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User Guide
LTC9101-3 EVALUATION KIT
DAUGHTER CARD INSERTION PRECAUTIONS
When inserting or removing the daughter card into the EVAL-
LTC9101-3-MB-AZ motherboard, verify all supplies and LEDs are
off. Push the card straight down for insertion or pull straight up
for removal to avoid bending the connector pins. Follow the instruc-
tions in the
Quick Start Procedure
MAIN VEE POE SUPPLY
The VEE supply is the main PoE supply connected to the EVAL-
LTC9101-3-MB-AZ motherboard. For proper connection and appro-
priate supply voltage ranges see
Choose a power supply with a limit set higher than the maximum
system power budget. The banana jacks (J8 and J10) are sufficient
for up to 15 A.
ISOLATION
The IEEE 802.3 Ethernet specifications require network segments
(including the analog PoE circuitry) to be electrically isolated from
the chassis ground. The EVAL-LTC9101-3-MB-AZ motherboard
and EVAL-LTC9101-3-AZ daughter card layouts and high voltage
capacitors provide an isolation barrier between Analog and Digital
domains. Transformers provide a galvanic barrier between DGND
and AGND on the EVAL-LTC9101-3-AZ daughter card. By default,
this isolation barrier is bridged by resistors on the motherboard to
allow for evaluation using a single power supply. Remove RISO1
and RISO2, then provide an external 3.3 V supply between V
DGND to evaluate this board as an isolated system.
All RJ45 shields and terminations are connected to the chassis
ground. AGND and V
each connect to the chassis ground with
EE
two pairs of 1 nF, 2 kV capacitors (C6-C9). AGND and V
connect to DGND each with 10 nF, 2 kV capacitors (C32-C33). An
optional 0 Ω resistor can be installed at RISO3 to tie the chassis
ground to DGND. Two series 1206, 5.1 MΩ resistors connect
between AGND and DGND for high voltage capacitance discharge.
See
Figure 5
for diagram of connections between Analog and Dig-
ital domains, as well as chassis ground on the EVAL-LTC9101-3-
MB-AZ motherboard.
The EVAL-LTC9101-3-AZ daughter card is laid out with isolation.
analog.com
for alignment and see
Figure
Quick Start
Procedure.
DD
also
EE
2.
Figure 5. Motherboard Power Supply Connections and Isolation Barriers
LED INDICATORS
The V
LED (D29) and V
EE
present at the respective supplies. Verify these LEDs are off before
inserting or removing the daughter card.
Each port has respective Status and Fault LEDs to indicate different
states. Status is connected to a green LED while Fault is connected
to a yellow LED. For default Port LED behavior see
Supply Overload LED (OVR, LED14) indicates if power has been
denied, revoked, or if the system is near the power budget. Status,
Fault, and Supply Overload LED functions can be modified with a
and
custom configuration package.
EVAL-LTC9101-3
LED (LED13) indicate if a voltage is
DD
Table
Rev. 0 | 7 of 10
2. The
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