TXE-Xxx-KH Manual 12-31-04.Qxd
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TXE-315-KH TXE-418-KH TXE-433-KH WIRELESS MADE SIMPLE KH SERIES TRANSMITTER/ENCODER DATA GUIDE DESCRIPTION The KH Series is ideally suited for volume use in OEM applications such as remote 1.220" control/command and keyless entry. It combines a highly optimized RF transmitter with an on-board encoder. When paired with a 0.630" RF TRANSMITTER/ENCODER matching KH series receiver / decoder module, TXE-418-KH a highly reliable wireless link is formed, capable LOT 2000 of transferring the status of 8 parallel inputs for distances in excess of 300 feet. Ten tri-state address lines provide 310 addresses for security and uniqueness. Housed in a compact 0.18" SMD package, the KH transmitter utilizes a SAW architecture to achieve an unmatched blend of performance, size, and cost. No Figure 1: Package Dimensions external RF components, except an antenna, are required, making integration straightforward. FEATURES Low cost Ultra-low power consumption On-board encoder Compact SMD Package 8 parallel binary outputs Stable SAW-based architecture 310 addresses for security and Adjustable output power uniqueness Transmit enable line No external RF components No production tuning required APPLICATIONS INCLUDE Remote Control / Command ORDERING INFORMATION Keyless Entry PART # DESCRIPTION Garage / Gate Openers EVAL-***-KH Basic Evaluation Kit Lighting Control TXE-315-KH Transmitter 315 MHz Call Systems TXE-418-KH Transmitter 418 MHz Home / Industrial Automation TXE-433-KH Transmitter 433 MHz Fire / Security Alarms RXD-315-KH Receiver 315 MHz Remote Status Monitoring RXD-418-KH Receiver 418 MHz Wire Elimination RXD-433-KH Receiver 433 MHz *** Insert Frequency Transmitters are supplied in tubes of 20 pcs. Revised 12/31/04 ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Designation Min. Typical Max. Units Notes Supply voltage VCC -0.3 to +6.0 VDC POWER SUPPLY Any input or output Pin -0.3 to VCC VDC Operating Voltage V – – CC 2.7 5.2 VDC Operating temperature -30 to +70 °C Storage temperature -45 to +85 °C Supply Current ICC – 1.5 – mA 1, 4 Soldering temperature +225°C for 10 seconds Power-down Current IPDN – 1 – µA – TRANSMITTER SECTION *NOTE* Exceeding any of the limits of this section may lead to permanent damage to the device. Furthermore, extended operation at these maximum Transmit Frequency Range FC ratings may reduce the life of this device. TXM-315-KH – 315 – MHz – TXM-418-KH – 418 – MHz – PERFORMANCE DATA TXM-433-KH – 433.92 – MHz – – – – These performance parameters are Center Frequency Accuracy -75 +75 kHz VCC Output Power PO -4 +2 +4 dBm 3 based on module operation at 25°C Harmonic Emissions 1 GND/LVL ANT 24 from a 3.0VDC supply unless 2 23 -40 – – – D0 GND TXM-315-KH dBc otherwise noted. Figure 2 at the right 3VDC 3 D1 A9 22 4 TXM-418-KH -40 – – dBc – GND A8 21 illustrates the connections 5 VCC A7 20 TXM-433-KH -45 – – dBc – 6 TE A6 19 necessary for testing and operation. 7 D2 A5 18 ANTENNA PORT It is recommended all ground pins 8 D3 A4 17 9 D4 A3 R – – 4 16 RF Input Impedance IN 50 Ω be connected to the groundplane. 10 D5 A2 15 11 D6 A1 14 ENCODER 12 D7 A0 13 Data Length – – 26 bits 3x – – – Average Data Duty Cycle – – 50% – – 4 Figure 2: Test/Basic Application Circuit Encoder Oscillator FENC – 70 – kHz 4 Data Input TYPICAL PERFORMANCE GRAPHS Logic Low – 0 – 0.2xVcc VDC 4 +8 Logic High Vccx0.8 – Vcc VDC 4 12 With LADJ tied to ground 11 +7 Input Sink Current – 0.6 1 1.2 mA 4 +6 10 +5 ENVIRONMENTAL 9 +4 8 +3 Operating Temperature Range – -30 – +70 °C4 7 +2 6 With LADJ tied to ground +1 5 0 Table 1: KH Series Transmitter Electrical Specifications -1 4 -2 3 -3 Ω 2 -4 With 430 resistor on LADJ Notes Supply Current (mA) 1 Ω -5 1. Current draw with 50% mark/space ratio. With 430 resistor on LADJ -6 0 Output Power Into 50 ohms (dBm) 2. Into a 50Ω load. -7 2.5 3.0 3.5 4.0 4.5 5.0 2.5 3. With 430 resistor on LADJ. 3.0 3.5 4.0 4.5 5.0 Ω Supply Voltage (V) 4. Characterized, but not tested. Supply Voltage (V) Figure 3: Supply Current vs Supply Voltage Figure 4: Output Power vs Supply Voltage +8 +7 +6 +5 *CAUTION* +4 +3 This product incorporates numerous static-sensitive components. +2 5V Always wear an ESD wrist strap and observe proper ESD handling +1 procedures when working with this device. Failure to observe this 0 -1 3V Output Power (dBm) precaution may result in module damage or failure. -2 -3 -4 51 100 150 200 240 300 360 430 510 560 620 680 750 820 910 1.1K LADJ Pin Resistor Value (Ω) Figure 5: Output Power vs LADJ Resistor Page 2 Page 3 PIN ASSIGNMENTS MODULE DESCRIPTION The KH Series transmitter / encoder module combines a high-performance 1 LADJ/GND ANT 24 Surface Acoustic Wave (SAW) based transmitter with an on-board encoder. 2 D0 GND 23 When combined with a Linx KH Series receiver / decoder a highly reliable RF link 3 D1 A9 22 capable of transferring control or command data over line-of-sight distances in 4 GND A8 21 excess of 300 feet (90m) is formed. The module accepts up to 8 parallel inputs, 5 VCC A7 20 such as switches or contact closures, and provides ten tri-state address lines for 6 TE A6 19 security and creation of 310 or 59,049 unique transmitter / receiver relationships. 7 D2 A5 18 The KH’s compact surface-mount package integrates easily into existing designs 817D3 A4 and is friendly to hand production or automated assembly. 9 D4 A3 16 10 D5 A2 15 Address Inputs 11 D6 A1 14 A0-A9 TX Enable 12D7 A0 13 SAW 50 RF OUT Oscillator Parallel Divider Figure 6: KH Series Transmitter Pinout (Top View) (Ant.) OSC Inputs D0-D7 Sync Counter Keyed Output PIN DESCRIPTIONS GATE TRI-Detect Pin # Name Description Output Isolation RF Amplifier Buffer & Filter Level Adjust. This line can be used to adjust the output power level of the transmitter. Connecting to GND will give RF STAGE ENCODER STAGE 1 GND/LADJ the highest output, while placing a resistor to GND will lower the output level. Figure 7: KH Series Transmitter Block Diagram Data Input Lines. When TE goes high, the module will THEORY OF OPERATION 2, 3 & encode the state of these lines for transmission. Upon D0 - D1 The KH Series transmitter operation is straightforward. When the Transmit 7 - 12 receipt of a valid transmission, the receiver / decoder will Enable (TE) line is taken high, the on-board encoder IC is activated. The encoder replicate these lines on its output lines. detects the logic states of the data and address lines. These states are formatted into a 3-word transmission, which continues until the TE line is taken low. The 4 GND Analog Ground encoder creates a serial data packet that is used to modulate the transmitter. 5 VCC Supply Voltage The KH transmitter section is based on a simple but highly optimized architecture that achieves a high fundamental output power with low harmonic content. This Transmit Enable Line. When this line goes high the module ensures that most approval standards can be met without external filter 6 TE will encode the states of the address and data lines into a components. The KH transmitter is exceptionally stable over variations in time, packet and transmit the packet three times. temperature, and physical shock as a result of the precision SAW device that is incorporated as the frequency reference. Address Lines. The state of these lines must match the The transmitted signal may be received by any Linx KH Series receiver / decoder 13-22 A0 - A9 state of the receiver’s address lines in order for a module or Linx LC or LR Series receiver combined with the appropriate decoder transmission to be accepted. IC. Once data is received it is decoded using a decoder IC or custom microcontroller. The transmitted address bits are checked against the address settings of the receiving device. If a match is confirmed, the decoder’s outputs 23 GND Analog Ground are set to replicate the transmitter’s inputs. 24 ANT 50-ohm RF Output Page 4 Page 5 ENCODER OPERATION POWER SUPPLY REQUIREMENTS The KH Series transmitter internally utilizes The module does not have an internal voltage Power On Vcc TO the HT640 encoder from Holtek. The encoder regulator; therefore it requires a clean, well-regulated MODULE begins a three-word transmission cycle when power source. While it is preferable to power the unit 10Ω the Transmission Enable line (TE) is pulled from a battery, the unit can also be operated from a Vcc IN high. This cycle will repeat itself for as long as Standby Mode power supply as long as noise and ‘hash’ are less than + µ the TE line is held high. Once TE falls low, the 20mV. Power supply noise will manifest itself as noise 10 F encoder output completes its final cycle and and can significantly affect the receiver sensitivity, No Transmission then stops as shown in the Encoder/Decoder Enabled? therefore, providing a clean power supply for the Timing diagram. When a transmission enable module should be a high design priority. Figure 10: Supply Filter Yes signal is applied, the encoder scans and A 10Ω resistor in series with the supply followed by a 10µF tantalum capacitor transmits the status of the 10 bits of the 3 Data Words from Vcc to ground will help in cases where the quality of supply power is poor.