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DS1673S-3 Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS1673S-3 Datasheet(HTML) 6 Page - Dallas Semiconductor |
6 / 20 page DS1673 6 of 20 TIME OF DAY ALARM BITS Table 1 ALARM REGISTER MASK BITS (BIT 7) SECONDS MINUTES HOURS DAYS 1 1 1 1 Alarm once per second. 0 1 1 1 Alarm when seconds match. 0 0 1 1 Alarm when minutes and seconds match. 0 0 0 1 Alarm when hours, minutes and seconds match. 0 0 0 0 Alarm when day, hours, minutes and seconds match. SPECIAL PURPOSE REGISTERS The DS1673 has two additional registers (control register and status register) that control the Real Time Clock and interrupts. CONTROL REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 EOSC WP AIS1 AIS0 0 0 0 AIE EOSC (Enable Oscillator) - This bit, when set to logic 0 will start the oscillator. When this bit is set to a logic 1, the oscillator is stopped and the DS1673 is placed into a low-power standby mode with a current drain of less than 200 nanoamps when in battery back-up mode. When the DS1673 is powered by VCC, the oscillator is always on regardless of the status of the EOSC bit; however, the Real Time Clock is incremented only when EOSC is a logic 0. WP (Write Protect) - Before any write operation to the Real Time Clock or any other registers, this bit must be logic 0. When high, the write protect bit prevents a write operation to any register. AIS0-AIS1 (Analog Input Select) - These 2 bits are used to determine the analog input for the analog-to- digital conversion. Table 2 lists the specific analog input that is selected by these 2 bits. AIE (Alarm Interrupt Enable) - When set to a logic 1, this bit permits the Interrupt Request Flag (IRQF) bit in the status register to assert INT. When the AIE bit is set to logic 0, the IRQF bit does not initiate the INT signal. ANALOG INPUT SELECTION Table 2 AIS1 AIS0 ANALOG INPUT 0 0 NONE 01 AIN0 10 AIN1 11 AIN2 |
Similar Part No. - DS1673S-3 |
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Similar Description - DS1673S-3 |
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