 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ3285LF Datasheet(PDF) 6 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
BQ3285LF Datasheet(HTML) 6 Page - Texas Instruments |
|
|
6 / 22 page  On the next update cycle, the RTC updates all 10 bytes in the selected format. 32kHz Output The bq3285LF provides for a 32.768kHz output, and the output is always active whenever VCC is valid (VPFD + tCSR). The bq3285LF output is not affected by the bit settings in Register A. Time-keeping aspects, however, still require setting OS0-OS2. Interrupts The bq3285LF allows three individually selected inter- rupt events to generate an interrupt request. These three interrupt events are: n The periodic interrupt, programmable to occur once every 122 µs to 500ms. n The alarm interrupt, programmable to occur once per second to once per day, is active in battery-backup mode, providing a “wake-up” feature. n The update-ended interrupt, which occurs at the end of each update cycle. Each of the three interrupt events is enabled by an indi- vidual interrupt-enable bit in register B. When an event occurs, its event flag bit in register C is set. If the corre- sponding event enable bit is also set, then an interrupt request is generated. The interrupt request flag bit (INTF) of register C is set with every interrupt request. Reading register C clears all flag bits, including INTF, and makes INT high-impedance. Two methods can be used to process bq3285LF interrupt events: n Enable interrupt events and use the interrupt request output to invoke an interrupt service routine. n Do not enable the interrupts and use a polling routine to periodically check the status of the flag bits. The individual interrupt sources are described in detail in the following sections. Periodic Interrupt If the periodic interrupt event is enabled by writing a 1 to the periodic interrupt enable bit (PIE) in register C, an interrupt request is generated once every 122 µsto 500ms. The period between interrupts is selected with bits RS3-RS0 in register A (see Table 3). 6 Register A Bits Periodic Interrupt OSC2 OSC1 OSC0 RS3 RS2 RS1 RS0 Period Units 0100 0 0 0 None 0100 0 0 1 3.90625 ms 0100 0 1 0 7.8125 ms 0100 0 1 1 122.070 µs 0100 1 0 0 244.141 µs 0100 1 0 1 488.281 µs 0100 1 1 0 976.5625 µs 0100 1 1 1 1.95315 ms 0101 0 0 0 3.90625 ms 0101 0 0 1 7.8125 ms 0101 0 1 0 15.625 ms 0101 0 1 1 31.25 ms 0101 1 0 0 62.5 ms 0101 1 0 1 125 ms 0101 1 1 0 250 ms 0101 1 1 1 500 ms 011 X X X X same as above defined by RS3–RS0 Table 3. Periodic Interrupt Rate bq3285LF |
Similar Part No. - BQ3285LF |
|
Similar Description - BQ3285LF |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
