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參數(shù)資料
| 型號： | MAX3131CAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 2X2 1.5 Gbps LVDS Crosspoint Switch 16-TSSOP -40 to 85 |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO28 |
| 封裝： | 5.30 MM, 0.65 MM PITCH, SSOP-28 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 220K |
| 代理商： | MAX3131CAI |
M
3V to 5.5V, IrDA Infrared Transc eiver with
Integrated RS -232 Interfac e
______________________________________________________________________________________
11
IR T ransmitter
The infrared transmitter consists of an internal high-
power, open-drain MOSFET switch. This switch has an
on-resistance of less than 2
and is capable of switch-
ing 200mA of current. Internal buffering keeps the input
capacitance of the TXD pin extremely low to ease user
drive requirements. Connect an IR LED in series with a
current-setting resistor to select the appropriate IR out-
put power (see the Powering the IR LED section). The
transmitter is not current limited so do not exceed the
power dissipation of the external components during
high duty-cycle transmit schemes.
The TXD input controls the IR LED for the MAX3131.
The T2IN input controls the IR LED for the MAX3130
(
IRMODE
= low). With the ENDEC disabled (see IrDA
Encoder/Decoder (ENDEC) section), the IR LED is
turned on by a logic-high signal at the TXD or T2IN
input, for the MAX3131 and MAX3130 respectively.
IRMODE
: Multiplexed RS -232 Operation
and IrDA Operation (MAX 3130)
The MAX3130 has the capability to multiplex R2OUT and
T2IN between the IrDA infrared interface and the RS-232
electrical interface. The state of the
IRMODE
input deter-
mines which interface (infrared or RS-232) is multiplexed
to R2OUT and T2IN. When
IRMODE
is low, R2OUT acts
as the infrared receiver output and T2IN acts as the
infrared transmitter input. Also, while
IRMODE
is low, the
RS-232 charge pumps are shut down and the RS-232
transmitters are disabled (see Shutdown section). When
IRMODE
is high, R2OUT and T2IN assume their func-
tions as the RS-232 data receive output and transmit
input, respectively. Also, while
IRMODE
is high, the IR
transmitter is disabled (turned off).
EDGEDET
: Edge-Detec tion Circ uitry
(MAX 3130)
The MAX3130 has internal edge-detection circuitry that
monitors the RS-232 R2OUT line when
IRMODE
is low
and monitors the IrDA receive channel when
IRMODE
is high.
EDGEDET
goes low when a positive or negative
edge is detected on either the RS-232 R2OUT line or
the IrDA receive channel (depending on the
IRMODE
pin). This edge-detection feature is useful for initiating
an interrupt when data is received on the deselected
line. The
EDGEDET
signal is cleared when
IRMODE
is
toggled. Table 1 shows
EDGEDET
operation.
IrDA Enc oder/Dec oder (ENDEC)
The MAX3130 and MAX3131 provide an on-board
ENDEC to communicate with UARTs that are not IrDA
compatible. The ENDEC is enabled by applying a clock
with a frequency 16 times the baud rate to the BAUD16
input. This BAUD16 clock is commonly provided on
UARTs that do not have IrDA ENDEC capability. Figure
3 illustrates the operation of the ENDEC. The ENDEC
stretches the incoming infrared pulse (a pulse between
IRSD
X
X
X
X
RSSD IRMODE
X
X
X
X
R2IN
IrDA RxIN
X
X
EDGEDET
*
0
0
1
1
X
X
Table 1.
EDGEDET
Operation
1.41
μ
s < t < 3CS
16CS
32CS
16CS
R2OUT (RXD)
WITH ENDEC ENABLED
R2OUT (RXD)
WITH ENDEC DISABLED
CS = BAUD16 CLOCK CYCLES
* HIGH = INFRARED LIGHT PULSE
( ) ARE FOR MAX3131
INFRARED
PHOTODIODE INPUT *
Figure 3a. ENDEC Operation, Receiving Infrared
X = Don’t care
*
EDGEDET
is cleared by any transition on
IRMODE
.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3131CAI-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3131EAI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3131EAI+ | 功能描述:RS-232接口集成電路 3-5.5V IrDA Infrared Tcvr w/RS-232 Int RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3131EAI+T | 功能描述:RS-232接口集成電路 3-5.5V IrDA Infrared Tcvr w/RS-232 Int RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3131EAI-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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