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ISL12022MA Datenblatt(PDF) 1 Page - Intersil Corporation

Teilenummer ISL12022MA
Bauteilbeschribung  Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation and Auto Daylight Saving
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Hersteller  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12022MA Datenblatt(HTML) 1 Page - Intersil Corporation

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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
I2C 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.
Low Power RTC with Battery Backed SRAM,
Integrated ±5ppm Temperature Compensation and
Auto Daylight Saving
ISL12022MA
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.
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.
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
switchover from VDD to VBAT power, and also from VBAT
to VDD power.
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.
Related Literature
•See TB484 “ISL12022MA Enhanced RTC Module”
•See AN1549 “Addressing Power Issues in Real Time
Clock Applications”
Features
• Embedded 32.768kHz Quartz Crystal in the Package
• 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
•VDD and Battery Status Monitors
• Battery Reseal™ Function to Extend Battery Shelf Life
• Power Status Brownout Monitor
• Time Stamp for Battery Switchover
• 128 Bytes Battery-Backed User SRAM
•I2C-Bus™
• RoHS Compliant
Applications
• Utility Meters
•POS Equipment
• Printers and Copiers
•Digital Cameras
Typical Application Circuit
Performance Curve
GND
GND
GND
GND
GND
GND
GND
NC
NC
NC
NC
NC
VBAT
VDD
GND
IRQ/FOUT
NC
NC
SCL
SDA
ISL12022MA
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
SCHOTTKY DIODE
BAT54
BATTERY
3.0V
3.3V
C2
0.1µF
C1
0.1µF
R1
10k
R2
10k
R3
10k
VDO
SCL
SDA
GND
MCU
INTERFACE
IRQ/FOUT
-5
-4
-3
-2
-1
0
1
2
3
4
5
-40
-20
0
2040
6080
TEMPERATURE (°C)
VDD = 2.7V
VBAT = 5.5V
VDD = 3.3V
OSCILLATOR ERROR vs TEMPERATURE
July 9, 2010
FN7575.1


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