Electronic Components Datasheet Search |
|
DS1647P Datasheet(PDF) 3 Page - Dallas Semiconductor |
|
DS1647P Datasheet(HTML) 3 Page - Dallas Semiconductor |
3 / 11 page DS1647/DS1647P 3 of 11 BLOCK DIAGRAM DS1647 Figure 1 TRUTH TABLE DS1647 Table 1 VCC CE OE WE MODE DQ POWER VIH X X DESELECT HIGH-Z STANDBY X X X DESELECT HIGH-Z STANDBY VIL XVIL WRITE DATA IN ACTIVE VIL VIL VIH READ DATA OUT ACTIVE 5V ± 10% VIL VIH VIH READ HIGH-Z ACTIVE <4.5V >VBAT X X X DESELECT HIGH-Z CMOS STANDBY <VBAT X X X DESELECT HIGH-Z DATA RETENTION MODE SETTING THE CLOCK The MSB Bit, B7, of the control register is the write bit. Setting the write bit to a 1, like the read bit halts updates to the DS1647 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 second’s 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 second’s 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, and address for seconds register remain valid and stable). |
Similar Part No. - DS1647P |
|
Similar Description - DS1647P |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |