參數(shù)資料
型號: X1227V8-2.7
元件分類: CPU監(jiān)測
英文描述: RTC Module With CPU Supervisor
中文描述: 時鐘模塊CPU監(jiān)控
文件頁數(shù): 1/28頁
文件大小: 442K
代理商: X1227V8-2.7
REV 1.1.20 1/13/03
Characteristics subject to change without notice.
1 of 28
www.xicor.com
4K (512 x 8)
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
4K 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
Low Power CMOS
—1.25μA Operating Current (Typical)
Small Package Options
—8-Lead SOIC and 8-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
DESCRIPTION
The X1227 device is a Real Time Clock with clock/
calendar, two polled alarms with integrated 512x8
EEPROM, oscillator compensation, CPU Supervisor
(POR/LVS and WDT) and battery backup switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. All compensation and trim components are
integrated on the chip. This eliminates several external
discrete components and a trim capacitor, saving
board area and component cost.
X1227
BLOCK DIAGRAM
X1
X2
Oscillator
Frequency
Divider
Timer
Calendar
Logic
8
Control/
Registers
(EEPROM)
1Hz
Time
Keeping
Registers
(SRAM)
Alarm Regs
(EEPROM)
Compare
M
RESET
Control
Decode
Logic
Alarm
SCL
SDA
Serial
Interface
Decoder
4K
EEPROM
ARRAY
Watchdog
Timer
Low Voltage
Reset
Registers
Status
(SRAM)
V
CC
V
BACK
32.768kHz
Battery
Switch
Circuitry
OSC
Compensation
*I2C is a Trademark of Philips.
New Features
Repetitive Alarms &
Temperature Compensation
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