BQ4802LYPWR - Parallel RTC with CPU Supervisor | Texas Instruments
N.º de pieza: BQ4802LYPWR ✓ ActivoBQ4802LYPWR Descripción general
A real-time clock is a clock-and-timing IC that maintains elapsed time and calendar information independently of the main processor. This independence allows a fax machine, copier, industrial controller, point-of-sale terminal, or other embedded system to preserve time across power interruptions. The BQ4802LY family combines the RTC function with a CPU supervisor, placing timekeeping and supply-condition supervision in one package.
Key features include parallel host communication, a century-based calendar, a temperature-compensated reference and comparator circuit for supply monitoring, and an interrupt warning generated before reset. According to the Texas Instruments product page, an out-of-tolerance supply condition causes the device to issue an interrupt warning and subsequently trigger a microprocessor reset. Its 28-pin TSSOP package also measures 0.173 inch, or 4.40 mm, in body width.
The BQ4802LY is implemented as a low-power microprocessor peripheral rather than as a general-purpose communication controller. Its parallel interface provides a direct connection to a processor bus, while the internal clock and calendar maintain time independently. The integrated supervisor simplifies power-fail handling by giving the host advance warning before reset. Exact operating voltage, current, oscillator, and timing limits must be confirmed from the manufacturer datasheet before final design release.
Typical applications include fax machines, copiers, industrial control systems, and point-of-sale equipment. It can also support data acquisition, embedded instrumentation, and communication equipment requiring a calendar-aware time source and a coordinated reset path. The TI product page specifically identifies the BQ4802Y and BQ4802LY families as suitable for these machine, control, and transaction-oriented systems.
Designers should account for the complete 28-pin footprint and verify the selected BQ4802LY package variant against the schematic. Battery-backup implementation, quartz crystal selection, supply thresholds, reset timing, and decoupling require values from the manufacturer datasheet because they were not included in the supplied verified data. PCB signal integrity and clock layout should likewise follow the relevant application guidance.
This page combines the verified manufacturer description, distributor availability information, package details, and explicit data-gap disclosures. It also identifies only drop-in alternatives supported by the supplied cross-reference evidence, avoiding unsupported cross-brand substitutions and distinguishing confirmed compatibility from options that require redesign.
Alternativas directas para BQ4802LYPWR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con BQ4802LYPWR (mismo factor de forma y huella) — difiere en Package, Supply Monitoring.
BQ4802LYPW
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
BQ4802LYPWG4
✅ Sustitución directaConsulte el precio
Ver hoja de datos →BQ4802LYPWR Especificaciones
| Product Type | Real-time clock and calendar with CPU supervisor |
| Device Function | Low-power microprocessor peripheral |
| Timekeeping | Time-of-day clock with century-based calendar |
| Host Interface | Parallel |
| Supply Monitoring | Temperature-compensated reference and comparator circuit |
| Fault Response | Interrupt warning followed by microprocessor reset |
| Encapsulado | 28-pin TSSOP |
| Package Body Width | 4.40 mm (0.173 inch) |
| Tipo de montaje | Surface mount |
Guía de configuración de pines de BQ4802LYPWR 4.40 mm (0.173 inch)
Configuración de pines para BQ4802LYPWR (encapsulado 4.40 mm (0.173 inch)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para BQ4802LYPWR.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
BQ4802LYPWR es adecuado para 6 aplicacións: Industrial Control Systems, Point-of-Sale Terminals, Copiers and Office Equipment, Data Acquisition and Instrumentation, Communication and Network Equipment, Battery-Backed Embedded Products.
Industrial Control Systems
The BQ4802LYPWR fits industrial controllers that need an independent time-of-day record, a century-based calendar, and coordinated power supervision. Its parallel interface supports direct connection to a processor bus, while the integrated CPU supervisor can issue an interrupt warning before reset when the supply is outside the allowed tolerance. This combination is useful in controllers that maintain event timestamps, operate schedules, or need orderly restart behavior after a supply disturbance. The 28-pin TSSOP package is suitable for compact controller boards, although the verified material does not specify voltage thresholds, reset delay, or environmental limits; those values must be confirmed in the manufacturer datasheet before schematic and safety design are frozen.
Recomendado
Point-of-Sale Terminals
The BQ4802LYPWR is appropriate for point-of-sale equipment that records transaction dates and times and requires a processor reset when its supply condition changes. The integrated century-based calendar retains broader date information than a simple time counter, while the parallel host interface allows the terminal processor to access time and alarm-related functions. The CPU-supervisor function adds an orderly warning-and-reset sequence for recovering from an out-of-tolerance supply event. Its 28-pin TSSOP package can support compact terminal designs, but the designer must verify the electrical limits, backup-battery arrangement, calendar initialization, and available I/O functions from the official datasheet.
Recomendado
Copiers and Office Equipment
The BQ4802LYPWR can provide calendar-aware timekeeping for copiers, fax machines, and related office machines while consolidating system monitoring. The Texas Instruments product page explicitly identifies fax machines and copiers as suitable applications for the BQ4802Y and BQ4802LY family. Time-of-day and century-based calendar information supports print, service, billing, and maintenance records, while the CPU supervisor provides a coordinated reset path after a power-related fault. The parallel interface is suitable for a processor-based office appliance, and the 28-pin TSSOP package avoids requiring a separate clock package. Exact oscillator and backup-battery requirements must still be established from the complete manufacturer datasheet.
Recomendado
Data Acquisition and Instrumentation
The BQ4802LYPWR suits data-acquisition equipment that timestamps measurements with calendar information and must manage processor recovery after supply disturbance. Its independent RTC allows logs to retain absolute time even when the main controller is busy or reset, while the parallel bus provides a straightforward host interface for reading clock and calendar registers. The integrated supervisor can warn the processor before asserting reset when the supply becomes out of tolerance, supporting controlled shutdown and data-preservation sequences. For instrumentation, designers should pay particular attention to clock accuracy, oscillator layout, backup source, and reset timing. Those parameters are not included in the verified web snippets and must be obtained from the manufacturer datasheet.
Recomendado
Communication and Network Equipment
The BQ4802LYPWR is applicable to communication equipment requiring a local calendar and event timestamp independent of a network time source. The parallel interface lets a host processor read the RTC while the integrated supply comparator and reset function support recovery after power disturbances. This is useful in gateways, embedded controllers, and specialized communication modules that must retain event chronology even if synchronization with an external server is temporarily unavailable. The BQ4802LYPWR's 28-pin TSSOP package is compatible with compact controller layouts, but engineers should verify signal levels, interface timing, supply range, and backup behavior against the official datasheet before treating it as a drop-in network timing device.
Recomendado
Battery-Backed Embedded Products
The BQ4802LYPWR can serve as the timekeeping element in battery-backed embedded products where calendar continuity and power supervision are required. Its low-power microprocessor-peripheral architecture is intended to reduce the burden on the main processor and provide time-of-day information with a century-based calendar. The CPU-supervisor function adds system-level value by detecting an out-of-tolerance supply condition, warning the processor, and subsequently resetting it. This behavior can support orderly shutdown or restart logic in embedded systems. The verified data does not identify the backup-current consumption or battery-switchover thresholds, so battery sizing and power-budget decisions must use the complete Texas Instruments datasheet rather than estimates from this page.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para BQ4802LYPWR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | BQ4802LYPW | BQ4802LYPWG4 |
|---|---|---|---|
| Package | 28-pin TSSOP, 4.40 mm body width | 28-pin TSSOP, 4.40 mm body width | 28-pin TSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Real-time clock and calendar with CPU supervisor | Real-time clock and calendar with CPU supervisor | Real-time clock and calendar with CPU supervisor |
| Host Interface | Parallel | Parallel | Parallel |
| Time-of-Day Clock | Integrated | Integrated | Integrated |
| Calendar | Century-based calendar | Century-based calendar | Century-based calendar |
| Supply Monitoring | Temperature-compensated reference and comparator circuit | Temperature-compensated reference and comparator circuit | Temperature-compensated reference and comparator circuit |
| Fault Response | Interrupt warning followed by microprocessor reset | Interrupt warning followed by microprocessor reset | Interrupt warning followed by microprocessor reset |
Diferenciadores clave
- Integrated timekeeping and CPU supervision (frente a BQ4802LYPW)
- Parallel host connectivity (frente a BQ4802LYPWG4)
- Advance warning before reset (frente a BQ4802LYPW)
Notas de diseño
Use the manufacturer pinout and layout guidance before assigning the BQ4802LYPWR clock, supply, interrupt, and reset nets. The verified package is a 28-pin TSSOP, but no individual pin definitions were supplied. Place the device near the host parallel-bus interface, keep the clock path compact and away from high-current switching nodes, and route the supervisor output to the correct processor reset or warning signal only after confirming polarity and timing in the datasheet.
Design the supply and backup paths from the official electrical specifications rather than assuming conventional RTC values. According to the TI product page, the BQ4802LY monitors its voltage supply with a temperature-compensated reference and comparator, then generates an interrupt warning before asserting microprocessor reset. Confirm the monitored range, threshold tolerances, switching behavior, and quiescent current to ensure the system has enough time to save data and shut down safely.
Do not treat every BQ4802 ordering suffix as a board-level drop-in choice. The verified results distinguish 28-pin TSSOP versions such as BQ4802LYPW and BQ4802LYPWG4 from BQ4802LYDWR and BQ4802YDWR, which are associated with a 28-pin SOIC package. Verify the exact physical package, pin numbering, marking, tape orientation, and orderable suffix before substituting parts or releasing production artwork.
Route the parallel host interface as a compact, properly referenced bus and apply the interface timing specified by the manufacturer. Keep the RTC and backup-supply area away from high-current loads and noisy switching nodes to reduce supply disturbance and false supervisor events. Because verified switching thresholds and timing values are unavailable, these requirements must be completed using the current TI datasheet and application information before layout release.
Información de cumplimiento
The supplied verified web snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is recorded as not applicable because this is a clock-and-timing IC rather than an automotive-qualified device designation, but automotive qualification status remains unknown.
