Part Number: CC2640R2L
Other Parts Discussed in Thread: CC2640
Hello
We use CC2640 with 3.6V lithium battery. In VDDR power circuit
installed inductor 6.8 uH. Conducted several tests with different
capacitors in the VDDR power circuit at -5 degrees and below.
1. Capacitor 10uF. CC2640 stops working.
2. Capacitor 22uF. CC2640 restarts at a random time with
cause "Brown out detect on VDDR". After a successful OAD, the CC2640 does not
starts. Starts with a new program only at temperatures above
10 degrees.
3. Capacitor 44uF. CC2640 is stable. After a successful OAD
CC2640 starts up with "Brown out detect on VDDR" cause.
4. Capacitor 66uF. CC2640 is stable. After a successful OAD
The CC2640 starts up with the reason "Software reset via SYSRESET register".
5. Capacitor 44 uF, and in the power circuit 3.6 V is additionally installed
Schottky diode. CC2640 is stable. After successful OAD CC2640
starts with the reason "Software reset via SYSRESET register".
6. Capacitor 44 uF, and in the power circuit 3.6 V is additionally installed
resistor 18 Ohms. CC2640 is stable. After successful OAD CC2640
starts with the reason "Software reset via SYSRESET register".
7. Capacitor 44 uF, and in the power circuit 3.6 V is additionally installed
inductor 220uH. CC2640 is stable. After successful OAD CC2640
starts with the reason "Brown out detect on VDDR".
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please comment why is this happening? all nutrition advice says 10uF!!!
can i get your recommendation?
