Rainbow-electronics AT89C5131 Manual do Utilizador descarregar pdf (Página 11)

AT89C5131

4136A–USB–03/03

VREF PWR

3V Voltage Reference

VREF is used to supply the on-chip USB differential drivers.

It is internally connected to the on-chip voltage regulator output of the

standard versions, which must be connected to an external decoupling

capacitor and can be connected to D+ with a 15 kΩ resistor.

It must be provided from outside on the Low Power versions, which have

no internal voltage regulator.

Table 11. Power Signal Description (Continued)

Signal

Name Type Description

Alternate

Function

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 174 175

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