761135 Spectrum Digital Inc, 761135 Datasheet - Page 34

• Manufacturer Part Number: 761135
• Description: CODE COMPOSR STUDIO EZDSP F28335
• Manufacturer: Spectrum Digital Inc
• Type: DSPr

Specifications of 761135

• Contents: Board, Cable, CD, Power Supply
• Positions/sockets: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TMS320F28335
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Spectrum Digital, Inc
2.4.1 JP1, ADCREFIN Select
2.4.2 JR2, XTPD Voltage Select
2-20
Jumper JP1 is used to connect the output of U29, REF3020 to ADCREFIN. When the
jumper is shorted the +2.048 voltage level is routed to the ADCREFIN signal of the
DSC. When the jumper is open the ADCREFIN floats.The positions are shown in the
table below.
The layout of this jumper is shown in the figure below.
Jumper JR2 is a surface mount jumper located on the bottom side of the board. To
use a configuration a zero ohm resistor should be used for shorting. This jumper is
used to select either +3.3 or +5 volts to be touted to the XTPD pin on the external JTAG
header P1, pin 5. In configuration A, +5 volts is routed to XTPD. When configuration
B is selected +3.3 volts is routed to XTPD. This is shown below.
The layout of this jumper is shown in the figure below.
Shorted *
Position
Open
Table 17: JP1, U29, Pin 2 to ADCREFIN Select
* as shipped from factory
* default
Configuration
Table 18: JR2, XTPD Voltage Select
Configuration A
+5V
Installed/shorted
A *
1
B
Output of U29 (+2.048V) connected to ADCREFIN
JR2
Figure 2-16, Jumper JR2
Figure 2-15, Jumper JP1
DSC
JP1
Use internal reference for ADCREFIN
3
+3.3 volts routed to XTPD
+5 volts routed to XTPD
Function
Function
Configuration B
eZdsp
1
Open
DSC
JP1
JR2
TM
+3.3V
3
F28335 Technical Reference