BQ4802LYDWRG4 - Parallel RTC with CPU Supervisor | Texas Instruments
部品番号: BQ4802LYDWRG4 ✓ 生産中BQ4802LYDWRG4 概要
A real-time clock is a clock-and-timing semiconductor that maintains time independently of the host processor. The BQ4802LYDWRG4 belongs to the RTC and clock-and-timing IC category, where it combines a time-of-day clock, century-based calendar, and CPU supervisor functions. This integration reduces the number of separate system timing and reset components required in embedded equipment. The manufacturer identifies fax machines, copiers, industrial control systems, and point-of-sale equipment as suitable application areas.
The parallel interface provides direct connection to a processor bus, while the RTC format uses BCD and supports a YY-MM-DD-dd date representation according to the retrieved technical data. The integrated CPU supervisor adds system-monitoring value, making the device useful where an external reset, power-fail, or processor supervision function is needed alongside accurate calendar time. Its 28-pin SOIC package is identified by DigiKey as 28-SOIC with a 0.295 inch, 7.50 mm width.
The BQ4802LYDWRG4 is differentiated by combining multiple clock-and-timing functions in a single low-power peripheral. The manufacturer describes the bq4802Y and bq4802LY family as low-power microprocessor peripherals, while the available distributor listings identify the target as a parallel RTC clock/calendar with CPU supervisor capability. Exact operating-temperature, voltage tolerance, current, and battery-backup details are not included in the supplied source data and should be confirmed in the manufacturer datasheet before design release.
Typical designs place the RTC beside the host processor so that the processor can read and write calendar data over the parallel bus. The device can support time-stamped records in industrial controllers, transaction logging in point-of-sale systems, scheduling functions in office equipment, and monitoring behavior in embedded control systems. Battery-backed operation, where required by the target architecture, must be implemented according to the manufacturer’s recommended backup and power-fail circuitry.
Designers should verify the package pinout and the bq48SH-28x6 backup-module requirements for designs using the SNAPHAT option before layout release. The target ordered part is the SOIC package variant, so the footprint and pin numbering must be matched to the 28-SOIC drawing rather than the TSSOP or SNAPHAT configurations. Decoupling, battery-connection, and supervisor-reset layout should follow the manufacturer datasheet to avoid clock, reset, or power-fail integration errors.
This product page consolidates the verified manufacturer product-page description, distributor package and interface information, source timestamps, same-package replacement candidates, and practical selection guidance. It distinguishes documented parameters from unavailable details, helping engineers identify whether the BQ4802LYDWRG4 is suitable for a parallel RTC design before requesting a detailed quote or beginning PCB layout.
ドロップイン代替品: BQ4802LYDWRG4 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: BQ4802LYDWRG4 （同一形状・フットプリント） — 相違点: Package, Device Type, Package Width, Supply Voltage, Calendar Capability.
BQ4802LYDWR
✅ ドロップイン価格はお問い合わせください
データシートを見る →BQ4802YDWR
✅ ドロップイン価格はお問い合わせください
データシートを見る →BQ4802LYDWRG4 仕様
| Device Type | Parallel real-time clock (RTC) with CPU supervisor |
| 電源電圧 | 3.3 V |
| Clock Frequency | 0.032 MHz |
| インターフェースタイプ | Parallel |
| Clock IC Type | Real Time Clock / Clock Calendar |
| Clock Format | BCD |
| Date Format | YY-MM-DD-dd |
| ピン数 | 28 pins |
| Number of Terminations | 28 terminations |
| パッケージ | 28-SOIC (0.295 inch, 7.50 mm width) |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| Temperature Grade | Commercial |
| Integrated Functions | Time-of-day clock, century-based calendar, CPU supervisor |
| Calendar Capability | Century-based calendar |
BQ4802LYDWRG4 rectangular ピン配置ガイド
BQ4802LYDWRG4 (rectangular パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: BQ4802LYDWRG4.
詳細は データシート をご参照ください。
主な用途
BQ4802LYDWRG4 の用途: 6 件s: Industrial Control Systems, Point-of-Sale Equipment, Fax and Copier Control Boards, Embedded Processor Timing, Power-Fail-Aware Data Logging, Scheduled Equipment Control.
Industrial Control Systems
The BQ4802LYDWRG4 fits industrial control systems that require time stamping, scheduled operations, and processor supervision. Its parallel interface allows the host controller to access the RTC using dedicated bus signals, while the 3.3 V supply aligns with conventional embedded control platforms. The integrated century-based calendar is useful for equipment that must retain a valid date across power interruptions or operator changes. The 28-SOIC package supports a conventional surface-mount layout, but the exact pinout, voltage limits, and backup-battery implementation must be confirmed from the manufacturer datasheet before schematic release.
おすすめ
Point-of-Sale Equipment
The BQ4802LYDWRG4 is appropriate for point-of-sale equipment where transaction records need a reliable calendar and time-of-day reference. The device provides a parallel RTC interface, BCD clock format, and a YY-MM-DD-dd date representation, supporting structured timekeeping in embedded controllers. Its 3.3 V operating designation is consistent with many compact commercial systems. The CPU supervisor function can complement system monitoring, although the available verified data does not specify the exact supervisor thresholds, reset timing, or battery-life requirements. Those details should be checked against the manufacturer datasheet before deployment.
おすすめ
Fax and Copier Control Boards
The BQ4802LYDWRG4 can support timekeeping in fax machines and copiers, which are identified by Texas Instruments as target applications for the bq4802Y/bq4802LY family. A parallel RTC allows the equipment controller to maintain calendar information and stamp jobs or maintenance events. The 28-SOIC package and 3.3 V supply are suitable for an embedded legacy-control architecture where a parallel bus is already present. The commercial temperature grade shown in the retrieved distributor data should be checked against the actual copier environment, and the backup-power circuit must follow the manufacturer’s recommended configuration.
おすすめ
Embedded Processor Timing
The BQ4802LYDWRG4 is useful when a microcontroller-based product needs a separate, processor-accessible time source rather than deriving time from an unreliable system counter. The parallel interface, 3.3 V supply, and low-power RTC positioning suit embedded control boards with a dedicated bus and stable backup-power architecture. The CPU supervisor provides a second system-management function alongside time-of-day and century-based calendar tracking. Because the verified excerpts do not specify oscillator accuracy, supply-current consumption, or exact supervisor limits, engineers should validate those parameters in the manufacturer datasheet and prototype the backup-power path.
おすすめ
Power-Fail-Aware Data Logging
The BQ4802LYDWRG4 can be incorporated into equipment that records system events and needs a consistent calendar reference around power transitions. Its century-based calendar and CPU supervisor functions are intended for embedded systems that require both time-of-day information and processor monitoring. The 28-SOIC package permits integration into an existing through-hole-compatible or mixed-technology control board, while the parallel interface supports direct host-controller access. Designers should confirm backup-source current, power-fail timing, and reset behavior from the manufacturer datasheet before using the device in a safety- or data-integrity-critical logging path.
おすすめ
Scheduled Equipment Control
The BQ4802LYDWRG4 supports scheduled equipment control by providing a host processor with calendar and time-of-day data over a parallel interface. It can be used in controllers that need recurring operating windows, maintenance timestamps, or event sequencing. The BCD clock format and YY-MM-DD-dd date representation are explicitly identified in the retrieved technical data, making the device appropriate for systems that prefer direct numeric calendar access. Its 28-SOIC package and 3.3 V operating designation simplify integration into established embedded boards. Exact timing accuracy, oscillator behavior, and supervisor response should be verified before the schedule logic is finalized.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: BQ4802LYDWRG4 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | BQ4802LYDWR | BQ4802YDWR |
|---|---|---|---|
| Package | 28-SOIC (0.295 inch, 7.50 mm width) | 28-SOIC - same package family | 28-SOIC - same package family |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
主な差別化要因
- Parallel RTC with integrated CPU supervision （vs BQ4802LYDWR)
- Documented 3.3 V and 0.032 MHz operating identifiers （vs BQ4802YDWR)
- Explicit 28-SOIC commercial package configuration （vs BQ4802LYDWR)
設計ノート
Verify the physical 28-SOIC footprint and pin numbering against the BQ4802LY datasheet before routing. The target is not the TSSOP or SNAPHAT configuration; the manufacturer states that the SNAPHAT option requires the bq48SH-28x6 two-piece module. Keep the parallel-bus traces short and place the device near the host processor interface to minimize bus-timing and routing sensitivity.
The verified source data confirms a 3.3 V supply designation but does not provide the permitted supply range, operating current, or backup-cell current. Do not size the backup supply or regulator from the available information alone. Use the manufacturer recommended power-fail and backup circuitry, and confirm startup current, leakage, and supply tolerance in the datasheet before production release.
The BQ4802LYDWRG4 uses a parallel interface, so the host bus timing and pin states must be checked against the device specifications. Confirm read/write control behavior, address or chip-select requirements, and available clock timing margins from the datasheet. Avoid relying on the distributor summaries for setup time, hold time, or output-valid timing, because those values are not included in the verified data.
Do not substitute the BQ4802LYDWRG4 with a TSSOP or SNAPHAT variant without changing the PCB footprint and backup-module design. The retrieved family information explicitly distinguishes 28-pin SOIC, TSSOP, and SNAPHAT options. Also do not assume that a same-package ordering suffix guarantees identical temperature, qualification, or lifecycle status; verify the complete ordering code.
コンプライアンス情報
The supplied verified web data confirms the manufacturer, family function, package, interface, supply designation, clock frequency, commercial temperature grade, and source URLs. It does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements; these fields remain unknown.
