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X1228 датащи(PDF) 3 Page - Intersil Corporation |
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X1228 датащи(HTML) 3 Page - Intersil Corporation |
3 / 29 page 3 FN8100.4 May 18, 2006 PIN DESCRIPTIONS PIN ASSIGNMENTS Pin Number SOIC/TSSOP Symbol Brief Description 1X1 X1. The X1 pin is the input of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1228 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 recommendations. 2X2 X2. The X2 pin is the output of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1228 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 X2 are highly recommended. See Application section for more recommendations. 6 RESET 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 threshold. It is an open drain active LOW output. Recommended value for the pullup resistor is 5k Ω. If unused, tie to ground. 7VSS VSS. 8SDA 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 interface speeds. 9SCL 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). 12 PHZ/IRQ 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 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 Memory map. See “Programmable Frequency Output Bits—FO1, FO0” on page 14. 13 VBACK 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. 14 VCC VCC. NC = No internal connection 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 - X1228 |
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Аналогичное описание - X1228 |
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