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ISL12020MIRZ-T7A Datasheet, PDF (1/34 Pages) Intersil Corporation – Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving
Low Power RTC with Battery Backed SRAM, Integrated
±5ppm Temperature Compensation and Auto Daylight
Saving
ISL12020M
The ISL12020M 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
DFN 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.
Related Literature
• See AN1549 “Addressing Power Issues in Real Time Clock
Applications”
Features
• Embedded 32.768kHz Quartz Crystal in the Package
• 20 Ld DFN Package (for SOIC version, refer to the
ISL12022M)
• 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
SCHOTTKY DIODE
BAT54
BATTERY
3.0V
C2
0.1µF
1 X2
X1 20
2 X2
X1 19
3 X2
X1 18
4 X2
X1 17
5 X2
X1 16
6 NC
NC 15
7 VBAT
8 GND
VDD 14
IRQ/FOUT 13
9 NC
SCL 12
10 NC
SDA 11
ISL12020M
3.3V
C1
0.1µF
R1 R2 R3
10k 10k 10k
IRQ/FOUT
FIGURE 1. TYPICAL APPLICATION CIRCUIT
VDD
SCL MCU
SDA INTERFACE
GND
December 13, 2011
FN6667.5
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008-2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. I2C Bus™ is a trademark owned by
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