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LS7222 Scheda tecnica(PDF) 1 Page - LSI Computer Systems |
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LS7222 Scheda tecnica(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 circuitry • Tamper detection output • Status outputs • Low current consumption • +4V to +15V operation (VDD - Vss) • LS7222 (DIP); LS7222-S (SOIC) - See Figure 1 GENERAL DESCRIPTION: The LS7222 is a programmable electronic lock imple- mented in a 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 key- pad whose maximum allowable size is 4 x 4. The LS7222 can be programmed to recognize 3 different codes: one to lock (Arm), one to unlock (Disarm), and one to unlock 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 low power CMOS design of the LS7222 enables it to be designed into battery backed-up and automotive type security systems. DETAILED DESCRIPTION: CODES - There are 3 different function codes which the LS7222 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 Arm code, when entered from the keypad, causes the Lock output to latch low and the Arm output to momentarily go high. Whenever power is first applied to the LS7222, the circuit defaults to the Arm code corresponding to the keys X1Y1, X1Y2, X2Y2, X2Y1. 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 Disarm code, when entered from the keypad, causes the Lock output to latch high and the Disarm output to momentarily go high. The first 3 digits of the Disarm code must be identical to the first 3 digits of the Arm 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, i.e. the same code is chosen for arming and disarming, the entry of the code will cause the Lock output to toggle. This means that if the output was high (unlocked) it will go low (locked) and vice-versa. When- ever power is first applied to the LS7222, the circuit defaults to the Disarm code corresponding to the keys X1Y1, X1Y2, X2Y2, X1Y1. The code can then be altered by entering the Program mode. 3. The Duress code, when entered from the keypad, causes the Lock output to latch high and the Disarm output to momentarily go high; 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 Arm and Disarm codes; the 4th digit must be different to activate the Alarm output. Whenever power is first applied to the LS7222, the circuit defaults to the Duress code corresponding to the keys X1Y1, X1Y2, X2Y2, X1Y2. The code can then be 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 DISARM ALARM TAMPER CAP-M PROGRAM ARM VSS (-V) RC-OSC X1 X2 X3 X4 Y1 Y2 Y3 Y4 FIGURE 1 January 2003 7222-012703-1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS7222 UL ® A3800 |
Codice articolo simile - LS7222_03 |
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Descrizione simile - LS7222_03 |
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