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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