DA6240C.007

17 October, 2016

5 (13)

DETAILED DESCRIPTION

MAS6240 first pulse skipping

-1

0

1

2

3

4

5

6

7

8

9

10

-20

0

20

40

60

time [ms]

VO1

DIN

Figure 3. Enabling output VO1

The piezo driver is enabled at the second rising edge of the signal at DIN, thus the signal is transferred to the

piezo output VO1. An inverted output VO2 is enabled at the same time, but it is optional to take it in use. Control

logic is switching the charge pump on at first rising signal of digital input DIN pin. If only one rising edge is fed to

the input DIN, the piezo driver remains disabled. This makes it possible to control e.g. a white LED or other

device through pin VOUT while charge pump is enabled, without enabling the piezo driver. The VO1 and VO2

outputs are at GND when the piezo driver is disabled.

MAS6240 first pulse skipping & power down delay

-1

0

1

2

3

4

5

6

7

8

9

10

-20

0

20

40

60

time [sec]

DIN

VO2

Figure 4. Disabling VO2

Figure 4 is drawn in the case of VO2. The charge pump and piezo driver disable signal will be generated after

the signal at DIN has been low at mostly for 50 ms. In the figure 4 the switch-off delay is about 15 ms. Again

when new pulses are fed into DIN, the charge pump and piezo driver will be enabled.