TPS2074, TPS2075

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

3

POST OFFICE BOX 655303

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

PG_DLY†

1

Adjusts the PG time delay with a capacitor to ground. Adjust the pulse width to fit the application.

EN1

2

I

Active-low enable for OUT1

AGND

3

Analog ground

PG

4

O

Logic output, power good

SP

5

I

Self-power voltage input, connects to local power supply

SP

6

I

Self-power voltage input, connects to local power supply

NC

7

No internal connection

3.3V_OUT

8

O

3.3-V internal voltage regulator output

BPMODE‡

9

O

A logic signal that indicates if the outputs source from the bus-powered supply, BPMODE (TPS2074) or BPMODE

(TPS2075), can be used to signal the hub controller.

DP0_RST

10

O

Connects to DP signal from upstream hub/host through an external 1.5-k

Ω resistor

EN2

11

I

Active-low enable for OUT2

DGND

12

Digital ground

EN3

13

I

Active-low enable for OUT3

EN4

14

I

Active-low enable for OUT4

OC1

15

O

Logic output, overcurrent response for OUT1

OC2

16

O

Logic output, overcurrent response for OUT2

OC3

17

O

Logic output, overcurrent response for OUT3

OC4

18

O

Logic output, overcurrent response for OUT4

OUT4

19

O

Power switch output for downstream ports

OUT3

20

O

Power switch output for downstream ports

OUT2

21

O

Power switch output for downstream ports

OUT1

22

O

Power switch output for downstream ports

BP

23

I

Bus power voltage input, connect to VBUS

BP_DIS

24

I

Active-high logic input, disables autoswitch to bus power when self power is disconnected. Connect to BP or GND

† Use the following formula to calculate the capacitance needed;

C = (desired pulse width

× 3 × 10–6 / 1.22

‡ Pin 9 is active low for TPS2074 and active high for TPS2075.