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X1288V14I-2.7A Folha de dados(PDF) 9 Page - Intersil Corporation |
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X1288V14I-2.7A Folha de dados(HTML) 9 Page - Intersil Corporation |
9 / 27 page 9 FN8102.3 April 14, 2006 The device offers a backup power input pin. This VBACK pin allows the device to be backed up by battery or SuperCap. The entire X1288 device is fully operational from 2.7 to 5.5 volts and the clock/calendar portion of the X1288 device remains fully operational down to 1.8 volts (Standby Mode). The X1288 device provides 256K bits of EEPROM with 8 modes of BlockLock™ control. The BlockLock allows a safe, secure memory for critical user and configuration data, while allowing a large user storage area. PIN DESCRIPTIONS Serial Clock (SCL) The SCL input is used to clock all data into and out of the device. The input buffer on this pin is always active (not gated). Serial Data (SDA) SDA is a bidirectional pin used to transfer data into and out of the device. It has an open drain output and may be wire ORed with other open drain or open collector out- puts. The input buffer is always active (not gated). An open drain output requires the use of a pull-up resis- tor. The output circuitry controls the fall time of the output signal with the use of a slope controlled pull-down. The circuit is designed for 400kHz 2-wire interface speed. VBACK This input provides a backup supply voltage to the device. VBACK supplies power to the device in the event the VCC supply fails. This pin can be connected to a bat- tery, a Supercap or tied to ground if not used. RESET Output – 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 thresh- old. It is an open drain active LOW output. Recom- mended value for the pullup resistor is 5k Ω. If unused, tie to ground. Programmable Frequency/Interrupt Output – PHZ/IRQ This is either an output from the internal oscillator or an interrupt signal output. It is a CMOS output. When used as frequency output, this signal has a fre- quency of 32.768kHz, 100Hz, 1Hz or inactive. When used as interrupt output, this signal notifies a host processor that an alarm has occurred and an action is required. It is an active LOW output. The control bits for this function are FO1 and FO0 and are found in address 0011h of the Clock Control Memory map. See “Programmable Frequency Output Bits - FO1, FO0” on page 13. X1, X2 The X1 and X2 pins are the input and output, respectively, 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 and X2 are highly recommended. See Application section for more information. POWER CONTROL OPERATION The power control circuit accepts a VCC and a VBACK input. The power control circuit powers the clock from VBACK when VCC < VBACK - 0.2V. It will switch back to power the device from VCC when VCC exceeds VBACK. REAL TIME CLOCK OPERATION The Real Time Clock (RTC) uses an external 32.768kHz quartz crystal to maintain an accurate internal represen- tation of the 1/100 of a second, second, minute, hour, day, date, month, and year. The RTC has leap-year cor- rection. The clock also corrects for months having fewer than 31 days and has a bit that controls 24 hour or AM/PM format. When the X1288 powers up after the loss of both VCC and VBACK, the clock will not operate until at least one byte is written to the clock register. X1288 X1 X2 VBACK VCC NC PHZ/IRQ NC VSS 1 2 3 4 13 14 12 11 14 Ld TSSOP NC NC SCL NC RESET SDA 5 6 7 9 10 8 16 Ld SOIC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 X1 X2 NC VSS NC NC RESET NC VBACK VCC PHZ/IRQ NC SCL NC SDA NC NC = No internal connection X1 X2 FIGURE 2. RECOMMENDED CRYSTAL CONNECTION VBACK In Voltage VCC On Off FIGURE 3. POWER CONTROL X1288 |
Nº de peça semelhante - X1288V14I-2.7A |
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Descrição semelhante - X1288V14I-2.7A |
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