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Renesas Electronics Components Datasheet

ISL1221 Datasheet

Low Power RTC

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DATASHEET
ISL1221
Low Power RTC with Battery Backed SRAM and Event Detection
FN6316
Rev 1.00
July 15, 2010
The ISL1221 device is a low power real time clock with
Event Detect and Time Stamp function, timing and crystal
compensation, clock/calendar, power fail indicator, periodic
or polled alarm, intelligent battery backup switching with
separate FOUT output and 2 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.
Ordering Information
PART
NUMBER
(Note)
PART
VDD
MARKING RANGE
TEMP
RANGE
(°C)
PACKAGE
(Pb-Free)
ISL1221IUZ 1221Z
2.7V to 5.5V -40 to +85 10 Ld MSOP
ISL1221IUZ-T* 1221Z
2.7V to 5.5V -40 to +85 10 Ld MSOP
Tape and Reel
*Please refer to TB347 for details on reel specifications.
NOTE: 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.
Pinout
ISL1221
(10 LD MSOP)
TOP VIEW
X1 1
X2 2
VBAT 3
GND 4
EVIN 5
10 VDD
9 IRQ/EVDET
8 SCL
7 SDA
6 FOUT
Features
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes, and Seconds
- Day of the Week, Day, Month, and Year
• Security and Event Functions
- Tamper detection with Time Stamp in Normal and
Battery Backed modes
- Event Detection During Battery Backed or Normal
Modes
- Selectable Event Input Sampling Rates Allows Low
Power Operation
- Selectable Glitch Filter on Event Input Monitor
• Separate FOUT pin with 15 Selectable Frequencies
• Single Alarm
- Settable to the Second, Minute, Hour, Day of the Week,
Day, or Month
- Single Event or Pulse Interrupt Mode
• Automatic Backup to Battery or Super Cap
• Power Failure Detection
• On-Chip Oscillator Compensation
• 2 Bytes Battery-Backed User SRAM
• I2C Interface
- 400kHz Data Transfer Rate
• 400nA Battery Supply Current
• Small Package
- 10 Ld MSOP
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters
• Set Top Box/Modem
• POS Equipment
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Test Meters/Fixtures
• Vending Machine Management
• Security and Anti Tampering Applications
- Panel/Enclosure Status
- Warranty Reporting
- Time Stamping Applications
- Patrol/Security Check (Fire or Light Equipment)
- Automotive Applications
FN6316 Rev 1.00
July 15, 2010
Page 1 of 24


Renesas Electronics Components Datasheet

ISL1221 Datasheet

Low Power RTC

No Preview Available !

ISL1221
Block Diagram
SDA
SCL
SDA
BUFFER
SCL
BUFFER
I2C
INTERFACE
CONTROL
LOGIC
X1
X2
VDD
VTRIP
VBAT
CRYSTAL
OSCILLATOR
RTC
DIVIDER
POR
FREQUENCY
OUT
SWITCH
INTERNAL
SUPPLY
ALARM
EVIN
GND
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
CONTROL
REGISTERS
USER
SRAM
IRQ/
EVDET
FOUT
Pin Descriptions
PIN
NUMBER
SYMBOL
DESCRIPTION
1 X1 X1. 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 X2. 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
VBAT. 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
EVIN
Event Input (EVIN). The EVIN is an input pin that is used to detect an externally monitored event. When a high signal
is present at the EVIN pin an “event” is detected.
6 FOUT Frequency Output FOUT, Frequency output pin, 15 selectable frequencies. Open drain output.
7
SDA
Serial Data (SDA). SDA is a bidirectional 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.
8 SCL Serial Clock (SCL). The SCL input is used to clock all serial data into and out of the device.Open drain output.
9 IRQ/EVDET Interrupt (IRQ)/Event Detect (EVDET) Output. Multi-functional pin that can be used as interrupt for Alarm and Event
Detect. Open Drain Output.
10
VDD
VDD. Power supply.
FN6316 Rev 1.00
July 15, 2010
Page 2 of 24


Part Number ISL1221
Description Low Power RTC
Maker Renesas
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ISL1221 Datasheet PDF






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