MOTOROLA Freescale Semiconductor, Inc. Order Number: MC33492/D Rev. 3.3, 06/2001 Semiconductor Technical Data TANGO3 MC33492 Preliminary Freescale Semiconductor, Inc... • • • • • • • • • • • Switchable frequency bands 315-434MHz and 868MHz OOK modulation Adjustable output power range Fully integrated VCO Supply voltage range: 1.9-3.6V Very low standby current: 0.1nA @ TA =25°C Low supply voltage shutdown Data clock output for microcontroller Extended temperature range: -40°C to 125°C Low external component count Typical application compliant with ETSI standard Non Disclosure Agreement Required PLL Tuned UHF Transmitter for Data Transfer Applications PIN CONNECTIONS DATACLK 1 14 MODE DATA 2 13 ENABLE BAND 3 12 VCC GND 4 11 GNDRF XTAL1 5 10 RFOUT XTAL0 6 9 VCC REXT 7 8 CFSK Ordering Information Device Ambiant Temperature Range Package MC33492 DTB -40°C to 125°C TSSOP14 Figure 1: Simplified block diagram This document contains information on a new product under development. Motorola reserves the right to change or discontinue this product without notice. © Motorola, Inc., 2001. All rights reserved. For More Information On This Product, Go to: www.freescale.com TM MC33492 Freescale Semiconductor, Inc. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DATACLK DATA BAND GND XTAL1 XTAL0 REXT CFSK VCC RFOUT GNDRF VCC ENABLE MODE Description Clock output to the microcontroller Data input Frequency band selection Ground Reference oscillator input Reference oscillator output Power amplifier output current setting input Non connected Power supply Power amplifier output Power amplifier ground Power supply Enable input Modulation type selection input Non Disclosure Agreement Required Freescale Semiconductor, Inc... PIN FUNCTION DESCRIPTION ABSOLUTE MAXIMUM RATINGS Parameter Symbol Value Unit VCC VGND - 0.3 to 3.7 V VGND - 0.3 to VCC + 0.3 V ESD HBM Voltage Capability on Each Pin (note 1) ±2000 V ESD MM Voltage Capability on Each Pin (note 2) ±150 V 260 °C Supply Voltage Voltage Allowed on Each Pin Solder Heat Resistance Test (10 s) Storage Temperature Ts -65 to +150 °C Junction Temperature Tj +150 °C Notes: 1 Human Body model, AEC-Q100-002 Rev. C. 2 Machine Model, AEC-Q100-003 Rev. D. For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 2 MC33492 Freescale Semiconductor, Inc. TRANSMITTER FUNCTIONAL DESCRIPTION MC33492 is a PLL tuned low power UHF transmitter. The different modes of operation are controlled by the microcontroller through several digital input pins. The power supply voltage ranges from 1.9V to 3.6V allowing operation with a single lithium cell. PHASE LOCKED LOOP AND LOCAL OSCILLATOR The VCO is a completely integrated relaxation oscillator. The Phase Frequency Detector (PFD) and the loop filter are fully integrated. The exact output frequency is equal to: fRFOUT = fXTAL x PLL divider ratio. The frequency band of operation is selected through the BAND pin. Table 1: Frequency band selection and associated divider ratios Frequency PLL divider Crystal oscillator BAND input level band (MHz) ratio frequency (MHz) 315 9.84 High 32 434 13.56 Low 868 64 Non Disclosure Agreement Required Freescale Semiconductor, Inc... Table 1 provides details for each frequency band selection. An out-of-lock function is performed by monitoring the PFD output voltage. When it exceeds its limits, the RF output stage is disabled. RF OUTPUT STAGE The output stage is a single ended square wave switched current source. Harmonics will be present in the output current drive. Their radiated absolute level depends on the antenna characteristics and output power. Typical application demonstrates compliance to ETSI standard. A resistor Rext connected to the REXT pin controls the output power allowing a tradeoff between radiated power and current consumption. The output voltage is internally clamped to Vcc ±2Vbe (typ. Vcc ±1.5V @ TA=25°C). MODULATION A low logic level has to be applied on pin MODE, to select the On Off Keying (OOK) modulation. This modulation is performed by switching on/off the RF output stage. The logic level applied on pin DATA controls the output stage state: DATA=0 -> output stage off DATA=1 -> output stage on MICROCONTROLLER INTERFACE Four digital input pins (ENABLE, DATA, BAND and MODE) enable the circuit to be controlled by a microcontroller. It is recommended to configure the band frequency and the modulation type before enabling the circuit. In a typical application the input pin MODE is hardwired to ground. To reduce total current consumption, it is recommended to connect pin BAND according to the following table 2. Table 2: Digital pins connecting recommendation 434MHz Frequency band BAND = I/O or ENABLE 868MHz Frequency band BAND = GND One digital output (DATACLK) provides to the microcontroller a reference frequency for data clocking. This frequency is equal to the crystal oscillator frequency divided by 64 (see table 3). Table 3: DATACLK frequency versus crystal oscillator frequency Crystal oscillator frequency (MHz) DATACLK frequency (kHz) 9.84 154 13.56 212 For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 3 MC33492 Freescale Semiconductor, Inc. STATE MACHINE Figure 2 details the main state machine. Figure 2: Main state machine Power ON AND ENABLE=0 State 1 Standby mode ENABLE=1 State 2 PLL enabled but out of lock in range PLL in lock in range ENABLE=0 Non Disclosure Agreement Required Freescale Semiconductor, Inc... ENABLE=0 State 6 Shutdown mode VBattery < VShutdown State 4 Transmission mode PLL out of lock in range PLL in lock in range State 5 PLL out of lock in range No RF output State 1: The circuit is in standby mode and draws only a leakage current from the power supply. State 2: In this state, the PLL is enabled but out of the lock in range. Therefore the RF output stage is switched off preventing any data transmission. Data clock is available on pin DATACLK. In normal operation, this state is transitional. State 4: In this state, the PLL is within the lock in range. If t<tPLL_lock_in then the PLL can still be in acquisition mode. If t≥tPLL_lock_in then the PLL is locked. Data entered on pin DATA is output on pin RFOUT. State 5: An out-of-lock condition has been detected. The RF output stage is switched off preventing any data transmission. Data clock is still available on pin DATACLK. State 6: When the supply voltage falls below the shutdown voltage threshold (VSDWN), the whole circuit is switched off. Applying a low level on pin ENABLE is the only condition to get out of this state. For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 4 MC33492 Freescale Semiconductor, Inc. Figure 3 shows the waveforms of the main signals for a typical application cycle Figure 3: Signals waveforms and timings definition ENABLE DATACLK tDATACLK_settling tPLL_lock_in Freescale Semiconductor, Inc... fcarrier fcarrier RFOUT State 1 State 2 Non Disclosure Agreement Required DATA State 4 State 1 : PLL locked POWER MANAGEMENT When the battery voltage falls below the shutdown voltage threshold (VSDWN) the whole circuit is switched off. It has to be noted that after this shutdown, the circuit is latched until a low level is applied on pin ENABLE (see state 6 of the state machine). DATA CLOCK At start-up data clock timing is valid after the data clock settling time. As clock is switched off asynchronously the last period length cannot be guaranteed. For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 5 MC33492 Freescale Semiconductor, Inc. ELECTRICAL CHARACTERISTICS Unless otherwise specified: Vcc=3V, Rext=12kΩ, operating temperature range TA=-40°C to +125°C, RF output frequency fcarrier=433.92MHz, reference frequency freference=13.56MHz, output load = 50Ω resistor (see figure 7). Values refer to the circuit shown in the recommended application schematic (see figure 10). Typical values reflect average measurement at VCC=3V and TA=25°C. Limits Parameter Unit Min. Typ. Max. TA≤25°C - 0.1 5 nA TA=60°C - 7 30 nA TA=85°C - 40 100 nA 1.4 TA=125°C - 800 1700 nA 1.7 315 & 434 bands, continuous wave, TA=25°C - 11.6 13.5 mA 1.5 315 & 434 bands, DATA=0, -40°C≤TA≤125°C - 4.4 6.0 mA 868MHz band, DATA=0, -40°C≤TA≤125°C - 4.6 6.2 mA 1.8 315 & 434 bands, continuous wave, -40°C≤TA≤125°C - 11.6 14.9 mA 1.9 868MHz band, continuous wave, -40°C≤TA≤125°C - 11.8 15.1 mA - 3 3.6 V General Parameters 1.1 1.2 1.3 1.6 1.10 Supply Current in Standby Mode Supply Current in Transmission Mode Supply Voltage 1.11 TA=-40°C - 2.04 2.11 V 1.12 TA=-20°C - 1.99 2.06 V TA=25°C - 1.86 1.95 V TA=60°C - 1.76 1.84 V 1.15 TA=85°C - 1.68 1.78 V 1.16 TA=125°C - 1.56 1.67 V 1.13 1.14 Shutdown Voltage Threshold For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications Non Disclosure Agreement Required 1 Freescale Semiconductor, Inc... Test Conditions, Comments 6 MC33492 Freescale Semiconductor, Inc. ELECTRICAL CHARACTERISTICS Unless otherwise specified: Vcc=3V, Rext=12kΩ, operating temperature range TA=-40°C to +125°C, RF output frequency fcarrier=433.92MHz, reference frequency freference=13.56MHz, output load = 50Ω resistor (see figure 7). Values refer to the circuit shown in the recommended application schematic (see figure 10). Typical values reflect average measurement at VCC=3V and TA=25°C. Limits Parameter Freescale Semiconductor, Inc... 2.1 Unit Min. Typ. Max. 12 - 21 kΩ RF Parameters Rext value 2.2 315 & 434MHz bands, with 50Ω matching network - 5 - dBm 2.3 868MHz band, with 50Ω matching network - 1 - dBm 2.4 315 & 434MHz bands, -40°C≤TA≤125°C -3 0 3 dBm 2.8 868MHz band, -40°C≤TA≤125°C -7 -3 0 dBm 315 & 434MHz bands, with 50Ω matching network - -0.35 - dB/kΩ mA/kΩ 315 & 434MHz bands, with 50Ω matching network - -34 - dBc 868MHz band, with 50Ω matching network - -49 - dBc 2.15 315 & 434MHz bands - -23 -17 dBc 2.16 868MHz band - -38 -27 dBc 2.17 315 & 434MHz bands, with 50Ω matching network - -32 - dBc 868MHz band, with 50Ω matching network - -57 - dBc 2.19 315 & 434MHz bands - -21 -15 dBc 2.20 868MHz band - -48 -39 dBc 315 & 434MHz bands - -36 -24 dBc 868MHz band - -29 -17 dBc 315 MHz band - -37 -30 dBc 434MHz band - -44 -34 dBc 868MHz band - -37 -27 dBc 315MHz band - -62 -53 dBc 434MHz band - -80 -60 dBc 868MHz band - -45 -39 dBc 315 & 434MHz bands, ±175kHz from f carrier - -75 -68 dBc/Hz 868MHz band, ±175kHz from f carrier - -73 -66 dBc/Hz fcarrier within 30kHz from the final value, crystal series resistor=150Ω - 350 1500 µs Output Power 2.12 Current & Output Power Variation vs Rext value 2.13 2.14 2.18 2.21 2.22 2.23 2.24 2.25 2.41 2.26 2.27 Harmonic 2 Level Harmonic 3 Level Spurious Level @ fcarrier ±f DATACLK Spurious Level @ fcarrier ±f reference Spurious Level @ fcarrier/2 2.30 Phase Noise 2.31 2.32 PLL Lock in Time, tPLL_lock_in For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 7 Non Disclosure Agreement Required 2 Test Conditions, Comments MC33492 Freescale Semiconductor, Inc. ELECTRICAL CHARACTERISTICS Unless otherwise specified: Vcc=3V, Rext=12kΩ, operating temperature range TA=-40°C to +125°C, RF output frequency fcarrier=433.92MHz, reference frequency freference=13.56MHz, output load = 50Ω resistor (see figure 7). Values refer to the circuit shown in the recommended application schematic (see figure 10). Typical values reflect average measurement at VCC=3V and TA=25°C. Limits Test Conditions, Comments Unit Min. Typ. Max. 2.33 XTAL1 Input Capacitance - 1 - pF 2.34 Crystal Resistance - 20 200 Ω 2.35 Modulation Depth 75 90 - dBc 2.40 Data Rate Manchester coded - - 10 kBd 2.41 Data to RF delay difference between falling and rising edges From 50% of data edge to corresponding RF signal enveloppe edge (see note 1) 3 5 8 µs 0 - 0.3 x VCC V 0.7 x VCC - VCC V - - 150 mV - - 100 nA Non Disclosure Agreement Required Freescale Semiconductor, Inc... Parameter Note 1: This parameter can have a slight impact on data duty cycle. 3 Microcontroller Interfaces 3.1 Input Low Voltage 3.2 Input High Voltage 3.3 Input Hysteresis Voltage 3.4 Input Current 3.5 ENABLE Pull Down Resistor - 180 - kΩ 3.6 DATACLK Output Low Voltage 0 - 0.25 x VCC V 0.75 x VCC - VCC V Cload = 2pF, measured from 20% to 80% of the voltage swing - 250 500 ns - 150 400 ns 45% < Duty Cycle fDATACLK < 55% - 800 1800 µs Pins BAND, MODE, ENABLE, DATA Pins BAND, MODE, DATA = 1 Cload = 2pF 3.7 DATACLK Output High Voltage 3.8 DATACLK Rising Time 3.9 DATACLK Falling Time 3.10 DATACLK Settling Time, tDATACLK_settling For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 8 MC33492 Freescale Semiconductor, Inc. RF OUTPUT SPECTRUM Following are spectrums of transmitter carrier, measured in conduction. Three different spans have been used. The 5MHz span spectrum (figure 4) shows phase noise response close to the RF carrier, and the noise suppression within the PLL loop bandwidth. The 50MHz span spectrum (figure 5) shows both phase noise and reference spurious. Finally figure 6 shows second and third harmonics of carrier. All these spectrums are measured in OOK modulation, at DATA=1. Resolution bandwidth: 100kHz Non Disclosure Agreement Required Freescale Semiconductor, Inc... Figure 4: RF spectrum at 434MHz frequency band displayed with a 5MHz span Resolution bandwidth: 30kHz For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 9 MC33492 Freescale Semiconductor, Inc. Non Disclosure Agreement Required Freescale Semiconductor, Inc... Figure 5: RF spectrum at 434MHz frequency band displayed with a 50MHz span Figure 6: RF spectrum at 434MHz frequency band displayed with a 1.5GHz span For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 10 MC33492 Freescale Semiconductor, Inc. OUTPUT POWER MEASUREMENT The RF output levels given in the electrical characteristics section are measured whith a 50Ω load directly connected to the pin RFOUT as shown below in figure 7. This wideband coupling method gives results independant of the application. Figure 7: Output power measurement configurations VCC Impeder: TDK MMZ1608Y102CTA00 RFOUT RF output Freescale Semiconductor, Inc... 50 Ω The configuration shown in figure 8-a provides a better efficiency in terms of output power and harmonics rejection. Schematic on figure 8-b gives the equivalent circuit of the pin RFOUT and impeder as well as the matching network components for 434MHz frequency band. Note that the impeder is moved to the load side to decrease its influence (similar to DC bias through the antenna). Figure 8: Ouput characteristic and matching network for 434MHz frequency band VCC Impeder: TDK MMZ1608Y102CTA00 RFOUT RF Output Matching Network (a) 50 Ω Matching network 330pF L1 39nH (b) C3 50Ω 3kΩ C0 1.5pF R0 250Ω Ri RL Impeder Load RFOUT pin Figure 9 gives the output power versus the Rext resistor value with 50Ω load and with matching network. For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 11 Non Disclosure Agreement Required 100pF MC33492 Freescale Semiconductor, Inc. Figure 9: Output power at 434MHz frequency band versus Rext value Output power measurement in typical conditions (434MHz - Vcc=3V - 25°C) REXT SPECIFIED RANGE 8 6 Output power when matched (dBm) -0.35db/kΩ # -0.35mA/kΩ 4 2 RFOUT Level (dBm) Non Disclosure Agreement Required Freescale Semiconductor, Inc... 0 -2 Output power on 50Ω load (dBm) -4 -6 6 9 12 15 Rext (kΩ ) 18 21 24 The 50Ω matching network used for the 868MHz band is similar to the 434MHz, except components values: L1 is changed to 8.2nH and C3 to 470pF The expected gain of this 868MHz matching network is 4dB (typical) compared to unmatched boards. For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 12 MC33492 Freescale Semiconductor, Inc. APPLICATION SCHEMATIC Figures 10 show application schematic for the 315 & 434MHz frequency bands. For 868MHz band application, the input pin BAND must be wired to ground. See component description on table 4. Component Y1 R2 C6 C10 C7 C8 C11 Table 4: External components description Function Value For 315MHz band: 9.84, see table 5 For 434MHz band: 13.56, Crystal see table 5 For 868MHz band: 13.56, see table 5 RF output level setting 12 resistor (Rext) Crystal load capacitor Power supply decoupling capacitor Low pass filter capacitor for spurious reduction at ±freference Non Disclosure Agreement Required Freescale Semiconductor, Inc... Figure 10: Application schematic for 315 & 434MHz frequency bands Unit MHz MHz MHz kΩ 8.2 4.7 22 100 pF µF nF pF 47 pF Examples of crystal reference are given below (see characteristics on table 5) for different application bands: - at 315MHz band (freference = 9.84375MHz, -40°C≤TA≤85°C): NDK LN-G102-950, - at 434/868MHz bands (freference = 13.56MHz, -40°C≤TA≤125°C): NDK NX8045GA S1-40125-8050-12 Table 5: Recommended crystal characteristics (SMD ceramic package) Parameter NDK LN-G102-950 (315MHz) NDK S1-40125-8050-12 (434 & 868MHz) Load capacitance 12 12 Motional capacitance 3.33 4.4 Static capacitance 1.05 1.5 Loss resistance 28 18.5 For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications Unit pF fF pF Ω 13 MC33492 Freescale Semiconductor, Inc. COMPLETE APPLICATION SCHEMATIC WITH PCB Figure 11 gives a complete application schematic using a Motorola MC68HC908RK2 microcontroller. fcarrier= 433.92MHz. C2 to C5 capacitors can be removed if switches debounce is done by software. Figure 11: Complete application schematic for 434MHz frequency band Vbat SW1 SW1a SW2a SW2 Vbat LED1 1 B1 C2 C3 C4 C5 2.2nF 2.2nF 2.2nF 2.2nF 2 R1 750 Vbat U1 2 3 Freescale Semiconductor, Inc... U2 1 2 3 4 5 6 7 8 9 10 PTA0 PTA1/KBD1 PTB0/MCLK PTA2/KBD2 PTB1 PTA3/KBD3 PTB2/TCH0 PTA4/KBD4 PTB4/TCH1 PTA5/KBD5 PTB5 PTA6/KBD6 PTB3/TCLK PTA7 OSC1 RST OSC2 IRQ1 VSS VDD MC68HC908RK2 4 C6 8.2pF 20 5 19 Y1 6 18 13.56MHz 7 17 R2 16 DATACLK DATA BAND MODE ENABLE VCC GND GNDRF XTAL1 RFOUT XTAL0 VCC REXT CFSK MC33492 12K 14 C7 22nF Non Disclosure Agreement Required 1 13 12 11 10 9 C9 2.2pF 8 C8 100pF 15 14 13 12 11 Vbat C8 100nF Figure 12 shows a two buttons keyfob board. Real size is 30 x 45 millimeters. Figure 12: Two button keyfob board layout Battery For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 14 MC33492 Freescale Semiconductor, Inc. CASE OUTLINE DIMENSIONS 14X K REF NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7. DIMENSION A AND B ARE TO BE 0.15 (0.006)T U S N 2X L/2 14 0.25 (0.010) 8 M B -U- L PIN 1 IDENT. F 7 1 0.15 (0.006)T U S Freescale Semiconductor, Inc... N DETAIL E K A -V- K1 J J1 SECTION N-N -W- C 0.10 (0.004) -T- SEATING D PLANE G H DETAIL E DIM A B C D F G H J J1 K K1 L M MILLIMETERS MIN MAX 4.90 5.10 4.30 4.50 --1.20 0.05 0.15 0.50 0.75 0.65 BSC 0.50 0.60 0.09 0.20 0.09 0.16 0.19 0.30 0.19 0.25 6.40 BSC 0° 8° INCHES MIN MAX 0.193 0.200 0.169 0.177 --- 0.047 0.002 0.006 0.020 0.030 0.026 BSC 0.020 0.024 0.004 0.008 0.004 0.006 0.007 0.012 0.007 0.010 0.252 BSC 0° 8° Non Disclosure Agreement Required 0.10 (0.004)M T U S V S CASE 948G-01 ISSUE O For More Information On This Product, Go to: www.freescale.com PLL Tuned UHF Transmitter for Data Transfer Applications 15 Motorola reserves the right to make changes without further notice to any products herein. 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