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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CS212EDW16 데이터시트(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS212EDW16 데이터시트(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 7 page  4 Serial-Addressable Receiver Transmitter S-ART ADDRESS CODING The circuit is coded on address inputs A0-A4. In order to reduce the power consumption to the circuits they are in power down mode for most of the time. Only when a circuit is addressed is the amount to that particular circuit increased. READ When a S-ART has recognized an address with the correct parity and then received a READ-order the controller becomes passive. The S-ART in question will then send data bits to the controller. These bits are the condition on the IN0 and IN1 or IN2-3 and a parity bit derived from them. The current in inputs IN0 and IN1 only flows when the S-ART is addressed. If the sabotage surveilled loop IN2-3 is used IN1 should be open. IN2-3 is then read instead of IN1. The loop IN2-3 is checked for both shorting and breaking. WRITE When a S-ART has recognized an address with correct par- ity and a write order, the S-ART in question transmits data to the outputs OUT0 and OUT1. This data transmission takes place after a check of the parity bit. If the parity bit is wrong, data transmission to OUT0 and OUT1 is blocked and new data transmission can only take place after a read order which resets the parity fault. The DSR signal can be used to strobe OUT0 and OUT1 fur- ther on in the following logic. DATA FORMAT The signals are sent out on the line in words organized as shown in the figure. The S-ART information consists of two parity bits: an address parity bit and a data parity bit. Both the address and data are checked for even parity. The address parity bit must always be generated by the controller. The data parity bit during the READ-mode is generated by the S-ART. During the WRITE-mode the data parity bit is gen- erated by the controller. Typical S-ART Applications S-ART S-ART 1) Alarm Detector Line from Controller Address Coding 3) Alarm Indicator/Data Transmission Line from Controller Address Coding IN0 IN1 Tamper Contact Alarm Contact Detector Bells Lamps etc. Logic Circuit S-ART 2) Window Foil Line from Controller Address Coding IN2 IN3 Foil Terminal Lead The foil is checked both for shorts and breakage. Short Cables End of Loop Circuit Address Code Transmission Line Line Data Out V DD Gnd IN0 +IN1 +IN2 +IN3 C R1 A0 A4 OUT0 OUT1 DSR Gnd Gnd R2 Addresses ADD. Parity Command Data Data Parity + Indicates IN1 and Loop IN2, IN3 cannot be used at the same time. Functional Description GENERAL The CS212 is a peripheral addressable circuit which is used as a communication link between Detectors/Sensors and a Central Control Unit. The communication between the CS212 and a control unit takes place via a simple 2-wire cable which also provides power to the IC. On each 2-wire cable, a maximum of 30 CS212's can be con- trolled or interrogated with the address binary 0-29. This permits surveillance of up to 30 window protections, door contacts, movement detectors, etc. within the same 2-wire group. Each CS212 can monitor the status of two external surveillance devices and communicate the status back to the control unit. Two outputs are also available for control- ling bells, lights, LED's, door locks, etc. These outputs are controlled from the control unit via the 2-wire cable. WIRE TRANSMISSION CABLE (The Line) The 2-wire bidirectional transmission cable called "The Line" provides power and data to the CS212 and also pro- vides data back to the control circuit. The line signal is rectified and filtered at each CS212 and is used for the power supply to the chip. The CS212 also decodes the line signal into clock and data signals used inside the IC. |
유사한 부품 번호 - CS212EDW16 |
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유사한 설명 - CS212EDW16 |
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