TRF7970AEVM【PDF 75/85 页】EVAL MODULE FOR TRF7970A

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TRF7970A

www.ti.com

SLOS743K – AUGUST 2011 – REVISED APRIL 2014

7.2

7.2.1

7.2.2

TRF7970A Reader System Using SPI With SS Mode

General Application Considerations

Figure 7-2 shows the TRF7970A application schematic optimized for both ISO15693 and ISO14443

systems using the Serial Port Interface (SPI). Short SPI lines, proper isolation of radio frequency lines,

and a proper ground area are essential to avoid interference. The recommended clock frequency on the

DATA_CLK line is 2 MHz.

Figure 7-2 shows matching to a 50- Ω port, which allows connecting to a properly matched 50- Ω antenna

circuit or RF measurement equipment (for example, a spectrum analyzer or power meter).

Schematic

Figure 7-2 shows a sample application schematic for SPI with an SS mode MCU interface.

-2 VCC

TDO/TDI

TDI

TMS

TCK

GND

RST_NMI

SMA-142-0701-801/806

VCC

R4 100R

C23

27pF

OSC_IN

GND

2

1

GND1 OUT

IN GND2

OSC_OUT

3

C24 27pF

4

GND

JTAG

057-014-2

X4-1

X4-3 -4

X4-5 -6

X4-7 -8

X4-9 -10

X4-11 4-12

X4-13 4-14

X4

X4

X4

X4

X4

X

X

X3

(+2.7VDC - 5.5VDC)

VIN

C26

0.01uF

C25

2.2uF

TP

C17

C7

27pF 100pF 220pF

GND GND

GND(PAD)

EN

C1

L3

1.5uH

C14 R1

68pF 6.8k

GND

X2

MC-921

C13

12pF

C12

12pF

GND

GND

R2 0

GND GND

C15 C16 C18

0.01uF 2.2uF 0.01uF 2.2uF

C6 10pF

R3 0 L2

330nH

C11 C10 8 C C4

680pF

GND

C9 C5

680pF

L1

150nH

1200pF

C19 C20

0.01uF 2.2uF

GND

C2

1500pF

1500pF

1200pF C3

GND

GND

1

2

3

4

5

6

7

8

VDD_A

VIN

VDD_RF

VDD_PA

TX_OUT

VSS_PA

VSS_RX

RX_IN1

TRF7970A

33

GND

I/O_7

I/O_6

I/O_5

I/O_4

I/O_3

I/O_2

I/O_1

I/0_0

GND

24

23

22

21

20

19

18

17

VCC

RST_NMI

TCK

TMS

TDI

TDO/TDI

P3.1

P3.2

P3.7

P3.0

P3.6

P4.2 P4.2

VDD_X

GND

TXD

RXD

DATA_CLK

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

TCK

TMS

P4.7/TBCLK

P4.6/TBOUTH/ACLK

P4.5/TB2

P4.4/TB1

P4.3/TB0

P4.2/TB2

P4.1/TB1

P4.0/TB0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

VCC

SYS_CLK

R6

10k

GND

MOD

IRQ

ASK/OOK

VCC

P3.0

P3.1

P3.2

R5

47k

RST_NMI

0.1uF

GND

GND

GND

C21

0.01uF

C22

2.2uF

GND

GND

Figure 7-2. Application Schematic – SPI With SS Mode MCU Interface

An MSP430F2370 (32KB Flash, 2KB RAM) is shown in Figure 7-2 . Minimum MCU requirements depend

on application requirements and coding style. If only one ISO protocol or a limited command set of a

protocol needs to be supported, MCU Flash and RAM requirements can be significantly reduced and user

should be aware that recursive inventory and anticollision commands require more RAM than single

slotted operations. For example, current reference firmware for ISO15693 (with host interface) is

approximately 8KB, using 512B RAM and for all supported protocols (also with same host interface) the

reference firmware is approximately 12KB and uses a minimum of 1KB RAM. An MCU capable of running

its GPIOs at 13.56 MHz is required for Direct Mode 0 operations.

Copyright ? 2011–2014, Texas Instruments Incorporated

Application Schematic and Layout Considerations

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