Document
Preliminary Information
New Features Repetitive Alarms & Temperature Compensation
2-Wire™ RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
FEATURES
• Real Time Clock/Calendar — Tracks time in Hours, Minutes, Seconds and Hundredths of a Second — 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 setting 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 • 32K x 8 Bits of EEPROM — 128-Byte Page Write Mode — 8 modes of Block Lock™ Protection — Single Byte Write Capability
X1288
• 2-Wire™ Interface interoperable with I2C* — 400kHz data transfer rate • Frequency Output (SW Selectable: Off, 1Hz, 100Hz, or 32.768kHz) • Low Power CMOS — 1.25µA Operating Current (Typical) • Small Package Options — 16-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
• High Reliability —Data Retention: 100 years —Endurance: 100,000 cycles per byte
BLOCK DIAGRAM
OSC Compensation X1 Timer Calendar Logic Battery Switch Circuitry
32.768kHz
X2
Oscillator
Frequency Divider
1Hz
Time Keeping Registers (SRAM)
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) 256K EEPROM ARRAY
8
RESET
Watchdog Timer Low Voltage Reset
*I2C is a Trademark of Philips. REV 1.1.30 3/24/04
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Preliminary Information
PIN DESCRIPTIONS
X1288
16-pin SOIC X1 X2 NC NC NC NC RESET VSS
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
14-pin TSSOP VCC VBACK PHZ/IRQ NC NC NC SCL SDA NC = No internal connection X1 X2 NC NC NC RESET VSS 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC VBACK PHZ/IRQ NC NC SCL SDA
ORDERING INFORMATION VCC Range
4.5–5.5V
VTRIP Range
4.63V±112mV
Package
16L SOIC 14L TSSOP
Operating Temperature Range
0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C 0–70°C -40–85°C
Part Number
X1288S16-4.5A X1288S16I-4.5A X1288V14-4.5A X1288V14I-4.5A X1288S16 X1288S16I X1288V14 X1288V14I X1288S16-2.7A X1288S16I-2.7A X1288V14-2.7A X1288V14I-2.7A X1288S16-2.7 X1288S16I-2.7 X1288V14-2.7 X1288V14I-2.7
4.5–5.5V
4.38V±112mV
16L SOIC 14L TSSOP
2.7–5.5V
2.85V±100mV
16L SOIC 14L TSSOP
2.7–5.5V
2.65V±100mV
16L SOIC 14L TSSOP
REV 1.1.30 3/24/04
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Preliminary Information
PART MARK INFORMATION 14-Lead TSSOP YWW XXXXX 1288F = 2.7 to 5.5V, 0 to +70°C, VTRIP=2.65V±100mV 1288G = 2.7 to 5.5V, -40 to +85°C, VTRIP=2.65V±100mV 1288AN = 2.7 to 5.5V, 0 to +70°C, VTRIP=2.85V±100mV 1288AP = 2.7 to 5.5V, -40 to +85°C, VTRIP=2.85V±100mV 1288 = 2.7 to 5.5V, 0 to +70°C, VTRIP=4.38V±112mV 1288I = 2.7 to 5.5V, -40 to +85°C, VTRIP=4.38V±112mV 1288AL = 2.7 to 5.5V, 0 to +70°C, VTRIP=4.63V±112mV 1288AM = 2.7 to 5.5V, -40 to +85°C, VTRIP=4.63V±112mV 16-Lead SOIC YWW XXXXX 1288F = 2.7 to 5.5V, 0 to +70°C, VTRIP=2.65V±100mV 1288G = 2.7 to 5.5V, -40 to +85°C, VTRIP=2.65V±100mV 1288AN = 2.7 to 5.5V, 0 to +70°C, VTRIP=2.85V±100mV 1288AP = 2.7 to 5.5V, -40 to +85°C, VTRIP=2.85V±100mV 1288 = 2.7 to 5.5V, 0 to +70°C, VTRIP=4.38V±112mV 1288I = 2.7 to 5.5V, -40 to +85°C, VTRIP=4.38V±112mV 1288AL = 2.7 to 5.5V, 0 to +70°C, VTRIP=4.63V±112mV 1288AM = 2.7 to 5.5V, -40 to +85°C, VTRIP=4.63V±112mV
X1288
REV 1.1.30 3/24/04
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Preliminary Information
PIN ASSIGNMENTS Pin Number SOIC
1
X1288
TSSOP Symbol
1 X1
Brief Description
X1. The X1 pin is the input of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1288 to supply a timebase for the real time clock. The recommended crystal is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a complete oscillator circuit. Care should be taken in the placement of the crystal and the layout of the circuit. Plenty of ground plane around the device and short traces to X1 are highly recommended. See Application section for more information. X2. The X2 pin is the output of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1288 to supply a timebase for the real time clock. The recommended crystal is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a complete oscillator circuit. Care should be taken in the placement .