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UCC5340 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UCC5340
기능 IrDA Receiver
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UCC5340 데이터시트, 핀배열, 회로
IrDA Receiver
FEATURES
Micro Power, 90 A Typical
Operating Current
3.3V or 5V Operation
8-Pin SOIC Package
1 cm to 1 Meter IrDA Link
Compliance
Directly Interfaces to IrDA
Compatible UARTS and Super I/O
Chips
Supports Data Rates from 2400 to
115.2KBits/Second
CMOS/TTL Compatible Output
ASK Modulation Compatible
Drop in compatible with Irvine
Sensor SIR2
BLOCK DIAGRAM
UCC5340
PRELIMINARY
DESCRIPTION
The UCC5340 is a dual voltage, micropower, IrDA (Infrared Data Associa-
tion) compliant receiver. It’s high gain photodiode input amplifier incorpo-
rates a unique limiting circuit which permits operation over a very wide
dynamic input range. The integrated bandpass filter includes additional
limiting circuitry, further reducing device recovery time requirements, al-
lowing the UCC5340 to directly interface with IrDA compatible detector di-
odes.
The output is capable of driving a 40pF load at CMOS/TTL levels for direct
interfacing to IrDA compliant UARTs or Super I/O devices over a 2400BPS
to 115.2kBPS range.
A control pin is provided to allow operation with either 3.3V or 5V supplies.
The circuit requires only 90 A (nominal) operating current in either config-
uration. An internal 2k resistor is provided for decoupling the detector
supply, to minimize the number of external components required.
* Pins 3 and 6 MUST be connected to ground.
11/95
UDG-95126




UCC5340 pdf, 반도체, 판매, 대치품
UCC5340
APPLICATIONS INFORMATION (cont.)
The IrDA stream is a 1.6 microsecond or 3/16 th of a bit
time pulse for each zero or start bit. The IrDA receiver
must pick up the start bit to frame the character.
The start bit must be passed to the UART to start the
framing. This is critical to get the Start bit, the IR receiver
can not be in saturation from the last information
transfered from the system. This requires a fast receiver
AGC system, amplifiers, and filters that are not in satura-
tion.
The receiver has to work over a very wide ambient IR
level, from sunlit rooms to dark rooms. There is a wide
range of background noise and ambient levels that must
be filtered out.
The receiver sees the light from the transmit side which
can be at a much higher level than the received signal
from another unit. The receiver must come out of satura-
tion fast to recover to pick up the first start bit.
Units that are designed for low power will only use the
1.6 microsecond transmit pulse, others that are not con-
cerned with power may use the 3/16 th of the bit time
over the range of 2400, 9600, 19.2k, 38.4k, 57.6k, and
115.2k BPS. The shortest pulse width allowed is 1.41 mi-
croseconds, the longest pulse at 2400 BPS is 88.55 mi-
croseconds.
IrDA Standard for Speed and Tolerance
Bit Rate
Bit Rate Tolerance Pulse Width Mini-
mum
Kbits/second
% of Bit Rate
microseconds
2.4
± 0.87
1.41
9.6
19.2
38.4
57.6
115.2
± 0.87
± 0.87
± 0.87
± 0.87
± 0.87
1.41
1.41
1.41
1.41
1.41
Pulse width 3/16
Nominal
microseconds
78.13
19.53
9.77
4.88
3.26
1.63
Pulse Width Maxi-
mum
microseconds
88.55
22.13
11.07
5.96
4.34
2.71
APPLICATIONS HINTS
The UCC5340 low pass filter input should be bypassed
with a 10µF low ESR tantalum capacitor positioned as
close to VCAPDET as possible. Connections to the
photodiode input should be short, surrounded by ground,
and as direct as possible to reduce stray capacitance and
noise pickup. To obtain maximum performance, a sepa-
rate ground plane and metal EMI shield are recom-
mended. The optical port surface of the transmit LED
and photodiode should be positioned at least one centi-
meter away from an IR optical window and equipment
case to insure that direct sunlight does not impinge onto
the photodiode surface.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
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링크공유

링크 :

관련 데이터시트

부품번호상세설명 및 기능제조사
UCC5340

IrDA Receiver

Unitrode
Unitrode
UCC5340

IrDA Receiver

Texas Instruments
Texas Instruments

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