ISL12022MIBZ-T7A Datasheet, PDF (1/31 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
ISL12022M
The ISL12022M 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.
Backup battery current draw is less than 1.6µA over the
temperature range. 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 V_DD to V_BAT power, and
also from V_BAT to V_DD power.
Related Literature
• 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
• V_DD 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
• 1.6µA Max Battery Current
• I²C-Bus™
• RoHS Compliant
Applications
• Utility Meters
• POS Equipment
• Printers and Copiers
• Digital Cameras
SCHOTTKY DIODE
BAT54
BATTERY
3.0V
C2
0.1µF
1 _NC
NC ²⁰
2 _NC
NC ¹⁹
3 _NC
NC ¹⁸
4 _NC
NC ¹⁷
5 _NC
NC ¹⁶
6 _{GND GND} 15
7 _VBAT
8 _GND
9 _NC
10 _NC
V_DD ¹⁴
IRQ/ ¹³
F_{OUT 12}
SCL
SDA ¹¹
ISL12022M
3.3V
C1
0.1µF
R1 R2 R3
10k 10k 10k
V_DD
SCL MCU
INTERFACE
SDA
GND
IRQ/F_OUT
FIGURE 1. TYPICAL APPLICATION CIRCUIT
5
4
3
2
1
0
V_BAT = 5.5V
-1
-2
V_DD = 2.7V
-3
V_DD = 3.3V
-4
-5
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 2. OSCILLATOR ERROR vs TEMPERATURE
June 20, 2012
FN6668.9
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. 2008-2012. All Rights Reserved
Intersil (and design) and Battery Reseal are trademarks owned by Intersil Corporation or one of its subsidiaries. I²C Bus is a trademark
owned by NXP Semiconductors Netherlands, B.V. All other trademarks mentioned are the property of their respective owners.