參數(shù)資料
型號(hào)： BQ3285EQ
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> 1097K
代理商： BQ3285EQ
Product Folder: BQ3285E, RTC IC with 242x8 NVSRAM Alarm Wake-up 3V Op on L Version
BQ3285E, RTC IC with 242x8 NVSRAM Alarm Wake-up 3V Op on L Version
DEVICE STATUS: ACTIVE
PARAMETER NAME
BQ3285E
Supply Voltage (V)
5
Bus Interface
Multiplexed
Memory Density (Kb) 0.242
Integrated CPU Supv No
FEATURES
q
Direct clock/calendar replacement for IBM AT-compatible computers and other applications
q
Functionally compatible with the DS1285
- Closely matches MC146818A pin configuration
q
2.7–3.6V operation (bq3285L);
4.5–5.5V operation (bq3285E)
q
242 bytes of general nonvolatile storage
q
32.768kHz output for power management
q
System wake-up capability—alarm interrupt output active in battery-backup mode
q
Less than 0.5uA load under battery operation
q
Selectable Intel or Motorola bus timing
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 output
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, SOIC, or SSOP (industrial SSOP only)
DESCRIPTION
The CMOS bq3285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with
alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable
interrupt sources, square-wave output, and 242 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 bq3285E/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 bq3285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only
external components are a 32.768kHz crystal and a backup battery.
file:///G|/imaging/BITTING/cpl_rework/bq3285e.html (1 of 2) [May-09-2002 4:34:39 PM]
相關(guān)PDF資料
PDF描述
BQ3285LCS 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285ECS 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285LDSSTRG4 REAL TIME CLOCK, PDSO24
BQ3285LDSS 0 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285EDSS 0 TIMER(S), REAL TIME CLOCK, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ3285EQ- 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC
BQ3285EQN 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC
BQ3285ES 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
BQ3285ES- 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC
BQ3285ESG4 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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