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LS6525 PDF预览

LS6525

更新时间: 2024-02-22 13:30:33
品牌 Logo 应用领域
LSI 电池传感器红外传感器
页数 文件大小 规格书
5页 191K
描述
BATTERY POWERED LOW-POWER PIR SENSOR INTERFACE

LS6525 数据手册

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LS6525  
LS6526  
Mar 2013  
BATTERY POWERED LOW-POWER PIR SENSOR INTERFACE  
FEATURES:  
PIN ASSIGNMENT  
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)  
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).  
Figure 1  
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).  
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.)  
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.  
PIN5 – MCN Input – Inverting input to the MCU amplifier.  
PIN6 – MCO Output – Output of the MCU amplifier.  
6525-030713-1  

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