Use Upi Feature; Piezo Actuators - TDK PowerHap Application Note

Piezo Haptic Actuators - PowerHap
Application note for evaluation kit 60 V
Preliminary data

3.1.2 Use UPI feature

Warning - With UPI enabled, the energy recovery feature of the BOS1901 will accumulate energy in
C1A/C1B capacitor, causing COM voltage to increase. The user should make sure that VDD voltage
never exceeds the 5.5 V limit otherwise it may permanently damage the BOS1901. For instance, due to
its larger capacitance, it is not recommended to use the PowerHap™ actuators with 5 V supply and UPI
feature ON. Please refer to BOS1901 data sheet section 6.2.10 for more details.
From default state:

Remove power to the evaluation PCB by unplugging the USB cable

Remove solder joint on one or both SB1X, depending on the choice of UPI configuration

Plug the USB cable to the evaluation PCB, wait for LED D1 (green) to light up and LED De (red) to
turn off

3.2 Piezo actuators

TDK PowerHap™ piezo actuator specifications:
Type
Polarity
Range
It is of utmost importance to not use the TDK PowerHap™ actuators in full-scale mode as it can get
damaged unless the waveform is properly designed to limit the output voltage between -10 V and +60 V.
Example waveforms are provided on Boréas website (www.boreas.ca/bos1901-kit).
Refer to section for a special output configuration, in which two TDK actuators can be connected on a single
BOS1901 circuit:
"Load 1" with red wire connected to "HV+" and black wire on "VDD"
‐
"Load 2" with red wire connected to "HV-" and black wire on "VDD"
‐
Use of full-scale mode with output voltage limited to +60 V
‐
Toggle SW2 to single ended mode (ON)
‐
PPD PI AE/IE PD
Please read Cautions and warnings and
Important notes at the end of this document.
Cymbal design
Red wire on "HV+" terminal
Black wire on "HV-" terminal
Unipolar -10 V to +60 V, use with switch SW1 at "OFF" position
(refer to section DIP Switch settings)
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2019-05-08