Datenblatt-Suchmaschine für elektronische Bauteile |
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ISL1209IU10 Datenblatt(PDF) 9 Page - Intersil Corporation |
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ISL1209IU10 Datenblatt(HTML) 9 Page - Intersil Corporation |
9 / 24 page 9 FN6109.4 October 17, 2006 Power Mode, is available to allow direct switching from VDD to VBAT without requiring VDD to drop below VTRIP. Since the additional monitoring of VDD vs. VTRIP is no longer needed, that circuitry is shut down and less power is used while operating from VDD. Power savings are typically 600nA at VDD = 5V. Low Power Mode is activated via the LPMODE bit in the control and status registers. Low Power Mode is useful in systems where VDD is normally higher than VBAT at all times. The device will switch from VDD to VBAT when VDD drops below VBAT, with about 50mV of hysteresis to prevent any switchback of VDD after switchover. In a system with a VDD = 5V and backup lithium battery of VBAT = 3V, Low Power Mode can be used. However, it is not recommended to use Low Power Mode in a system with VDD = 3.3V ±10%, VBAT ≥ 3.0V, and when there is a finite I-R voltage drop in the VDD line. InterSeal™ Battery Saver The ISL1209 has the InterSeal™ Battery Saver which prevents initial battery current drain before it is first used. For example, battery-backed RTCs are commonly packaged on a board with a battery connected. In order to preserve battery life, the ISL1209 will not draw any power from the battery source until after the device is first powered up from the VDD source. Thereafter, the device will switchover to battery backup mode whenever VDD power is lost. Event/Tamper Monitor and Detection The ISL1209 provides an event detection and alarm function to be used in a wide variety of applications ranging from security, warranty monitoring, data collection and recording. The tamper detect input pin, EVIN, can be used as a event or tamper detection input of an external switch (mechanical or electronic). When the EVIN pin is a valid HIGH, the ISL1209 sets the EVT bit in the status register and, can optionally: 1) Issue an Event output signal (EVDET pin), 2) At the time event occurred, stop the RTC registers from advancing. To allow for flexibility of external switches used at the EVIN pin, the internal pull-up (~1µA in full on mode) can be disabled/enabled. This will allow more flexibility depending on the capacitive and resistive loading at the EVIN pin. A noise filter option is also provided for the event monitor circuit. The EVIN pin has a time based filter where the EVIN signal must be stable for a period of time to trigger a valid detection. The time hysteresis filter can vary from 0, 3.9ms, 15.2ms or 31.25ms. For low power applications the event monitor can be sampled at a user selectable rate. The EVIN pin can be always ON or periodically sampled with a frequency of 1/4, 1or 2Hz. Event Detect Timing Diagram With Sampling Mode Enabled Case 1, Switched Opened Before Ipu Case 2, Switched Opened After Ipu Case 3, Switched Bounced The ISL1209 can operate independently or in conjunction with a microcontroller for low power operation modes or in battery backup modes. The event detection circuits operate in either main VDD power or battery backup mode. 8 clks (8x) 15 clks (8x) OFF ON OPEN CLOSED LOW HIGH HIGH LOW EVDET EVIN EXT. SWITCH Ipu 8 clks (8x) 15 clks (8x) OFF ON OPEN CLOSED LOW HIGH HIGH LOW EVDET EVIN EXT. SWITCH Ipu 15 clks (8x) OFF ON OPEN CLOSED LOW HIGH HIGH LOW EVDET EVIN EXT. SWITCH Ipu 8 clks (8x) ISL1209 |
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