User's Manual
Table Of Contents
- 1 Introduction
- Table of Contents
- 2 Description (continued)
- 3 Physical Characteristics
- 4 ELECTRICAL SPECIFICATIONS
- 5 System Description
- 5.1 Power Supplies
- 5.2 Receiver – Analog Section
- 5.3 Register Descriptions
- 5.4 Direct Commands From MCU to Reader
- 5.4.1 Command Codes
- 5.4.2 Reset
- 5.4.3 Transmission With CRC
- 5.4.4 Transmission Without CRC
- 5.4.5 Delayed Transmission With CRC
- 5.4.6 Delayed Transmission Without CRC
- 5.4.7 Transmission Next Slot
- 5.4.8 Receiver Gain Adjust
- 5.4.9 Test External RF (RSSI at RX input with TX OFF)
- 5.4.10 Test Internal RF (RSSI at RX input with TX ON)
- 5.4.11 Block Receiver
- 5.4.12 Enable Receiver
- 5.5 Reader Communication Interface
- 5.6 Parallel Interface Communication
- 5.7 Serial Interface Communication
- 5.8 External Power Amplifier Application
TRF7960
TRF7961
www.ti.com
SLOU186F–AUGUST 2006–REVISED AUGUST 2010
Table 5-18. RX Wait Time (08h)
Defines the time after TX EOF when the RX input is disregarded
Register default is set to 0x1F at POR = H or EN = L and at each write to ISO control register.
Bit Bit Name Function Comments
B7 Rxw7 RX wait Defines the time during which the RX input is ignored.
It starts from the end of TX EOF.
B6 Rxw6
RX wait range is 9.44 μs to 2407 μs (1...255),
B5 Rxw5
Step size 9.44 μs
Preset: 293 μs ISO15693
B4 Rxw4
Preset: 66 μs ISO14443A and B
B3 Rxw3
Preset: 180 μs Tag-It
B2 Rxw2
B1 Rxw1
Table 5-19. Modulator and SYS_CLK Control (09h)
Controls the modulation depth, modulation input and ASK / OOK control
Register default is set to 0x11 at POR = H or EN = L, and at each write to ISO control register, except Clo1 and Clo0.
Bit Bit Name Function Comments
B7 Unused
B6 en_ook_p 1 = enables external selection of ASK or OOK Valid only when ISO control register (01) is configured to direct mode
modulation
B5 Clo1 SYS_CLK output frequency MSB Clo1 Clo0 CL_SYS Output state
B4 Clo0 SYS_CLK output frequency LSB 0 0 disabled
0 1 3.3 MHz
1 0 6.78 MHz
1 1 13.56 MHz
B3 en_ana 1 = Enables analog output on ASK/OOK pin For test and measurement
(pin12)
B2 Pm2 Modulation depth MSB Pm2 Pm1 Pm0 Mod Type and %
0 0 0 ASK 10%
B1 Pm1 Modulation depth
0 0 1 OOK (100%)
B0 Pm0 Modulation depth LSB
0 1 0 ASK 7%
0 1 1 ASK 8.5%
1 0 0 ASK 13%
1 0 1 ASK 16%
1 1 0 ASK 22%
1 1 1 ASK 30%
Copyright © 2006–2010, Texas Instruments Incorporated System Description 29
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