5.

Pin Function and Description

6

Seiko Epson Corporation

S2R72A4x Series Data Sheet

(Rev.1.20)

5.

Pin Function and Description

GENERAL (applies to S2R72A44/A43/A42)

Pin No.

Name

I/O

RESET

Description

24

XRESET

IN

−

Reset signal

REFERENCE (applies to S2R72A44/A43/A42)

Pin No.

Name

I/O

RESET

Description

44

XI

IN

−

Internal oscillator circuit input (12 MHz)

45

XO

OUT

−

Internal oscillator circuit output (12 MHz)

47

R1

IN

−

Reference voltage setting pin (connect 12 k

Ω±1% between VSS pins)

TEST (applies to S2R72A44/A43/A42)

Pin No.

Name

I/O

RESET

Description

1

TSTEN

IN (PD)

−

Test pin (*): Not used by user

2

ATPGEN

IN (PD)

−

Test pin (*): Not used by user

13

TST0

IN

−

Test pin (*): Not used by user

PD: Using pull-down I/O

*:

Fix as Low or pull down on board.

MODE (applies to S2R72A44/A43/A42)

Pin No.

Name

I/O

RESET

Description

14

MODE0

IN

−

USB Revision setting (*3)

0: USB 2.0 (High-speed compatible hub) 1: USB 1.1 (Full-speed hub)

22

MODE1

IN

−

23

MODE2

IN

−

Down ports’ VBUS setting pin

MODE1: bPwrOn2PwrGood selector setting pin

0: 0 ms, 1: 100 ms

MODE2: Gang/Individual selector pin

0: Gang, 1: Individual

MODE2 MODE1 VBUS Mode

H

H

Individual Mode

LH

Gang Mode

H/L

L

Non-operation mode

36

MODE3

IN

−

37

MODE4

IN

−

Port setting pin

Setting availability

MODE4

MODE3

Ports

A44

A43

A42

0

0

2 ports

✓

✓

✓

0

1

3 ports

✓

✓

-

1

1

4 ports

✓

-

-

1

0

n/a

-

-

-

*3:

Operates at full-speed in USB 1.1 mode, even when connected to a USB 2.0 (high-speed) compatible USB

host.