SI8718 Datasheet, PDF (6/16 Pages) Silicon Laboratories – EVALUATION BOARD USERS GUIDE

Si871x-EVB
3.5. Adjusting Input Signal Frequency and VDD
Now is a good time to explore some additional functionality of the board. From here the user can do the following:
1. Slowly adjust VDD down to 3 V and up to 5.5 V. Then, take the VDD voltage below 2 V. Once below 2 V, it
can be seen that the Si871x’s UVLO turns on. In this condition, the output should turn off in which case the
square wave disappears.
2. Next, adjust the supply back to 5 V.
3. Now, turn this frequency control dial on the signal generator from tens of Hz up to 15 MHz and observe the
scope output.
3.6. Enable Test (DIP8 and SOIC8 Only)
The next test demonstrates the ENABLE function of the Si8718. To perform this test:
1. Remove the shunt on J4.
2. Connect a clip-to-clip wire from P2, Pin2 (VE/VL) to P2, Pin4 (GND2).
3. The output should be pulled to Hi-z and the square wave turned off.
4. To resume normal operation, remove the clip-to-clip wire on P2, and reinstall the shunt on J4 (position 1-2).
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