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X1288V14Z Folha de dados(PDF) 3 Page - Intersil Corporation |
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X1288V14Z Folha de dados(HTML) 3 Page - Intersil Corporation |
3 / 27 page 3 FN8102.3 April 14, 2006 PIN ASSIGNMENTS Pin Number Symbol Brief Description SOIC TSSOP 11 X1 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. 22 X2 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 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 information. 76 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. 87 VSS VSS. 98 SDA 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 speed. 10 9 SCL 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). 14 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, 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. 15 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. 16 14 VCC VCC. X1288 |
Nº de peça semelhante - X1288V14Z |
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Descrição semelhante - X1288V14Z |
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