BQ4802YPWRG4 - Parallel RTC with CPU Supervisor | TI
Артикул: BQ4802YPWRG4 ✓ АктивенBQ4802YPWRG4 Обзор
A real-time clock, or RTC, is a clock and timing semiconductor that maintains time-of-day and calendar information independently of the main processor. In the broader hierarchy, an RTC is a clock and timing IC, followed by timer and real-time-clock ICs. Integrating a CPU supervisor with an RTC allows a system to retain calendar information while also monitoring a supply rail and recovering a processor or other circuit when voltage falls outside acceptable limits.
The BQ4802YPWRG4 combines several timing and supervisory functions in one package. Its parallel interface supports integration with processors that use a parallel bus, while the integrated clock and calendar provide year, month, day, and time-of-day tracking. The device also includes an alarm, daylight-saving capability, leap-year handling, watchdog-timer support, and external NVSRAM control, reducing the number of separate support components required in embedded equipment.
The 5 V supply requirement and 0.032 MHz maximum clock frequency distinguish this device from low-voltage, serial-interface RTC families. A maximum frequency of 0.032 MHz corresponds to 32 kHz, providing a conventional timekeeping reference for the oscillator section. The operating temperature range shown by the distributor data is 0 °C to 70 °C, placing the specified grade in commercial temperature conditions.
Typical uses include industrial controllers, embedded processors, data-acquisition equipment, instrument systems, and compact control products that require both continuous timekeeping and supply supervision. Its interrupt output allows a host processor to respond to scheduled events or supervisory conditions, while external NVSRAM control can coordinate retained memory with the RTC.
Designers should verify oscillator characteristics, reset behavior, interface timing, interrupt polarity, and the external NVSRAM connection in the manufacturer datasheet before layout. Because the device uses a 28-pin TSSOP, adequate routing clearance and careful ground-return planning are important for reliable clock accuracy and clean supervisor operation.
This page combines distributor availability, exact package information, Y2K-compliant parallel RTC positioning, and same-family alternatives with practical design guidance. It helps engineers distinguish the BQ4802YPWRG4 from timer-only ICs and from RTCs that lack the integrated CPU supervisor, watchdog, and external NVSRAM control features.
Аналоги без доработки для BQ4802YPWRG4 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с BQ4802YPWRG4 (тот же форм-фактор и посадочное место) — отличается по Interface Type, Package Width, Product Type, Supply Voltage.
BQ4802YPW
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Открыть даташит →BQ4802YPWRG4 Характеристики
| Product Type | 1 real-time clock and calendar IC |
| Тип интерфейса | 1 parallel bus interface |
| Напряжение питания | 5 V |
| Максимальная тактовая частота | 0.032 MHz |
| Number of Terminals | 28 terminals |
| Package Type | 28-pin TSSOP |
| Package Width | 0.173 inch |
| Package Width Metric | 4.40 mm |
| Диапазон рабочих температур | 0 °C to 70 °C |
| Temperature Grade | Commercial grade |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| Interrupt Capability | Supported |
| Calendar Compliance | Y2K-compliant |
| Alarm Function | 1 alarm function |
| Daylight Saving | Supported |
| Leap Year Handling | Supported |
| Supervisor Function | 1 CPU supervisor function |
| Watchdog Timer | Supported |
| External NVSRAM Control | Supported |
| Тип монтажа | Surface mount |
Руководство по цоколевке BQ4802YPWRG4 в корпусе rectangular
Цоколевка для BQ4802YPWRG4 (корпус rectangular). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для BQ4802YPWRG4.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
BQ4802YPWRG4 подходит для 6 применениеs: Embedded Industrial Controller, Data-Acquisition Equipment, Copier and Printer Control, Telecommunications Network Equipment, Test and Measurement Instrument, Battery-Backed Security and Access Controller.
Embedded Industrial Controller
The BQ4802YPWRG4 fits an embedded controller that needs continuous time-of-day and calendar data alongside system supervision. Its parallel interface supports connection to a host processor, while the integrated CPU supervisor and watchdog timer provide monitoring functions that would otherwise require additional devices. The verified commercial-temperature range is 0 °C to 70 °C, making it appropriate for controlled indoor equipment. The 28-pin TSSOP package also suits compact controller boards, although designers must preserve adequate pin clearance and route the clock and supervisor signals according to the manufacturer layout guidance.
Рекомендуется
Data-Acquisition Equipment
The BQ4802YPWRG4 provides a time base for data-acquisition systems that must timestamp measurement sequences, schedules logging intervals, and record operating events. The parallel real-time clock provides clock-and-calendar information, while the alarm and interrupt capability allow a processor to react to scheduled activity without continuous polling. The 5 V supply matches systems that already operate from a conventional 5 V rail. Before implementation, verify oscillator accuracy and noise behavior in the manufacturer datasheet, and place decoupling and clock-routing components according to the reference design.
Рекомендуется
Copier and Printer Control
The BQ4802YPWRG4 is suitable for copier, printer, and office-equipment control boards that require date-stamped job records and scheduled maintenance timing. Its Y2K-compliant clock-and-calendar function, alarm support, and leap-year handling support long-duration administrative logging. The CPU supervisor and watchdog timer add useful monitoring for a processor-based mechanism, while external NVSRAM control can coordinate retained configuration data. The verified 0 °C to 70 °C range suits typical indoor environments. Firmware should verify daylight-saving behavior and alarm interrupt polarity before relying on repeated annual scheduling.
Рекомендуется
Telecommunications Network Equipment
The BQ4802YPWRG4 can support telecommunications and network-equipment modules requiring an independent real-time clock for event history and administrative timestamps. Its parallel interface suits legacy or parallel-bus processor designs, and the interrupt function allows efficient event notification. The integrated supervisor helps maintain controlled system behavior, although network equipment commonly has specialized redundancy and timing requirements that must be checked separately. The verified operating range of 0 °C to 70 °C limits the standard part to appropriate indoor environments; outdoor deployments require a suitable extended-temperature alternative.
Рекомендуется
Test and Measurement Instrument
The BQ4802YPWRG4 is useful in test and measurement instruments where records must carry accurate calendar information and operators need scheduled prompts or automated actions. The real-time clock supports time-of-day tracking, the alarm can initiate an event, and the interrupt capability reduces the need for continuous host polling. The parallel bus is appropriate for instrument-control processors that expose a parallel peripheral interface. Designers should evaluate crystal or oscillator implementation, calibration method, and grounding from the manufacturer datasheet, because those details directly influence long-term timing performance in precision equipment.
Рекомендуется
Battery-Backed Security and Access Controller
The BQ4802YPWRG4 can support access-control and security equipment that logs events using calendar timestamps and monitors its embedded processor through the integrated CPU supervisor. The watchdog timer provides an additional recovery mechanism, while alarm and interrupt outputs let the controller report scheduled or exceptional conditions. Its parallel interface is suitable for controller platforms using a parallel peripheral bus. The standard 5 V part is specified for 0 °C to 70 °C, so enclosure temperature monitoring is important. For retained security data, coordinate the RTC's external NVSRAM control and backup-power design with the complete system power-loss sequence.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для BQ4802YPWRG4 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | BQ4802YPW | BQ4802YPWR |
|---|---|---|---|
| Package | 28-pin TSSOP, 0.173 inch width | 28-pin TSSOP candidate; exact suffix must be confirmed | 28-pin TSSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Device Type | Parallel real-time clock and calendar IC | Parallel real-time clock | Parallel real-time clock |
Ключевые отличия
- Combines timekeeping and system monitoring (против BQ4802YPW)
- Exact 28-pin TSSOP source configuration (против BQ4802YPW)
- Commercial-temperature operating range is stated (против BQ4802YPW)
Заметки по проектированию
Confirm the exact 28-pin TSSOP footprint and pin numbering against the manufacturer package drawing before routing. Because BQ4802YPW can represent more than one package option, do not rely only on the family marking. Keep oscillator traces short, maintain a continuous ground reference beneath the device where the layout guidance permits, and place required crystal or oscillator components close to their assigned pins. Verify the exposed thermal requirements even though the verified data does not identify an exposed pad.
The parallel RTC interface and supervisor signals should be routed away from switching nodes and noisy timing sources. Use a solid ground plane, minimize stub lengths, and follow the manufacturer's recommended input resistor, pull-up, and filtering arrangements when they are specified. The interrupt line should be reviewed for signal-integrity margin and contention with the host processor. These precautions are particularly important in equipment containing displays, motor controls, or high-current relay stages.
Do not treat every BQ4802Y suffix as a mechanical substitute. The verified family information lists SOIC, TSSOP, and SNAPHAT package options, while BQ4802YPWRG4 is specifically identified as a 28-pin TSSOP. Before purchasing an alternative, compare the ordering table, temperature grade, lead configuration, marking scheme, and all active pin assignments. Also verify reset thresholds, watchdog behavior, interrupt polarity, and external NVSRAM timing; family membership alone does not guarantee electrical equivalence.
Информация о соответствии
The verified search data identifies a commercial-grade Texas Instruments component but does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because the listed temperature grade is commercial rather than automotive.
