USB3503 datasheet(47/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

Figure 6.3 shows the format of the read operation. Where color is visible in the figure, blue and gold

indicate signaling from the I2C master, and gray indicates signaling from the USB3503 slave.

6.3.3

I2C Timing

Below is the timing diagram and timing specifications for the different I2C modes that the USB3503

supports.

Figure 6.3 Sequential Access Read Format

Figure 6.4 I2C Timing Diagram

Table 6.1 I2C Timing Specifications

SYMBOL

PARAMETER

STANDARD-MODE

FAST-MODE

FAST-MODE PLUS

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

fSCL

SCL clock

frequency

100

400

1000

KHz

tHD;STA

Hold time

START condition

0.6

0.26

μs

7 - B i t S l a v e

A ddr es s

xx xx xx xx

Re g i s t e r

A d dr es s

( b i t s

7- 0)

O p t i ona l . I f pr es ent , N e x t

ac c e s s

m u s t hav e

S t ar t ( S ) ,

o t he r w i s e

R epe at S t a r t ( S r )

7- B i t S l av e A ddr es s

n n n n n n n n

AC K

R egi s t er v a l ue

f o r xx xxx xxx

n n n n n n n n

AC K

R egi s t er v a l u e

f o r xx xxx xxx + 1

...

n n n n n n n n

NA C K

I f pr ev i ous w r i t e s e t t i ng up

R e g i s t er addr es s end ed w i t h a

S t o p ( P ) , o t h e r w i s e it w ill b e

R e p eat ed S t a r t ( S r )

R egi s t er v a l ue

f o r xxx xxx xx + y

tHD;STA

tSU;STO

tSU;STA

tSU;DAT

tHIGH

tLOW

tHD;DAT

tHD;STA

tBUF

AB_DATA

AB_CLK

I2C_CLK

I2C_DATA

USB3503 Datasheet(PDF) 47 Page - SMSC Corporation

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