BQ4847 具有 NVSRAM 控制、看门狗定时器、上电复位、中断电池低电警告的 RTC
BQ4847 描述
The bq4847 Real-Time Clock Module is a low-power microprocessor peripheral that integrates a time-of-day clock, a 100-year calendar, a CPU supervisor, a battery, and a crystal in a 28-pin DIP module. The part is ideal for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.
The bq4847 contains an internal battery and crystal. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4847 can write-protect and make nonvolatile an external SRAM. The backup cell powers the real-time clock and maintains SRAM information in the absence of system voltage.
The bq4847 contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply
|
BQ4847 |
BQ4847Y |
| Supply Voltage(V) |
5 |
5 |
| Bus Interface |
Parallel |
Parallel |
| Operating Temperature Range(°C) |
0 to 70 |
0 to 70 |
| Pin/Package |
28DIP MODULE |
28DIP MODULE |
| Approx. Price (US$) |
6.65 | 1ku |
6.65 | 1ku |
| RTC Bytes |
16 |
16 |
BQ4847 特性
- Real-Time Clock counts seconds through years in BCD format
- Integrated battery and crystal
- On-chip battery-backup switch-over circuit with nonvolatile control for an external SRAM
- 130mAh battery capacity
- ±1 minute per month clock accuracy
- Less than 500nA of clock operation current in backup mode
- Microprocessor reset valid to VCC=VSS
- Independent watchdog timer with a programmable time-out period
- Power-fail interrupt warning
- Programmable clock alarm interrupt active in battery-backup mode
- Programmable periodic interrupt
- Battery-low warning
BQ4847 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 |
| BQ4847MT |
ACTIVE |
0 to 70 |
6.65 | 1ku |
DIP MODULE (MT) | 28 |
13 |
|
BQ4847 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 |
| BQ4847MT |
Pb-Free (RoHS) |
Call TI |
N/A for Pkg Type |
BQ4847MT |
BQ4847MT |
BQ4847 应用技术支持与电子电路设计开发资源下载
- BQ4847 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
- PowerPADTM 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)
- PowerPADTM 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)
BQ4847 相关工具
| 名称 |
型号 |
公司 |
工具/软件类型 |
| BQ4847 评估模块 |
BQ4847EVM |
Texas Instruments |
开发电路板/EVM |