Spectrum Digital EVM320LF2407A Technical Reference page 32

2.11.8 Jumper JP8, VREFHI Select
Jumper JP8 is used to select the source for the VREFHI pin on the TMS320LF2407.
Position 1-2 selects the VCCA power which is +3.3 volts. If position 2-3 is used trim pot
R1 is used which allows a variable VREF High from 0-3.3 volts. The table below shows
the positions and their functions.
2.11.9 Jumper JP9, VREFLO Select
Jumper JP9 is used to select the source for the VREFLO pin on the TMS320LF2407.
Position 1-2 selects the Analog ground. If position 2-3 is used trim pot R2 is used
The table below shows the positions and their functions.
2.11.10 Jumper JP10, Enable/Disable Host Reset via DTR-
Jumper JP10 allows the generation of system resets from the serial port P7. When
position 2-3 is used this feature is enabled meaning the system is reset when pin 4
(DTR-) is pulled low. This feature is disabled when position 1-2 is used. The table
below shows the positions and their functions.
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Table 18: Jumper JP8
Position Function
1-2 VCCA (+3.3V VrefH)
2-3 Trim Pot R1 (0-3.3V VrefH)
Table 19: Jumper JP9
Position Function
1-2 Analog Ground (VrefL)
2-3 Trim Pot R2 (0-3.3V VrefL)
Table 20: Jumper JP10
Position Function
1-2 Disabled
2-3 Reset from P4, pin4
(DTR-) enabled
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