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CS1124YD8 bảng dữ liệu(PDF) 3 Page - ON Semiconductor |
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CS1124YD8 bảng dữ liệu(HTML) 3 Page - ON Semiconductor |
3 / 8 page CS1124 http://onsemi.com 3 PACKAGE PIN DESCRIPTION* PACKAGE PIN # SO–8 PIN SYMBOL FUNCTION 1 INAdj External resistor to ground that sets the trip levels of both channels. Functions for both diagnostic and normal mode. 2 IN1 Input to channel 1. 3 IN2 Input to channel 2. 4 GND Ground. 5 DIAG Diagnostic mode switch. Normal mode is low. 6 OUT2 Output of channel 2. 7 OUT1 Output of channel 1. 8 VCC Positive 5.0 volt supply input. OUT1 To µP VCC VCC VCC VCC VCC INP1 INAdj DIAG IN1 C1 R1 RRS VRS Variable Reluctance Sensor + – COMP1 Active Clamp RAdj GND Figure 2. Application Diagram THEORY OF OPERATION NORMAL OPERATION Figure 2 shows one channel of the CS1124 along with the necessary external components. Both channels share the INAdj pin as the negative input to a comparator. A brief description of the components is as follows: VRS – Ideal sinusoidal, ground referenced, sensor output – amplitude usually increases with frequency, depending on loading. RRS – Source impedance of sensor. R1/RAdj – External resistors for current limiting and biasing. INP1/INAdj – Internal current sources that determine trip points via R1/RAdj. COMP1 – Internal comparator with built–in hysteresis set at 160 mV. OUT1 – Output 0 V – 5.0 V square wave with the same frequency as VRS. By inspection, the voltage at the (+) and (–) terminals of COMP1 with VRS = 0V are: V+ + INP1(R1 ) RRS) (1) |
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