CS8130 datasheet(8/28 Pages) CIRRUS

Nome de Peças	CS8130

Descrição Electrónicos	Multi-Standard Infrared Transceiver

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Fabricante Electrônico	CIRRUS [Cirrus Logic]

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then the RXD pin will oscillate at the carrier fre-

quency.

Transmit Path

Data for transmission is input to the CS8130 on

the TXD pin. The selected modulation scheme is

then applied to the data, and the resulting signals

are used to drive the LED. There are 2 LED out-

put pins: LED1C and LED2C. They are open

drain outputs, which pull down to TGND or

float. The LED is connected via resistors to both

LED1C and LED2C. The current level flowing

through the LED is determined by the external

resistors. Normally, LED1C is used to drive the

LED. If additional current is needed, (for exam-

ple for TV remote operation), then the second

driver may be enabled. The amount of ’boost’

current is determined by the external resistor

connected to the LED2C pin.

For larger amounts of IR output, it may be pref-

erable to use two LEDs, rather than drive a large

current through one LED. For a +3V supply sys-

tem using two LEDs, each one is connected, via

a resistor, to each driver output. For a +5V sup-

ply system, 2 LEDS may be connected in series,

and then routed to each driver via 2 resistors,

one for each driver. This minimizes the power

dissipation in the resistors.

Mode 1 Transmit Choices

In Mode 1 (IrDA), the pulse width may be fixed

at 1.6

µs, or set to 3/16 of the bit period. Either

of these settings will meet the IrDA standard, but

fixed 1.6

µs pulses will save power at lower

baud rates.

In addition, there is a choice which affects the

output pulse jitter. The default state causes the

CS8130 to look for the start bit on TXD. All

subsequent LED transitions for that character are

timed relative to the internal baud rate clock.

Therefore there will be no jitter in the LED out-

put pulse timing. However, the CS8130 now has

to be programmed with the desired number of

bits per character, which for IrDA compliance, is

8.

Alternatively, the CS8130 can generate output

pulses based entirely on individual transitions on

TXD, with no knowledge of which bit is the

start bit. Thus a 1 to 0 transition will generate a

pulse based on that transition edge. If TXD is

low for multiple successive bits, then the

CS8130 will generate pulses based on its internal

clock. Therefore there is the possibility of jitter

in the output pulses of N*271 ns. N can be 0, 1

2....., depending on the difference in frequency

between the UART baud rate clock and the

CS8130 clock. Clearly, if the CS8130 and its as-

sociated UART are running from the same clock,

the possibility of jitter is eliminated.

Mode 2 (ASK) Transmit Choices

The modulation frequency is determined by the

modulator divider registers. For nominal

500 kHz, use a divide value of 6, which yields a

modulation frequency of 527 kHz.

Mode 3 (TV Remote) Transmit Choices

During transmission of IR, the start and stop bits

present in the incoming data from the UART are

stripped off (see Figure 5). The remaining data

bits are then sent out at ~2400 bps. Since there

should be no gaps in the transmitted data, the

input data is buffered in a 22-character location

FIFO. Characters can be received on the TXD

pin while the previous characters are being trans-

mitted. To prevent overflow, a hardware

handshake mechanism is provided. If the FIFO

is one character away from being full, the

FORM/BSY pin is brought high, indicating that

the UART should not send any more data. Once

a no t he r character has been t ransm it ted,

FORM/BSY pin is brought low, indicating to the

UART that it is OK to send another character.

CS8130

8

DS134PP2

CS8130

8

DS134F1

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