LS7223

LSI/CSI UL ® LS7223 (631) 271-0400 FAX (631) 271-0405 December 2002 LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 A3800 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 electromechanical locks. Input is provided by a matrix keypad whose maximum allowable size is 4 x 4. CONNECTION DIAGRAM - TOP VIEW V SS (-V) RC-OSC X1 X2 X3 X4 Y1 Y2 Y3 Y4 1 2 3 4 20 V DD (+V) 19 CAP-K 18 LOCK DISPLAY 17 LOCK 1 LSI LS7223 5 6 7 8 9 10 16 LOCK 2 15 ALARM 14 MOM 13 12 TAMPER CAP-M 11 PROGRAM FIGURE 1 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 2. The Secondary code, when entered from the keypad, causes the Lock 2 output to toggle. The first 3 is done via the keypad inputs. Any entry from the keypad digits of the Secondary code mus...