BQ4285E RTC IC，具有 114x8 NVSRAM 和 NVSRAM 控制、针对 L 版本发出警报唤醒 3V 操作
BQ4285E 描述
The CMOS bq4285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.
A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode.
The bq4285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.
The bq4285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications.
|
BQ4285E |
| Supply Voltage(V) |
5 |
| Bus Interface |
Multiplexed |
| Memory Density(Kb) |
0.114 |
| Operating Temperature Range(°C) |
0 to 70 |
| Pin/Package |
24PDIP |
| Approx. Price (US$) |
2.90 | 1ku |
| RTC Bytes |
14 |
BQ4285E 特性
- Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
- 114 bytes of general nonvolatile storage
- Enhanced features include:
- System wake-up capability—alarm interrupt output active in battery-backup mode
- 2.7–3.6V operation (bq4285L);
4.5–5.5V operation (bq4285E)
- 2kHz output for power management
- Automatic backup and write-protect control to external SRAM
- Functionally compatible with the DS1285
- Less than 0.5µA load under battery operation
- 14 bytes for clock/calendar and control
- BCD or binary format for clock and calendar data
- Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
- Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
- Programmable square wave out-put
- Three individually maskable interrupt event flags:
- Periodic rates from 122us to 500ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
BQ4285E 芯片订购指南
| 器件 |
状态 |
温度 (oC) |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| BQ4285EP |
ACTIVE |
0 to 70 |
2.90 | 1ku |
PDIP (N) | 24 |
15 | TUBE |
4285P
-SB2 |
BQ4285E 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| BQ4285EP |
Pb-Free (RoHS) |
A42 SN |
N/A for Pkg Type |
BQ4285EP |
BQ4285EP |
BQ4285E 应用技术支持与电子电路设计开发资源下载
- BQ4285E 数据资料 dataSheet 下载.PDF
- TI 德州仪器实时时钟产品选型与价格 . xls
- PowerPAD™ Thermally Enhanced Package
(PDF 1040 KB)
- 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A)
(PDF 2206 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
- PowerPAD™ Made Easy (PDF 57 KB)
- 标准线性产品交叉参考 (Rev. D)
(PDF 1058 KB)
- 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
BQ4285E 相关工具
| 名称 |
型号 |
公司 |
工具/软件类型 |
| BQ4285E 评估模块 |
BQ4285EEVM |
Texas Instruments |
开发电路板/EVM |
