DS2490 Datasheet, PDF (1/50 Pages) Dallas Semiconductor – USB to 1-Wire Bridge Chip

19-4993; 10/09
www.maxim-ic.com
FEATURES
 Communicates at regular and overdrive 1-
Wire^® speeds
 Supports stiff 5V pullup for EEPROM,
sensors, and crypto iButton^®
 Slew rate controlled 1-Wire timing and active
pullup to accommodate long 1-Wire network
lines and reduce radiation
 Programmable 1-Wire timing and driver
characteristics accommodate a wide range of
1-Wire network configurations
 Low- to high-level command types, including
macros, for generating 1-Wire communication
 Crystal oscillator timebase provides precision
timed 1-Wire waveforms
 High-speed 12Mbps Universal Serial Bus
(USB) interface
 Integrated USB-compliant transceiver
 Supports USB remote wake-up from a 1-Wire
device event to resume a suspended host
system
 0^oC to +70^oC operating temperature range
DS2490
USB to 1-Wire Bridge Chip
PIN ASSIGNMENT
PMOD
1
NC 2
NC 3
NC 4
VB 5
SUSO 6
D- 7
D+ 8
NC
9
1-WIRE ₁₀
NC
11
GND ₁₂
24
VD
23
NC
22 NC
21 NC
20
XO
19
XI
18 NC
17 VD2
16
NC
15 NC
14
NC
13 NC
24-Pin SO
Top View
(300-mil)
ORDERING INFORMATION
PART NUMBER
TEMP
RANGE
PIN-PACKAGE
DS2490S+
0^oC to +70^oC 24 SO (300 mil)
DS2490S+T&R
0^oC to +70^oC 24 SO (300mil)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
DESCRIPTION
The DS2490 is a bridge chip that enables communication between a USB host system and a 1-Wire bus.
It provides regular, overdrive, and flexible 1-Wire communication speeds and a full-speed 12Mbps
connection to USB. USB vendor-specific commands defined in this specification are used to control the
DS2490 and communicate with attached 1-Wire devices. A functional block diagram of the DS2490 is
shown in Figure 1.
1-Wire and iButton are registered trademarks of Maxim Integrated Products, Inc.
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