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Renesas Electronics Components Datasheet

ISL12022MA Datasheet

Low Power RTC

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DATASHEET
ISL12022MA
Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature
Compensation and Auto Daylight Saving
FN7575
Rev 5.00
September 5, 2012
The ISL12022MA 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 VDD to VBAT power, and
also from VBAT to VDD power.
The ISL12022MA features enhanced immunity to ESD per the
IEC61000-4-2 standard, and also provides improved resistance
to system leakage related to environmental moisture.
Related Literature
• See TB484 “ISL12022MA Enhanced RTC Module”
• 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
• 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
• 1.6µA Max Battery Current
• I2C Bus™
• RoHS Compliant
Applications
• Utility Meters
• POS Equipment
• Printers and Copiers
• Digital Cameras
1 GND
GND 20
2 GND
GND 19
3 GND
4 NC
GND 18
NC 17
3.3V
SCHOTTKY DIODE
BAT54
BATTERY
3.0V
C2
0.1µF
5 NC
6 NC
7 VBAT
8 GND
9 NC
NC 16
NC 15
VDD 14
IRQ/FOUT 13
SCL 12
C1
0.1µF
R1 R2 R3
10k 10k 10k
10 NC
SDA 11
ISL12022MA
VDO
SCL
MCU
SDA INTERFACE
GND
IRQ/FOUT
FIGURE 1. TYPICAL APPLICATION CIRCUIT
FN7575 Rev 5.00
September 5, 2012
Page 1 of 31


Renesas Electronics Components Datasheet

ISL12022MA Datasheet

Low Power RTC

No Preview Available !

ISL12022MA
Block Diagram
SDA
SCL
SDA
BUFFER
SCL
BUFFER
I2C
INTERFACE
CONTROL
LOGIC
REGISTERS
CRYSTAL
OSCILLATOR
RTC
DIVIDER
VDD
VBAT
VTRIP
+-
GND
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
GND
GND
GND
NC
NC
NC
VBAT
GND
NC
NC
ISL12022MA
(20 LD SOIC)
TOP VIEW
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
GND
GND
GND
NC
NC
NC
VDD
IRQ/FOUT
SCL
SDA
Pin Descriptions
PIN NUMBER
4, 5, 6, 9, 10,
15, 16, 17
7
11
12
SYMBOL
NC
DESCRIPTION
No Connection. Do not connect to a signal or supply voltage.
VBAT
SDA
SCL
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 can be connected to a battery, a supercapacitor or tied to ground if not used. See the
Battery Monitor parameter in the “” table on page 6. This pin should be tied to ground if not used.
Serial Data. SDA is a bi-directional pin used to transfer data into and out of the device. It has an open drain output and
may be OR’ed with other open drain or open collector outputs. The input buffer is always active (not gated) in normal
mode.
An open drain output requires the use of a pull-up resistor. The output circuitry controls the fall time of the output signal
with the use of a slope controlled pull-down. The circuit is designed for 400kHz I2C interface speeds. It is disabled when
the backup power supply on the VBAT pin is activated.
Serial Clock. The SCL input is used to clock all serial data into and out of the device. The input buffer on this pin is always
active (not gated). It is disabled when the backup power supply on the VBAT pin is activated to minimize power
consumption.
FN7575 Rev 5.00
September 5, 2012
Page 2 of 31


Part Number ISL12022MA
Description Low Power RTC
Maker Renesas
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ISL12022MA Datasheet PDF






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