Philips PCF8812U-2 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

PCF8812

65 × 102 pixels matrix LCD driver

Product speciﬁcation File under Integrated Circuits, IC12

2000 Nov 22

Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

CONTENTS

1 FEATURES 2 APPLICATIONS 3 GENERAL DESCRIPTION 4 ORDERING INFORMATION 5 BLOCK DIAGRAM 6 PINNING 7 PIN FUNCTIONS

7.1 Pin functions

7.1.1 ROW 0 to ROW 64 row driver outputs

7.1.2 COL 0 to COL 101 column driver outputs

7.1.3 V

7.1.4 V

7.1.5 V

7.1.6 V

7.1.7 V

and V

SS1 DD1 LCDIN LCDOUT LCDSENSE

LCD

SS2

to V

DD3

: LCD power supply

: voltage multiplier regulation input

)

: negative power supply rails

: positive power supply rails

7.1.8 T1 to T5: test pads

7.1.9 SDIN: serial data line

7.1.10 SCLK: serial clock line

7.1.11 D/C: mode select

7.1.12 SCE: chip enable

7.1.13 OSC: oscillator

7.1.14 RES: reset 8 FUNCTIONAL DESCRIPTION

8.1 Oscillator

8.2 Address Counter (AC)

8.3 Display Data RAM (DDRAM)

8.4 Timing generator

8.5 Display address counter

8.6 LCD row and column drivers 9 ADDRESSING

9.1 Data structure

10 INSTRUCTIONS

10.1 Initialization

10.2 Reset function

10.3 Function set

10.3.1 PD

10.3.2 V

10.3.3 H

10.4 Display control

10.4.1 D and E

10.5 Set Y address of RAM

10.6 Set X address of RAM

10.7 Set HV-generator stages

10.8 Bias system

10.9 Temperature control

10.10 Set VOP value 11 LIMITING VALUES 12 HANDLING 13 DC CHARACTERISTICS 14 AC CHARACTERISTICS 15 SERIAL INTERFACE 16 RESET 17 APPLICATION INFORMATION 18 CHIP INFORMATION 19 PAD INFORMATION 20 BONDING PAD LOCATION 21 DEVICE PROTECTION DIAGRAM 22 TRAY INFORMATION 23 DATA SHEET STATUS 24 DEFINITIONS 25 DISCLAIMERS

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Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

1 FEATURES

• 65 row and 102 column outputs

• Display data RAM 65 × 102 bits

• On-chip:

– Configurable 5 (4, 3 and 2) voltage multiplier

generating V

(external V

LCD

also possible)

LCD

– Generation of intermediate LCD bias voltages – Oscillator requires no external components

(external clock also possible).

• External reset input pin

• Serial interface maximum 4.0 Mbit/s

• CMOS compatible inputs

• Mux rate: 1 : 65

• Logic supply voltage range V

DD1

to VSS:

– 2.5 to 5.5 V.

• High voltage generator supply voltage range V

to VSS and V

DD2

DD3

to V

– 2.5 to 4.5 V.

• Display supply voltage range V

LCD

to VSS:

– 4.5 to 9.0 V.

• Low power consumption, suitable for battery operated systems

• Temperature compensation of V

• Temperature range: T

amb

LCD

= −40 to +85 °C

• Slim chip layout, suited for Chip-On-Glass (COG) applications.

2 APPLICATIONS

• Telecom equipment.

3 GENERAL DESCRIPTION

The PCF8812is a low power CMOS LCD controller driver, designed to drive a graphic display of 65 rows and 102 columns. All necessary functions for the display are provided in a single chip, including on-chip generation of LCD supply and bias voltages, resulting in a minimum of external components and low power consumption. The PCF8812 interfaces to microcontrollers via a serial bus interface.

4 ORDERING INFORMATION

PACKAGE

TYPE NUMBER

NAME DESCRIPTION VERSION

PCF8812U/2 Tray chip with bumps in tray −

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Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

5 BLOCK DIAGRAM

handbook, full pagewidth

DD1

DD2VDD3

COL0 to COL101

ROW0 to ROW64

LCDIN

LCDSENSE

LCDOUT

V V

SS1 SS2

T1 T2 T3 T4 T5

BIAS

VOLTAGE

GENERATOR

HIGH

VOLTAGE

GENERATOR

4 stages

COLUMN DRIVERS

DATA LATCHES

DISPLAY DATA RAM

65 × 102 bits

ADDRESS COUNTER

DATA

SDIN SCLK

102

(DDRAM)

I/O BUFFER

D/C

PCF8812

SCE

ROW DRIVERS

SHIFT REGISTER

RESET

OSCILLATOR

TIMING

GENERATOR

DISPLAY ADDRESS COUNTER

RES

OSC

MGT636

Fig.1 Block diagram.

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Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

6 PINNING 7 PIN FUNCTIONS

SYMBOL PAD DESCRIPTION

RES 1 external reset input

(active LOW)

ROW 32 to

2 to 15 LCD row driver outputs

ROW 19 ROW 0 to

18 to 36 LCD row driver outputs

ROW 18 COL0to

COL 101 ROW 50 to

37 to 138 LCD column driver

outputs

139 to 156 LCD row driver outputs

ROW 33 ROW 51 to

159 to 172 LCD row driver outputs

ROW 64 V V V

DD1 DD3 DD2

174 to 179 supply voltage 1

180 supply voltage 3

181 to 193 supply voltage 2 OSC 194 oscillator input SDIN 195 serial data input D/

C 196 data/command input

SCE 197 chip enable input

(active LOW) T2 198 test 2 output SCLK 199 serial clock input V

SS2

SS1

200 to 213 negative power supply 2

214 to 217 negative power supply 1 T1 218 test 1 input T5 219 test 5 input T4 220 test 4 input V

SS1

221 and 222 negative power supply 1 T3 223 test 3 input/output V

LCDIN

LCDOUT

LCDSENSE

224 to 229 LCD supply voltage 230 to 236 voltage multiplier output

237 voltage multiplier

regulation input (V

16, 17, 157,

dummy pads

158 and 173

LCD

7.1 Pin functions

7.1.1 ROW 0 TO ROW 64 ROW DRIVER OUTPUTS These pads output the row signals.

7.1.2 COL 0 TO COL 101 COLUMN DRIVER OUTPUTS These pads output the column signals.

7.1.3 V The 2 supply rails V

SS1

AND V

: NEGATIVE POWER SUPPLY RAILS

SS2

SS1

and V

must be connected

SS2

together.

7.1.4 V V

and V

DD2

TO V

DD1

are the supply voltage for the internal

DD3

: POSITIVE POWER SUPPLY RAILS

DD3

voltage generator. Both have the same voltage and may be connected together outsideof thechip. V supply for the rest of the chip. V together with V

DD2

and V

DD3

can be connected

DD1

but in thiscase care must be

is used as

DD1

taken to respect the supply voltage range (see Chapter 13).

If the internal voltage generator is not used then V V

must be connected to V

DD3

7.1.5 V

: LCD POWER SUPPLY

LCDIN

or connected to power.

DD1

DD2

and

Positive power supply for the liquid crystal display. An external LCDsupply voltage canbe supplied using the V

pad. In thiscase V

LCDIN

LCDOUT

has to beleft open-circuit and the internal voltage generator has to be programmed to zero. If the PCF8812 is in Power-down mode, the external LCD supply voltage has to be switched off.

7.1.6 V

: LCD POWER SUPPLY

LCDOUT

Positive power supply for the liquid crystal display. If the internal voltage generator is used, the two supply rails V

LCDIN

and V

must be connected together. If an

LCDOUT

external supply is used this pin must be left open-circuit.

)

7.1.7 V

LCDSENSE

INPUT

is the input of the internal voltage multiplier

: VOLTAGE MULTIPLIER REGULATION

)

LCD

regulation.

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If the internal voltage generator is used then V mustbe connectedtoV is used then the V

LCDSENSE

.If aexternalsupply voltage

LCDOUT

can be let open-circuit or

connected to ground.

LCDSENSE

Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

7.1.8 T1 TO T5: TEST PADS T1, T3, T4 and T5 must be connected to VSS, T2 must be

left open-circuit. Not accessible to user.

7.1.9 SDIN: SERIAL DATA LINE Serial data input line.

7.1.10 SCLK: SERIAL CLOCK LINE Input for the clock signal 0 to 4.0 Mbits/s.

7.1.11 D/C: MODE SELECT Input to select either command/address or data input.

7.1.12 SCE: CHIP ENABLE The enable pin allows data to be clocked in; the signal is

active LOW.

7.1.13 OSC: OSCILLATOR When the on-chip oscillator is used this input must be

connected to VDD. An external clock signal, if used, is connected to this input. If the oscillator and external clock are both inhibited by connecting the OSC pin to VSS the display is not clocked and may be left in a DC state. To avoid this the chip should always be put into Power-down mode before stopping the clock.

7.1.14 RES: RESET

8.2 Address Counter (AC)

The address counter assigns addresses to the display data RAM for writing. The X address X6 to X0 and the Y address Y3 to Y0 are set separately. After a write operation the address counter is automatically incremented by 1 according to the V flag (see Chapter 9).

8.3 Display Data RAM (DDRAM)

The PCF8812 contains a 65 × 102 bit static RAM which storesthe displaydata. TheRAM is dividedinto 8 banksof 102 bytes (8 × 8 × 102 bits) and one bank of 102 bits (1 × 102 bits). During RAM access, data is transferred to the RAM via the serial interface. There is a direct correspondence between the X address and the column output number.

8.4 Timing generator

The timing generator produces the various signals required to drive the internal circuitry. Internal chip operation is not affected by operations on the data buses.

8.5 Display address counter

The display is generated by continuously shifting rows of RAM data to the dot matrix LCD via the column outputs.

The display status (all dots on/off and normal/inverse video) is set by bits E and D in the command ‘display control’ (see Table 2).

This signal will reset the device and must be applied to properly initialize the chip; the signal is active LOW.

8 FUNCTIONAL DESCRIPTION

8.1 Oscillator

The on-chip oscillator provides the clock signal for the display system.No external componentsare required and the OSC input must be connected to VDD. An external clock signal, if used, is connected to this input.

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8.6 LCD row and column drivers

The PCF8812 contains 65 row and 102 column drivers, which connect the appropriate LCD bias voltages in sequence to the display in accordance with the data to be displayed. Figure 2 shows typical waveforms. Unused outputs should be left unconnected.

Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

ROW 0 R0 (t)

ROW 1 R1 (t)

COL 0 C0 (t)

COL 1 C1 (t)

V V3 − V

LCD

− V

V V V

LCD 2 3

4 5 SS

LCD 2 3

4 5 SS

LCD 2 3

4 5 SS

LCD 2 3

4 5 SS

frame n frame n + 1

state1

state2

(t) (t)

− V

LCD

0 V

V3 − V

LCD

V3 − V

LCD

0 V

V3 − V

− V

012345678... ... 64 012345678... ... 64

(1) V (2) V

state1

state2

(t) = C1(t) − R0(t).

state1

(t) = C1(t) − R1(t).

state2

(t)

Fig.2 Typical LCD driver waveforms.

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V4 − V 0 V VSS − V

V4 − V

V4 − V 0 V

VSS − V

V4 − V

MGT637

− V

LCD

Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

DDRAM

bank 0

top of LCD

bank 1

bank 2

bank 3

bank 7

bank 8

LCD

Fig.3 DDRAM to display mapping.

2000 Nov 22 8

MGS395

Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

9 ADDRESSING

Data is downloaded in bytes into the RAM matrix of the PCF8812 as indicated in Figs.3, 4, 5 and 6. The display RAM has a matrix of 65 × 102 bits. The columns are addressed by the address pointer. The address ranges are: X0 to X101 (1100101) andY0 to Y8 (1000). Addresses outside of these ranges are not allowed.In vertical addressingmode (V = 1) the Y address increments after each byte (see Fig.6). After the last Y address (Y = 8) Y wraps around to 0 and X increments toaddress the nextcolumn. In horizontaladdressing mode (V = 0)the X address incrementsafter each byte (see Fig.5). After the last X address (X = 101) X wraps around to 0 and Y increments to address the next row. After the very last address (X = 101 and Y = 8) the address pointers wrap around to address (X = 0 and Y = 0).

9.1 Data structure

handbook, full pagewidth

MSB

LSB

MSB

LSB

0 101X address

Fig.4 RAM format addressing.

09 110 2 3 4 5 6 7 8

0 101X address

Y address

MGT638

Y address

8917

MGS397

Fig.5 Sequence of writing data bytes into RAM with vertical addressing (V = 1).

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Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

handbook, full pagewidth

012 102 103 104 204 205 206 306 307 308 408 409 410 510 511 512 612 613 614 714 715 716 816 817 818

0 101X address

Fig.6 Sequence of writing data bytes into RAM with horizontal addressing (V = 0).

10 INSTRUCTIONS

The instruction format is divided into two modes: If D/C (mode select) is setLOW thecurrent byteis interpreted as command byte(see Table 1). Figure 8 showsan example of a serial datastream for initializing the chip. If D/C is set HIGH the following bytes are stored in the display data RAM. After every data byte the address counter is incremented automatically. The level of the D/C signal is read during the last bit of the data byte. Every instruction can be sent in any order to the PCF8812. The MSB of a byte is transmitted first. Figure 8 shows one possible command stream, used to set-up the LCD driver. The serial interface is initialized when SCE is HIGH. In this state SCLK clock pulses have no effect and no power is consumedby theserial interface. A negativeedge onSCE enablesthe serialinterface andindicatesthe startofa data transmission.

Y address

8917

MGS396

• SDIN is sampled at the positive edge of SCLK

• D/C indicates whether the byte is acommand (D/C=0)

or RAM data (D/C = 1). It is read with the eighth SCLK pulse

• If SCE stays LOW after the last bit of a command/data byte, theserial interfaceexpects DB7 of the nextbyte at the next positive edge of SCLK (see Fig.12). If SCLK goes LOW after the last data bit (DB0), either:

– A rising clock edge is requiredto latchthe lastdata bit – Or the last bit is latched when SCE goes HIGH.

• A reset pulse with RES interrupts the transmission. No data is written into the RAM. The registers are cleared. If SCE is LOW after the positive edge of RES, the serial interface is ready to receive bit 7 of a command/data byte (see Fig.12).

Figures 9 and 10 show the serial bus protocol:

• When SCE is HIGH, SCLK clocks are ignored. During the HIGH time of SCE the serial interface is initialized (see Fig.12)

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Philips Semiconductors Product speciﬁcation

65 × 102 pixels matrix LCD driver PCF8812

handbook, full pagewidth

handbook, halfpage

MSB (DB7) LSB (DB0)

Fig.7 General format of data stream.

bias systemfunction set (H = 1)

set V

datadata

MGT639

temperature control

X addressY addressdisplay controlfunction set (H = 0)

MGT640

Fig.8 Example of serial data stream.

handbook, full pagewidth

SCE

D/C

SCLK

SDIN

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Fig.9 Serial bus protocol transmission of one byte.

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MGT641

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