AN2787 datasheet(13/37 Pages) STMICROELECTRONICS

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AN2787

I/O interface

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I/O interface

The PM6641 demonstration board has the following test points given in Table 2.

Table 2.

PM6641 demonstration board input/output interface

Test point

Description

VCC (TP5)

+5 V IC supply, positive terminal

LDOIN (TP15)

LDO (VTT) linear regulator input power supply

AUX (TP18)

Auxiliary 3.3 V for pull-up (not required)

AGND (TP6, TP16)

VCC, LDO, VTT and VTTREF common return

VIN (TP7)

Power supply input voltage positive terminal

GND (TP8, TP11, TP13, TP17)

Power supply and switching regulator outputs common return

V1S8 (TP9)

1.8 V (VDDQ) switching regulator output

V1S5 (TP10)

1.5 V switching regulator output

V1S05 (TP12)

1.05 V switching regulator output

VTT (TP14)

LDO (VTT) linear regulator output

VTTREF (TP1)

Voltage reference (VTTREF) buffer output

PG1S8 (TP2)

1.8 V (VDDQ) switching regulator Power Good signal

PG1S5 (TP3)

1.5 V switching regulator Power Good signal

PG1S05 (TP4)

1.05 V switching regulator Power Good signal

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