SLOS743M
August 2011 – March 2020
TRF7970A
PRODUCTION DATA.
1
Device Overview
1.1
Features
1.2
Applications
1.3
Description
1.4
Functional Block Diagram
2
Revision History
3
Device Characteristics
3.1
Related Products
4
Terminal Configuration and Functions
4.1
Pin Diagram
4.2
Signal Descriptions
Table 4-1
Terminal Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Electrical Characteristics
5.5
Thermal Resistance Characteristics
5.6
Switching Characteristics
6
Detailed Description
6.1
Overview
6.1.1
RFID and NFC Operation – Reader and Writer
6.1.2
NFC Device Operation – Initiator
6.1.3
NFC Device Operation – Target
6.1.3.1
Active Target
6.1.3.2
Passive Target
6.1.3.3
Card Emulation
6.2
System Block Diagram
6.3
Power Supplies
6.3.1
Supply Arrangements
6.3.2
Supply Regulator Settings
6.3.3
Power Modes
6.4
Receiver – Analog Section
6.4.1
Main and Auxiliary Receivers
6.4.2
Receiver Gain and Filter Stages
6.5
Receiver – Digital Section
6.5.1
Received Signal Strength Indicator (RSSI)
6.5.1.1
Internal RSSI – Main and Auxiliary Receivers
6.5.1.2
External RSSI
6.6
Oscillator Section
6.7
Transmitter – Analog Section
6.8
Transmitter – Digital Section
6.9
Transmitter – External Power Amplifier and Subcarrier Detector
6.10
TRF7970A IC Communication Interface
6.10.1
General Introduction
6.10.1.1
Continuous Address Mode
6.10.1.2
Noncontinuous Address Mode (Single Address Mode)
6.10.1.3
Direct Command Mode
6.10.1.4
FIFO Operation
6.10.2
Parallel Interface Mode
6.10.3
Reception of Air Interface Data
6.10.4
Data Transmission From MCU to TRF7970A
6.10.5
Serial Interface Communication (SPI)
6.10.5.1
Serial Interface Mode With Slave Select (SS)
6.10.6
Direct Mode
6.11
TRF7970A Initialization
6.12
Special Direct Mode for Improved MIFARE Compatibility
6.13
NFC Modes
6.13.1
Target
6.13.2
Initiator
6.14
Direct Commands from MCU to Reader
6.14.1
Command Codes
6.14.1.1
Idle (0x00)
6.14.1.2
Software Initialization (0x03)
6.14.1.3
Initial RF Collision Avoidance (0x04)
6.14.1.4
Response RF Collision Avoidance (0x05)
6.14.1.5
Response RF Collision Avoidance (0x06, n = 0)
6.14.1.6
Reset FIFO (0x0F)
6.14.1.7
Transmission With CRC (0x11)
6.14.1.8
Transmission Without CRC (0x10)
6.14.1.9
Delayed Transmission With CRC (0x13)
6.14.1.10
Delayed Transmission Without CRC (0x12)
6.14.1.11
Transmit Next Time Slot (0x14)
6.14.1.12
Block Receiver (0x16)
6.14.1.13
Enable Receiver (0x17)
6.14.1.14
Test Internal RF (RSSI at RX Input With TX ON) (0x18)
6.14.1.15
Test External RF (RSSI at RX Input with TX OFF) (0x19)
6.15
Register Description
6.15.1
Register Preset
6.15.2
Register Overview
6.15.3
Detailed Register Description
6.15.3.1
Main Configuration Registers
6.15.3.1.1
Chip Status Control Register (0x00)
6.15.3.1.2
ISO Control Register (0x01)
6.15.3.2
Control Registers – Sublevel Configuration Registers
6.15.3.2.1
ISO/IEC 14443 TX Options Register (0x02)
6.15.3.2.2
ISO/IEC 14443 High-Bit-Rate and Parity Options Register (0x03)
6.15.3.2.3
TX Timer High Byte Control Register (0x04)
6.15.3.2.4
TX Timer Low Byte Control Register (0x05)
6.15.3.2.5
TX Pulse Length Control Register (0x06)
6.15.3.2.6
RX No Response Wait Time Register (0x07)
6.15.3.2.7
RX Wait Time Register (0x08)
6.15.3.2.8
Modulator and SYS_CLK Control Register (0x09)
6.15.3.2.9
RX Special Setting Register (0x0A)
6.15.3.2.10
Regulator and I/O Control Register (0x0B)
6.15.3.3
Status Registers
6.15.3.3.1
IRQ Status Register (0x0C)
6.15.3.3.2
Interrupt Mask Register (0x0D) and Collision Position Register (0x0E)
6.15.3.3.3
RSSI Levels and Oscillator Status Register (0x0F)
6.15.3.3.4
Special Functions Register (0x10)
6.15.3.3.5
Special Functions Register (0x11)
6.15.3.3.6
Adjustable FIFO IRQ Levels Register (0x14)
6.15.3.3.7
NFC Low Field Level Register (0x16)
6.15.3.3.8
NFCID1 Number Register (0x17)
6.15.3.3.9
NFC Target Detection Level Register (0x18)
6.15.3.3.10
NFC Target Protocol Register (0x19)
6.15.3.4
Test Registers
6.15.3.4.1
Test Register (0x1A)
6.15.3.4.2
Test Register (0x1B)
6.15.3.5
FIFO Control Registers
6.15.3.5.1
FIFO Status Register (0x1C)
6.15.3.5.2
TX Length Byte1 Register (0x1D), TX Length Byte2 Register (0x1E)
7
Applications, Implementation, and Layout
7.1
TRF7970A Reader System Using SPI With SS Mode
7.1.1
General Application Considerations
7.1.2
Schematic
7.2
Layout Considerations
7.3
Impedance Matching TX_Out (Pin 5) to 50 Ω
7.4
Reader Antenna Design Guidelines
8
Device and Documentation Support
8.1
Getting Started and Next Steps
8.2
Device Nomenclature
8.3
Tools and Software
8.4
Documentation Support
8.5
Support Resources
8.6
Trademarks
8.7
Electrostatic Discharge Caution
8.8
Glossary
9
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RHB|32
MPQF130D
Thermal pad, mechanical data (Package|Pins)
RHB|32
QFND029X
Orderable Information
slos743m_oa
slos743m_pm
6.1
Overview