參數(shù)資料
型號: PP-MOD1V2
英文描述: ISP INTERFACE MODULE
中文描述: ISP的接口模塊
文件頁數(shù): 47/48頁
文件大?。?/td> 3471K
代理商: PP-MOD1V2
ISP Interface Module Version 1.00 27/06/01
40
9.5 Opto-Isolated input start
9.5.1 Overview
This configuration allows a PPM programming project to be initiated by an external voltage
being applied to J6. e.g. a voltage derived from the test fixture.
9.5.2 Circuit Implementation
To use this configuration LNK 4 must be inserted on the PIM. This allows the Target System
to be powered by the PPM. The Target Vcc should be connected to the T_VCC connection
on J4 or to ‘Target Vcc’ on J1 or J2. The circuit comprising of R1, R2, R3, U1 & D1 senses
the presence of an isolated voltage applied to connector J6. This voltage can be used to
trigger the start and end of an auto-programming sequence. To use this method requires a
DC voltage in the range of +15 to +30V applied to connector J6. If you require an input
voltage outside of this range then R1 can be changed accordingly.
Figure 58 - Opto-Isolated Auto-Program Start
Designator
D1
R1
R2
R3
U1
Value
1N4148
1K5
1K5
4K7
6N136
Figure 59 – Component values for figure 60
Please note:
ZD1 should be a 6.2V Zener diode to protect the PPM Line Driver pins (now fitted as
standard on PIM Iss2 V2)
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