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)： 23/26頁(yè)
文件大小： 191K
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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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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