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Renesas Electronics Components Datasheet

ISL12029 Datasheet

Real Time Clock/Calendar

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DATASHEETISL12029, ISL12029A
Real Time Clock/Calendar with
I2C
Bus™
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FN6206
Rev 1.00
December 16, 2010
The ISL12029 device is a low power real time clock with
clock/calendar, power-fail indicator, clock output and crystal
compensation, two periodic or polled alarms (open drain
output), intelligent battery backup switching, CPU
Supervisor, integrated 512x8-bit EEPROM configured in 16
bytes per page.
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.
The ISL12029 and ISL12029A Power Control Settings are
different. The ISL12029 uses the Legacy Mode Setting, and
the ISL12029A uses the Standard Mode Setting.
Applications that have VBAT > VDD will require only the
ISL12029A. Please refer to “Power Control Operation” on
page 14 for more details. Also, please refer to “I2C
Communications During Battery Backup” on page 24 for
important details.
Pinout
ISL12029, ISL12029A
(14 LD TSSOP, SOIC)
TOP VIEW
X1
X2
NC
NC
NC
RESET
GND
1
2
3
4
5
6
7
14 VDD
13 VBAT
12 IRQ/FOUT
11 NC
10 NC
9 SCL
8 SDA
NC = No internal connection
Features
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes and Seconds
- Day of the Week, Day, Month and Year
- 3 Selectable Frequency Outputs
• Two Non-Volatile Alarms
- Settable on the Second, Minute, Hour, Day of the Week,
Day or Month
- Repeat Mode (periodic interrupts)
• Automatic Backup to Battery or SuperCap
- Power Failure Detection
- 800nA Battery Supply Current
• On-Chip Oscillator Compensation:
- Internal Feedback Resistor and Compensation
Capacitors
- 64 Position Digitally Controlled Trim Capacitor
- 6 Digital Frequency Adjustment Settings to ±30ppm
• 512x8 Bits of EEPROM
- 16-Byte Page Write Mode (32 total pages)
- 8 Modes of BlockLock™ Protection
- Single Byte Write Capability
- Data Retention: 50 years
- Endurance: >2,000,000 Cycles Per Byte
• CPU Supervisor Functions
- Power-On Reset, Low Voltage Sense
- Watchdog Timer (0.25s, 0.75s, 1.5s)
• I2C Interface
- 400kHz Data Transfer Rate
• 14 Ld SOIC and 14 Ld TSSOP Packages
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers/PDA
• POS Equipment
• Test Meters/Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial/Medical/AutomotivePAR
FN6206 Rev 1.00
December 16, 2010
Page 1 of 29


Renesas Electronics Components Datasheet

ISL12029 Datasheet

Real Time Clock/Calendar

No Preview Available !

ISL12029, ISL12029A
Block Diagram
32.768kHZ
X1
X2
IRQ/FOUT
SELECT
SCL
SDA
SERIAL
INTERFACE
DECODER
CONTROL
DECODE
LOGIC
8
RESET
OSC COMPENSATION
OSCILLATOR
FREQUENCY
DIVIDER
1Hz
TIMER
CALENDAR
LOGIC
TIME
KEEPING
REGISTERS
(SRAM)
CONTROL/
REGISTERS
(EEPROM)
STATUS
REGISTERS
(SRAM)
ALARM
WATCHDOG LOW VOLTAGE
TIMER
RESET
COMPARE
ALARM REGS
(EEPROM)
4k
EEPROM
ARRAY
BATTERY
SWITCH
CIRCUITRY
VDD
VBACK
Pin Descriptions
PIN
NUMBER
SYMBOL
DESCRIPTION
1 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.
2 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.
6 RESET RESET. This is a reset signal output. This signal notifies a host processor that the “Watchdog” time period has
expired or that the voltage has dropped below a fixed VTRIP threshold. It is an open drain active LOW output.
Recommended value for the pull-up resistor is 5k. If unused, connect to ground.
7
GND
Ground.
8
SDA
Serial Data (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.
9 SCL The Serial Clock (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).
12 IRQ/FOUT Interrupt Output/Frequency Output is a multi-functional pin that can be used as interrupt or frequency output pin. It
is an open drain output. The function is set via the configuration register.
13
14
3, 4, 5, 10,
11
VBAT
VDD
NC
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.
Power Supply.
No Internal Connection.
FN6206 Rev 1.00
December 16, 2010
Page 2 of 29


Part Number ISL12029
Description Real Time Clock/Calendar
Maker Renesas
PDF Download

ISL12029 Datasheet PDF






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