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Table 4. LS1046ARDB power supply devices (continued)
Reference
designator
Device
Power supply
voltage
Description
LDO3: +2V5 (2.5 V at
0.35 A)
• Supply for processor TVDD
• Supply for DDR4 memory VPP
• Supply for AQR107 PHY VDD_IO and AQR PHY
JTAG header
U57
MC34716EP (NXP
Semiconductors)
+1_2V (1.2 V at 4 A)
• Supply for DDR controller input/output (GVDD)
• Supply for DDR4 DIMM socket
DDR_VTT (0.6 V at 3
A)
Supply for DDR address and control bus termination
(VTT)
DDR_VREFCA (0.6 V
at 0.01 A)
VREFCA supply for DDR4 DIMM socket
U507
LT3085 (Linear
Technology)
+1_5V_MPCIE1 (1.5
V at 0.5 A)
Supply for mini-PCIe slot
U13
LT3065 (Linear
Technology)
2V1 (2.1 V at 0.5 A)
VA21 supply for AQR107 PHY
U12
LT3065 (Linear
Technology)
AQR_1V2 (1.2 V at
0.5 A)
VA12 supply for AQR107 PHY
2.1.3 Power supply sequence
When the LS1046ARDB is connected to an AC power outlet through a 12 V DC power adapter and the power switch on the board
is turned ON, the board gets 12 V input power. With the 12 V power available, the remaining power supplies are automatically
turned ON by CPLD in the following sequence:
1. DVDD, EVDD, XVDD, OVDD, LVDD, TH_VDD, 0V85, 2V1, AQR_1V2, USB_HVDD, AVDD_CGA[1:2], AVDD_PLAT,
AVDD_D1
2. VDD, SVDD, TVDD, VPP, USB_SVDD, USB_SDVDD, TA_BB_VDD, FA_VL
3. GVDD, DDR_VTT, DDR_VREFCA
2.1.4 Current and power measurements
The LS1046ARDB implements onboard current and power measurements only for the VDD supply. The table below provides
details of VDD current/power measurement.
Table 5. VDD current/power measurement
Power supply
Measurement device
Shunt resistor value
VDD
INA220
0.001 Ω
All other power supplies of the board are considered as low-current/incidental supplies and therefore, they are not instrumented
for power measurement.
Power supplies
QorIQ LS1046A Reference Design Board Reference Manual, Rev. 2, 30 May 2019
NXP Semiconductors
19