- 制造厂商：TI
- 产品类别：时钟和计时
- 技术类目：实时时钟 (RTC) 和计时器
- 功能描述：具有 CPU 监控器和外部 NVSRAM 控制的符合 Y2K 的并行 RTC，5V Vcc
- 点击这里打开及下载BQ4802Y的技术文档资料
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The bq4802Y/bq4802LY real-time clock is a low-power microprocessor peripheral that integrates a time-of-day clock, a century-based calendar, and a CPU supervisor, with package options including a 28-pin SOIC, TSSOP, or SNAPHAT that requires the bq48SH-28x6 to complete the two-piece module. The bq4802Y/ bq4802LY is ideal for fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and computers.
The bq4802Y/bq4802LY provides direct connections for a 32.768-kHz quartz crystal and a 3-V backup battery. Through the use of the conditional chip enable output (CE\OUT) and battery voltage output (VOUT) pins, the bq4802Y/bq4802LY can write-protect and make non- volatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information the absence of system voltage. The crystal and battery are contained within the modules for a more integrated solution.
The bq4802Y/bq4802LY contains a temperature-compensated reference and comparator circuit that monitors the status of its voltage supply. When the bq4802Y/bq4802LY detects an out-of-tolerance condition, it generates an interrupt warning and subsequently a microprocessor reset. The reset stays active for 200 ms after VCC rises within tolerance, to allow for power supply and processor stabilization. The reset function also allows for an external push-button override.
- Real-Time Clock Counts Seconds Through Centuries in BCD Format
- bq4802Y: 5-V Operation
- bq4802LY: 3.3-V Operation
- On-Chip Battery-Backup Switchover Circuit With Nonvolatile Control for External SRAM
- Less Than 500 nA of Clock Operation Current in Backup Mode
- Microprocessor Reset With Push-Button Override
- Independent Watchdog Timer With Programmable Time-Out Period
- Power-Fail Interrupt Warning
- Programmable Clock Alarm Interrupt Active in Battery-Backup Mode
- Programmable Periodic Interrupt
- Battery-Low Warning
- 28-pin SOIC, TSSOP, and SNAPHAT Package Options
- APPLICATIONS
- Telecommunications Base Stations
- Servers
- Handheld Data Collection Equipment
- Medical Equipment
- Handheld Instrumentation
- Test Equipment
- Iq (Typ) (uA)
- 0.5
- Features
- External SRAM control, Integrated CPU supervisor, Parallel bus interface, 16 RTC bytes
- Rating
- Catalog
- Operating temperature range (C)
- 0 to 70
- Supply voltage (Max) (V)
- 5.5
- Supply voltage (Min) (V)
- 4.5
BQ4802Y的完整型号有：BQ4802YDW、BQ4802YDWR、BQ4802YPW，以下是这些产品的关键参数及官网采购报价：
BQ4802YDW，工作温度：0 to 70，封装：SOIC (DW)-28，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网BQ4802YDW的批量USD价格：8.661（1000+）
BQ4802YDWR，工作温度：0 to 70，封装：SOIC (DW)-28，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网BQ4802YDWR的批量USD价格：7.874（1000+）
BQ4802YPW，工作温度：0 to 70，封装：TSSOP (PW)-28，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网BQ4802YPW的批量USD价格：3.937（1000+）
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