ST8012 datasheet(23/47 Pages) SITRONIX

23 / 47 page

ST8012

V1.6

23/47

2004/09/08

The Step-up Voltage Circuits

Using the step-up voltage circuits equipped within the

ST8012 chips it is possible to product a 2X, 3X, 4X, 5X

or 6X step-up of the VDD – VSS voltage levels.

6X step-up:

Connect capacitor C1 between CAP1+ and CAP1–,

between CAP2+ and CAP2–, between CAP1+ and

CAP3–, between CAP2+ and CAP4–,between CAP1+

and CAP5–, and between VDD and VOUT, to produce a

voltage level in the negative direction at the VOUT

terminal that is 6 times the voltage level between VDD

and VSS.

5X step-up:

Connect capacitor C1 between CAP1+ and CAP1–,

between CAP2+ and CAP2–, between CAP1+ and

CAP3–, between CAP2+ and CAP4–,and between VDD

and VOUT, to produce a voltage level in the negative

direction at the VOUT

terminal that is 5 times the

voltage level between VDD and VSS.

4X step-up:

Connect capacitor C1 between CAP1+ and CAP1–,

between CAP2+ and CAP2–, between CAP1+ and

CAP3–, and between VDD and VOUT, to produce a

voltage level in the negative direction at the VOUT

terminal that is 4 times the voltage level between VDD

and VSS.

3X step-up:

Connect capacitor C1 between CAP1+ and CAP1–,

between CAP2+ and CAP2– and between VDD and

VOUT,and short between CAP3– and VOUT to produce

a voltage level in the negative direction at the VOUT

terminal that is 3 times the voltage difference between

VDD and VSS. The step-up voltage relationships are

shown in Figure2.

2X step-up:

Connect capacitor C1 between CAP1+ and CAP1–,

and between VDD and VOUT, leave CAP2+ open, and

short between CAP2–, CAP3– and VOUT to

produce

a voltage in the negative direction at the VOUT terminal

that Is twice the voltage between VDD and VSS.

ST8012 Datasheet(PDF) 23 Page - Sitronix Technology Co., Ltd.

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