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SNAU236A – June 2018 – Revised December 2018
Copyright © 2018, Texas Instruments Incorporated
LMK05318EVM User's Guide
User's Guide
SNAU236A – June 2018 – Revised December 2018
LMK05318EVM User's Guide
1
EVM Quick Start
This quick start guide can be followed to evaluate the LMK05318 DUT with the default EVM and device
configurations summarized in
and
1. Verify the EVM default jumper and DIP switch settings shown in
and
:
Table 1. Default Jumper and DIP Switch Settings
CATEGORY
REF DES
POSITION
DESCRIPTION
Power
JP1
Tie pins 1-2
DUT VDD = 3.3 V from LDO1
JP2
Tie pins 1-2
DUT VDDO = 1.8 V from LDO2
JP3
Tie pins 1-2
LDO3 IN powered from VIN1 external supply
JP4
Tie pins 1-2
1.8 V selected as LDO2 output voltage
JP16
Tie pins 1-2
VDDGPIO = 3.3 V
JP17
Tie pins 1-2
XO VCC = 3.3 V from LDO3
JP21
Tie pins 2-3
LMK61E2 VCC = GND (Powered off)
JP22
Tie pins 2-3
DC-DC Regulator VIN = GND (Powered off)
JP23
Tie pins 2-3
Communication
JP20
Tie pins 1-2, 3-4,
11-12, and 13-14
DUT I
2
C connected to MCU
S9
S9[1:2] = OFF
LMK61E2 I
2
C not connected to MCU
DUT Control
Pins
JP18
Tie pins 2-3
REFSEL = 0: PRIREF selected if using Manual Pin mode
JP19
Tie pins 2-3
HW_SW_CTRL = 0: I
2
C Start-up Mode selected
S2
S2[1:3] = OFF
S2[4] = ON
STATUS0 = Hi-Z: Output state shown on D7. Pin not connected to MCU.
S3
S3[1:3] = OFF
S3[4] = ON
STATUS1/FDEC = Hi-Z: Output state shown on D8. Pin not connected to
MCU.
S5
S5[1] = ON
S5[2:3] = OFF
GPIO0/SYNCN = 1: SYNC deasserted. Pin not connected from MCU.
S6
S6[1] = OFF
S6[2:3] = ON
GPIO1/SCS = 0: I
2
C slave address = 0x64. Pin connected to MCU.
S7
S7[1] = OFF
S7[2:3] = ON
GPIO2/SDO/FINC = 0: Not used by default. Pin connected to MCU.
DUT Loop Filter
Pins
S1
S1[1] = ON
S1[2:4] = OFF
LF1 = 0.47
μ
F
S10
S10[1] = ON
S10[2] = OFF
LF2 = 0.1
μ
F
2. C5 V from an external DC power supply (1-A limit) across the VIN1 and GND terminals of
header J1 (pins 1 and 4).
3. Toggle switch S4 (PDN/RESET) to reinitialize the DUT registers from on-chip EEPROM, if needed.
4. Check that the LEDs D7 and D8 are both ON if there is no valid clock input on PRIREF or SECREF.
This indicates that the DPLL is not locked and that the DPLL holdover is active.
a. When the DPLL is not locked, the clock outputs will free-run and track the frequency stability and
accuracy of the XO (Y1).
5. Connect an external 25-MHz single-ended clock input to either the PRIREF or SECREF SMA port to