CY8CKIT-050B Cypress Semiconductor, CY8CKIT-050B Datasheet - Page 35

• Manufacturer Part Number: CY8CKIT-050B
• Description: Development Boards & Kits - ARM PSoC 5LP Development Kit
• Manufacturer: Cypress Semiconductor

Specifications of CY8CKIT-050B

• Rohs: yes
• Product: Development Kits
• Tool Is For Evaluation Of: PSoC 5LP
• Core: ARM Cortex M3
• Interface Type: RS-232, USB
• Operating Supply Voltage: 9 V/12 V

5.1.4
5.2
5.2.1
CY8CKIT-050 PSoC® 5LP Development Kit Guide, Doc. # 001-65816 Rev. *E
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Verify Output
Build and program the code example, and reset the device. The LCD shows the voltage reading cor-
responding to the voltage on the potentiometer.
turn the potentiometer, the voltage value changes. You can also verify the voltage on the potentiom-
eter using a precision multimeter.
Note The potentiometer connects to a differential ADC, which works in single-ended mode. This
means the ADC input is measured against internal Vssa. Any offset in the measurement can be pos-
itive or negative. This can result in a small offset voltage even when the potentiometer is zero.
Figure 5-3. Voltage Display using SAR ADC
Project: VoltageDisplay_DelSigADC
Project Description
This example code measures a simple analog voltage controlled by the potentiometer. The code
uses the internal Del-Sig ADC configured for a 20-bit operation; the ADC range is 0 to Vdda. The
voltage measurement resolution is in microvolts. The results are displayed on the character LCD
module.
Range is set to Vssa to Vdda in single-ended mode because the potentiometer output is a single
ended signal that can go from 0 to Vdda. Therefore, at 12-bit resolution, the ADC will resolve in
steps of Vdda/2
Voltage Reference should be set to Vdda/2 supply voltage when input range is set to ‘Vssa to
Vdda’. It is set to 1.65 V here, because by default Vdda jumper setting on the board is set to 3.3
V. If J11 is changed to select 5 V, then this parameter should be changed to 2.5 V accordingly.
12
.
Figure 5-3
demonstrates the functionality. When you
Code Examples
35