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  • High FSK Sensitivity: –105.5 dBm at 20 Kbits/s, –109 dBm at 2.4 Kbits/s (433.92 MHz)  High ASK Sensitivity: –111.5 dBm at 10 Kbits/s, –116 dBm at 2.4 Kbits/s (100% ASK Carrier Level, 433.92 MHz)  Low Supply Current: 10.5 mA in RX Mode  Data Rate 1 to 20 Kbits/s Manchester FSK, 1 to 10 Kbits/s Manchester ASK  ASK/FSK Receiver Uses a Low IF Architecture with High Selectivity, Blocking, and Low Intermodulation (Typical 3-dB Blocking 55.5 dBC at ±750 kHz/60.5 dBC at ±1.5 MHz and 67 dBC at ±10 MHz, System I1dBCP = –30 dBm/System IIP3 = –20 dBm)  Wide Bandwidth AGC to Handle Large Outband Blockers above the System I1dBCP  226-kHz IF (Intermediate Frequency) with 30-dB Image Rejection and 220-kHz System Bandwidth to Support TPM Transmitters using ATA5756/ATA5757 Transmitters with Standard Crystals  XTAL Tolerances Compensated by Fractional-N Synthesizer with 800 Hz RF Resolution  Single-ended RF Input  RSSI (Received Signal Strength Indicator)  Communication to Microcontroller with SPI Interface Working at 500 Kbits/s Maximum  Configurable Self Polling and RX/TX Protocol Handling with FIFO-RAM Buffering of Received Data  1 Push Button Input and 1 Wake-up Input are Active in Power-down Mode  Integrated XTAL Capacitors  Low In-band Sensitivity Change of Typically ±2.0 dB within ±75-kHz Center Frequency Change in the Complete Temperature and Supply Voltage Range  Fully Integrated PLL with Low-phase-noise VCO, PLL Loop Filter and Full Support of Multi-channel Operation with Arbitrary Channel Distance due to Fractional-N Synthesizer  Sophisticated Threshold Control and Quasi-peak Detector Circuit in the Data Slicer  315 MHz and 433.92 MHz without External VCO and PLL Components  Efficient XTO Start-up Circuit (> –1.5-kΩ Worst-case Start Impedance)  Changing of Modulation Type ASK/FSK and Data Rate without Component Changes to Allow Different Modulation Schemes in TPM and RKE  Minimal External Circuitry Requirements for Complete System Solution  Clock and Interrupt Generation for Microcontroller  ESD Protection at all Pins (±2.5 kV HBM, ±200V MM, ±500V FCDM)  Supply Voltage Range: 2.15V to 3.6V or 4.4V to 5.25V  Typical Power-down Current < 10 nA  Temperature Range: –40°C to +105°C  Small 7 mm × 7 mm QFN48 Package UHF ASK/FSK Receiver ATA5721 ATA5722 4960B–RKE–07/07

4960B–RKE–07/07 ATA5721/ATA5722 1. Pin Configuration Figure 1-1. Pinning QFN48 NC NC NC RF_IN NC 433_N868 NC NC NC NC NC NC RSSI CS TEST3 SCK SDI_TMDI SDO_TMD O CLK IRQ POUT VSINT NC XTAL2 NC NC RX_ACTIVE N_PWR_ON SCK_PHA SCK_POL NC NC PWR_ON RX_TX1 RX_TX2 CDEM NC NC NC AVCC VS2 VS1 SETPWR TEST1 DVCC CS_POL TEST2 XTAL1 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 ATA5721/ATA5722

4960B–RKE–07/07 ATA5721/ATA5722 2. Change Notice Based on Datashe et ATA5823/ATA5824 -- UHF ASK/FSK Transceiver Rev. 4829D-RKE-06/06 This change notice is based on the datasheet of the UHF transceiver ATA5823/ATA5824 and describes the changes and extensions of the receiver ATA5721/ATA5722. The receiver contains the same silicon as the transceiver, a UHF front-end die ATA5890 or ATA5891 (depending on the frequency version 433.92 MHz or 315 MHz) and the signal pro- cessing die ATA5889. Unlike the transceiver, the receiver does not have the transmit functionality, and pins 8, 9 and 10 are not connected. The only change to the receiver is that it has a different bonding inside to dis- able the TX functionality. All described specifications and parameters of the transmit functionality in the transceiver datasheet are not valid for the receiver. If the device is programmed to operate in receive mode, there will be no difference between the transceiver and receiver. The user has the ability to pro- gram the dedicated registers for transmit mode and switch the receiver into transmit mode; if this is done, the receiver will not work. In addition to the removed transmitter functionality, the receiver ATA5721/ATA5722 is also not specified or released for the use in the 867-MHz to 870-MHz frequency band. All described specifications and parameters of the 868.3 MHz receive functionality in the transceiver datasheet are also not valid for the receiver. The receive functionality will be fully tested according to the Electrical Characteristics of the transceiver to guarantee the same perfo rmance of the 315-MHz version ATA5721 and 433.92-MHz version ATA5722. Below, all changes and extensions of the receiver functionality are described in detail with cross references to the transceiver datasheet. The feature list is completely adapted for the receiver.

4960B–RKE–07/07 ATA5721/ATA5722 3. Changes and Extensions of the Recei ver ATA5721/ATA5722 Compared to the Transceiver Datasheet ATA5823/ATA5824  IC changed from transceiver to receiver due to removed TX functionality  Device type numbers changed from ATA5823 to ATA5721 (313-MHz to 316-MHz version) and from ATA5824 into ATA5722 (433-MHz to 435-MHz version)  No TX operation mode available due to removed bondwires of pins 8, 9 and 10  Pins 8, 9 and 10 are NC (not connected) and have to be soldered to GND on the PCB  No full-duplex operation mode possible  All descriptions of TX operation in half-duplex mode are not valid  The receiver type ATA5722 is only specified and tested in the frequency range of 433 MHz to

435 MHz, receive functionality in the 867-MHz to 870-MHz frequency band is neither

specified nor tested.  All descriptions of 867-MHz to 870-MHz applications are not valid. Table 3-1. Changes and Extensions of the Receiver ATA5721/ATA5722 Compared to the Transceiver Datasheet ATA5823/ATA5824 Page Note Category of Change(1) Benefit is a less demanding specification for the microcontroller due to handling of power-down mode, delivering of clock, and complete handling of receive protocol and polling CH Figure 2-1 “Pinning QFN48” and Table 2-1 “Pin Description” contains 3 pins (8, 9 and 10) changed to NC (Not Connected). Pin 6 (433_N868) still selects the input frequency range, but 868 MHz is not supported CH CH 3/5 Figure 1-1 “System Block Diagram” and figure 2-2 “Block Diagram” contain an RF rReceiver section without a power amplifier part CH

5 Figure 2-2 “Block Diagram” contains the input frequency range selection with

pin 6, but 868 MHz is not supported. CH 6/7/8 Application circuits figure 3-1, 4-1 and 5-1 are not valid Application circuit figure 6-1 is still valid, except the transmit application hints and the possibility to select the input frequency range between 433 MHz and

868 MHz

18 Section 7.11 is still valid, except the descriptions of transmit operation mode CH 19 Section 7.12 is not valid NV 21 Section 7.13 is not valid NV 23 Section 7.14 is not valid NV 24 Sections 7.15 and 7.16 are not valid NV

25 All of section 8 is not valid NV

30 Table 9-1 is still valid, except the frequency calculation at 868.3 MHz CH

36 Figure 12-1 is still valid, except the transmit-related bits in control registers 7

and 8. CH 37 Section 12.2 is still valid for RX operation Table 12-2 is not valid CH NV Note: 1. Category of Change means: CH = values or definitions are changed, NV = values or defini- tions are not valid

4960B–RKE–07/07 ATA5721/ATA5722 Table 12-5 is still valid, except the TX and full-duplex modes Table 12-6 is still valid, except the TX operation Table 12-9 is not valid CH CH NV

39 Table 12-12 is still valid, except the TX and full-duplex modes CH

40 Table 12-13 is still valid, except the TX mode CH

41 Table 12-18 is still valid, except the full-duplex mode

Table 12-19 and 12-20 are still valid, except the full-duplex mode CH CH

42 Table 12-21 is not valid, except the TX and full-duplex modes

Table 12-22 and 12-24 are not valid CH NV

43 Table 12-25 is not valid NV

50 Section 13.8 is valid, except the transmit mode CH 60 Table 14-3 is still valid, except the Li m_min and Lim_max values for 868.3 MHz CH 61 Section 14.2 is not valid NV 64 Section 14.3 is not valid NV

70 Table 14-8 is still valid, except interrupts caused by TX and full-duplex

In section 17, Electrical Characteristics, all specifications, parameters, descriptions and conditions of the 868.3-MHz RX/TX application are not valid. Section 17 Electrical Characteristics No. 1.6 is not valid NV NV 77-79 Section 17 Electrical Characteristi cs No. 3.1 through 3.11 are not valid NV 79-81 Section 17 Electrical Characteristi cs No. 4.1 through 4.18 are not valid NV 83 Section 17 Electrical Characteristics No. 6.1 and 6.2 are not valid NV 83-84 Section 17 Electrical Characteristics No. 7.1 through 7.10 are valid except the Electrical Characteristics specified for 868.3 MHz CH 84-85 Section 17 Electrical Characteristics No. 8.1 and 8.2 are not valid NV 87 Section 18 Electrical Characteristics No. 10.12 and 10.13 are not valid NV 87 Section 18 Electrical Characteristics No. 11.1 through 11.4 are not valid NV 88 Section 19 Electrical Characteristics No. 12.11 and 12.12 are not valid NV 89 Section 19 Electrical Characteristics No. 13.1 through 13.4 are not valid NV 91 Section 20 Electrical Characteristics No. 16.1 is not valid NV 93 Section 20 Electrical Characteristics No. 19.1 through 19.5 are not valid NV 93 Section 21 Electrical Characteristics No. 20.12 is not valid NV Ordering information: ATA5721-PLQW | QFN48 | 7 mm × 7 mm, Pb-free ATA5722-PLQW | QFN48 | 7 mm × 7 mm, Pb-free CH Table 3-1. Changes and Extensions of the Receiver ATA5721/ATA5722 Compared to the Transceiver Datasheet ATA5823/ATA5824 (Continued) Page Note Category of Change(1) Note: 1. Category of Change means: CH = values or definitions are changed, NV = values or defini- tions are not valid

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