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DS1643 Datasheet(PDF) 3 Page - Dallas Semiconductor |
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DS1643 Datasheet(HTML) 3 Page - Dallas Semiconductor |
3 / 14 page DS1643/DS1643P 3 of 14 BLOCK DIAGRAM DS1643 Figure 1 DS1643 TRUTH TABLE Table 1 VCC CE CE2 OE WE MODE DQ POWER VIH X X X DESELECT HIGH Z STANDBY XVIL X X DESELECT HIGH Z STANDBY VIL VIH XVIL WRITE DATA IN ACTIVE VIL VIH VIL VIH READ DATA OUT ACTIVE 5 VOLTS ± 10% VIL VIH VIH VIH READ HIGH Z ACTIVE <4.5 VOLTS >VBAT XXXX DESELECT HIGH Z CMOS STANDBY <VBAT XXXX DESELECT HIGH Z DATA RETENTION MODE SETTING THE CLOCK The 8-bit of the control register is the write bit. Setting the write bit to a 1, like the read bit, halts updates to the DS1643 registers. The user can then load them with the correct day, date and time data in 24 hour BCD format. Resetting the write bit to a 0 then transfers those values to the actual clock counters and allows normal operation to resume. STOPPING AND STARTING THE CLOCK OSCILLATOR The clock oscillator may be stopped at any time. To increase the shelf life, the oscillator can be turned off to minimize current drain from the battery. The OSC bit is the MSB for the seconds registers. Setting it to a 1 stops the oscillator. FREQUENCY TEST BIT Bit 6 of the day byte is the frequency test bit. When the frequency test bit is set to logic 1 and the oscillator is running, the LSB of the seconds register will toggle at 512 Hz. When the seconds register is being read, the DQ0 line will toggle at the 512 Hz frequency as long as conditions for access remain valid (i.e., CE low, OE low, CE2 high, and address for seconds register remain valid and stable). CLOCK ACCURACY (DIP MODULE) The DS1643 is guaranteed to keep time accuracy to within ±1 minute per month at 25°C. CLOCK ACCURACY (POWERCAP MODULE) The DS1643P and DS9034PCX are each individually tested for accuracy. Once mounted together, the module is guaranteed to keep time accuracy to within ±1.53 minutes per month (35 ppm) at 25°C. |
Similar Part No. - DS1643_1 |
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Similar Description - DS1643_1 |
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