• Mini-PCIe (1.5 V, 3.3 V and PA for QCA card) - The +1.5 V rail is used by the
mini-PCIe slot and is sourced by VR500, rail name is VR500_1V5. The Mini-PCIe 1
(P2) 3.3 V is sourced from regulator LT8612(U29), DCDC2_3V3. The Mini-PCIe
2(P3) 3.3 V is sourced from another regulator LT8612 (U28). Each PA card is
sourced from a LT8612(U45 and U49) regulator. Each type of card has different PA
voltage. Hence, each DCDC can be adjusted to the four kind of output voltages, that
is 3.3 V,3.5 V, 4.5 V,and 5 V. For more details, see
• AQR105 (0.85 V, 1.2 V, 2.1 V, 2.5 V) - 0.85 V is sourced from part LTC3605A, rail
is DCDC_V85; 1.2 V is sourced from part LT3021, rail is LDO_1V2; 2.1 V is
sourced from another LT3021 part, rail is LDO_2V1; 2.5 V is sourced from the
VR500_2V5 rail.
The following figure shows the board power structure and the current consumption. All
the values marked are the maximum values from the datasheet and are only for reference.
Figure 2-1. Power block
2.3 Reset
All resets on the board are handled by the reset switch SW4. Power-on Reset is initiated
by pressing the switch SW4. Software is also capable of initiating a reset by asserting the
RESET_REQ
line from the processor.
Chapter 2 Architecture
QorIQ T1023 Reference Design Board User Guide, Rev. 0, 08/2015
Freescale Semiconductor, Inc.
13
Summary of Contents for QorIQ T1023
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