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 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 VDD Plane
•
Tie pins 3-4 to select 3.3 V
from LDO2 to VDDO Plane
•
Tie pins 5-6 (adjacent
to designator) to select
external VIN2 to VDDO
Plane
JP3
XO
•
Tie pins 1-2 (opposite to
designator) to select 3.3V
from DCDC1 to XO supply
•
Tie pins 3-4 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 LMK5B33414 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
LMK5B33414 logic inputs. To allow the MCU to control the pin input, SW[2] 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
0
I
2
C Mode
1
SPI Mode
(1)
The input levels on these pins are sampled only during POR.
EVM Configuration
SNAU279 – JULY 2022
LMK5B33414EVM User's Guide
9
Copyright © 2022 Texas Instruments Incorporated
