전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

LS7222 데이터시트(PDF) 2 Page - LSI Computer Systems

부품명 LS7222
상세설명  KEYPAD PROGRAMMABLE DIGITAL LOCK
Download  4 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  LSI [LSI Computer Systems]
홈페이지  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7222 데이터시트(HTML) 2 Page - LSI Computer Systems

  LS7222 Datasheet HTML 1Page - LSI Computer Systems LS7222 Datasheet HTML 2Page - LSI Computer Systems LS7222 Datasheet HTML 3Page - LSI Computer Systems LS7222 Datasheet HTML 4Page - LSI Computer Systems  
Zoom Inzoom in Zoom Outzoom out
 2 / 4 page
background image
Program Mode - The current Arm/Disarm/Duress codes may be
altered to any value by initializing the Program mode. The steps
involved for altering the codes are:
1. Enter the current Disarm code causing the Disarm output to
go high.
2. Before the keypad entry enable time expires, enter the key
corresponding to matrix position X4 Y1 two times. This will
cause the Program Mode output to latch high, indicating that
the circuit is now in the Program mode. The keypad entry
enable timer is disabled during the Program mode.
3. Enter a 6-digit number from the keypad. The Program Mode
output will latch low, indicating that the new codes have suc-
cessfully been programmed. Of the 6 digits, the first 4 con-
stitute the Arm code; the first 3 and the 5th constitute the Dis-
arm code and the first 3 and the 6th constitute the Duress
code. If an error is introduced or it is desired to change the
codes before the 6th digit is typed, enter the key X4 Y3. This
will reset the internal memory pointer of the LS7222 and a
new 6-digit number can be entered.
KEYPAD INTERFACE - The four X inputs and four Y outputs are
designed for keypad interface (see Fig. 2). Since the X inputs have
internal pull-ups, the maximum matrix size of 4 x 4 does not have
to be
utilized. Because the Y outputs have open drains, more
than one LS7222 may share the same keypad.
During normal operation the LS7222 will scan the matrix looking for
a switch closure. Once a closure has been detected, the internal
key debounce logic determines if a "valid" key has been pressed or
that if noise is just present. Only one valid input will be generated
with any key closure. The use of internal key debouncing and
Schmitt triggers on the inputs provides the LS7222 with very high
noise immunity.
TAMPER - When a valid key has been detected by the LS7222,
the entry is compared against the appropriate reference in the inter-
nal memory. If the requirements of digit value and code sequential
position are not fulfilled, the Tamper output will momentarily go
high; this indicates that an illegal code entry was attempted. The
keypad entry enable timer and memory pointer will both be reset so
that entry of the code can be attempted again.
TABLE 1. PIN DESCRIPTIONS
PIN
FUNCTION
DESCRIPTION
1
Vss
Supply voltage negative.
2
RC-OSC
Determines the LS7222's internal clock frequency, which is used for keyboard scanning
and debounce. A resistor (to VDD) and a capacitor (to Vss) connected to this input sets
the frequency.
3, 4, 5, 6
X1, X2, X3, X4
The four X inputs and four Y outputs are designed to interface to a keypad matrix
7, 8, 9, 10
Y1, Y2, Y3, Y4
whose maximum allowable size is 4 by 4.
11
PROGRAM MODE
This output goes high when the program mode is initiated. It resets to a low state after the
6-digit Arm/Disarm/Duress combination code has been programmed.
12
CAP-M
A capacitor connected between this input and Vss controls the duration of the Arm,
Disarm and Tamper outputs.
13
TAMPER
Whenever a key is entered that is not a valid code element, this output goes high for a
period determined by the capacitor on the CAP-M input.
14
ARM
This output generates an active high output every time the Arm code is entered,
irrespective of whether the circuit is currently in the disarm state or not. The duration of
this output is determined by the capacitor on the CAP-M input. When the Arm and Disarm
codes are identical , this output will occur on every other code entry.
15
ALARM
When the Duress code is entered, this output latches high to enable an external alarm.
The Alarm output resets to a low state when the Arm code is entered again.
16
DISARM
This output generates an active high output every time the Disarm code is entered,
irrespective of whether the circuit is currently in the armed state or not. The duration of
this output is determined by the capacitor on the CAP-M input. When the Arm and Disarm
codes are identical , this output will occur on every other code entry.
17
LOCK
When the Disarm code or the Duress code is entered, this output latches high. When the
Arm code is entered, the output latches low. If the Disarm or Duress code is entered
when the output is already high (i.e. already disarmed), the output remains unaffected.
Similarly, if the Arm code is entered when the output is already low (i.e. already armed), it
remains unchanged. An exception to this rule is when the Arm and Disarm code identical
in all 4 digits. In that situation, the output will toggle every time the code is entered.
18
LOCK STATUS
Functionally, this output is identical to the LOCK output, with the exception that its polarity
is reversed with respect to the LOCK output. This output is intended for driving a display
lamp to indicate the lock status.
19
CAP-K
A capacitor connected between this input and Vss sets the time limit for entering a 4 digit
code from the keypad. (6 digits when initiating the program mode.)
20
VDD
Supply voltage positive.
7222-012901-2


유사한 부품 번호 - LS7222

제조업체부품명데이터시트상세설명
logo
LSI Computer Systems
LS7222 LSI-LS7222_03 Datasheet
53Kb / 4P
   KEYPAD PROGRAMMABLE DIGITAL LOCK
More results

유사한 설명 - LS7222

제조업체부품명데이터시트상세설명
logo
LSI Computer Systems
LS7223 LSI-LS7223_03 Datasheet
52Kb / 4P
   KEYPAD PROGRAMMABLE DIGITAL LOCK
LS7223 LSI-LS7223 Datasheet
28Kb / 4P
   KEYPAD PROGRAMMABLE DIGITAL LOCK
LS7222 LSI-LS7222_03 Datasheet
53Kb / 4P
   KEYPAD PROGRAMMABLE DIGITAL LOCK
logo
Cherry Semiconductor Co...
G844700LPBUS2 CHERRY-G844700LPBUS2 Datasheet
159Kb / 2P
   Keypad
logo
List of Unclassifed Man...
MCAK304NSSBWPMM ETC2-MCAK304NSSBWPMM Datasheet
206Kb / 2P
   Keypad
logo
Schurter Inc.
PIEZOKEYPADS SCHURTER-PIEZOKEYPADS Datasheet
547Kb / 4P
   Piezo Keypad
logo
ON Semiconductor
NLSF2500 ONSEMI-NLSF2500 Datasheet
138Kb / 5P
   Keypad Multiplexer
June, 2006 ??Rev. 2
logo
Omron Electronics LLC
E5AR-T OMRON-E5AR-T Datasheet
1Mb / 12P
   Programmable Digital Controller
E5ER-T OMRON-E5ER-T Datasheet
939Kb / 10P
   Programmable Digital Controller
logo
Dallas Semiconductor
DS1821 DALLAS-DS1821 Datasheet
570Kb / 16P
   Programmable Digital Thermostat
More results


Html Pages

1 2 3 4


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com