shows the waveforms of the 1 line reversal drive method.

LCDCK

(display clock)

COM0

COM1

RAM

DATA

SEGn

6465123456

606162636465123456

V1 V2

V5 V

V1 V2

V5 V

V1 V3 V4 V

Fig. 5(a) Waveforms in the frame reversal drive method

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6465123456 606162636465123456

LCDCK

(display clock)

COM0

COM1

RAM

DATA

SEGn

V1 V2

V5 V

V1 V2

V5 V

V1 V3 V4 V

Fig. 5(b) Waveforms in the line reversal drive method

When the ML9050/9051 is used in a multiple chip configuration, it is necessary to supply the slave side display timing signals (FR, CL, and DOF) from the master side. The statuses of the signals FR, CL, and DOF are shown in Table 5.

Table 5

Operating mode FR CL DOF

Master mode (M/S = "H") Output

Slave mode (M/S = "L")

Internal oscillator circuit enabled (CLS = H) Internal oscillator circuit disabled (CLS = L) Internal oscillator circuit enabled (CLS = H) Internal oscillator circuit disabled (CLS = L)

Output

Input Input

Output

Input Input Input

Output Output

Input Input

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Common output state selection circuit (see Table 6)

Since the COM output scanning directions can be set using the common output state selection command in the ML9050/9051, it is possible to reduce the IC placement restrictions at the time of assembling LCD modules.

Table 6

State

Normal Display

Reverse Display

COM Scanning direction

ML9050 ML9051

COM0 Æ COM63 COM63 Æ COM0

COM0 Æ COM47 COM47 Æ COM0

LCD Drive circuits

This LSI incorporates 197 sets and 181 sets of multiplexers for the ML9050 and the ML9051, respectively, that generate 4-level outputs for driving the LCD. These output the LCD drive voltage in accordance with the combination of the display data, COM scanning signals, and the FR signal. Fig. 6 shows examples of the SEG and COM output waveforms in the frame reversal drive method.

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COM0 COM1 COM2

COM3 COM4 COM5

COM6 COM7

COM8 COM9 COM10 COM11 COM12 COM13

COM14 COM15

COM0

COM1

COM2

SEG0

SEG1

SEG2

V V

V1 V2 V3

V4 V5 V

V1 V2 V3

V4 V5 V

V1 V2 V3

V4 V5 V

V1 V2 V3

V4 V5 V

V1 V2 V3

V4 V5 V

V1 V2 V3

V4 V5 V

COM0-SEG0

COM0-SEG1

Fig. 6

V1 V2 V3

V4 V5 0V

-V5

-V4

-V3

-V2

-V1 V1

V2 V3

V4 V5 0V

-V5

-V4

-V3

-V2

-V1

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PEDL9050-02

¡ Semiconductor ML9050/9051

Power supply circuit

This is the low power consumption type power supply circuit for generating the voltages necessary for driving LCD devices, and consists of voltage multiplier circuits, voltage adjustment circuits, and voltage follower circuits. In the power supply circuit, it is possible to control the ON/OFF of each of the circuits of the voltage multiplier, voltage adjustment circuits, and voltage follower circuits using the power control set command. As a result, it is also possible to use parts of the functions of both the external power supply and the internal power supply. Table 7 shows the functions controlled by the 3-bit data of the power control set command and Table 8 shows a sample combination.

Table 7 Details of functions controlled by the bits of the power control set command

Control bit Function controlled by the bit

D2 Voltage multiplier circuit control bit D1 Voltage adjustment circuit (V adjustment circuit) control bit D0 Voltage follower circuit (V/F circuit) control bit

Table 8 Sample combination for reference

Circuit

State used D2 D1 D0

Only the internal power supply is used Only V adjustment and V/F circuits are used Only V/F circuits are used 0 0 1 ¥¥ V1 OPEN Only the external power supply is used

111 V

011 ¥ V

000 ¥¥¥V1 to V5 OPEN

Voltage

multiplier

Adjustment

V/F

External

voltage input

OUT

Voltage

multiplier

pins *

Used

OPEN

*1: The voltage multiplier pins are the pins VC1+, VS1-, VC2+, VS2-, VC3+, VC4+, VC5+, and

VC6+. If combinations other than the above are used, normal operation is not guaranteed.

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PEDL9050-02

¡ Semiconductor ML9050/9051

• Voltage multiplier circuits The connections for 2-times to 7-times voltage multiplier circuits are shown below.

V V V VC6+

VC4+ OPEN OPEN

VC2+

VS2–

VC5+ OPEN OPEN

VC3+

VC1+

VS1–

2-times voltage

multiplier circuit

VC6+

VC4+

VC2+

VS2–

VC5+

VC3+

VC1+

VS1–

OUT

OPEN

3-times voltage

multiplier circuit

OUT

VC6+ VC4+ VC2+ VS2– VC5+ VC3+ VC1+ VS1–

OUT

VC6+ VC4+ VC2+ VS2– VC5+ VC3+ VC1+ VS1–

V V V VC6+ VC4+ VC2+ VS2– VC5+ VC3+

OPEN

VC1+ VS1–

4-times voltage

multiplier circuit

V V V VC6+ VC4+ VC2+ VS2– VC5+ VC3+ VC1+ VS1–

OUT

5-times voltage

multi

lier circuit

6-times voltage

multiplier circuit

7-times voltage

multiplier circuit

Fig. 7

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PEDL9050-02

¡ Semiconductor ML9050/9051

The voltage relationships in voltage multiplication are shown in Fig. 8.

= 7 ¥ V

OUT

= 17.5V

= 6 ¥ V

OUT

= 18 V

= 2.5 V

*1 V

= 0 V

Voltage relationship in 7-times multiplication Voltage relationship in 6-times multiplication

*1 V V

= 3 V

IN SS

= 0 V

Fig. 8

*1: The voltage range of VIN should be set so that the voltage at the pin V

does not exceed

OUT

the absolute maximum rating.

• Voltage adjustment circuit The voltage multiplier output VOUT produces the LCD drive voltage V1 via the voltage adjustment circuit. Since the ML9050/9051 incorporates a high accuracy constant voltage generator, a 64-level electronic potentiometer function, and also resistors for voltage V1 adjustment, it is possible to build a high accuracy voltage adjustment circuit with very few components. In addition, the ML9050/9051 is available in three models with the temperature gradients of - (1) about -0.05%/˚C, (2) about -0.2%/˚C, and (3) external input (input to pin VRS), as a VREG option.

(a) When the internal resistors for voltage V1 adjustment are used It is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD display using commands and without needing any external resistors, if the internal voltage V1 adjustment resistors and the electronic potentiometer function are used. The voltage V1 can be obtained by the following equation A-1 in the range of V1<VOUT.

V1 = (1+(Rb/Ra)) • VEV = (1+(Rb/Ra)) • (1–(a/324)) • VREG (Eqn. A-1)

Internal Rb

Internal Ra

–

VEV (Constant voltage generator + electronic potentiometer)

Fig. 9

VREG is a constant voltage generated inside the IC and its value is constant as given in Table 9 at Ta = 25˚C.

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PEDL9050-02

¡ Semiconductor ML9050/9051

Table 9

Model

(1) Internal power supply –0.05 [%/˚C] 3.0 (2) Internal power supply –0.2 [%/˚C] 3.0 (3) External input — — VRS

Temperature

gradient

Unit VREG

Unit

[V] [V] [V]

Here, a is the electronic potentiometer function which allows one level among 64 levels to be selected by merely setting the data in the 6-bit electronic potentiometer register. The values of a set by the electronic potentiometer register are shown in Table 10.

Table 10

a D5 D4 D3 D2 D1 D0 63 62 61

Rb/Ra is the voltage V1 adjustment internal resistor ratio and can be adjusted to one of 8 levels by the voltage V1 adjustment internal resistor ratio set command. The reference values of the ratio (1+Rb/Ra) according to the 3-bit data set in the voltage V1 adjustment internal resistor ratio setting register are listed in Table 11.

Table 11 Voltage V1 adjustment internal resistor ratio setting register values and the ratio

(1+Rb/Ra) (For reference)

ML9050 ML9051

D2 D1 D0 –0.05 –0.2 VREG *

Temperature gradient of the

model [unit: %/˚C]

0 1 0 1 0 1 0 1

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Temperature gradient of the

model [unit: %/˚C]

–0.05 –0.2 VREG *

3.0

3.5

4.0

4.5

5.0

5.4

5.9

6.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

*1: VREG is the external input.

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