DS9490

5 of 6

ELECTRICAL CHARACTERISTICS

PARAMETER

SPECIFICATION

USB I/F

As defined in Chapter 7 of the USB Specification*

1-Wire I/F

See the DS2490 data sheet**

The DS9490R and DS9490B consume 58mA in USB active mode and 0.5mA in suspend mode*. The

available to an externally powered fixture is 42mA* (100mA to 58mA); however it is recommended that

no more than 25mA be used. An external circuit can detect when the module is in suspend by monitoring

the

SUSO signal on Pin 5 of the RJ11 connector. When this condition is detected, the external circuit

must also go into a low power state. NOTE: The

SUSO pin of the DS2490 is an open drain output and

requires a pullup resistor to create a valid signal. See the DS2490 data sheet for the conditions where

SUSO is active. Revision C of the DS9490R and all revisions of the DS9490R# have SUSO routed to the

RJ11 connector. The availability of

SUSO at the RJ11 connector is not production tested. Therefore,

before relying on

SUSO in an application, first verify the presence of this signal with the particular

adapter.

*Guaranteed by design, not production tested.

**Tested at DS2490 component level.

Figure 8. FUNCTIONAL DIAGRAM

EMI Filter

VBUS

D-

D+

GND

VIN

VOUT

EN

N/C

GND

LP2980IM5-3.3

PMOD

VD

NC

NC

NC

NC

NC

NC

VB

X1

SUSO

X0

D-

NC

D+

VPP

NC

NC

OW

NC

NC

NC

GND

NC

DS2490

C2

1.0uF

EMI Filter

C3

4.7

R2 24

R3 24

R1

1.5K

C1

0.1uF

OW

GND

DS2401

OW

GND

DS9503

USB

Connector

C6

33pF

C5

33pF

X1

12Mhz

L1

L2

C7

33pF

C8

33pF

U1

U2

U3

U4

J2

1

2

1

2

J1

1

2

3

4

1

3

4

5

2

1

5

7

8

12

24

19

20

17

10

1

2

3

4

5

6

Female RJ11

DS9490R

DS9490B

1

2

iButton Socket

J3

6

5

3

1

R7 10