BOS1901-KIT
User Guide
BOS1901CDK01.2 © All rights reserved 2019 Boréas Technologies Inc 9
4.3 DIP Switch Settings
The evaluation PCB is provided by default with S3 DIP Switch set to Unipolar operation with only
Channel A enabled. It is recommended to toggle these switches only while not playing waveforms.
Table 5: S3 DIP switch settings
* Refer to section 4.4 for more details on output configurations
SW1 The output ranges listed for SW1 settings are for full amplitude input signal, for example -1 to
+1 when using Audacity® software (refer to section 5.2). When using Midé PPA-2014 Flex piezo
actuator, set SW1 to ON. When using TDK PowerHap™ piezo actuator, set SW1 to OFF.
More precisely, this switch sets the maximum and minimum values allowable for the selected
range. It does not affect the gain and offset conversion between the input signal and the output
voltage. If the requested voltage is out the range, the firmware will clip the signal to the limits
of the range. Therefore, a single conversion equation is used for the same voltage in both
ranges. The relation between the input signal value and the output voltage is:
𝑆𝑖𝑔𝑛𝑎𝑙 = 𝑉𝑜𝑙𝑡𝑎𝑔𝑒
95 𝑉
Thus signals of +1, -1 and 0 correspond to 95 V, -95 V and 0 V respectively. To generate a 60 V
output, the signal should be 60 V/95 V = 0.631.
SW2 Refer to section 4.4 for configuration details. Sensing is not possible in single-ended
configuration.
SW3 SW3 determines how many channels are active. Set SW3 to OFF to activate only channel A. Set
SW3 to ON to activate both channels. When a channel is activated it can sense pressure and
give feedback, and it can play waveforms.
SW4 When both channels are active (SW3 is ON), set SW4 to OFF to have both channels feedback a
single click. Setting SW4 to ON will maintain channel A to feedback single clicks but channel B
will give three feedback response levels depending on the exerted pressure. A low-level
