TMPR3911 datasheet(231/462 Pages) TOSHIBA

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Chapter 10 IR Module

10-1

10. IR Module

10.1 Overview

The IR Module consists of three parts. The first is the Consumer Interface, which provides an easy

mechanism for generating pulses to either turn on or turn off a light emitting diode (LED). The pattern in

which the diode is turned on and off is used to encode commands which emulate remote control key presses

that the consumer device recognizes. The software is responsible for programming the IR Module parameters

to emulate desired consumer remote control protocols and key presses. The Consumer Interface provides

universal control of common consumer devices such as televisions, VCR’s, hi-fi equipment, appliances, etc.

The second part of the IR Module is the Communication Interface. The IR Module can be used in one of

two data communication modes: using a frequency shift keyed (FSK) modulation scheme or using a scheme

based on the protocol standardized by the InfraRed Data Association (IrDA).

The Communication Interface is implemented using a standard UART protocol with an adjustable baud

rate. This interface operates half-duplex in one direction at a time. The UARTB Module is used for both the

FSK and IrDA data communication modes (see Section 16 for a detailed description of the UART Module).

For the FSK mode transmit direction, external communication IR analog circuitry encodes the UART

output data using an FSK modulation scheme. For the receive direction, external communication IR analog

circuitry amplifies the received photo-diode signal and demodulates the FSK signal before feeding the

UART input.

For the IrDA mode transmit direction, the UART output data directly drives the external analog LED

circuit. For the receive direction, the received photo-diode signal is externally amplified before feeding the

UART input. Additional control bits in the UART Module also allow for various narrow pulse options to

support the IrDA 1.0 standard.

The final part of the IR Module is the Carrier Detect State Machine Interface. This interface is used to

periodically enable the receiver in the external communication IR analog circuitry to detect whether there is

a valid carrier present. If a valid carrier is present then an interrupt will be issued so the system can begin

receiving data.

10.1.1

Related Pins

IROUT:

OUTPUT

This pin is the UART transmit signal from the UARTB Module or the Consumer IR output

signal if Consumer IR mode is enabled.

IRIN:

INPUT

This pin is the UART receive signal to the UARTB Module.

RXPWR:

OUTPUT

This pin is the receiver power output control signal to the external communication IR analog

circuitry.

CARDET:

INPUT

This pin is the carrier detect input signal from the external communication IR analog circuitry.

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