LS6525

  FEATURES: LS6525 LS6526 Mar 2013 BATTERY POWERED LOW-POWER PIR SENSOR INTERFACE Power derived from 3.0V Lithium battery VDD operating range 2.3V to 3.6V 25μA maximum quiescent current (LS6525) 30μA 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) PIN ASSIGNMENT APPLICATIONS: The low operating voltage and low current drain make the LS65 25 / LS6526 ideal for microcontroller based portable applications such as battery operate d motion detectors and photographic equipment, automatic doors, intrusion detecti on, and anywhere electric outlets are not available. DESCRIPTION: The LS6525 / LS6526 is a CMOS integrated circuit designe d fo r detecting motion from a PIR sen sor and is micro controller interface ready. It uses a 3.0V Li battery as a source of energy fo r its operation. The detailed de scription of the functional b locks is as follows (refer to Figure 2). Figure 1 AMPLIFIERS The input PIR p reamplifier, AMP1, has a nominal gain set at 29V/V using internal resistors. An int ernal bias is u sed so that AMP1O output has a q uiescent 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 secon d stage is internally biased and applied to a...