參數(shù)資料
型號(hào)： DS2480
廠商： Maxim Integrated Products, Inc.
英文描述： Serial 1-Wire Line Driver(1線串行線驅(qū)動(dòng)器)
中文描述： 串行、1-Wire線驅(qū)動(dòng)器
文件頁(yè)數(shù)： 22/26頁(yè)
文件大?。?/td> 191K
代理商： DS2480
DS2480
042498 22/26
+
12V RS232
Figure 10c
START
1–WIRE BUS
RETURN
V
DD
V
PP
RXD
TXD
POL
1–W
GND
UART
OR
μ
C
5V
(5V)
STOP
0
1
L
M
DTR
VOLTAGE
REGULATOR
DS2480
12V
RTS
RXD
TXD
GND
SEE TEXT
POWER
STEALING
2.7 k
6.8 k
4.7V
1
μ
BSS110
S
D
In the interface to a true RS232C system (
±
12V, Figure
10c) the power for the DS2480 is stolen from DTR and
RTS. The software must make sure that at least one of
these signals constantly provides the 12V operating
voltage. The 6.8 k
resistor and the 4.7 V Zener diode in
the TXD line limit the positive voltage at the TXD pin of
the DS2480. The Schottky diode limits the negative volt-
age to 0.3V maximum. The Schottky diode in series with
the capacitor forms a parasitic supply to generate the
negative bias for the host’s receive channel. The posi-
tive signal is switched in through the P–channel MOS-
FET that connects to the RXD output of the DS2480. In
this circuit diagram the MOSFET switches the RXD line
to +5V, which normally is sufficient for RS232C
systems.
Switching to 12V is also possible, but requires a
P–channel transistor with a different threshold voltage.
The signal inversion caused by the transistor is com-
pensated through the DS2480 by using a value code of
100, 101, 110 or 111 for the RS232 baud rate setting.
UART DIRECT OPTO ISOLATED
Figure 10d
START
1–WIRE BUS
RETURN
V
DD
V
PP
RXD
TXD
POL
1–W
GND
UART
OR
μ
C
5V
(5V)
STOP
0
1
L
M
SIN
DS2480
12V
HCPL–2300
OPTOCOUPLER
5V
SOUT
2.7 k
6.8 k
2.7 k
DC TO DC
CONVERTER
The circuit in Figure 10d is essentially the same as in
Figure 10a. The main difference is the opto–isolation.
The characteristics of the opto–isolators are not very
critical. Using a different type, will affect the values of the
resistors that limit the current through the LEDs and bias
the photo transistors.
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參數(shù)描述
DS2480B 功能描述:緩沖器和線路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel
DS2480B 制造商:Maxim Integrated Products 功能描述:IC SERIAL LINE DRIVER 2480 SOIC8
DS2480B/T&R 功能描述:緩沖器和線路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel
DS2480B+ 功能描述:緩沖器和線路驅(qū)動(dòng)器 Serial - 1-Wire Line Driver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel
DS2480B+R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver
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