ADSP-21992 EZ-KIT Lite Evaluation System Manual
4-37
4.3.3 External / Internal DSP Reset Selection Jumper, JP2
JP2 enables you to select the source of reset for the ADSP-21992. When JP2 is in the 1-2
position, the ADSP-21992 can be reset from 3 external sources: pushbutton switch (S1) the
external power-on reset IC (ADM708), or through the USB interface circuitry on the ADSP-
21992 EZ-KIT Lite board. If JP2 is in the 2-3 position, the power-on reset (POR) of the ADSP-
21992 is directly connected to the reset pin of the ADSP-21992. The 1-2 position is the default
and recommended configuration when using the Vi+ development tools.
4.3.4 External/Internal Voltage Reference Selection Jumpers, JP3 and JP4
The configuration of two jumpers, JP3 and JP4, is required to control the selection of the ADSP-
21992’s internal voltage reference or the provided external voltage reference on the ADSP-21992
EZ-KIT Lite board. The appropriate settings for the jumpers to select internal or external voltage
reference operation are:
INTERNAL Reference:
JP3 in position 1-2, JP4 open
EXTERNAL Reference:
JP3 in position 2-3, JP4 closed
Please see section
for more details on voltage reference operation.
4.3.5 PWM Trip Jumper, JP5
Connecting jumper JP5 in the 2-3 position ties the
PWMTRIP
pin of the ADSP-21992 to +3.3V
via a 4.7K
Ω
resistor and enables the PWM outputs. In this case, the
PWMTRIP
pin of the ADSP-
21992 can be defined by external circuitry via the PWM connector, P10. Alternatively,
connecting jumper JP5 in the 1-2 position connects the
PWMTRIP
pin of the ADSP-21992 to
GND, thereby permanently disabling the PWM outputs. A third alternative is to leave JP5
unconnected. Again, in this case, the
PWMTRIP
pin of the ADSP-21992 is connected to the PWM
connector, P10, so that its value can be defined by external circuitry.
4.3.6 PWM Switched Reluctance Mode Jumper, JP6
Connecting JP36 in the 2-3 position ties the
PWMSR
pin of the ADSP-21992 to +3.3V and
disables the PWM switched reluctance mode. Alternatively, connecting JP6 in the 1-2 position
ties the
PWMSR
pin of the ADSP-21992 to GND and enables the PWM switched reluctance
mode.
4.3.7 PWM Polarity Jumper, JP7
Connecting JP7 in the 2-3 position ties the
PWMPOL
pin of the ADSP-21992 to +3.3V and enables
active HI PWM outputs. Alternatively, connecting JP7 in the 1-2 position creates active LO
PWM outputs from the ADSP-21992. The appropriate setting for this jumper is determined by the
exact nature of the gate drive circuit of the target system. A third alternative is to leave JP5
unconnected. In this case, its state can be determined by external hardware.
