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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
7 Application Schematic and Layout Considerations
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7.1
7.1.1
7.1.2
TRF7970A Reader System Using Parallel Microcontroller Interface
General Application Considerations
Figure 7-1 shows the most flexible TRF7970A application schematic. Both ISO15693, ISO14443 and
FeliCa systems can be addressed. Due to the low clock frequency on the DATA_CLK line, the parallel
interface is the most robust way to connect the TRF7970A with the MCU.
Figure 7-1 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 7-1 shows a sample application schematic for a parallel 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
GND GND
GND(PAD)
VCC 39
24 TDO/TDI 33
I/O_6
I/O_5
I/O_4
I/O_3
I/O_2
I/O_1
I/0_0
EN
C1
L3
1.5uH
C14 R1
68pF 6.8k
GND
X2
MC-921
C13
12pF
C12
12pF
GND
GND
R2 0
C15 C16 C18
0.01uF 2.2uF 0.01uF 2.2uF
GND GND
C6 10pF
R3 0 L2
330nH
C11 C10 8 C C7 C4
27pF 100pF 220pF 680pF
GND
C9 C5
680pF
C19
0.01uF
GND
L1
150nH
1200pF
1200pF
C20
2.2uF
C2
1500pF
1500pF
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
GND
RST_NMI 37
TCK 36
TMS 35
TDI 34
I/O_7
TXD 22
RXD 21
DATA_CLK
40
38
23 32
22 31
21 30
20 29
19 28
18 27
17 26
25
24
23
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
GND
R5
47k
RST_NMI
0.1uF
GND
GND
GND
C21
0.01uF
C22
2.2uF
GND
GND
Figure 7-1. Application Schematic – Parallel MCU Interface
An MSP430F2370 (32KB Flash, 2KB RAM) is shown in Figure 7-1 . 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. 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; 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.
74
Application Schematic and Layout Considerations
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