1 kΩ

DP0

DM0

EEDATA

TUSB2036 USB Hub

(3-Port Configuration)

System

Power-On Reset

Regulator

Power

Switching

OVRCUR1 -

OVRCUR3

PWRON1 -

PWRON3

EECLK

RESET

XTAL1/CLK48

EXTMEM

VCC

GND

DP1 - DP3

DM1 - DM4

GND

Vbus

5 V GND

XTAL2

USB Data lines

and Power to

Downstream

Ports

Bus or Local Power

6-MHz Clock

Signal

4

4

4

4

30

29

4

1

2

6

5

3, 25

7, 28

12, 16, 20

10, 14, 18

11, 15, 19

9, 13, 17

5

8

6

2

4

3

ORG

VCC

VSS

D

Q

C

S

1

EEPROM

3.3 V

26

OCPROT/

PWRSW

21

NP3

24

22

23

NPINT1

NPINT0

MODE

Copyright © 2017, Texas Instruments Incorporated

12

TUSB2036

SLLS372I – MARCH 2000 – REVISED MARCH 2017

www.ti.com

Product Folder Links: TUSB2036

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Copyright © 2000–2017, Texas Instruments Incorporated

8.4 Device Functional Modes

8.4.1 2-3 Programmable Downstream Ports

The hub silicon can accurately reflect the system port configuration by the NP3 and NPINT1-0 pins. When NP3 is

low, the hub is configured as a 3-port hub; when it is high, the hub is configured as a 2-port hub. The NPINT1-0

pins tell the hub silicon how many ports have permanently attached devices, according to Table 1.

Table 1. System Port Configuration

NPINT1-0

PORT AVAILABILITY

HUB DESCRIPTOR

DEVICE REMOVABLE FIELD

(7

−0)

00

All ports are available through external USB connectors

00000000

01

Port 1 has a permanently attached device; ports 2 and 3 are externally available

00000010

10

Ports 1 and 2 have permanently attached devices; port 3 is externally available

00000110

11

All ports have permanently attached devices

NP3 high: 00000110

NP3 low: 00001110

NPINT1-0

COMPOUND DEVICE OR NOT

HUB DESCRIPTOR WITH HUB

CHARACTERISTICS FIELD BIT 2

00

Hub is not part of a compound device

0

01, 10, 11

Hub is part of a compound device

1

8.4.2 Vendor ID and Product ID With External Serial EEPROM

The EXTMEM (pin 26) enables or disables the optional EEPROM interface. When EXTMEM is high, the vendor

and product IDs (VID and PID) use defaults, such that the message displayed during enumeration is General

Purpose USB Hub. For this configuration, pin 6 functions as the GANGED input terminal and the EECLK (pin 5)

is unused. If custom VID and PID descriptors are desired, the EXTMEM must be tied low (EXTMEM = 0) and a

SGS Thompson M93C46 EEPROM, or equivalent, stores the programmable VID, PID, and GANGED values. For

this configuration, pins 5 and 6 function as the EEPROM interface signals with pin 5 as EECLK and pin 6 as

EEDATA, respectively. A block diagram example of how to connect the external EEPROM if a custom product ID

and vendor ID are desired is shown in Figure 6.

Figure 6. TUSB2036 USB Hub With External EEPROM