Using the AT89RFD-08 Board
AT89RFD-08 Hardware User Guide
2-17
4382E–MP3–05/06
2.9
Electrical
Parameter
Measurement
The AT89RFD-08 Reference Design is designed to enable easy measurement of elec-
trical parameters on the board. 6 configuration pads can be used either for voltage
measurements or for current measurements.
2.9.1
Configuration Pad
A configuration pad configures the AT89RFD-08 Board Demo Board for custom applica-
tion. The configuration is programmable by cutting a specific part (wire) of the
configuration pad. To return to the initial configuration, users must to solder a short
jumper (wrapping wire or solder drop) to replace the cut connection.
Figure 2-18.
Configuration Pad
2.9.2
AT89C51SND2C
Configuration Pads
There are 6 configuration pads are implemented close to the AT89C51SND2C power
supply generator:
n UVDD - USB interface power supply
n PVDD - PLL power supply line
n HSVSS - Audio interface reference voltage
n VDD - Processor digital power supply
n AUDVDD - Processor analog power supply
n AUDVBAT - Audio interface reference voltage
Refer to AT89RFD-08 schematics for configuration pads position.
0.75 mm
O: 0.75 mm
Free Area
Cut Connection
OPEN
CLOSED