CS8130-CS datasheet(6/28 Pages) CIRRUS

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OVERVIEW

The CS8130 is an infrared transceiver I.C. The

receive channel includes on-chip high gain PIN

diode amplifier, IrDA, HP-SIR, 500 kHz Ampli-

tu de Shift Keyin g (A SK) & TV remote

compatible decoder, and data pulse stretcher. The

transmit path includes IrDA, HPSIR, 500 kHz

ASK & TV remote compatible encoder, and

LED drivers. The computer data port is standard

UART TxD and RxD compatible, and operates

from 1200 to 115200 baud. An on-chip baud rate

generator is provided.

External PIN diode and transmit LED(s) are re-

quired. A control mode is provided to allow easy

UART programming of different modes.

The CS8130 operates from power supplies of

+2.7 V to +5.5 V. The device is supplied in a 20-

pin SSOP package

FUNCTIONAL DESCRIPTION

The following pages describe the detailed opera-

tion of the CS8130.

IR Data Formats

The CS8130 supports three infrared data trans-

mission formats: IrDA/HPSIR, 500kHz ASK and

38kHz ASK (TV Remote). There is also a direct

access mode, which bypasses the CS8130 en-

coder and decoders, and gives direct access to

the IR raw data. This mode is for situations

where the encoding and/or decoding is done ex-

ternally.

Modes may be set independently for transmit

and receive, although this would be unusual.

Mode 1 IrDA/HP-SIR

The CS8130 is designed to allow easy realiza-

tion of an IrDA compatible IR port (see IrDA

Serial Infrared (SIR) Physical Layer Link Speci-

fication, Version 1.0, April 27 1994). Figure 2

shows the format of Mode 1. A pulse of IR en-

ergy indicates a logic ’0’. No IR indicates a

logic ’1’. The pulse can be from 3/16 of a bit

cell time at 115200 (~1.6

µs), to 3/16 of a bit

cell time at 2400 bps (~78

µs). The width of the

pulse may be fixed at 1.6

µs for all baud rates, or

may scale with the baud rate. The initial baud

rate for IrDA is 9600 bps, with a negotiated baud

rate possibility of 2400 to 115200 bps.

Mode 2 500 kHz ASK

Figure 3 shows the infrared data format for

Mode 2. This is a Carrier Wave (CW) type sys-

tem, where the presence of a 500kHz carrier is

treated as a ’0’, and absence of a carrier is

treated as a ’1’. Normally used baud rates are

9600 bps, 19.2 kbps and 38.4 kbps.

Mode 3 38 kHz ASK (TV remote mode)

Figure 4 shows the infrared data format for

Mode 3, the TV remote control mode. This is

similar to Mode 2, except that the modulation

frequency is ~38kHz. The IR bit rate is approxi-

mately 2400 bps. Both modulation frequency

and bit rate vary significantly for different manu-

facturer and model remote controls.

Mode 4 Direct Access Mode

In Mode 4, the IR transmission tracks directly

what is present on the TXD pin. A logic ’1’

means that the LED is off, a logic ’0’ means that

the LED is on. Care must be taken to ensure that

the LED is not ’on’ continuously, otherwise the

LED may be damaged.

In Mode 4, received IR is compared against the

programmed threshold. The resulting logic out-

put is routed directly to the RXD pin. A logic ’1’

means no IR is detected, a logic ’0’ means IR is

being detected. If a IR carrier is being received,

CS8130

DS134PP2

CS8130

DS134F1

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