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DS1672 Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS1672 Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 13 page DS1672 4 of 13 Diode and resistor selection is determined by the user according to the maximum current desired for battery or super cap charging. The maximum charging current can be calculated as illustrated in the following example. Assume that a system power supply of 3 volt is applied to VCC and a super cap is connected to VBACKUP. Also assume that the trickle charger has been enabled with a diode and resistor R2 between VCC and VBACKUP. The maximum current Imax would therefore be calculated as follows: Imax = (3.0V – diode drop) / R2 ~ (3.0V – 0.7V) / 2 k Ω ~ 1.2 mA Obviously, as the super cap changes, the voltage drop between VCC and VBACKUP will decrease and therefore the charge current will decrease. DS1672 PROGRAMMABLE TRICKLE CHARGER Figure 3 1 OF 16 SELECT NOTE: ONLY 1010 ENABLES 1 OF 2 SELECT 1 OF 3 SELECT TCS TCS TCS TCS DS DS RS RS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 100Ω Ω R1 R2 TRICKLE CHARGE REGISTER TCS = TRICKLE CHARGER SELECT DS = DIODE SELECT RS = RESISTOR SELECT VCC VBACKUP 2kΩ R3 4kΩ |
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