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LS6525 Datasheet(PDF) 1 Page - LSI Computer Systems |
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LS6525 Datasheet(HTML) 1 Page - LSI Computer Systems |
1 / 5 page 6525-030713-1 FEATURES: • Power derived from 3.0V Lithium battery • VDD operating range 2.3V to 3.6V • 25 μA maximum quiescent current (LS6525) • 30 μA maximum quiescent current (LS6526) • Direct interface with PIR sensor • Analog signal and digital interrupt signal outputs for interfacing with a MCU • 2.175V regulated output • Low battery indicator output (LS6526) • LS6525 (DIP), LS6525-S (SOIC) LS6526 (DIP), LS6526-S (SOIC) APPLICATIONS: The low operating voltage and low current drain make the LS6525 / LS6526 ideal for microcontroller based portable applications such as battery operated motion detectors and photographic equipment, automatic doors, intrusion detection, and anywhere electric outlets are not available. DESCRIPTION: The LS6525 / LS6526 is a CMOS integrated circuit designed for detecting motion from a PIR sensor and is microcontroller interface ready. It uses a 3.0V Li battery as a source of energy for its operation. The detailed description of the functional blocks is as follows (refer to Figure 2). AMPLIFIERS The input PIR preamplifier, AMP1, has a nominal gain set at 29V/V using internal resistors. An internal bias is used so that AMP1O output has a quiescent voltage of 1.1V. The output of the PIR amplifier is AC coupled to a second amplifier (AMP2) which uses external components to set the gain. This second stage is internally biased and applied to a window comparator which has lower and higher trip levels set with respect to that bias. External components are used to set a typical gain of 22V/V. Amplified signals greater in magnitude than the trip levels will cause an interrupt signal to be generated at the INT open drain output, pin 12. The INT output can be pulled to a voltage higher than VDD (pin 13). The output of the PIR amplifier is also AC coupled to an additional amplifier (MCU amplifier) which uses external components to set the gain. An internal bias set the MCO output at 0.5V and external resistors set a typical gain = 10V/V, the MCO output signal can be applied to a microcontroller input for processing. Figure 1 INPUT / OUTPUT DESCRIPTION PIN1 – PYRO Input – Non-inverting input of PIR amplifier AC coupled to source of PIR signal. PIN2 – VREG Output – This output provides power to the PIR Sensor circuit and for all the internal amplifier circuitry. PIN3 – AMP1O Output – Output terminal of the PIR amplifier PIN4 – MCP – 0.5V internal bias. (Internal use only. No external components.) PIN5 – MCN Input – Inverting input to the MCU amplifier. PIN6 – MCO Output – Output of the MCU amplifier. BATTERY POWERED LOW-POWER PIR SENSOR INTERFACE Mar 2013 LS6525 LS6526 PIN ASSIGNMENT |
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