Renesas M38000TL2-FPD Technical Information PDF herunterladen (Seite 9)

( 7 / 14 )

Function

Allows you to choose whether to apply Vcc or an

external power supply to the MCU's pin VREF (43-

pin).

For the M38K09RFS and M38K29RFS, set this

switch to the Vcc side.

Allows you to choose whether to apply an external

power supply to the MCU's pin USBVREF (64-pin).

When the operating voltage of the MCU (Vcc) is

between 4.0 and 5.25 V, set switch SW2 to the NC

side.

When the operating voltage of the MCU (Vcc) is less

than 4.0 V, set switch SW2 to the TP5 side and apply

a voltage (3.0 to 3.6 V) to the TP5 (USBVREF).

Allows you to choose whether to apply an external

power supply or the VBUS of upstream to the VBUS

of USB downstream.

To use an external power supply, set switch SW3 to

the TP6 side and apply 5 V to the TP6 (DPVBUS).

To supply the VBUS of upstream, set switch SW3 to

the UPVBUS side. When the VBUS of upstream is

supplied, the VBUS of upstream is connected to the

VBUS of downstream. Therefore, do not apply a

voltage to the TP6 (DPVBUS).

(6) Set switches SW1 to SW3 according to your application. Table 4.2 describes the functions of the

switches.

Table 4.2 Functions of switches SW1, SW2 and SW3 of the M38K29T-ADF

No.

SW1

SW2

SW3

Name

VREF

USBVREF

DPVBUS_SEL

Factory-setting

Vcc

TP6

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Keine Kommentare

Renesas M38000TL2-FPD Technical Information Seite 9