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ISL12021

更新时间： 2024-12-01 03:44:35
品牌 Logo 应用领域
英特矽尔 - INTERSIL 温度补偿时钟
页数 文件大小 规格书
24页 312K
描述
Real Time Clock with On Chip Temp Compensation 【5ppm

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ISL12021 数据手册

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ISL12021  
®
Real Time Clock with On Chip Temp Compensation ±5ppm  
Data Sheet  
March 30, 2007  
FN6451.0  
Low Power RTC with V  
Battery Backed  
Features  
• Real Time Clock/Calendar  
DD  
SRAM and Embedded Temp  
Compensation ±5ppm with Auto Day Light  
Saving  
- Tracks Time in Hours, Minutes and Seconds  
- Day of the Week, Day, Month and Year  
The ISL12021 device is a low power real time clock with an  
embedded Temp sensor for oscillator compensation,  
clock/calendar, power fail, low battery monitor, brown out  
indicator, single periodic or polled alarms, intelligent battery  
backup switching and 128 bytes of battery-backed user  
SRAM.  
• On-chip Oscillator Compensation Over the Operating  
Temp Range  
- ±5ppm over -20°C to +70°C  
• Day Light Saving Time  
- Customer Programmable  
• Separate F  
pin  
OUT  
The oscillator uses an external, low-cost 32.768kHz crystal.  
The real time clock tracks time with separate registers for  
hours, minutes, and seconds. The device has calendar  
registers for date, month, year and day of the week. The  
calendar is accurate through 2099, with automatic leap year  
correction.  
- 15 Selectable Frequency Outputs  
• 1 Alarm  
- Settable to the Second, Minute, Hour, Day of the Week,  
Day, or Month  
- Single Event or Pulse Interrupt Mode  
- Dedicated IRQ output pin  
Daylight Savings time adjustment is done automatically,  
using parameters entered by the user. Power fail and battery  
monitors offer user-selectable trip levels. A time stamp  
• Automatic Backup to Battery or Super Cap  
- Operation to V  
BAT  
= 1.8V  
function records the time and date of switchover from V  
to  
DD  
- 1.0µA Battery Supply Current  
battery power, and also from battery to V  
power.  
DD  
• Battery Status Monitor, 2 Levels, Selectable by Customer  
to:  
Pinout  
- Seven Selectable Voltages for Each Level  
• Power status Brown Out Monitor  
ISL12021  
(14 LD TSSOP)  
TOP VIEW  
- Six selectable trip level, from 4.675V to 2.295V  
- Separate Low Voltage LVRST pin  
1
2
3
4
5
6
7
14  
NC  
X1  
NC  
V
• Time Stamp during Power to Battery and Battery to Power  
Cross Over  
13  
12  
DD  
- Time Stamp. First V  
DD  
to V  
, and Last V  
BAT  
to V  
DD  
BAT  
IRQ  
X2  
• 128 Bytes Battery-Backed User SRAM  
V
11  
10  
SCL  
SDA  
BAT  
2
• I C Interface  
GND  
- 400kHz Clock Frequency  
9
8
F
LVRST  
NC  
OUT  
• 14 Ld TSSOP package  
NC  
• Pb-Free Plus Anneal Available (RoHS Compliant)  
Applications  
• Utility Meters  
• POS Equipment  
• Medical Application  
• Security Related Application  
• Vending Machine  
• White Goods  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright Intersil Americas Inc. 2007. All Rights Reserved  
All other trademarks mentioned are the property of their respective owners.  
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