DS2490 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS2490

USB to 1-WireTM Bridge Chip

Dallas Semiconductor -> Maxim Integrated 

DS2490

1-Wire Interface Alternate Setting Summary Table 2

Alt Setting

0

EP1

poll interval

10mS

EP2/EP3

max packet size

16 bytes

Alternate Setting Description

Long interrupt polling interval, small packet size for

bulk pipes

1

10mS

64 bytes

Long interrupt polling interval, large packet size for

bulk pipes

2

1mS

16 bytes

Short interrupt polling interval, small packet size

for bulk pipes

3

1mS

64 bytes

Short interrupt polling interval, large packet size for

bulk pipes

Endpoint Feature Summary Table 3

Endpoint Transaction

#

Type

Direction1

0

CONTROL

IN/OUT

1

INTERRUPT

IN

2

BULK

OUT

3

BULK

IN

1. Direction in this table is in reference to the Host

Max. Packet Size

ALT I/F-0..3: 8 bytes

ALT I/F-0..3 32 bytes

ALT I/F-0: 16 bytes

ALT I/F-1: 64 bytes

ALT I/F-2: 16 bytes

ALT I/F-3: 64 bytes

ALT I/F-0: 16 bytes

ALT I/F-1: 64 bytes

ALT I/F-2: 16 bytes

ALT I/F-3: 64 bytes

USB Core Commands Table 4

Standard Device Requests Target Element

SET_ADDRESS

Device

SET_CONFIGURATION Device

GET_CONFIGURATION Device

GET_DESCIPTOR

Device

GET_INTERFACE

Interface 0

SET_INTERFACE

Interface 0

SET_FEATURE

Device

CLEAR_FEATURE

Device

GET_STATUS

Device, Interfaces,

Endpoints 0-3

Range

0x01 - 0xFF

0x00 - 0x01

0x00 - 0x01

Interface 0: 0x00 - 0x03

Interface 0: 0x00 - 0x03

Notes

1

2

3

3

4

4

5, 6

11 of 50

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