NCP5680
Finally, the charge pump can be de ? activated, upon
command from the MCU, during a transmit burst pulse
applied to the PHSEN pin: see typical schematic Figure 6.
In this case, any on going flash keeps going, but no energy
is absorbed from the battery as depicted in Figures 7 and 8.
Similarly, the burst function can be used to smooth the
input battery current as depicted in Figure 9.
R2
6
470k
4
VSD
U2
NTJD1155L
1 5
TXMSK GND
23
D1
PHOTO
R1 22k
NCP5680
PHSEN
GND
Figure 5. Typical Pre Charge and Full Charge
Sequence
Figure 7. GSM Burst during the Re ? charge of
the SuperCAP
TX Mask = 1
Figure 6. Typical Transmit Burst Mask
Figure 8. GSM Burst during a Flash and
Re ? charge Sequence
Figure 9. GSM Active during a Re ? charge Cycle
http://onsemi.com
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