User Manual

1-Aug-2012
30
The table below shows the minimum required voltage rails, currents, and tolerances.
Table 19 - TPS65708 Connections
Voltage (V)
Current (A)
Tolerance
1.0 (Vccint)
1.3
5.00%
1.5 (Vccoddr)
1.5
5.00%
1.8 (Vccaux)
0.8
5.00%
1.8, 2.5, 3.3
(jumper adjustable, 2.5V
default) (Vadj)
2
5.00%
3.3 (Vcco/FMC/Pmod)
3
5.00%
1.8 (analog) (Vccadc)
0.15
5.00%
1.25 reference (Vrefp)
0.005
0.2%, 50ppm/ºC
0.75 (DDR3 Vtt)
1.5
5.00%
5.0 (Filtered for XADC)
0.15
5.00%
2.11.4 Sequencing
Sequencing for the power supplies follows the recommendations for the Zynq device. PS and PL
INT and AUX supplies are tied together on the ZedBoard platform to create a low cost design.
The following diagram illustrates the supply sequencing:
5V
1V Vccint
1.8V XADC
1.8V Vccaux
3.3V Vcco
Vadj (1.8/2.5/3.3)
1.5V Vccoddr
0.75V Vtt
1.25V Vref
Figure 18 - Power Sequencing
In addition to the sequencing, a power on reset circuit is used to hold the board in reset until all
power supplies have reached their regulation point.