Datasheet
6 EVM Feature Details
6.1 Test Points
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EVM Feature Details
The TPS2458EVM contains numerous test points throughout the circuit for user monitoring of waveforms
and voltage measurement. Table 6 lists the module test points and the signal available at each one. The
EVM PCB layout connects all ground nodes and supply returns to a common GND node, via several
power plane areas. However, due to potentially high loading conditions on the two Payload Power outputs,
multiple ground test points are provided to mitigate the measurement impact of return current drops.
Therefore, where appropriate, certain test points are paired in the table with the pertinent reference point
for meter return connections
Table 6. Module Test Points
TEST POINT
REF. POINT SIGNAL NAME DESCRIPTION
NAME
TP1 12VIN Input 12 V supply for AdvancedMC™Slot A
TP3
TP2 3V3IN Input 3.3 V supply for AdvancedMC™ Slot A
TP4 SLOT_PWR AdvancedMC™ Payload Power, 12 V output
TP6
TP5 SLOT_MP AdvancedMC™ Management Power, 3.3 V output
TP7 EN3 Active-low enable input to TPS2458 for the 3.3 V rail
TP8 TP27 EN12 Active-low enable input to the TPS2458 for the 12-V rail
TP9 OREN Channel A OR’ing FET/function enable signal to the TPS2458
TP10 TP11 12-V load current sense voltage
TP12 PASS TPS2458 pass FET gate drive output
TP14
TP13 BLK TPS2458 block/OR’ing FET gate drive output
TP16 FLT12 Slot A 12-V open-drain, active-low FAULT output indication
TP15
TP17 PG12 Slot A 12-V open-drain, active-low POWERGOOD output indication
TP24
TP18 FLT3 Slot A 3.3-V open-drain, active-low FAULT output indication
TP27
TP19 PG3 Slot A 3.3-V open-drain, active-low POWERGOOD output indication
TP20 CT3 Timing cap waveform for the 3.3-V rail (SLOT_MP)
TP14
TP21 CT12 Timing cap waveform for the 12-V rail (SLOT_PWR)
TP22 SUM12OUT Expansion current summing output 12.0 V
TP15
TP23 SUM3OUT Expansion current summing output 3.3 V
TP24
TP25 SUM12IN Expansion current summing input 12.0 V
TP27
TP26 SUM3IN Expansion current summing input 3.3 V
On the TPS2458EVM, the device fault ( FLTx) and power good ( PGx) outputs are all used to drive the
STATUS LED’s. Power for LED drive is derived from the 3.3-V input supply.
SLUU348A – February 2009 – Revised August 2009 TPS2458 ATCA™ AdvancedMC™ Controller 7
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