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ISL12022MA

更新时间： 2024-12-01 05:39:39
品牌 Logo 应用领域
英特矽尔 - INTERSIL 电池温度补偿静态存储器
页数 文件大小 规格书
29页 860K
描述
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving

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ISL12022MA 数据手册

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Low Power RTC with Battery Backed SRAM,  
Integrated ±5ppm Temperature Compensation and  
Auto Daylight Saving  
ISL12022MA  
Features  
• Embedded 32.768kHz Quartz Crystal in the Package  
The ISL12022MA device is a low power real time clock  
(RTC) with an embedded temperature sensor and  
crystal. Device functions include oscillator compensation,  
clock/calendar, power fail and low battery monitors,  
brownout indicator, one-time, periodic or polled alarms,  
intelligent battery backup switching, Battery Reseal™  
function and 128 bytes of battery-backed user SRAM.  
The device is offered in a 20 Ld SOIC module that  
contains the RTC and an embedded 32.768kHz quartz  
crystal. The calibrated oscillator provides less than ±5ppm  
drift over the full -40°C to +85°C temperature range.  
• 20 Ld SOIC Package (for DFN version, refer to the  
ISL12020M)  
• Calendar  
• On-chip Oscillator Temperature Compensation  
• 10-bit Digital Temperature Sensor Output  
• 15 Selectable Frequency Outputs  
• Interrupt for Alarm or 15 Selectable Frequency  
Outputs  
• Automatic Backup to Battery or Supercapacitor  
The RTC tracks time with separate registers for hours,  
minutes, and seconds. The calendar registers track date,  
month, year and day of the week and are accurate  
through 2099, with automatic leap year correction.  
• V  
DD  
and Battery Status Monitors  
• Battery Reseal™ Function to Extend Battery Shelf Life  
• Power Status Brownout Monitor  
• Time Stamp for Battery Switchover  
Daylight Savings time adjustment is done automatically,  
using parameters entered by the user. Power fail and  
battery monitors offer user-selectable trip levels. The  
time stamp function records the time and date of  
• 128 Bytes Battery-Backed User SRAM  
2
• I C-Bus™  
• RoHS Compliant  
switchover from V  
to V  
power, and also from V  
DD  
BAT  
BAT  
to V  
DD  
power.  
Applications  
• Utility Meters  
The ISL12022MA features enhanced immunity to ESD  
per the IEC61000-4-2 standard, and also provides  
improved resistance to system leakage related to  
environmental moisture.  
• POS Equipment  
• Printers and Copiers  
• Digital Cameras  
Related Literature  
• See TB484 “ISL12022MA Enhanced RTC Module”  
• See AN1549 “Addressing Power Issues in Real Time  
Clock Applications”  
Typical Application Circuit  
Performance Curve  
OSCILLATOR ERROR vs TEMPERATURE  
5
1
2
3
4
5
20  
19  
18  
17  
16  
GND  
GND  
GND  
GND  
GND  
NC  
4
3
2
1
GND  
GND  
NC  
3.3V  
NC  
C1  
0.1µF  
SCHOTTKY DIODE  
BAT54  
6
7
15  
14  
R1 R2 R3  
10k 10k 10k  
V
= 5.5V  
BAT  
NC  
NC  
0
-1  
-2  
-3  
-4  
-5  
V
V
DD  
BAT  
8
9
13  
12  
11  
BATTERY  
3.0V  
C2  
0.1µF  
VDO  
SCL  
GND IRQ/F  
V
= 2.7V  
OUT  
DD  
60  
MCU  
INTERFACE  
NC  
SCL  
10  
NC  
SDA  
SDA  
GND  
V
= 3.3V  
DD  
ISL12022MA  
IRQ/F  
OUT  
-40  
-20  
0
20  
40  
80  
TEMPERATURE (°C)  
July 9, 2010  
FN7575.1  
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.  
2
I C Bus is a registered trademark owned by NXP Semiconductors Netherlands, B.V.  
Copyright Intersil Americas Inc. 2010. All Rights Reserved.  
All other trademarks mentioned are the property of their respective owners.  
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