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Controls and Indicators
factory-set with a jumper on its 2–3 positions so that THERM1 is connected to GND (see
Figure 4-2).
.
JP7
3
2
1
GND
THERM1
THERM0
Figure 4-2. JP7 Therm Connector
4.1.9
IDDH Measurement—JP14
JP14 resides in IDDH’s main current flow. To measure IDDH, JP14 should be removed
using a solder tool and a current meter should be connected with wires that are as short and
thick as possible.
Warning
The job of removing JP14 and soldering current meter
connections instead is very delicate, and should be done by a
skilled technician.
If this process is done by unskilled hands or repeated more than
3 times, the MPC8272ADS can be permanently damaged.
4.1.10 V PP Source Selector—JP4
JP4 selects the source for V PP programming voltage for the Flash SIMM. When a jumper
is located between pins 2 and 3 of JP4, the V PP is connected to the VCC plane of the board,
providing 5 V V PP . When a jumper is located between positions 1 and 2 of JP4, V PP is
drawn from the 12-V plane that provides 12V V PP . JP4 options are shown in Figure 4-3.
.
1
JP4
12V V PP
1
JP4
5V V PP
Factory-Set
Figure 4-3. JP13 V PP Source Selection
Chapter 4. Operating Instructions
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