Configuring the EVM
summarizes the EVM power configurations to connect and route power to the VDD and VDDO
supply domains of the LMK03328. Refer to
for more details.
Table 2. Power Configurations
On-board Regulators
CONNECTION
NAME
Direct Single Supply
Direct Dual Supply
(Default)
LMK03328
VDD[x]
3.3 V
3.3 V
3.3 V
VDD pins
LMK03328
VDDO[x]
1.8 / 2.5 / 3.3 V
3.3 V
1.8 / 2.5 / 3.3 V
VDDO pins
J1
EXTVDD
Alternative SMA power connection to J3 pins 1 & 3
J2
EXTVDDO
Alternative SMA power connection to J3 pins 2 & 3
-Pin 1 (EXTVDD): Connect to
-Pin 1 (EXTVDD): Connect to
-Pin 1 (EXTVDD): Connect to
3.3-V supply
5-V supply
3.3-V supply
-Pin 2 (EXTVDDO): Connect to
J3
PWR
-Pin 2: N/A
-Pin 2: N/A
1.8 / 2.5 / 3.3 V supply
-Pin 3 (GND): Connect to GND -Pin 3 (GND): Connect to GND
-Pin 3 (GND): Connect to GND
supply
supply
supply
Tie pins 2-3:
JP1
(1)
LDOIN
Selects 5 V from EXTVDD to
N/A
N/A
operate regulators
Tie pins 2-3:
Tie pins 2-3:
Tie pins 1-2:
JP2
VDD
Selects 3.3 V directly from
Selects 3.3 V directly from
Selects VDD = 3.3 V from U3
EXTVDD
EXTVDD
Tie pins 1-2:
Tie pins 2-3:
Tie pins 2-4:
JP3 & J4
(2)
VDDO
Selects VDDO = 1.8 / 2.5 / 3.3
Selects 1.8 / 2.5 / 3.3 V
Selects 3.3 V from VDD
V from U4
directly from EXTVDDO
-Open (JP8 Default):
Selects VDDO = 1.8 V
-Tie pins 1-2:
JP8
LDOSEL (U4)
N/A
N/A
Selects VDDO = 3.3 V
-Tie pins 2-3:
Selects VDDO = 2.5 V
(1)
In typical configurations, the LMK03328EVM can consume more current than USB 2.0 limit of 0.5 A. Thus, it is advised to not
use the USB5V rail to power the on-board LDO regulators (i.e. do not tie pins 1-2 on JP1), unless the LMK03328 device
configuration and peripheral circuitry are assured to never exceed 0.5 A current limit set by the TPS2553 USB switch (U10). The
LMK03328 may not initialize / operate properly when current limited.
(2)
JP3 and J4 form a 3-way header where J4 is pin 4.
10
LMK03328EVM User’s Guide
SNAU184 – August 2015
Copyright © 2015, Texas Instruments Incorporated
