參數(shù)資料
型號(hào): PP-MOD1V2
英文描述: ISP INTERFACE MODULE
中文描述: ISP的接口模塊
文件頁(yè)數(shù): 45/48頁(yè)
文件大?。?/td> 3471K
代理商: PP-MOD1V2
ISP Interface Module Version 1.00 27/06/01
38
9.4 Presence of Independent Target Power Supply
9.4.1 Overview
This configuration allows a PPM programming project to be initiated by the programmer
sensing the presence of the Target Supply Voltage.
9.4.2 Circuit Implementation
To use this configuration LNK4 must NOT be inserted on the PIM and a LNK5 must be
inserted. The circuit comprising of R7/R8/R17, D2 & TR1 asserts the PPM_V_OUT pin LOW
when a suitable Target Voltage is applied to the PIM. This detection method allows an
Autoprogram sequence to be triggered when the Target Vcc is applied. Once the
programming sequence has finished and the Target Vcc is manually removed, the PIM will
allow the PPM_V_OUT pin to go HIGH, thus ending the programming sequence. The Target
Vcc should be connected to the T_VCC connection on J4 or to ‘Target Vcc’ on J1 or J2.
Figure 56 - Power supplied by an external power supply when target draws insufficient current to initiate direct sensing of
target.
Designator
R17
R7
R8
D2
TR1
Value
22k
47K
220R
IN4148
BC337
Figure 57 – Component values for figure 56
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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