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参数资料
| 型号： | DS2480 |
| 英文描述： | Serial 1.Wire Line Driver |
| 中文描述： | 串行、1-Wire线驱动器 |
| 文件页数： | 22/26页 |
| 文件大小： | 185K |
| 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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PDF描述 |
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| DS2490S | USB to 1-Wire Bridge Chip |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2480B | 功能描述:缓冲器和线路驱动器 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装: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:缓冲器和线路驱动器 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| DS2480B+ | 功能描述:缓冲器和线路驱动器 Serial - 1-Wire Line Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| DS2480B+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Serial to 1-Wire Line Driver |
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