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LS7223 датащи(PDF) 1 Page - LSI Computer Systems |
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LS7223 датащи(HTML) 1 Page - LSI Computer Systems |
1 / 4 page KEYPAD PROGRAMMABLE DIGITAL LOCK FEATURES : • Stand alone lock logic • 38416, 4-digit combinations • 3 different user programmable codes • Momentary and static lock control outputs • Internal key debounce circuit • Tamper detection output • Status outputs • Low current consumption • +4V to +15V operation (VDD -VSS) • LS7223 (DIP), LS7223-S (SOIC) - See Figure 1 GENERAL DESCRIPTION: The LS7223 is a programmable electronic lock implemented in a monolithic CMOS integrated circuit. The circuit contains all the necessary memory, decoder and control logic to make a programmable "keyless" lock system to control electro- mechanical locks. Input is provided by a matrix keypad whose maximum allowable size is 4 x 4. The LS7223 can be programmed to recognize 3 different codes: one to toggle an output and generate a pulse (Primary), one to toggle an output (Secondary), and one to toggle an output and trigger an alarm (Duress). Programming is done via the keypad inputs. Any entry from the keypad (when not in the program mode) which does not match one of the 3 programmed codes causes the Tamper output to become active. The monolithic, low power CMOS design of the LS7223 enables it to be designed into typical battery backed-up and automotive type security systems. DETAILED DESCRIPTION: CODES - There are 3 different function codes which the LS7223 can store in memory. Each code consists of a 4 digit number which must be entered in exact sequence and before the keypad entry enable time expires. The 3 codes and their functions are explained below. 1. The Primary code, when entered from the keypad, causes the Lock 1 output to toggle and the Momentary output to momentarily go high. Whenever power is first applied to the LS7223, the circuit defaults to the Primary code corresponding to the keys X1 Y1, X1 Y2, X2 Y2, X2 Y1. The code can then be altered to any other 4 digit code by entering the Program mode and keying in the new code. 2. The Secondary code, when entered from the key- pad, causes the Lock 2 output to toggle. The first 3 digits of the Secondary code must be identical to the first 3 digits of the Primary code; the 4th digit may or may not be identical for the two codes. When the two codes are the same in all 4 digits, the entry of the code will cause both the Lock 1 and the Lock 2 outputs to toggle. Whenever power is first applied to the LS7223, the circuit defaults to the Secondary code corresponding to the keys X1 Y1, X1 Y2, X2 Y2, X1 Y1. The code can then be altered by entering the Program mode. 3. The Duress code, when entered from the keypad, causes the Lock 1 output to toggle; at the same time the Alarm output will latch high to enable an external alarm. The first 3 digits of the Duress code must be identical to the first 3 digits of the Primary and Secondary codes; the 4th digit must be different to activate the Alarm output. Whenever power is first applied to the LS7223, the circuit defaults to the Duress code corresponding to the keys X1 Y1, X1 Y2, X2 Y2, X1 Y2. The code can then be altered the same way as the other two codes. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 CONNECTION DIAGRAM - TOP VIEW VDD (+V) CAP-K LOCK DISPLAY LOCK 1 LOCK 2 ALARM TAMPER CAP-M PROGRAM MOM V SS (-V) RC-OSC X1 X2 X3 X4 Y1 Y2 Y3 Y4 FIGURE 1 December 2002 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS7223 7223-121102-1 UL ® A3800 |
Аналогичный номер детали - LS7223 |
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Аналогичное описание - LS7223 |
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