欢迎访问ic37.com |
会员登录 免费注册
发布采购

EPC703 参数 Datasheet PDF下载

EPC703图片预览
型号: EPC703
PDF下载: 下载PDF文件 查看货源
内容描述: 24V / 50毫安通用输出驱动器 [24V/50mA General-Purpose Output-Driver]
分类和应用: 驱动器
文件页数/大小: 11 页 / 264 K
品牌: EPC [ ESPROS PHOTONICS CORP ]
 浏览型号EPC703的Datasheet PDF文件第3页浏览型号EPC703的Datasheet PDF文件第4页浏览型号EPC703的Datasheet PDF文件第5页浏览型号EPC703的Datasheet PDF文件第6页浏览型号EPC703的Datasheet PDF文件第8页浏览型号EPC703的Datasheet PDF文件第9页浏览型号EPC703的Datasheet PDF文件第10页浏览型号EPC703的Datasheet PDF文件第11页  
epc701/epc703  
Programming  
The time delay (tdel), until the output is turned off after the detection of an over-current condition can be programmed in order to adapt the ti-  
ming to specific requirements, i.e., if a capacitive load has to be operated or an external transistor allows other values. The default value is  
50μs which allows to charge a load capacitor of approx. 100 – 500nF without an external power transistor, dependent on the source impe -  
dance, the load impedance and the voltage V L.  
The time until the output is turned on again after a short circuit can be programmed as well (tminOFF). This “self-healing” mechanism is very use-  
ful because no operator interaction is necessary after a short circuit to enable normal function once the short circuit has been eliminated. The  
default value is 500ms which means that the device tries to turn the output on after 0.5s waiting time in the short circuit mode. This waiting  
time is recommended as long as tdel is not changed. If tdel has been changed, the parameter tminOFF shall be changed accordingly in order to  
respect parameter frt. The user has to ensure that the maximum operation conditions are never exceeded in order to avoid damage of the  
device.  
It is to note that the parameters programmed are stored in a non-volatile random access memory. Thus, the parameters can be lost after a  
power down for longer than 5ms (data retention time @ 25ºC: min. 100ms). The corresponding requirements for safety applications have to  
take in consideration. Parameters can be changed as many times as necessary and even under operation to change the behavior of an  
output. During power-on, the default values are restored automatically.  
Programming Interface  
The interface to store changed parameters are the pins IN and STATUS. IN is the chip select pin and STATUS, which is under normal opera -  
tion an output, is used as an input pin. As long as the IN pin is at low state, parameters can be stored through the STATUS pin. Since IN is low  
during the programming of new parameters, OUT is low as well.  
The digital input high threshold is typically at 2.2V, thus a 5V compatible communication. Please note that the voltage at STATUS should not  
exceed 5.5V, referenced to GND.  
Single Wire Communication Interface  
The epc70x is based on a single wire communication interface by using the STATUS pin. Programming is done by a 21-Bit Manchester code  
according to IEEE 802.4.  
Clock  
(internal)  
Data  
1
0
0
1
1
0 0  
Manchester  
code  
Figure 8: Manchester encoding sample  
Figure 8 shows such a sample Manchester encoded data-stream. The clock and the corresponding data is used to generate the Manchester  
data-stream. Each positive clock-edge in the Manchester encoded data (indicated with the up-arrow) corresponds to a 1 and each negative  
clock-edge (indicated with the down-arrow) corresponds to a 0.  
Data Clock Frequency Range  
The communication frequency range has to be according to Table 1.  
minimal typical  
396kHz 450kHz  
maximum  
540kHz  
Data clock  
Table 1: Frequency range for programming  
Configuration Bit Stream for changing the delay time  
In order to guarantee a reliable communication with the Manchester encoded bit stream on STATUS, some additional bits have been added to  
the configuration bits. Table 2 shows the digital pattern for the delay time configuration and the recovery time configuration.  
Bit #  
0
1
1
1
0
0
2
1
1
3
1
1
4
0
0
5
0
0
6
0
0
7
0
0
8
0
1
9
1
0
10  
1
11  
1
12  
1
13  
0
14  
15  
16  
17  
1
18  
d1  
o1  
19  
d2  
o2  
20  
d3  
o3  
tDel Value  
TminOFF Value  
D1 D2 D3  
O1 O2 O3  
0
0
1
0
1
Table 2: Configuration of the delay and the recovery time  
© 2011 ESPROS Photonics Corporation  
Characteristics subject to change without notice  
7
Datasheet epc701_703 - V2.2  
www.espros.ch