POWER SUPPLY
SWITCHING POWER SUPPLY
The XL1509 is a 150 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of
driving a 2A load with high efficiency, low ripple and excellent line and load regulation.
Referring to schematic diagram figure 1, input voltage range from DC12V to DC24V step down to
DC9V , then output to RELAY unit and 78M05 regulator.
5V VOLTAGE REGULATOR
78M05 provide a stable voltage (DC5V) to MCU unit.
BACK-LIT JUMPER
Connecon Terminals
Terminals No.
Common ground output
Keypad Acve Output - NPN Transistor ground output , max.
100mA@24VDC
Duress Output – NPN Transistor ground output, max.
100mA@24VDC. Triggers a silent alarm or other device when the
user enters a duress code.
Door Sensor – Connect to an oponal N.C. sensor such as a
magnec contact to monitor if the door Output 1 is open or
closed. Connect to ground if not used.
Output 1 Inhibit – N.O. input, connected to Interlock control of
second keypad if needed so that if one keypad is used to open a
door Output 1 , the other is temporarily disabled.
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.
Tamper switch output – N.C. contact , max. 50mA@24VDC.
Connect to the N.C. 24-hour protecon zone of an alarm if needed.
Egress In - N.O. Push buon contact to ground, Press buon to
Iniate door unlock Output 1
T9
T10
T11
T13
T15
T16
Terminal Name
EG IN
KEY ACT
DU OUT
T12 GND
DOOR SENS
T14 O/P 1 INHIB.
INT. LOCK
Tamper
T17 Tamper
Descripon
Connecon Terminals
Terminals No.
T1 Connect to 12 – 24V AC or
DC Power supply.
Output 1 , N.C./COM/N.O. ,
relay output,
Max. 1A@24VDC
Output 2 , N.C./COM/N.O.
, relay output,
Max. 1A@24VDC
T2
T3
T4
T5
T6
T7
T8
Terminal Name
12-24V AC/DC
GND
Output 1 N.C.
Output 1 COM
Output 1 N.O.
Output 2 N.C.
Output 2 COM
Output 2 N.O.
Descripon
THE DESCRIPTION
Description of the Block Diagram – SK-1123-SPQ
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) 2 groups of user codes for controlling output 1 & 2
4) Amber LED driver for the “Main/Status indicator”.
5) Red LED driver for the Output 2.
6) Dual LED function to indicate the status of Output 1 & inhibit.
7) The output port to give Keypad Active 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 MB95F696K
●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 1 circuit 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(U5A,U5B) 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.
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