DA6240.001

20 November 2006

2 (10)

BLOCK & APPLICATION DIAGRAM

1x/2x/3x Charge Pump

VOUT

CP1

CN1

VIN (3V)

GND

DIN

Control

Logic

Oscillator

1MHz

0.1uF

0.1uF

0.1uF

EN1

PIEZO SOUNDER

CP2

CN2

0.1uF

EN2

Short Circuit

Protection

VO1

VO2

Figure 1: Charge Pump + Single End Piezo Driver (max 9Vpp)

1x/2x/3x Charge Pump

VOUT

CP1

CN1

VIN (3V)

GND

DIN

Control

Logic

Oscillator

1MHz

0.1uF

0.1uF

0.1uF

EN1

PIEZO SOUNDER

CP2

CN2

0.1uF

EN2

Short Circuit

Protection

VO1

VO2

Figure 2: Charge Pump + Differential Piezo Driver (max 18Vpp)

Table 1 Charge Pump boosting mode selection

DIN

EN1

EN2

Charge Pump

0

-

-

OFF

1

0

0

OFF

1

0

1

1x Mode (VIN)

1

1

0

2x Mode (2xVIN)

1

1

1

3x Mode (3xVIN)

Note: Pulsed signal at digital input DIN is taken as “1” if pulse low time is less than 10 ms!