BQ4802YPWRG4 - Parallel RTC with CPU Supervisor | TI
料号： BQ4802YPWRG4 ✓ 量产中BQ4802YPWRG4 概述
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.
直接替换替代料： BQ4802YPWRG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： BQ4802YPWRG4 （相同外形与封装尺寸） ——差异在于 Interface Type, Package Width, Product Type, Supply Voltage.
BQ4802YPW
✅ 直接替换联系询价
查看数据手册 →BQ4802YPWR
✅ 直接替换联系询价
查看数据手册 →BQ4802YPWRG4 规格参数
| Product Type | 1 real-time clock and calendar IC |
| 接口类型 | 1 parallel bus interface |
| 电源电压 | 5 V |
| 最大时钟频率 | 0.032 MHz |
| Number of Terminals | 28 terminals |
| Package Type | 28-pin TSSOP |
| Package Width | 0.173 inch |
| Package Width Metric | 4.40 mm |
| 工作温度范围 | 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 |
| 安装类型 | Surface mount |
BQ4802YPWRG4 rectangular 引脚配置指南
BQ4802YPWRG4（rectangular 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： BQ4802YPWRG4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
BQ4802YPWRG4 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： BQ4802YPWRG4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Combines timekeeping and system monitoring （对比 BQ4802YPW)
- Exact 28-pin TSSOP source configuration （对比 BQ4802YPW)
- Commercial-temperature operating range is stated （对比 BQ4802YPW)
设计说明
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.
合规信息
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.
