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 use.

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 select able 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, VSS 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.): VDD = +5.0 ± 0.5 V

- 15 MHz (MAX.): VDD = +3.0 to + 4.5 V

- 12 MHz (MAX.): VDD = +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 88、 72、 56 、 40、 24、 8 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

• Y1->YX Single mode YX->Y1 Single mode PS:X=32、 48、 64、 80、 96、 112、 120 The above 4 shift directions are pin-selectable

• Shift register circuits are reset when XDISPOFF active