DS1306

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STATUS REGISTER (READ 10H)

BIT7

BIT6

BIT5

BIT4

BIT3

BIT2

BIT1

BIT0

000000

IRQF1

IRQF0

IRQF0 (Interrupt 0 Request Flag) - A logic 1 in the Interrupt Request Flag bit indicates that the current

IRQF0 is cleared when any of the Alarm 0 registers are read or written.

IRQF1 (Interrupt 1 Request Flag) - A logic 1 in the Interrupt Request Flag bit indicates that the current

time has matched the Alarm 1 registers. If the AIE1 bit is also a logic 1, the INT1 pin will generate a

62.5- ms active high pulse. IRQF1 is cleared when any of the Alarm 1 registers are read or written.

TRICKLE CHARGE REGISTER (READ 11H, WRITE 91H)

This register controls the trickle charge characteristics of the DS1306. The simplified schematic of

Figure 4 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 will enable the trickle charger. All other patterns will disable the trickle charger. The DS1306

powers up with the trickle charger disabled. The diode select (DS) bits (bits 2-3) select whether one

10, two diodes are selected. If DS is 00 or 11, the trickle charger is disabled independently of TCS. The

resistor select (RS) bits as shown in Table 2.

PROGRAMMABLE TRICKLE CHARGER Figure 4