RTC IC W NVSRAM Control, Watchdog Timer, UP Reset, Interrupts And Battery Low Warning

The BQ4845 Real-Time Clock is Parallel RTC With CPU supervisor Microprocessor Supervisors a low-power Microprocessor peripheral that integrates a time-of-day Clock a 100-year calendar, and a CPU supervisor in a 28-pin SOIC or DIP. The BQ4845 is ideal for fax machines, copiers, Industrial Control systems, point-of-sale terminals, data loggers, and computers.
The BQ4845 provides direct connections for a 32.768KHz quartz crystal and a 3V backup battery. Through the use of the conditional chip enable output (CEOUT) and battery voltage output (VOUT) pins, the BQ4845 CAN write-protect and make nonvolatile external SRAMs The backup cell powers the Real-Time Clock and maintains SRAM information in the absence of system voltage.
The BQ4845 contains a temperature-compensated reference and Comparator circuit that monitors the status of its voltage supply. When the BQ4845 detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a Microprocessor reset. The reset stays active for 200ms after VCC rises within tolerance, to allow for power supply and processor stabilization.
The BQ4845 also has a built-in watchdog Timer to monitor processor operation. If the Microprocessor does not toggle the watchdog input (WDI) within the programmed time-out period, the BQ4845 asserts WDO and RST. WDI unconnected disables the watchdog Timer
The BQ4845 CAN generate other interrupts based on a Clock alarm condition e2a or a periodic setting. The alarm interrupt CAN be set to occur from once per second to once per month. The alarm CAN be made active in the battery-backup mode to serve as a system wake-up call. For interrupts at a rate beyond once per second, the periodic interrupt CAN be programmed with periods of 30.5us to 500ms.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
BQ4845YS-A4NTR Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC
BQ4845YS-A4TR Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC 0 to 70
BQ4845YS-A4TRG4 Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC 0 to 70
BQ4845YS-A4 Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC 0 to 70
BQ4845YS-A4G4 Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC 0 to 70
BQ4845YS-A4NG4 Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC -40 to 85
BQ4845YS-A4N Texas Instruments RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning 28-SOIC -40 to 85
BQ4845YP-A4E3 Texas Instruments IC 1 TIMER(S), REAL TIME CLOCK, PDIP28, 0.600 INCH, ROHS COMPLIANT, PLASTIC, DIP-28, Timer or RTC
BQ4845YS-N Texas Instruments 1 TIMER(S), REAL TIME CLOCK, PDSO28
BQ4845YS Texas Instruments 0 TIMER(S), REAL TIME CLOCK, PDSO28, 0.300 INCH, PLASTIC, SOIC-28
BQ4845Y 's PackagesBQ4845Y 's pdf datasheet
BQ4845YP-A4 PDIP
BQ4845YP-A4E3 PDIP
BQ4845YS-A4 SOIC
BQ4845YS-A4G4 SOIC
BQ4895A45YS-A4N SOIC
BQ4845YS-A4NG4 SOIC
BQ4845YS-A4NTR SOIC
BQ4845YS-A4TR SOIC
BQ4845YS-A4TRG4 SOIC




BQ4845Y Pinout, Pinouts
BQ4845Y pinout,Pin out
This is one package pinout of BQ4845Y,If you need more pinouts please download BQ4845Y's pdf datasheet.

BQ4845Y circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

Related Electronics Part Number

Related Keywords:

BQ4845Y Pb-Free BQ4845Y Cross Reference BQ4845Y Schematic BQ4845Y Distributor
BQ4845Y Application Notes BQ4845Y RoHS BQ4845Y Circuits BQ4845Y footprint