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Renesas Electronics Components Datasheet

ISL12022 Datasheet

Low Power RTC

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DATASHEET
ISL12022
Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation
±5ppm with Auto Daylight Saving
FN6659
Rev 3.00
Nov 22, 2011
The ISL12022 device is a low power real time clock with an
embedded Temp sensor for oscillator compensation,
clock/calendar, power fail, low battery monitor, brownout
indicator, single periodic or polled alarms, intelligent
battery-backup switching, Battery Reseal™ function and
128 bytes of battery-backed user SRAM.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for
hours, minutes, and seconds. The device has calendar
registers for date, month, year and day of the week. The
calendar is 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. A time stamp
function records the time and date of switchover from VDD to
VBAT power, and also from VBAT to VDD power.
Applications
• Utility Meters
• POS Equipment
• Medical Devices
• Security Systems
• Vending Machines
• White Goods
• Printers and Copiers
Features
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes and Seconds
- Day of the Week, Day, Month and Year
• On-chip Oscillator Compensation Over the Operating
Temperature Range
- ±5ppm Over -40°C to +85°C
• 10-bit Digital Temperature Sensor Output
- ±2°C Accuracy
• Customer Programmable Day Light Saving Time
• 15 Selectable Frequency Outputs
• 1 Alarm
- Settable to the Second, Minute, Hour, Day of the Week,
Day, or Month
- Single Event or Pulse Interrupt Mode
• Battery Reseal™ Function to Extend Battery Shelf Life
• Automatic Backup to Battery or Super Capacitor
- Operation to VBAT = 1.8V
- 1.0µA Battery Supply Current
• Battery Status Monitor
- 2 User Programmable Levels
- Seven Selectable Voltages for Each Level
• Power Status Brownout Monitor
- Six Selectable Trip Levels, from 2.295V to 4.675V
• Oscillator Failure Detection
• Time Stamp for First VDD to VBAT, and Last VBAT to VDD
• 128 Bytes Battery-Backed User SRAM
• I2C Bus™
- 400kHz Clock Frequency
• 1µA Typical Battery Current
• Pb-Free (RoHS Compliant)
VDD = 2.7V
TO 5.5V
CIN
0.1µF
ISL12022
VDD VBAT
GND
JBAT
DBAT
BAT43W
CBAT
0.1µF
+ VBAT = 1.8V
TO 3.2V
FIGURE 1. TYPICAL APPLICATION CIRCUIT
FN6659 Rev 3.00
Nov 22, 2011
Page 1 of 29


Renesas Electronics Components Datasheet

ISL12022 Datasheet

Low Power RTC

No Preview Available !

ISL12022
Block Diagram
SDA
SCL
SDA
BUFFER
SCL
BUFFER
I2C
INTERFACE
CONTROL
LOGIC
REGISTERS
X1
X2
VDD
VTRIP
VBAT
GND
CRYSTAL
OSCILLATOR
RTC
DIVIDER
POR
FREQUENCY
OUT
SWITCH
INTERNAL
SUPPLY
TEMPERATURE
SENSOR
FREQUENCY
CONTROL
ALARM
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
USER
SRAM
IRQ/FOUT
Pin Configuration
ISL12022
(8 LD SOIC)
TOP VIEW
X1
X2
VBAT
GND
1
2
3
4
8 VDD
7 IRQ/FOUT
6 SCL
5 SDA
Pin Descriptions
PIN # SYMBOL
DESCRIPTION
1 X1 Crystal Input. The X1 pin is the input of an inverting
amplifier and is intended to be connected to one pin of
an external 32.768kHz quartz crystal. X1 can also be
driven directly from a 32.768kHz source.
2 X2 Crystal Output. The X2 pin is the output of an inverting
amplifier and is intended to be connected to one pin of
an external 32.768kHz quartz crystal. X2 should be left
open when X1 is driven from external source.
3 VBAT Backup Supply. This input provides a backup supply
voltage to the device. VBAT supplies power to the device
in the event that the VDD supply fails. This pin should
be tied to ground if not used.
4 GND Ground.
5 SDA Serial Data. SDA is a bi-directional pin used to transfer
serial data into and out of the device. It has an open
drain output and may be wire OR’ed with other open
drain or open collector outputs.
6 SCL Serial Clock. The SCL input is used to clock all serial
data into and out of the device.
7 IRQ/FOUT Interrupt Output/Frequency Output. Multi-functional
pin that can be used as interrupt or frequency output
pin. The function is set via the configuration register. It
is an open-drain output.
8 VDD Power Supply.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
VDD RANGE
(V)
TEMP RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL12022IBZ
12022 IBZ
2.7 to 5.5
-40 to +85
8 Ld SOIC
M8.15
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL12022. For more information on MSL please see tech brief TB363.
FN6659 Rev 3.00
Nov 22, 2011
Page 2 of 29


Part Number ISL12022
Description Low Power RTC
Maker Renesas
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ISL12022 Datasheet PDF






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