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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： | 23/26页 |
| 文件大小： | 185K |
| 代理商： | DS2480 |
DS2480
042498 23/26
+
5 TO 12V RS232 OPTO ISOLATED
Figure 10e
START
1–WIRE BUS
RETURN
V
DD
V
PP
RXD
TXD
POL
1–W
GND
UART
OR
μ
C
5V
STOP
0
1
L
M
DTR
5V
REGULATOR
DS2480
RTS
RXD
TXD
GND
POWER
STEALING
1
μ
HCPL–2300
5.1 k
HCPL–2202
1.5 k
POWER
SUPPLY
12V
2.7 k
The circuit in Figure 10e combines the true RS232C
interface with opto–isolation. The energy to power the
LED in the TXD channel and to provide the positive volt-
age for the host’s RXD input is stolen from DTR and
RTS. The negative voltage for the RXD input is taken
from the TXD line through a parasitic supply consisting
of a Schottky diode in series with a capacitor. The
HCPL–2202 opto–isolator has a totem pole output that
allows switching in positive as well as negative voltage.
The +5V are sufficient for most RS232C systems.
Switching in 12V requires a opto–isolator with different
voltage characteristics.
In the schematic the HCPL–2202 opto–isolator is
sourced by the RXD pin of the DS2480. It can as well be
connected the traditional way where the DS2480 sinks
the current through the LED. This, however, causes a
signal inversion that has to be compensated through the
DS2480 by using a value code of 100, 101, 110 or 111 for
the RS232 baud rate setting. Using other types of opto–
isolators than shown in the schematic will at least
require changing the values of the resistors.
RS232 DATA TIMING RXD LINE
Figure 11
START
t
FR
t
RR
t
IDLER
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
STOP
T
R
(DIAGRAM DRAWN FOR POL = 5V)
10 T
R
RECEIVE DELAY TIMING
Figure 12
t
RESP
INPUT SAMPLING 8.5T
R
9.5T
R
RXD
TXD
START
BIT 0
BIT 6
BIT 7
STOP
(DIAGRAM DRAWN FOR POL = 5V)
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PDF描述 |
|---|---|
| DS2480S | Serial 1.Wire Line Driver |
| DS2490 | USB to 1-Wire Bridge Chip |
| DS2490S | USB to 1-Wire Bridge Chip |
| DS2502-E64 | IEEE EUI-64 Node Address Chip |
| DS26334 | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
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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