NXP Semiconductors QorIQ LS1028A Reference Manual page 17

3V3
PS_DDR_EN
PS_DDRREG_PG_B
To CPLD
3V3
PS_3V3_EN
POR_OUT_VR500_B
to CPLD
PS_VDD_EN
{
PS_DDR_EN
to regulators
3.3V
1.8V
SD_VSEL
from LS1028
3.3V
BAT
Note that several power supplies have onboard low-pass filters, to prevent board
switching noise from coupling into sensitive analog supplies. The figure below shows the
filters used.
QorIQ LS1028A Reference Design Board Reference Manual, Rev. A, 02/2018
NXP Semiconductors
GVDD
MC34716EP/R2
1.2V @ 5A
DDR4 VDDQ,
VTT, VREF
VDDQ,SINK/SOURCE
DDR TERMINATION
SD_B
REGULATOR
PVIN1:4
VLDOIN
1.0V @ 1.1A
VOUT1
2.5V @0.8A
VOUT2
VR500
1.35V @ 0.4A
VOUT3
EN
PORB
1.8V @ 2.5A
LDO2 VOUT4
LDO4
EVDD SWITCH
3.3V/1.8V
FPF1321UCX
SD_VS EL: EV DD
0 : 3.3V
1 : 1.8V
3V_STBY
TA_BB_VDD
MAX8902B
0.9V/1.0V @ .15A
Figure 2-2. Power supplies - Part 2
5.1OHm
0.33OHm
10uF 1uF 47uF
0.22uF
LPF
LPF
Figure 2-3. Passive low pass filters
Confidential Proprietary
Chapter 2 LS1028ARDB Functional Description
1V2
VCC_GVDD_S
DRAM VDD
LS1028 VCC_GVDD
VTT-0V6
VTT
DRAM VTT
MVREF-0V6
0.60V @ 3A
VREFCA_S
DRAM VREFCA_S
0.60V @ 3A
1V0
QSGMII PHY VDD, VDDA
2V5
QSGMII PHY VDD25, VDD25A
DDR4 MEMORY VPP
1V35
X1VDD
LS1028 X1VDD
1.35V
LPFx2
AVDD_SD LS1028 AVDD_SD1_PLL1
LS1028 AVDD_SD1_PLL2
1.35
LPFx4
1V8
BOARD COMPONENTS
CLOCKGEN VDD & VDDA
CPLD IO BANK3
UART TRANSCEIVER
XSPI MEMORIES
eMMC MEMORY IO VDD
MISC PARTS (BUFFERS & TRANSLATORS)
LS1028 OVDD, TH_VDD
HDR 1x2
LS1028 PROG_MTR
1K
HDR 1x2
LS1028 TA_PROG_SFP
1K
LS1028 AVDD_CGA1
LS1028 AVDD_CGA2
LPFx6 LS1028 AVDD_PLAT
LS1028 DP_SAVDD
LS1028 AVDD_D1
LS1028 AVDD_PIXEL
EVDD
LS1028 EVDD
TA_BB_VDD
LS1028 TA_BB_VDD
2.2uF
2.2uF
4.7uF
3nF
LPF
2.2uF=NFM18P C225B1A3
2.2uF=G RM155R 60J225K E95
17