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ISL1219 bảng dữ liệu(PDF) 8 Page - Intersil Corporation |
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ISL1219 bảng dữ liệu(HTML) 8 Page - Intersil Corporation |
8 / 24 page 8 FN6314.1 August 14, 2006 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 Super Cap or tied to ground if not used. EVIN (Event Input) The EVIN pin is an input that is used to detect an externally monitored event. When a high signal is present at the EVIN pin, an “event” is detected. This input may be used for various monitoring functions, such as the opening of a detection switch on a chassis or door. The event detection circuit can be user enabled or disabled (see EVEN bit) and provides the option to be operational in battery backup modes (see EVBATB bit). When the event detection is disabled the EVIN pin is gated OFF. See functional Description for more details. EVDET (Event Detect Output) The EVDET is an open drain output which will go low when an event is detected at the EVIN pin. If the event detection function is enabled, the EVDET output will go low and stay low until the EVT bit is cleared (see EVIN pin description). IRQ/FOUT (Interrupt Output/Frequency Output) This dual function pin can be used as an interrupt or frequency output pin. The IRQ/FOUT mode is selected via the frequency out control bits of the control/status register. • Interrupt Mode. The pin provides an interrupt signal output. This signal notifies a host processor that an alarm has occurred and requests action. It is an open drain active low output. • 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. It is an open drain active low output. 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 bidirectional 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 VDD = 2.7V to 5.5VDC. A 0.1µF capacitor is recommended on the VDD pin to ground. Functional Description Power Control Operation The power control circuit accepts a VDD and a VBAT input. Many types of batteries can be used with Intersil RTC products. For example, 3.0V or 3.6V Lithium batteries are appropriate, and battery sizes are available that can power the ISL1219 for up to 10 years. Another option is to use a Super Cap for applications where VDD is interrupted for up to a month. See the Applications Section for more information. Normal Mode (VDD) to Battery Backup Mode (VBAT) To transition from the VDD to VBAT mode, both of the following conditions must be met: Condition 1: VDD < VBAT - VBATHYS where VBATHYS ≈ 50mV Condition 2: VDD < VTRIP where VTRIP ≈ 2.2V Battery Backup Mode (VBAT) to Normal Mode (VDD) The ISL1219 device will switch from the VBAT to VDD mode when one of the following conditions occurs: Condition 1: VDD > VBAT + VBATHYS where VBATHYS ≈ 50mV Condition 2: VDD > VTRIP + VTRIPHYS where VTRIPHYS ≈ 30mV FIGURE 10. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL1219 |
Số phần tương tự - ISL1219 |
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Mô tả tương tự - ISL1219 |
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