8 5
THE DESCRIPTION
Description of the Block Diagram – SK3133-PPQ
The key functions of the keypad are prepared with the software that programmed in the MCU. It
provides the following functions.
1) A keyboard for code entry.
2) 125Khz Proximity Card detection.
3) 3 groups of user codes for controlling output 1, 2 & 3
4) Amber (Middle) LED driver for the “Main/Status”.
5) Green/Red (Right) LED driver for Output 1 & Output 2.
6) Red (Left) LED driver for Inhibit.
7) The output port to give Keypad Active or Alarm function.
8) N.C. Tamper closed contact is allowed to connect.
9) A Normally Closed (N.C.) door sensing point with the help for monitors the open or close status of
the door.
10) Inter-lock output which gives signal to disable the partner keypad in an inter-lock system.
11) Output 1 Inhibit Control Input which mainly for the cross wire connection with the “Inter-lock O/P”
point of partner keypad in an inter-lock system.
12) Duress Output used for trigger an alarm zone of a security system or turn on a buzzer to notify
a guard.
13) A buzzer driver to provide pacific tones.
MCU - Fujitsu MB95F698K
●The operating voltage 5V
●Built-in low voltage detection reset circuit
The low-voltage detection reset circuit generates a reset signal if the power supply voltage falls
below the low-voltage detection voltage.
●CMOS I/O ports
●Lead-Free Packaging
E2PROM – AT24C256
●It is a memory device stores all the programming data from MCU.
●Up to 1200 users (codes/cards) storage.
125 KHZ CARD RECEIVERS
Referring figure 2 block diagram, MCU pin “125KHZ” continuously generate a 125 kHz square wave.
The antenna module takes a 125 kHz square wave input, buffers it, using two inverting
gates(U4A,U4B) and push pull amplifier(Q16~Q19), forming the carrier signal, and fed into an
antenna that transmits the carrier continuously toward any RFID tag(ANT) position above it.
The part of the filtering module's main purpose (U4C~U4F) is to filter out the carrier signal and any
noise that was picked up by the antenna.
The encoded signal is picked up by the reader's antenna, filtered, and processed on the embedded
microcontroller(pin EM_IN) to extract the tag's unique identity. At this point the identity can be
matched against the records stored on the reader.
It is compatible with ID cards of 64 bit read-only EM4100, TK4100, and EM4102 series. This module
outputs original card information (Manchester code) and ascii codes. Code format: Manufacturers
code + ID card number + parity bits.
Interlock control – N.O. input, connect to Output
1 Inhibit of second keypad if needed so that if
one keypad is used to open door Output 1, the
other is temporarily disabled.
T18 INT. LOCK
Tamper switch output – N.C. contact , max
50mA@24VDC, Connect to the N.C. 24 hour
T19 TAMPER
T20 TAMPER