AN113
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Table 8. Push Buttons Functions Definition of PWM Scheme
Push Button
Function Description
K1
Turn the LED1 on the CMT2251A-EM to 100% on. Press K1 more than for 5 seconds will send out the
study packet.
K2
Turn the LED1 off
K4
Increase the brightness of the LED1 in 1.5% step size till 100% on.
K5
Decrease the brightness of the LED1 in 1.5% step size till off.
K3, K6
Not used in this scheme.
The user can follow the below instruction to experience the modules in PWM scheme.
1.
Install the latest RFPDK on the PC (refer to “Section 7.1 Installation Steps”) and connect the USB programmer to the PC
with a USB cable, then start the RFPDK on the PC.
2.
Connect the CMT2150A-EM to the USB Programmer with EM-Connector, select CMT2150A on the RFPDK, select the
Advanced Mode, select the PWM configuration on the configuration list, as shown in figure below, and burn the
configuration to the CMT2150A-EM.
Figure 14. Selecting the PWM Configuration of CMT2150A
3.
Repeat step 2 to burn the PWM configuration to the CMT2251A-EM on the RFPDK
Figure 15. Selecting the PWM Configuration of CMT2251A
4.
After the programming is done, the user can start to use the evaluation modules in PWM scheme.
A few key parameters settings in this application scheme are:
Frequency
= 433.92 MHz
Symbol Rate
= 4.8 ksps
Encoder
= 1920
Push Button Setting = PWM, 4 buttons
PWM Default Ratio
=10%
PWM Step Size
=1.5%
PWM Rate
=6.5 kHz
Study Function
= on
Study Button
= Pin11 (K1)
