參數(shù)資料
型號(hào)： BQ4285EQN
廠商： TEXAS INSTRUMENTS INC
元件分類： XO, clock
英文描述： 1 TIMER(S), REAL TIME CLOCK, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 22/30頁(yè)
文件大?。?/td> 1497K
代理商： BQ4285EQN
file:///G|/imaging/BITTING/cpl_rework/bq4285l.html
BQ4285L, RTC IC With 114x8 NVSRAM and NVSRAM Control, Alarm Wake-up 3V Op on L Version
DEVICE STATUS: ACTIVE
PARAMETER NAME
BQ4285L
Supply Voltage (V)
3
Bus Interface
Multiplexed
Memory Density (Kb) 0.114
Integrated CPU Supv No
FEATURES
q
Direct clock/calendar replacement for IBM AT-compatible computers and other applications
q
114 bytes of general nonvolatile storage
q
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)
- 32kHz output for power management
q
Automatic backup and write-protect control to external SRAM
q
Functionally compatible with the DS1285
q
Less than 0.5uA load under battery operation
q
Selectable Intel or Motorola bus timing (PLCC), Intel bus timing (DIP and SOIC)
q
14 bytes for clock/calendar and control
q
BCD or binary format for clock and calendar data
q
Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
q
Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
q
Programmable square wave out-put
q
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
q
24-pin plastic DIP or SOIC
DESCRIPTION
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. The only
file:///G|/imaging/BITTING/cpl_rework/bq4285l.html (1 of 2) [May-09-2002 4:40:17 PM]
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ4285ES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
BQ4285L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced RTC With NVRAM Control
BQ4285LP 制造商:TI 制造商全稱:Texas Instruments 功能描述:Enhanced RTC With NVRAM Control
BQ4285LQ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
BQ4285LS 制造商:Rochester Electronics LLC 功能描述:- Bulk
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