DA6240.001
20 November 2006
DETAILED DESCRIPTION
MAS6240 first pulse skipping
10
9
8
7
6
5
4
3
2
1
0
VO1
DIN
-20
-10
0
10
20
30
40
50
60
70
-1
time [ms]
Figure 3: Enabling output VO1
The piezo driver is enabled at the second rising edge of the pulse at DIN, thus the signal is transferred to the
piezo output VO1. An 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 continous pulse is fed to the
input DIN, the output VO1 is not enabled. This make it possible to control e.g. a white LED or other device
through pin VOUT while charge pump is enabled, without enabling the piezo output VO1.
MAS6240 first pulse skipping & power down delay
10
8
6
DIN
4
VO2
2
0
-20
-10
0
10
20
30
40
50
60
70
-2
time [sec]
Figure 4: Disabling VO2
Figure 4 is drawn in the case of VO2. The switch-off signal will be generated after the signal at DIN has been low
at least for 10 ms. In the figure 4 the switch-off delay is about 25 ms. Again when new pulses are fed into DIN,
the charge pump and piezo driver will be enabled.
5 (10)
MAS [ MICRO ANALOG SYSTEMS ]
