Table 3-2. Suggested Power Configurations
CONNECTION
NAME
ONBOARD DC/DC SUPPLY
(DEFAULT)
ONBOARD LDO REGULATORS DIRECT EXTERNAL SUPPLIES
VDD = 3.3 V (DCDC1)
VDDO = 3.3 V (DCDC1)
XO = 3.3 V (DCDC1)
VDD = 3.3 V (LDO1)
VDDO = 3.3 V (LDO2)
XO = 3.3 V (LDO3)
VDD = 3.3 V (EXT. VIN1)
VDDO = 3.3 V (EXT. VIN2)
XO = 3.3 V (EXT. VIN3)
J500
PWR
•
Pin 1 (VIN1): n/a
•
Pin 2 (VIN2): n/a
•
Pin 3 (VIN3): n/a
•
Pin 4 (VIN4): Connect to
external 12-V supply
•
Pin 5 (GND): Connect to
supply ground
•
Pin 1 (VIN1): Connect to
external 5-V supply
•
Pin 2 (VIN2): n/a
•
Pin 3 (VIN3): n/a
•
Pin 4 (VIN4): n/a
•
Pin 5 (GND): Connect to
supply ground
•
Pin 1 (VIN1): Connect to
external 3.3-V supply
•
Pin 2 (VIN2): Connect to
external 3.3-V supply
•
Pin 3 (VIN3): Connect to
external 3.3-V supply
•
Pin 4 (VIN4): n/a
•
Pin 5 (GND): Connect to
supply ground
JP1
VDD
•
Tie pins 1-2 (opposite to
designator) to select 3.3 V
from DCDC1 to VDD Plane
•
Tie pins 3-4 (middle pins) to
select 3.3 V from LDO1 to
VDD Plane
•
Tie pins 5-6 (adjacent to
designator) to select external
VIN1 to VDD Plane
JP2
VDDO
•
Tie pins 1-2 (opposite to
designator) to select 3.3 V
from DCDC1 to VDDO Plane
•
Tie pins 3-4 (middle pins) to
select 3.3 V from LDO2 to
VDDO Plane
•
Tie pins 5-6 (adjacent to
designator) to select external
VIN2 to VDDO Plane
JP4
XO
•
Tie pins 1-2 (opposite to
designator) to select 3.3 V
from DCDC1 to XO supply
•
Tie pins 3-4 (middle pins) to
select 3.3 V from LDO3 to
XO supply
•
Tie pins 5-6 (adjacent to
designator) to select external
VIN3 to XO supply
3.2 Logic Inputs and Outputs
The logic I/O pins of the LMK5B33216 support different functions depending on the device start-up mode chosen
by the GPIO1 input level upon POR.
The default logic input pin states are determined by onboard pullup or pulldown resistors, but some input pins
can be driven to high or low state by the MCU output or DIP switch control. The MCU can be controlled
from a PC running TICS Pro software to program the device registers through I2C or SPI and also drive the
LMK5B33216 logic inputs. To allow the MCU to control the pin input, SW[2] of the DIP switch correlating with
controlled GPIO must be set to on.
See
for the logic pin mapping tables for the device start-up modes.
Table 3-3. Device Start-Up Modes
GPIO1 INPUT LEVEL
START-UP MODE
Low
I
2
C Mode
High
SPI Mode
(1)
The input levels on these pins are sampled only during POR.
EVM Configuration
SNAU263A – FEBRUARY 2022 – REVISED JULY 2022
LMK5B33216EVM User's Guide
9
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