ST72681

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PIN DESCRIPTION (Cont’d)

Table 3. USB 2.0 Interface

Table 4. USB 2.0 and core Clock System

Pin

Pin Name

Description

12

VDDBL

S

Supply voltage for buffers and deserialisation flip flops (1.8V)

11

VSSBL

S

Ground for buffers and deserialisation flip flops (1.8V)

10

USBDM

I/O USB2 DATA -

9

USBDP

I/O USB2 DATA +

8

VDD3

S

Supply voltage for the FS compliance (3.3V)

7

VDDC

S

Supply voltage for DLL & xor tree (1.8V)

6

VSSC

S

Ground for DLL & XOR tree (1.8V)

5

RREF

I/O Ref. resistor for integrated impedance process adaptation (11.3 kOhms 1% Pull Down)

Pin

Pin Name

Description

4

VSSA

S

Ground for osc & PLL (1.8V)

3

OSCOUT

O

12MHz oscillator output

2

OSCIN

I

12MHz oscillator input

1

VDDA

S

Supply voltage for osc & PLL (1.8V)