LS7223 datasheet, PDF - EEWORLD Datasheet

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LS7223: DescriptionKEYPAD PROGRAMMABLE DIGITAL LOCK; File Size29KB，4 Pages; ManufacturerLSC/CSI; Websitehttps://lsicsi.com

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LS7223 Overview

KEYPAD PROGRAMMABLE DIGITAL LOCK

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LSI/CSI

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 (V

-V

)

• 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.

CONNECTION DIAGRAM -

TOP VIEW

(-V)

RC-OSC

(+V)

CAP-K

LOCK DISPLAY

LOCK 1

LSI

LS7223

LOCK 2

ALARM

MOM

TAMPER

CAP-M

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 key-

pad, 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 must be identical to the

(when not in the program mode) which does not match one of

first 3 digits of the Primary code; the 4th digit may or

the 3 programmed codes causes the Tamper output to

may not be identical for the two codes. When the

become active.

two codes are the same in all 4 digits, the entry of

the code will cause both the Lock 1 and the Lock 2

The monolithic, low power CMOS design of the LS7223

outputs to toggle. Whenever power is first applied

enables it to be designed into typical battery backed-up and

to the LS7223, the circuit defaults to the Secondary

automotive type security systems.

code corresponding to the keys X1 Y1, X1 Y2, X2

Y2, X1 Y1. The code can then be altered by

DETAILED DESCRIPTION:

entering the Program mode.

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 3. The Duress code, when entered from the keypad,

causes the Lock 1 output to toggle; at the same time

the keypad entry enable time expires. The 3 codes and their

the Alarm output will latch high to enable an external

functions are explained below.

alarm. The first 3 digits of the Duress code must be

identical to the first 3 digits of the Primary and

1. The Primary code, when entered from the keypad, causes

Secondary codes; the 4th digit must be different to

the Lock 1 output to toggle and the Momentary output to

activate the Alarm output. Whenever power is first

momentarily go high. Whenever power is first applied to

applied to the LS7223, the circuit defaults to the

the LS7223, the circuit defaults to the Primary code

Duress code corresponding to the keys X1 Y1, X1

corresponding to the keys X1 Y1, X1 Y2, X2 Y2, X2 Y1.

Y2, X2 Y2, X1 Y2. The code can then be altered

The code can then be altered to any other 4 digit code by

the same way as the other two codes.

entering the Program mode and keying in the new code.

7223-121102-1

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