PI 2 Design PI2AES-LITE, Hardware Reference Manual

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Pi 2 Design – PI2AES-LITE Hardware Reference Manual – P0.1 - 5/23/2022
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6
6 6
6 PI2AES
PI2AES PI2AES
PI2AES----LITE
LITE LITE
LITE POWER
POWER POWER
POWER
6.1 OVERVIEW
The PI2AES-LITE is designed to be powered the Raspberry PI +5V Pins. Optionally,
external 5V can be used, such as Linear Power Supplies. When jumper W2 is removed,
separate 5V power must be supplied to the Raspberry PI. Note that when the PI2AES-
LITE and the PI are powered separately, the PI2AES-LITE
must be powered first for
proper operation.
Note that an on-board protection circuit ensures proper operation when jumper W2 is
installed while power is applied via J1 AND from the PI (P1) simultaneously. In this
instance, whichever voltage rail is higher supplies the power.
See the below block diagram for a simplified view of the PI2AES-LITE power.
J1
2.5MM JACK
RESETABLE
POLY FUSE
OPTIONAL
+5V INPUT
58V
OVER PROTECTION
LT3042, 3.3V
LOW NOISE LDO
LT3042, 3.3V
LOW NOISE LDO
+3.3V to Digital Logic
+3.3V to NDK CLOCKS
BIDIRECTIONAL
POWER
PROTECTION
RASPBERRY PI
40-PIN HDR
5V PINS
W2
PI2AES-LITE POWER FLOW
SIMPLIFIED BLOCK DIAGRAM
Figure 2 – PI2AES-LITE Power, Simplified Block Diagram