Texas Instruments TRF7962A Скачать руководство пользователя страница 39 | Manualshive

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Texas Instruments TRF7962A Скачать руководство пользователя страница 39

TRF796xA

Microcontroller

Drive the MOD pin
according to the data-coding
specified by the standard

Decode the subcarrier
information according
to the standard

MOD

(pin 14)

IO_6

(pin 23)

39

SLOS757G – DECEMBER 2011 – REVISED MARCH 2020

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Detailed Description

Copyright © 2011–2020, Texas Instruments Incorporated

Figure 6-27. Entering Direct Mode 0

Step 5:

Transmit data using direct mode

The user now has direct control over the RF modulation through the MOD input.

Figure 6-28. Control of RF Modulation Using MOD

The microcontroller is responsible for generating data according to the coding specified by the particular
standard. The microcontroller must generate SOF, EOF, data, and CRC. In direct mode, the FIFO is not
used and no IRQs are generated. See the applicable ISO standard to understand bit and frame
definitions.

Step 6:

Receive data using direct mode

After the TX operation is complete, the tag responds to the request and the subcarrier data is available on
pin I/O_6. The microcontroller must decode the subcarrier signal according to the standard. This includes
decoding the SOF, data bits, CRC, and EOF. The CRC then must be checked to verify data integrity. The
receive data bytes must be buffered locally.

Step 7:

Exit direct mode 0

When an EOF is received, data transmission is over, and direct mode 0 can be terminated by sending a
Stop condition (the SS signal goes high). The TRF7962A returns to ISO Mode (normal mode).

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Содержание TRF7962A

Страница 1: ...e reader is configured by selecting the desired protocol in the control registers Direct access to all control registers allows fine tuning of various reader parameters as needed The TRF7962A device s...

Страница 2: ...rogrammable auxiliary voltage regulator delivers up to 20 mA to supply an MCU and additional external circuits within the reader system To evaluate the latest products in the TRF79xx product family TR...

Страница 3: ...Functional Block Diagram 11 6 2 Power Supplies 11 6 3 Supply Arrangements 12 6 4 Supply Regulator Settings 13 6 5 Power Modes 14 6 6 Receiver Analog Section 17 6 7 Receiver Digital Section 18 6 8 Osc...

Страница 4: ...2020 Texas Instruments Incorporated 2 Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Changes from May 18 2017 to March 11 2020 Page Remov...

Страница 5: ...industry s broadest wireless connectivity portfolio Products for NFC RFID TI provides one of the industry s most differentiated NFC and RFID product portfolios and is your solution to meet a broad ra...

Страница 6: ...ated supply 2 7 V to 5 V normally connected to VDD_PA pin 4 4 VDD_PA INP Supply for PA normally connected externally to VDD_RF pin 3 5 TX_OUT OUT RF output selectable output power 100 mW or 200 mW wit...

Страница 7: ...I O_7 BID I O pin for parallel communication MOSI for serial communication SPI 25 EN2 INP Selection of power down mode If EN2 is connected to VIN then VDD_X is active during power down mode 2 for exa...

Страница 8: ...device 5 Specifications 5 1 Absolute Maximum Ratings 1 over operating free air temperature range unless otherwise noted 2 MIN MAX UNIT Input voltage range VIN 0 3 6 V Maximum current IIN 150 mA Maximu...

Страница 9: ...ply current without antenna driver current Oscillator regulators RX and AGC are active TX is off 10 5 14 mA ION2 Supply current in TX half power Oscillator regulators RX AGC and TX active POUT 100 mW...

Страница 10: ...ck depends on the capacitive load Maximum SPI clock speed should not exceed 10 MHz This clock speed is acceptable only when external capacitive load is less than 30 pF MISO driver has a typical output...

Страница 11: ...d Description Copyright 2011 2020 Texas Instruments Incorporated 6 Detailed Description 6 1 Functional Block Diagram Figure 6 1 shows the functional block diagram Figure 6 1 Functional Block Diagram 6...

Страница 12: ...e used per reference schematics When configured for 3 V manual operation the VDD_A output can be set from 2 7 V to 3 4 V in 100 mV steps see Table 6 2 NOTE The configuration of VDD_A and VDD_X regulat...

Страница 13: ...is VSS pin 10 the analog negative supply is VSS_A pin 15 the logic negative supply is VSS_D pin 29 the RF output stage negative supply is VSS_PA pin 6 and the negative supply for the RF receiver VSS_...

Страница 14: ...x 0 0 0 VDD_RF 2 7 V VDD_A 2 7 V VDD_X 2 7 V The regulator configuration function adjusts the regulator outputs by default to 250 mV below VIN level but not higher than 5 V for VDD_RF 3 4 V for VDD_A...

Страница 15: ...E Mode 4 full power 5 VDC x 1 21 07 On On On x On 130 23 20 to 25 s Mode 4 full power 3 3 VDC x 1 20 07 On On On x On 67 18 Mode 3 half power 5 VDC x 1 31 07 On On On x On 70 20 20 to 25 s Mode 3 half...

Страница 16: ...ce the reader stays active If the EN input is not set high EN 0 within 100 s after the SYS_CLK output is switched from auxiliary clock 60 kHz to high frequency clock derived from the crystal oscillato...

Страница 17: ...eceiver has an RF envelope detection stage first gain and filtering with AGC stage and finally the auxiliary RSSI block The default MUX setting is RX_IN1 connected to the main receiver and RX_IN2 conn...

Страница 18: ...removed The parity bits and CRC bytes are also checked and removed The end result is clean or raw data that is then sent to the 12 byte FIFO register where it can be read by the external microcontrol...

Страница 19: ...ngth Indicator RSSI The TRF7962A incorporates three independent RSSI building blocks Internal Main RSSI Internal Auxiliary RSSI and External RSSI The internal RSSI blocks are measuring the amplitude o...

Страница 20: ...the communication to the Tag this means the TX must be on Bit 1 in the Chip Status Control register 0x00 defines if internal RSSI or the external RSSI value is stored in the RSSI Levels and Oscillator...

Страница 21: ...ntrolled by the Chip Status Control register 0x00 and the EN and EN2 signals The oscillator generates the RF frequency for the RF output stage and the clock source for the digital section The buffered...

Страница 22: ...the modulation type ASK or OOK at pin 12 External control of the modulation type is made possible only if enabled by setting B6 in the Modulator and SYS_CLK Control register 0x09 to 1 In normal opera...

Страница 23: ...d Second to configure the TRF7962A receiver inputs for an external demodulated subcarrier input The design of an external power amplifier requires detailed RF knowledge There are also readily designed...

Страница 24: ...ontrol bit 0 Address 1 Command 0 1 B6 Read Write 1 Read 0 Write R W 0 B5 Continuous address mode 1 Continuous mode R W 0 B4 Address command bit 4 Adr 4 Cmd 4 B3 Address command bit 3 Adr 3 Cmd 3 B2 Ad...

Страница 25: ...ts the format of a continuous address register read and Figure 6 5 and Figure 6 6 show examples Table 6 8 Continuous Address Mode Start Adr x Data x Data x 1 Data x 2 Data x 3 Data x 4 Data x n StopCo...

Страница 26: ...ed Table 6 9 lists the format of a single address register read and Figure 6 7 and Figure 6 8 show examples Table 6 9 Noncontinuous Address Mode Single Address Mode Start Adr x Data x Adr y Data y Adr...

Страница 27: ...t keeps track of the number of bytes loaded into the FIFO If the number of bytes in the FIFO is n the register value is n 1 number of bytes in FIFO register If 8 bytes are in the FIFO the FIFO counter...

Страница 28: ...data or remove the data as necessary The MCU also checks the number of data bytes to be sent so as to not surpass the value defined in TX length bytes The MCU also signals the transmit logic when the...

Страница 29: ...the MCU at the end of the receive operation if the receive data string was shorter than or equal to 8 bytes The MCU receives the interrupt request then checks to determine the reason for the interrup...

Страница 30: ...ion If the number of bytes to be transmitted is higher or equal to 5 then the interrupt is generated This occurs also when the number of bytes in the FIFO reaches 3 The MCU should check the IRQ Status...

Страница 31: ...tion is when SCLK is high 2 Send address word to IRQ Status register 0x0C with read and continuous address mode bits set to 1 3 Read 1 byte 8 bits from IRQ Status register 0x0C 4 Dummy read 1 byte fro...

Страница 32: ...ising edge see Figure 6 17 Communication is terminated when the Slave Select signal goes high All words must be 8 bits long with the MSB transmitted first Figure 6 17 SPI With Slave Select Timing The...

Страница 33: ...tation Feedback Product Folder Links TRF7962A Detailed Description Copyright 2011 2020 Texas Instruments Incorporated Figure 6 18 Continuous Read Operation Using SPI With Slave Select Figure 6 19 Cont...

Страница 34: ...een transmitted an interrupt occurs from the reader to indicate back to the MCU that the transmission has been completed In the example shown in Figure 6 21 this IRQ occurs approximately 1 6 ms after...

Страница 35: ...nded followed by a single read of the FIFO Status register which indicates that there are at least 9 bytes to be read out Figure 6 22 IRQ Status Register Read Followed by FIFO Status Register Read Thi...

Страница 36: ...UID which must be retrieved see Figure 6 24 IRQ register read shows RX is complete and FIFO register status shows one byte available as expected and it is the E0 indicating ISO IEC 15693 transponder...

Страница 37: ...ver the RF modulation through the MOD input This mode is provided so that the application can implement a protocol that has the same bit coding as one of the protocols implemented in the reader but ne...

Страница 38: ...lation 0x20 for 6 78 MHz clock and ASK 10 modulation 0x24 for 6 78 MHz clock and ASK 13 modulation 0x25 for 6 78 MHz clock and ASK 16 modulation See register 0x09 definition for all other possible val...

Страница 39: ...to the coding specified by the particular standard The microcontroller must generate SOF EOF data and CRC In direct mode the FIFO is not used and no IRQs are generated See the applicable ISO standard...

Страница 40: ...t Distribution BIT DESCRIPTION BIT FUNCTION ADDRESS COMMAND B7 Command control bit 0 Address 1 Command 0 1 B6 Read Write 0 Write 1 Read R W 0 B5 Continuous address mode Continuous mode Not used B4 Add...

Страница 41: ...rs in reset mode The reset mode can be terminated in two ways The external system can send the enable receiver command see Section 6 13 7 The reset mode is automatically terminated at the end of a tra...

Страница 42: ...nds require full operation so the receiver must be activated by enable RX or by a normal tag communication for the Check RF command to work properly Table 6 14 Test External RF RF_IN1 mVP 40 60 80 100...

Страница 43: ...s 0x06 TX Pulse Length Control R W Section 6 14 1 2 1 0x07 RX No Response Wait R W Section 6 14 1 2 2 0x08 RX Wait Time R W Section 6 14 1 2 3 0x09 Modulator and SYS_CLK Control R W Section 6 14 1 2 4...

Страница 44: ...ovides user direct access to AFE direct mode 0 or lets the user add custom framing direct mode 1 Bit 6 of the ISO Control register must be set before entering direct mode 0 or 1 0 ISO mode default Use...

Страница 45: ...B5 rfid RFID mode 0 RFID mode 1 Reserved should be set to 0 B4 iso_4 RFID See Table 6 18 for B0 B4 settings based on the ISO protocol that the application requires B3 iso_3 RFID B2 iso_2 RFID B1 iso_...

Страница 46: ...lt timings are preset by the ISO Control register 0x01 9 44 s for ISO IEC 15693 TI Tag It HF I B6 Pul_p1 B5 Pul_p0 B4 Pul_c4 B3 Pul_c3 B2 Pul_c2 B1 Pul_c1 B0 Pul_c0 6 14 1 2 2 RX No Response Wait Time...

Страница 47: ...fter the end of the transmit operation in which the receive decoders are not active held in reset state This prevents incorrect detections resulting from transients following the transmit operation Th...

Страница 48: ...of OOK or ASK using the OOK pin is only possible if the function is enabled by setting B6 1 en_ook_p in this register 0x09 and the ISO Control register 0x01 B6 1 When configured this way the MOD pin p...

Страница 49: ...Control register 0x01 Table 6 23 RX Special Setting Register 0x0A BIT NO BIT NAME FUNCTION DESCRIPTION B7 C212 Band pass 110 kHz to 570 kHz B6 C424 Band pass 200 kHz to 900 kHz Appropriate for 424 kH...

Страница 50: ...K pin becomes modulation output for external TX amplifier B5 io_low 1 Enable low peripheral communication voltage When B5 1 maintains the output driving capabilities of the I O pins connected to the l...

Страница 51: ...9 V VDD_A 2 9 V VDD_X 2 9 V 0B 0 0 0 1 VDD_RF 2 8 V VDD_A 2 8 V VDD_X 2 8 V 0B 0 0 0 0 VDD_RF 2 7 V VDD_A 2 7 V VDD_X 2 7 V 1 x don t care Table 6 27 Supply Regulator Setting Automatic 5 V System REG...

Страница 52: ...6 29 IRQ Status Register 0x0C BIT NO BIT NAME FUNCTION DESCRIPTION B7 Irq_tx IRQ set due to end of TX Signals that TX is in progress The flag is set at the start of TX but the interrupt request IRQ 1...

Страница 53: ..._irq_fifo Interrupt enable for FIFO Default 1 B4 En_irq_err1 Interrupt enable for CRC Default 1 B3 En_irq_err2 Interrupt enable for Parity Default 1 B2 En_irq_err3 Interrupt enable for Framing error o...

Страница 54: ...e reader so the new tag response level can be measured Section 6 7 1 1 and Section 6 7 1 2 describe the RSSI levels calculated to RF_IN1 and RF_IN2 The RSSI has 7 steps 3 bits with 4 dB increment The...

Страница 55: ...e output selection 0 First stage output used for analog out and digitizing 1 Second stage output used for analog out and digitizing B3 low2 Second stage gain 6 dB HP corner frequency 2 B2 low1 First s...

Страница 56: ...B3 Fb3 FIFO bytes fb 3 Bits B0 B3 indicate how many bytes that are loaded in FIFO were not read out yet displays N 1 number of bytes If 8 bytes are in the FIFO this number is 7 also see register 0x0C...

Страница 57: ...and EN 0 The register is also automatically reset at TX EOF Table 6 37 TX Length Byte2 Register 0x1E BIT NO BIT NAME FUNCTION DESCRIPTION B7 Txl3 Number of complete byte bn 3 Low nibble of complete i...

Страница 58: ...erference The recommended clock frequency on the DATA_CLK line is 2 MHz This schematic shows matching to a 50 port which allows connection to a properly matched 50 antenna circuit or RF measurement eq...

Страница 59: ...his Avoid crossing of digital lines under RF signal lines Also avoid crossing of digital lines with other digital lines whenever possible If the crossings are unavoidable 90 crossings should be used t...

Страница 60: ...Impedance Matching Smith Chart Resulting power out can be measured with a power meter spectrum analyzer with power meter function or other equipment capable of making a hot measurement Take care to o...

Страница 61: ...ully qualified production devices with no prefix Device development evolutionary flow xTRF Experimental device that is not necessarily representative of the electrical specifications of the final devi...

Страница 62: ...n which controlling the entire system current draw over time is of the utmost concern TRF7960A RFID Multiplexer Example System This application report describes the 16 channel high frequency HF 13 56...

Страница 63: ...metric changes could cause the device not to meet its published specifications 8 8 Export Control Notice Recipient agrees to not knowingly export or re export directly or indirectly any product or tec...

Страница 64: ...Texas Instruments Incorporated 9 Mechanical Packaging and Orderable Information The following pages include mechanical packaging and orderable information This information is the most current data av...

Страница 65: ...rements of 1000ppm threshold Antimony trioxide based flame retardants must also meet the 1000ppm threshold requirement 3 MSL Peak Temp The Moisture Sensitivity Level rating according to the JEDEC indu...

Страница 66: ...PACKAGE OPTION ADDENDUM www ti com 20 Feb 2020 Addendum Page 2...

Страница 67: ...Pins SPQ Reel Diameter mm Reel Width W1 mm A0 mm B0 mm K0 mm P1 mm W mm Pin1 Quadrant TRF7962ARHBR VQFN RHB 32 3000 330 0 12 4 5 3 5 3 1 5 8 0 12 0 Q2 TRF7962ARHBT VQFN RHB 32 250 180 0 12 4 5 3 5 3 1...

Страница 68: ...Package Type Package Drawing Pins SPQ Length mm Width mm Height mm TRF7962ARHBR VQFN RHB 32 3000 853 0 449 0 35 0 TRF7962ARHBT VQFN RHB 32 250 210 0 185 0 35 0 PACKAGE MATERIALS INFORMATION www ti com...

Страница 69: ...IEW Images above are just a representation of the package family actual package may vary Refer to the product data sheet for package details VQFN 1 mm max height RHB 32 PLASTIC QUAD FLATPACK NO LEAD 5...

Страница 70: ...2 25 OPTIONAL PIN 1 ID 0 1 C A B 0 05 C EXPOSED THERMAL PAD 33 SYMM SYMM NOTES 1 All linear dimensions are in millimeters Any dimensions in parenthesis are for reference only Dimensioning and toleranc...

Страница 71: ...age is designed to be soldered to a thermal pad on the board For more information see Texas Instruments literature number SLUA271 www ti com lit slua271 5 Vias are optional depending on application re...

Страница 72: ...4223442 B 08 2019 NOTES continued 6 Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release IPC 7525 may have alternate design recommendations 33 SYMM METAL...

Страница 73: ...e resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reprod...

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