EVM Configuration
15
SNAU236A – June 2018 – Revised December 2018
Copyright © 2018, Texas Instruments Incorporated
LMK05318EVM User's Guide
shows the suggested power configurations for the onboard XO circuits.
Table 7. Suggested XO Power Configurations
CONNECTION
NAME
ONBOARD LDO REGULATOR
(DEFAULT)
DIRECT EXTERNAL SUPPLY
LDO3 = 3.3 V (VIN3)
VCCXO or VCCLMK6 = 3.3 V
J1
PWR
Pin 1 (VIN1): Connect to external 5-V supply
Pin 2 (VIN2): n/a
Pin 3 (VIN3): n/a
Pin 4 (GND): Connect to supply ground
n/a
JP3
LDO3 IN
Tie pins 1-2: Selects 5 V from VIN1 to LDO3 IN
n/a
JP17
VCCXO
Tie pins 1-2: Select 3.3 V from LDO3
Pin 1 (LDO3): Open
Pin 2 (VCCXO): Connect to external 3.3-V
supply
Pin 3 (GND): Connect to external supply ground
JP21
VCCLMK6
Tie pins 1-2: Selects 3.3 V from LDO3
Pin 1 (LDO3): Open
Pin 2 (VCCLMK6): Connect to external 3.3-V
supply
Pin 3 (GND): Connect to external supply ground
NOTE:
Disconnect the power and signal paths from any XO circuit that is not used for a given
configuration to avoid unwanted noise coupling.
3.2
Logic Inputs and Outputs
The logic I/O pins of the DUT support different functions depending on the device start-up mode chosen
by the HW_SW_CTRL input level upon POR. The STATUS[0:1] pins are programmable and can be used
to monitor a variety of different device statuses.
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 I
2
C or SPI and
also drive the DUT logic inputs.
See
for the logic pin mapping tables for the device start-up modes.
Table 8. Logic Pin Mapping Tables
HW_SW_CTRL
(JP19)
START-UP MODE
LOGIC PIN MAPPING TABLE
0
(Tie pins 2-3)
I
2
C
(Default)
See
Float
(Tie pins 2-4)
SPI
See
1
(Tie pins 1-2)
ROM + I
2
C
See
Logic pins not listed in
or
are the same as described in
.