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X1226 数据表(PDF) 2 Page - Xicor Inc. |
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X1226 数据表(HTML) 2 Page - Xicor Inc. |
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2 / 24 page  X1226 REV 1.1.24 1/13/03 Characteristics subject to change without notice. 2 of 24 www.xicor.com DESCRIPTION (continued) The Real-Time Clock keeps track of time with separate registers for Hours, Minutes, Seconds. The Calendar has separate registers for Date, Month, Year and Day- of-week. The calendar is correct through 2099, with automatic leap year correction. The powerful Dual Alarms can be set to any Clock/ Calendar value for a match. For instance, every minute, every Tuesday, or 5:23 AM on March 21. The alarms can be polled in the Status Register or provide a hardware interrupt (IRQ Pin). There is a repeat mode for the alarms allowing a periodic interrupt. The PHZ/IRQ pin may be software selected to provide a frequency output of 1 Hz, 4096 Hz, or 32,768 Hz. The device offers a backup power input pin. This VBACK pin allows the device to be backed up by battery or SuperCap. The entire X1226 device is fully operational from 2.7 to 5.5 volts and the clock/calendar portion of the X1226 device remains fully operational down to 1.8 volts (Standby Mode). The X1226 device provides 4K 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 outputs. The input buffer is always active (not gated). An open drain output requires the use of a pull-up resistor. 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 inter- face 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 battery, a Supercap or tied to ground if not used. Programmable Frequency/Interrupt Output – PHZ/IRQ This is either an output from the internal oscillator or an interrupt signal output. It is an open drain output. When used as frequency output, this signal has a frequency of 32.768kHz, 4096Hz, 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 Mem- ory map. Refer to “Programmable Frequency Output Bits” on page 6. 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 X1226 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 recommendations. Figure 1. Recommended Crystal connection 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. NC = No internal connection X1 X2 VBACK VCC PHZ/IRQ SCL SDA VSS 1 2 3 4 7 8 6 5 8-Pin TSSOP X1226 X1 X2 VBACK VCC PHZ/IRQ SCL SDA VSS 1 2 3 4 7 8 6 5 8-Pin SOIC X1 X2 |
类似零件编号 - X1226 |
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类似说明 - X1226 |
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