Real Time Clock/Calendar/CPU Supervisor with EEPROM
Description
New Features Repetitive Alarms & Temperature Compensation
4K (512 x 8)
X1228
2-Wire™ RTC
Real Time Clock/Calendar/CPU Supervisor with EEPROM
FEATURES
• Real Time Clock/Calendar — Tracks time in Hours, Minutes, and Seconds — Day of the Week, Day, Month, and Year • 2 Polled Alarms (Non-volatile) — Settable on the Second, Minute, Hour, Day of the Week, Day, or Month — Repeat Mode (periodic interrupts) • Oscillator Compensation on chip — Internal feedback resistor and compensation capacitors — 64 position Digitally Controlled Trim Capacitor — 6 digital frequency adjustment settings to ±30ppm • CPU Supervisor Functions — Power On Reset, Low Voltage Sense — Watchdog Timer (SW Selectable: 0.
25s, 0.
75s, 1.
75s, off) • Battery Switch or Super Cap Input • 512 x 8 Bits of EEPROM — 64-Byte Page Write Mode — 8 modes of Block Lock™ Protection — Single Byte Write Capability • High Reliability — Data Retention: 100 years — Endurance: 100,000 cycles per byte • 2-Wire™ Interface interoperable with I2C* — 400kHz data transfer rate • Frequency Output (SW Selectable: Off, 1Hz, 4096Hz, or 32.
768kHz) • Low Power CMOS — 1.
25µA Operating Current (Typical) • Small Package Options — 14-Lead SOIC and 14-Lead TSSOP
APPLICATIONS • • • • • • • • • • • • • • • Utility Meters HVAC Equipment Audio / Video Components Set Top Box / Television 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 / Automotive
BLOCK DIAGRAM
OSC Compensation
X1
32.
768kHz
X2
Oscillator
Frequency Divider
1Hz
Timer Calendar Logic
Time Keeping Registers (SRAM)
Battery Switch Circuitry
VCC VBACK
PHZ/IRQ
Select Status Registers (SRAM) Mask
SCL SDA
Serial Interface Decoder
Control Decode Logic
Control/ Registers (EEPROM)
Alarm
Compare Alarm Regs (EEPROM) 4K EEPROM ARRAY
8
RESET
Watchdog Timer Low Voltag...
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