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Renesas Electronics Components Datasheet

ISL12023 Datasheet

Low Power RTC

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ISL12023
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DATASHEET
FN6682
Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation
Rev 3.00
±5ppm with Auto Daylight Saving
December 6, 2011
The ISL12023 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 Temp
Range
- ±5ppm Over -40°C to +85°C
• 10-bit Digital Temperature Sensor Output
- ±2°C Accuracy
• Customer Programmable Day Light Saving Time
• Clock Output with 15 Selectable Frequencies
• 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
• Separate FOUT, IRQ, and LVRST Outputs
• I2C Bus™
- 400kHz Clock Frequency
• 14 Ld TSSOP Package
• Pb-Free (RoHS Compliant)
Ordering Information
PART NUMBER
(Notes 1, 2)
PART
MARKING
VDD RANGE
(V)
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL12023IVZ
12023 IVZ
2.7 to 5.5
-40 to +85
14 Ld TSSOP
M14.173
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
FN6682 Rev 3.00
December 6, 2011
Page 1 of 29


Renesas Electronics Components Datasheet

ISL12023 Datasheet

Low Power RTC

No Preview Available !

ISL12023
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
BROWNOUT
ALARM
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
USER
SRAM
IRQ
FOUT
LVRST
Pin Configuration
ISL12023
(14 LD TSSOP)
TOP VIEW
NC
X1
X2
VBAT
GND
LVRST
NC
1
2
3
4
5
6
7
14 NC
13 VDD
12 IRQ
11 SCL
10 SDA
9 FOUT
8 NC
Pin Descriptions
PIN
NUMBER SYMBOL
DESCRIPTION
1, 7, 8, 14 NC No connect. Do not connect.
2 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.
3 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.
4 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.
5 GND Ground.
6 LVRST Low Voltage Reset pin for VCC Brownout Mode.
Open drain configuration
9 FOUT Frequency Output. Frequency selectable through
Control Register. Open drain configuration.
10 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.
11 SCL Serial Clock. The SCL input is used to clock all
serial data into and out of the device.
12 IRQ Interrupt Output. Provides active low interrupt
signal. Open drain configuration.
13 VDD Power Supply.
FN6682 Rev 3.00
December 6, 2011
Page 2 of 29


Part Number ISL12023
Description Low Power RTC
Maker Renesas
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ISL12023 Datasheet PDF






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