1
FN6618.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL12032
Real Time Clock with 50/60 Hz clock and Crystal Backup
Low Power RTC with Battery Backed
SRAM and 50/60 Cycle AC Input and Xtal
Back-up
The ISL12032 device is a low power real time clock with
50/60 AC input for timing synchronization. It also has an
oscillator utilizing an external crystal for timing back-up,
clock/calendar registers, intelligent battery back-up
switching, battery voltage monitor, brownout indicator,
integrated trickle charger for super capacitor, single periodic
or polled alarms, POR supervisory function, and up to 4
Event Detect with time stamp. There are 128 bytes of
battery-backed user SRAM.
The oscillator uses a 50/60 cycle sine wave input, backed by
an external, low-cost, 32.768kHz crystal. The real time clock
tracks time with separate registers for hours, minutes, and
seconds. The calendar registers contain the date, month,
year, and day of the week. The calendar is accurate through
year 2100, with automatic leap year correction and auto
daylight savings correction.
Pinout
ISL12032
(14 LD TSSOP)
TOP VIEW
Features
• 50/60 Cycle AC as a Primary Clock Input for RTC Timing
• Redundant Crystal Clock Input Selectable by User
- Dynamically Switch from AC Clock Input to Crystal in
Case of Power Failure
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes, Seconds and Tenths of
a Second
- Day of the Week, Day, Month, and Year
• Auto Daylight Saving Time Correction
- Programmable Forward and Backward Dates
• Security and Event Functions
- Event Detection with Time Stamp
- Stores First and Last Three Event Time Stamps
• Separate F
OUT
Pin
- 7 Selectable Frequency Outputs
• Dual Alarms with Hardware and Register Indicators
- Hardware Single Event or Pulse Interrupt Mode
• Automatic Backup to Battery or Super Capacitor
- VBAT Operation Down to 1.8V
- 1.0µA Battery Supply Current
• Two Battery Status Monitors with Selectable Levels
- Seven Selectable Voltages for Each Level
- 1st Level, Trip Points from 4.675V to 2.125V
- 2nd Level, Trip Points from 4.125V to 1.875V
•V
DD
Power Brownout Monitor
- Six Selectable Trip Levels, from 4.675V to 2.295V
• Time Stamp during Power-to-Battery and
Battery-to-Power Switchover
• Integrated Trickle Charger
- Four Selectable Charging Rates
• 128 Bytes Battery-Backed User SRAM
•I
2
C Interface
- 400kHz Data Transfer Rate
• Pb-free (RoHS compliant)
Applications
• Utility Meters
• Control Applications
• Security Related Applications
• Vending Machines
• White Goods
• Consumer Electronics
V
DD
IRQ
SCL
SDA
X1
X2
VBAT
1
2
3
4
14
13
12
11
GND
5
6
7
10
9
8
AC
ACRDY
LV
F
OUT
EVIN
EVDET
Data Sheet May 5, 2011
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