LS7222

LSI/CSI UL ® LS7222 (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 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 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 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 monolithic, low power CMOS design of the LS7222 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 LS7222 can store in memory. Each code consists of a 4digit number w...