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X1228S14IZ-4.5A датащи(PDF) 9 Page - Intersil Corporation |
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X1228S14IZ-4.5A датащи(HTML) 9 Page - Intersil Corporation |
9 / 29 page 9 FN8100.4 May 18, 2006 DESCRIPTION The X1228 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. 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 X1228 device integrates CPU Supervisor func- tions and a Battery Switch. There is a Power-On Reset (RESET output) with typically 250 ms delay from power-on. It will also assert RESET when Vcc goes below the specified threshold. The Vtrip threshold is user repro-grammable. There is a WatchDog Timer (WDT) with 3 selectable time-out periods (0.25s, 0.75s, 1.75s) and a disabled setting. The watchdog activates the RESET pin when it expires. The device offers a backup power input pin. This VBACK pin allows the device to be backed up by battery or SuperCap. The entire X1228 device is fully operational from 2.7 to 5.5 volts and the clock/calendar portion of the X1228 device remains fully operational down to 1.8 volts (Standby Mode). The X1228 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 col- lector 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 interface speeds. 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. 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, 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. See “Programmable Frequency Output Bits—FO1, FO0” on page 14. NC = No internal connection X1228 NC NC X1 X2 1 2 3 4 13 14 12 11 14 LD TSSOP/SOIC 5 6 7 10 9 8 RESET VSS VCC VBACK PHZ/IRQ NC SCL NC SDA NC X1228 |
Аналогичный номер детали - X1228S14IZ-4.5A |
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Аналогичное описание - X1228S14IZ-4.5A |
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