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DS1672 Datasheet(PDF) 4 Page - Dallas Semiconductor

Part # DS1672
Description  Low Voltage Serial Timekeeping Chip
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1672 Datasheet(HTML) 4 Page - Dallas Semiconductor

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DS1672
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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
~ 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
100
R1
R2
TRICKLE CHARGE REGISTER
TCS = TRICKLE CHARGER SELECT
DS = DIODE SELECT
RS = RESISTOR SELECT
VCC
VBACKUP
2k
R3
4k


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