ST25R200 datasheet(4/88 Pages) STMICROELECTRONICS

4 / 88 page

Functional overview

2.1

Block diagram

The ST25R200 block diagram is shown in Figure 1.

Figure 1. Block diagram

Regulators

VDD_D

VDD_A

XTAL

OSCILLATOR

POR

Ref.

Bias

XTO

XTI

OSCILLATOR

DIGITAL

SPI

FIFO (RAM)

256 Bytes

CONTROL

LOGIC

SPI

INTERFACE

FRAMING

WAKE – UP

TIMER

LEVEL

SHIFTERS

VDD_IO

RESET

TX CODING

Correlator

OTP

16 Bytes

Protocol timers

(MRT, NRT,

GPT)

VDD_AM

VDD AGD

Regulators

VDD_DR

VDD_AM

RECEIVER

848 kHz

ADC Dual

RFI1

RFI2

IRQ

TRANSMITTER

OOK mod

ASK mod

RFO1

RFO2

VDD_DR

GND_DR

GND_A

EMD

Registers

VDD_A

VDD_D

2.1.1

Transmitter

The transmitter incorporates the drivers, which drive the external antenna through pins RFO1 and RFO2. Both

single

‑ended and differential antenna configurations are supported. The transmitter block also generates the OOK

or AM modulation of the transmitted RF signal.

The transmitter can either operate RFO1 and RFO2 independently to drive up to two antennas in single-ended

configuration or operate RFO1 and RFO2 combined to drive one antenna in differential configuration. The drivers

are designed to directly drive antenna(s) integrated on the PCB as well as antennas connected with 50 Ω cables.

ST25R200

Functional overview

DS13658 - Rev 2

page 4/88

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