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DS-72-04 Datasheet, PDF (12/16 Pages) Cymbet Corporation – EnerChip CC with Integrated Power Management | |||
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EnerChip CC CBC3112
EnerChip charging and backup power switchover threshold for 2.5 to 5.5 volt operation is selected by changing
the value of R2 (see Figure 7). To determine the backup switchover point, set the value of R1 to 200k⦠and
choose the value of R2 according to Figure 8. For example, to set a 3.0V trip point: If R1=200 k⦠then R2 = R1
x 0.72 = 144kâ¦. Figure 7 shows a Mode 2 circuit with standard value resistors of 200k⦠and 143kâ¦.
Battery Switchover Threshold Voltage vs. R2/R1
Ratio
6
5
4
3
Trip point
2
1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
R2/R1 Ratio
Figure 8: Mode 2 Resistor Selection Graph
To determine the backup switchover hysteresis for Mode 2 operation, use Figure 9.
Hysteresis in Battery Switchover Threshold
Voltage vs. R2/R1 Ratio
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
R2/R1 Ratio
Hysteresis
Figure 9: Mode 2 Hysteresis as a Function of R2/R1
©2009-2014 Cymbet Corporation ⢠Tel: +1-763-633-1780 ⢠www.cymbet.com
DS-72-04 Rev H
Page 12 of 16
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