Sitronix

ST8012

Dot Matrix Lcd

120 Output LCD Common/Segment driver IC

V1.4 1/

2003/11/12

1. DESCRIPTION

The ST8012 is a 120-output segment/common driver

IC suitable for driving small/medium scale dot matrix

LCD panels, and is used in PDA or electronic

dictionary . The ST8012 is good as a segment driver or

a common driver or a common/segment driver, and it

can create a low power consuming, high-resolution

LCD. The ST8012 have eight modes can selected to

set common and segment numbers by select pin. The

ST8012 also have analog DC/DC converter to used.

2. FEATURES

Number of LCD drive outputs: 120

Supply voltage for LCD drive: Max +16V

Supply voltage for the logic system: +2.5 to +5.5 V

Low power consumption and low output impedance

Display duty selectable by select pin

Low-power liquid crystal display power supply circuit

equipped internally.

Booster circuit (with Boost ratio of 2X/3X/4X/5X/6X)

Abundant command functions

LCD bias set, electronic volume, V

voltage

regulation internal resistor ratio and booster

frequency.

All Functions have initial value, user can use the

default value or setting by programmable pin to set.

If select segment mode then except booster circuit

will opened others circuit (follower and regulator

circuit) will automatic closed.

When don't used the serial interface, we can select

one of default modes by serial interface pins please

see Table5.

Package: 154-pin COB.

(Segment mode)

Shift clock frequency

- 20 MHz (MAX.): V

= +5.0 � 0.5 V

- 15 MHz (MAX.): V

= +3.0 to + 4.5 V

- 12 MHz (MAX.): V

= +2.5 to + 3.0 V

Adopts a data bus system

4-bit parallel / serial input modes are selectable with a

mode (P/S) pin

Automatic transfer function of an enable signal

Automatic counting function which, in the chip

selection mode, causes the internal clock to be

stopped by automatically counting 887256 40

248 or 120 bits of input data

Line latch circuits are reset when XDISPOFF active

(Common mode

)

Shift clock frequency: 4 MHz (MAX.)

Built-in X-bit shift register

Available in a single mode

->Y

Single mode

->Y

Single mode

PS:X=3248648096112120

The above 4 shift directions are pin-selectable

Shift register circuits are reset when XDISPOFF

active

SEL

,SEL

DUTY BIAS

0 0 0

---

Segment mode

0 0 1

1/32

1/6 or 1/5

0 1 0

1/48

1/7 or 1/5

0 1 1

1/64

1/9 or 1/7

1 0 0

1/80

1/9 or 1/7

1 0 1

1/96

1/10 or 1/8

1 1 0

1/112

1/11 or 1/9

1 1 1

1/120

1/11 or 1/9

Sitronix ST8012

V1.4 2/

2003/11/12

3. PIN DESCRIPTION

SYMBOL

I/O

DESCRIPTION

No of Num

COMSEG

-COMSEG

119

O LCD drive output

120

P Power supply for LCD drive

L/R

I Display data shift direction selection

P Power supply for logic system (+2.5 to +5.5 V)

EIO

, EIO

I/O

Input/output for chip selection at segment mode and FLM input output

function at com/seg mix mode or common mode

-DI

I Display data input at segment mode

XCK

I Clock input for taking display data at segment mode

XDISPOFF

I Control input for output of non-select level

I Latch pulse input for display data at segment mode/

Shift clock input for shift register at common mode

I AC-converting signal input for LCD drive waveform

XRST

I System Reset pin .When low level active.

The XRST L PULSE timing min value is 200us and max value is 0.5s

P/S I

This is the parallel data input/serial data input switch terminal.

P/S="H": Parallel data input.

P/S="L": Serial data input.

Ground

CAP1- O