Rainbow Electronics DS1306 - Manual (Page 8)

DS1306
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active-high pulse. IRQF1 is cleared when the address pointer goes to any of the alarm 1 registers during a
read or write. IRQF1 is activated only when the device is powered by V
CC2
or V
BAT
.
TRICKLE CHARGE REGISTER (READ 11H, WRITE 91H)
This register controls the trickle charge characteristics of the DS1306. The simplified schematic of Figure
3 shows the basic components of the trickle charger. The trickle charge select (TCS) bits (bits 4–7)
control the selection of the trickle charger. In order to prevent accidental enabling, only a pattern of 1010
enables the trickle charger. All other patterns disable the trickle charger. The DS1306 powers up with the
trickle charger disabled. The diode select (DS) bits (bits 2–3) select whether one diode or two diodes are
connected between V
CC1
and V
CC2
. The diode select (DS) bits (bits 2–3) select whether one diode or two
diodes are connected between V
CC1
and V
CC2
. The resistor select (RS) bits select the resistor that is
connected between V
CC1
and V
CC2
. The resistor and diodes are selected by the RS and DS bits as shown
in Table 2.
Figure 3. PROGRAMMABLE TRICKLE CHARGER