Configuring the EVM
4.2
Configuring the Control Pins
The LMK03328 has multiple external control pins to configure the operating mode and initial settings on
POR (see
). Depending on the selected mode, some control pins will change between 2-level, 3-
level, or 8-level input scheme to increase the amount of control with a limited number of pins.
The LMK03328 control pins can be configured through the jumpers and switches shown in
Figure 4. Control Pin Interfaces (Default Jumper Settings)
Jumpers JP17 through JP24 can be used to configure the corresponding control pin to either high or low
state by strapping the center pin to “HI” position (tie pins 1-2) or “LO” position (tie pins 2-3), respectively.
Jumpers JP17, JP20, JP21, and JP22 can be used to configure the control pin with 3-level input scheme,
where V
LO
< 0.4V, V
MID
~ 0.9V, V
HI
> 1.4V. Each of these 4 jumpers use a resistor divider network to bias
the control pin to a mid-level state of 0.9 V, when the jumper is left open (“MID” position).
The LMK03328 control pins perform different functions depending on the mode of operation.
•
For
Soft Pin Modes
or
Register Default Mode
, refer to
for jumper and switch descriptions.
•
For
Hard Pin Modes
, refer to
. Jumpers not listed in
have identical functions described
in
11
SNAU184 – August 2015
LMK03328EVM User’s Guide
Copyright © 2015, Texas Instruments Incorporated
