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ISL12082IB8Z-T bảng dữ liệu(PDF) 8 Page - Intersil Corporation |
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ISL12082IB8Z-T bảng dữ liệu(HTML) 8 Page - Intersil Corporation |
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8 / 26 page  8 FN6731.3 November 24, 2008 General Description The ISL12082 device is a low power real time clock with timing and crystal compensation, clock/calendar, power fail indicator, periodic or polled alarm, timer/watchdog, and intelligent battery backup switching. The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, seconds, and sub-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. The ISL12082's powerful alarm can be set to any clock/calendar value for a match. For example, every minute, every Tuesday or at 5:23 AM on March 21. The alarm status is available by checking the Status Register, or the device can be configured to provide a hardware interrupt via the IRQ1/fOUT or IRQ2 pin. There is a repeat mode for the alarm allowing a periodic interrupt every minute, every hour, every day, etc. The ISL12082 has a powerful timer function. The timer status is available by checking the Status Register, or the device can be configured to provide a hardware interrupt via the IRQ2 pin. The device also offers a backup power input pin. This VBAT pin allows the device to be backed up by battery or Supercapacitor with automatic switchover from VDD to VBAT. The entire ISL12082 device is fully operational from 2.7V to 5.5V and the clock/calendar portion of the device remains fully operational down to 1.8V (Standby Mode). 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 ISL12082 to supply a timebase for the real time clock. Internal compensation circuitry provides high accuracy over the operating temperature range from -40°C to +85°C. This oscillator compensation network can be used to calibrate the crystal timing accuracy over-temperature either during manufacturing or with an external temperature sensor and microcontroller for active compensation. The device can also be driven directly from a 32.768kHz source at pin X1. VBAT This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that the VDD supply fails. This pin can be connected to a battery, a Supercapacitor or tied to ground if not used. IRQ1/fOUT (Interrupt Output 1/Frequency Output) The IRQ1/fOUT is an open drain output. This dual function pin can be used as an interrupt or frequency output pin. The IRQ1/fOUT mode is selected via the IRQ1E bit of the control register (address 08h). • Interrupt Mode. The pin provides an interrupt signal output. This signal notifies a host processor that an alarm has occurred and requests action. • Frequency Output Mode. The pin outputs a clock signal which is related to the crystal frequency. The frequency output is user selectable and enabled via the I2C bus. IRQ2 (Interrupt Output 2) The IRQ2 is an open drain output. The IRQ2 pin can be used as an alarm interrupt or timer interrupt output pin. The IRQ2 mode is selected via the IRQ2E control bits of the control register (address 08h). The pin provides an interrupt signal output. This signal notifies a host processor that an alarm or timer has occurred and requests action. 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). It is disabled when the backup power supply on the VBAT pin is activated to minimize power consumption. 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. 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. It is disabled when the backup power supply on the VBAT pin is activated. VDD, GND Chip power supply and ground pins. The device will operate with a power supply from 2.7V to 5.5VDC. A 0.1µF FIGURE 7. STANDARD OUTPUT LOAD FOR TESTING THE DEVICE WITH VDD = 5.0V 1533 Ω 100pF 5.0V FOR VOL= 0.4V AND IOL = 3mA EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V SDA IRQ1/fOUT AND IRQ2 FIGURE 8. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL12082 |
Số phần tương tự - ISL12082IB8Z-T |
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Mô tả tương tự - ISL12082IB8Z-T |
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