Datenblatt-Suchmaschine für elektronische Bauteile |
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ISL12059IBZ-T Datenblatt(PDF) 6 Page - Intersil Corporation |
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ISL12059IBZ-T Datenblatt(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 FN6757.0 June 15, 2009 General Description The ISL12059 device is a low power real time clock with clock/calendar, and 512Hz/Digital Output function. The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction. Pin Description 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 ISL12059 to supply a timebase for the real time clock. Refer to Figure 4. The device can also be driven directly from a 32.768kHz square wave source with peak-to-peak voltage from 0V to VDD at X1 pin with X2 pin floating. FT/OUT(512Hz Frequency Output/Logic Output) This dual function pin can be used as a 512Hz frequency output or a simple digital output control via I2C. The FT/OUT mode is selected via the OUT and FT control bits of the control/status register (address 07h). The FT/OUT pin is an open drain output that requires the use of a pull-up resistor, and it can accept a pull-up voltage up to 5.5V. This pin is at high impedance at power-up. Serial Clock (SCL) The SCL input is used to clock all serial data into and out of the device. The input buffer on this pin is always active (not gated). The SCL pin can accept a logic high voltage up to 5.5V. Serial Data (SDA) SDA is a bi-directional pin used to transfer data into and out of the device. It has an open drain output and may be ORed with other open drain or open collector outputs. The input buffer is always active (not gated) in normal mode. An open drain output requires the use of a pull-up resistor, and it can accept a pull-up voltage up to 5.5V. 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 I2C interface speeds. NOTE: Parts will work with SDA pull-up voltage above the VPULLUP limit but the tAA and tFin the I 2C parameters are not guaranteed. VDD, GND Chip power supply and ground pins. The device will have full operation with a power supply from 1.8V to 3.6V, and timekeeping function with a power supply from 1.4V to 3.6V. A 0.1µF decoupling capacitor is recommended on the VDD pin to ground. NC (No Connection) The NC pin is not connected to the die. The pin can be connected to GND or left floating. Functional Description Real Time Clock Operation The Real Time Clock (RTC) uses an external 32.768kHz quartz crystal to maintain an accurate internal representation of second, minute, hour, day of week, date, month, and year. The RTC also has leap-year correction. The RTC also corrects for months having fewer than 31 days. The clock will begin incrementing after power-up with valid oscillator condition. Typical Performance Curves Temperature is +25°C unless otherwise specified. FIGURE 2. IDD1 vs VDD FIGURE 3. IDD1 vs TEMPERATURE 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 1.41.9 2.42.9 3.4 VDD (V) 0.2 0.4 0.6 0.8 1.0 -40 -20 0 204060 80 TEMPERATURE (°C) 3.0 1.8 1.4 3.6 FIGURE 4. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL12059 |
Ähnliche Teilenummer - ISL12059IBZ-T |
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Ähnliche Beschreibung - ISL12059IBZ-T |
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