LSI Computer Systems LS7222
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. 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).| Part No. | LS7222 |
|---|---|
| Datasheet | LS7222 Download |
| Manufacturer |  LSI Computer Systems |
| Description | KEYPAD PROGRAMMABLE DIGITAL LOCK |
| Buy | Stock & Price |
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
: Input is provided by a matrix keypad whose maximum allowable size is 4 x 4. 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. DETAILEDDESCRIPTION
: CODES - There are 3 different function codes which the LS7222 can store in memory. Each code consists of a 4digit 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.
