Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
General Description
The DS9481R is a USB-to-1-WireM adapter for easy PC
connectivity to 1-Wire devices. The adapter provides an
RJ11 connector with the signals to communicate with all
1-Wire and iButtonM devices that support a 3.3V data I/O
level. Additionally, the adapter provides the support and
signaling to program 1-Wire/iButton EEPROM and one-
time programmable (OTP)/EPROM devices. To provide
a total hardware solution, the DS9481R can readily be
used with the DS9120 socket adapter to create a 1-Wire
PC programmer for 1-Wire slave devices (contact factory
for more information). The equivalent slave hardware
solution for the iButton is the DS1402D-DR8.
Features
S Driver Support for Windows® 7, Windows Vista®,
and Windows XP® Operating Systems
S Enumerates as a Virtual PC COM Port by Use of
the Prolific PL-2303HXD USB-to-UART Bridge IC
S Emulates the DS2480B 1-Wire Line Driving
Functionality
S 1-Wire OTP/EPROM Programming Provided
Without the Need of an External Power Supply
(12V on OW, 7V on PULSE)
S 3.3V Read/Write Operation to 1-Wire/iButton
Devices
S RJ11 Interface for Standard Connectivity
Accessories such as the DS9120 Socket Adapter
S Supports Standard and Overdrive 1-Wire
Communication
S Provides Strong Pullup to 3.3V
S Fully Compliant with USB 2.0 Specification
S Windows XP Certified Logo Drivers
DS9481R USB-to-1-Wire/iButton Adapter
19-5608; Rev 0; 10/10
Ordering Information
+Denotes lead(Pb)-free and RoHS compliant.
Adapter Contents
1-Wire and iButton are registered trademarks of Maxim
Integrated Products, Inc.
Windows, Windows Vista, and Windows XP are registered
trademarks of Microsoft Corp.
QTY DESCRIPTION
1USB-to-1-Wire adapter
Maxim DS9481R-3C7+
1USB Type A-to-USB Mini-Type B cable
Qualtek Electronics Corp. 3021003-03
PART TYPE
DS9481R-3C7+ Adapter
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
2 Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Component List
DESIGNATION QTY DESCRIPTION
C1, C6, C21 3
4.7FF, 16V Y5V ceramic
capacitors (0805)
TDK Corp. C2012Y5V1C475Z
C2, C3 2
2.2FF, 16V Y5V ceramic
capacitors (0805)
Murata GRM21BF51C225ZA01L
C4, C7 2
0.22FF Q10%, 16V X7R ceramic
capacitors (0603)
TDK Corp. C1608X7R1C224K
C5, C15, C22 3
10nF ±5%, 16V X7R
ceramic capacitors (0603)
AVX 06035C103JAT2A
C8, C11-C14,
C20, C23 7
0.1FF, 16V X7R ceramic
capacitors (0603)
KEMET C0603C104K4RACTU
C10 1
10FF, 10V Y5V ceramic
capacitor (0805)
TDK Corp. C2012Y5V1C106Z
C16 0 Do not populate,
470pF ceramic capacitor (0603)
C17 1
1FF, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107B7105KA-T
C19 1
10pF, 16V NP0 ceramic
capacitor (0603)
TDK Corp. C1608C0G1H100D
C9, C24, C25 0Do not populate, capacitors
CN1 1
USB Mini-AB connector,
right-angle, SMD, 5-position
JAE Electronics
DX3R005HN2E700
D1 1 30V, 200mA Schottky diode (SOT23)
Diodes Inc./Zetex BAT54TA
D2 1 15V, 350mA zener diode (SOT23)
Diodes Inc. MMBZ5245B-7-F
D3 1 Orange LED (TSS type) (0603)
Panasonic/SSG LNJ812R83RA
D4 1 Dual CC Schottky diode (SOT23)
Diodes Inc./Zetex BAT54CTA
DESIGNATION QTY DESCRIPTION
FB1, FB2 2220W, 2000mA ferrite chips (0805)
Murata BLM21PG221SN1D
J1 1
6-position, right-angle, PCB-
mounted jack
Tyco 5520425-3
J2 0 Do not populate,
JTAG connector
Q1, Q3 2
130mA, 50V p-channel MOSFETs
(SOT23-3)
Fairchild Semiconductor BSS84
Q2, Q4, Q5, Q7 4
115mA, 60V n-channel MOSFETs
(SOT23)
Diodes, Inc. 2N7002-7-F
Q6 1
3.9A, 20V p-channel MOSFET
(SOT23)
NXP PMV65XP,215
R1, R29 0Do not populate,
resistors
R2, R3, R5 3
27I Q1%, 1/10W SMD resistors
(0603)
Yageo RC0603FR-0727RL
R4, R16, R21 3
1.5kI Q1%, 1/10W SMD
resistors (0603)
Panasonic ECG ERJ-3EKF1501V
R6, R24 2
10kI Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-0710KL
R7, R14, R26 3
1kI Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-071KL
R8, R13, R17,
R20, R27, R30 5
100kI Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-07100KL
R9 1
750I Q5%, 1/10W SMD
resistor (0603)
Yageo RC0603FR-07750RL
R10 1
0I Q1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3GEY0R00V
3Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Component List (continued)
*EP = Exposed pad.
TinyLogic is a registered trademark of Fairchild Semiconductor.
DESIGNATION QTY DESCRIPTION
R11 1
33I Q1%, 0.1W SMD
resistor (0603)
Rohm MCR03EZPFX33R0
R12, R15, R22 3
4.99I Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-074R99L
R18 1
2.2kI Q5%, 1/10W SMD
resistor (0603)
Stackpole Electronics RMCF
1/16 2.2K 1% R
R23 1
51kI Q0.1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERA-3AEB513V
R25 1
11kI Q0.1%, 1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060311K0BEEA
R28 1
10I Q1%, 1/10W SMD
resistor (0603)
Yageo RC0603FR-0710RL
R31 1
32.4kI Q1%, 1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060332K4BEEA
R32 1
30.1kI Q0.1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF3012V
R33 1
50kI Q1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF4992V
RT1 1
0.12A, 30V PTC resettable fuse
(1206)
Bourns MF-NSMF012-2
DESIGNATION QTY DESCRIPTION
SW1 0 Do not populate, switch
U1 1
Low-dropout, 300mA linear
regulator (5 SOT23)
Maxim MAX8887EZK33+T
(Top Mark: ADPZ)
U2 1
12V, 30mA Flash memory
programming supply (8 SO)
Maxim MAX662ACSA+
U3 1
TinyLogicM UHS inverter
(5 SOT23)
Fairchild NC7SZ04M5X
U4 0
Do not populate,
Silicon oscillator (3 SC70)
Maxim MAX7381AXR126-T
U5 1
USB-to-serial bridge controller
(28 SSOP)
Prolific PL-2303HXD SSOP
U6 1
16-bit microcontroller with infrared
module (32 TQFN-EP*)
Maxim MAXQ610A-9410+
U7 1
2-channel ESD protector (6 FDFN)
Maxim MAX13204EALT+
(Top Mark: BV)
U8 1
High-voltage, low-power linear
regulators (5 SOT23)
Maxim MAX1616EUK+
(Top Mark: ABZD)
U9 1 1.8V comparator (5 SOT23)
STMicroelectronics TS3021ILT
— 1 PCB: DS9481R REV A3
4 Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Quick Start
Recommended Equipment
• Maxim DS9481R (included in adapter)
• USB type-A to USB Mini type-B cable (included in
adapter)
• RJ11 cable assembly (not included)
• PC with a Windows 7, Windows Vista, or Windows XP
OS and a spare USB port
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the adapter software. Text in bold and
underlined refers to items from the Windows operating
system.
Procedure
1) Do the following to install the PL-2303HXD Prolific driver:
a) Download either the driver file called PL2303_
Prolific_DriverInstaller_v130.ZIP or the latest
version from http://www.prolific.com.tw/eng/
downloads.asp?ID=31.
b) Open and Run either the file called PL2303_
Prolific_DriverInstaller_v110.EXE or the latest
version.
c) Follow the directions of the Install Wizard until
Finish is reached for the PL-2303 USB-to-serial
driver installation. Close by clicking the Finish
button.
2) Do the following to install the 1-Wire drivers:
a) Go to the 1-Wire Drivers—Getting Started
webpage at www.maximintegrated.com/1-
wiredrivers.
b) Click on the Click to go to Download Page button.
c) From the Choose Operating System drop-down
list, select your OS.
d) From the Select File drop-down list, select 32-bit
or 64-bit 1-Wire drivers for the architecture being
used by your OS.
e) Click the Download button.
f) When prompted by the question Do you want to
run or save this file?, select Run.
g) When you get a security warning that says Do
you want to run the software?, select Run.
h) Read and check the box if you accept the
license agreement and click Install.
i) Click the Finish button to exit the Setup Wizard.
3) The DS9481R USB-to-1-Wire adapter uses both the
Prolific PL-2303HXD and the Maxim MAXQ610 to
emulate a virtual COM-to-1-Wire port on any PC. Find
the enumeration of the virtual COM port by inserting
the DS9481R into a spare USB port on the com-
puter. Determine the COM port by looking in Control
Panel→System→Hardware→Device Manager and
Figure 1. DS9481R USB-to-1-Wire/iButton Adapter and Cable
5Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
expand Ports (COM & LPT). The port is COM2 in the
example shown in Figure 2.
You have now completed the installation of the DS9481R
adapter. Obtain the adapter software and directions
for installation for your 1-Wire/iButton slave device
by contacting Maxim online technical support at
https://support.maximintegrated.com/1-Wire.
Detailed Description of Connectors
RJ11 Pinout
Table 1 and Figure 3 show the RJ11 pinout mounted on
the DS9481R PCB at J1. The RJ11 pin 1 can supply 3.3V
and can be used for auxiliary board power. The GND is
the ground of the 3.3V supply. The signal OW (DATA)
stands for the 1-Wire data bus. The ground return for OW
(DATA) is the signal OWGND. The PULSE signal is to
be used as the VCC power supply for OTP 1-Wire slave
parts. The PULSE signal is typically 3.3V, but also can
provide the needed programming pulse for OTP parts.
The GP signal is reserved for future general-purpose
usage and is functionally not used by the DS9481R.
Mini-USB Pinout
The 5-position Mini-USB type AB connector is mounted
at CN1 of the DS9481R PCB, as shown in Table 2.
Hardware/Firmware Capabilities
The DS9481R uses both the Prolific PL-2303HXD and
the Maxim MAXQ610. The PL-2303HXD is fully compli-
ant with USB 2.0 specification for Windows 7, Windows
Vista, and Windows XP OS and provides a bridge for the
USB-to-UART connection. The MAXQ610 is loaded with
firmware that emulates the functionality of the DS2480B
serial-to-1-Wire line driver at a lower 3.3V operation
voltage. The MAXQ610 functions as a UART-to-1-Wire
bridge and can serve custom application needs with
firmware programmability.
Figure 2. DS9481R COM Port
Figure 3. 1-Wire RJ11 Port
Table 1. 1-Wire RJ11 Pinout Table 2. Mini-USB Type AB USB Pinout
6
LOOKING INTO FEMALE RJ11 CONNECTOR
54321
CONNECTOR PIN SIGNAL NAME
1 3.3V
2 GND
3OW (DATA)
4 OWGND
5 PULSE
6 GP
CONNECTOR PIN SIGNAL NAME
1 5.0V
2 DMCN
3 DPCN
4 NC
5 GND
6-9 GND_EARTH
6 Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Figure 4. DS9481R Adapter Board Schematic
SHT DZ
SHT DZ
Y4
VCC5
GND
3
NC
1
A
2
U3
NC7SZ 04
IN 1
GND2
SHDN3
BP 4
OUT
5
U1
MAX8887EZ K 33+T
VCC5
GND
7
VOUT 6
SHDN
8
C1+
2
C1-
1
C2+
4
C2-
3
U2
MAX662ACSA+
VCC5.0 VCC3.3VCC5.0
GND
PULSE
PGM_EN
SHT DZ
VPP
IN
1OUT 3
FB 4
SHDN
5
U8
MAX1616EUK +
VP P12.0
D4
BAT 54C
GND
GND
TXD
RXD
RESET
PULSE
1-WIRE GND
1-WIRE
1-WIRE DRIVE
1-WIRE SENSE
PGM12V
PGM_EN
GPIO
CL K 12MHz
3.3V PW R
GPIO
GP0
GP1
GP2
GP3
RT SZ
1-WIRE DPUZ
t
RT 1
PT C Fuse MF-NSMF 012-2
TP10
TP5
TP11
D2
MMBZ 5245B
TP13
C16
470pF/0603
21
D3
L ED/0603
TP12
VCC3.3
VCC3.3
VP P12.0 VCC3.3VCC3.3
VCC3.3
5406514-1
GND
GND
3 1
D1
BAT 54
GNDGND
1
2
3
4
5
6
J1
RJ 11
DPCN
DMCN
DMCN
VO3.3
GND
VCC5.0
TXD
RXD
RESET
RT SZ
VO3.3
GND
VO3.3
DPCN
TP2
TP1
TP4
TP3
V+
1
GND
3CL K2
U4
MAX7381AXR126-T
R1
27/0603
VCC5.0
VCC3.3
GND
GND
CL K 12MHz
GP0
GP1
GP2
GP3
SHT DZ
11
22
33
44
55
6
67
788
99
CN1
USB
GND_EARTH
D
S
G
1
2 3
Q2
2N7002
S
D
G
Q1
BSS84
GND
Place C1 clos e to U2-5
Place C9 clos e to U4-1
Place R2 close to U5-28
DO NOT POPULAT E
Place C20 close to U8-1
Keep clock trace short as possible
Do Not Popula te C16
t=1us
PT C Itrip @ 0.29A
Ihold @ 0.12A
R21
1.5k/0603
R9
750/0603
R4
1.5k/0603
R16
1.5k/0603
R2
27/0603
R3
27/0603
R5
27/0603
R6
10K/0603
R24
10K/0603
R7
1K /0603
R14
1K /0603
R18
2.2K/0603
R26
1K /0603
R8
100K/0603
R13
100K/0603
R17
100K/0603
R20
100K/0603
R27
100K/0603
R10
0/0603
R11
33/0603/0.1W
R12
4.99/0603
R15
4.99/0603
R22
4.99/0603
R23
51K+/-0.1%0603
R25
11K +/-0.1%0603
C9
0.1uF/0603/16V
C20
0.1uF/0603/16V
C21
4.7uF/0805/16V
C1
4.7uF/0805/16V
C6
4.7uF/0805/16V
C2
2.2uF/0805/16V
C3
2.2uF/0805/16V
C4
0.22uF/0603/16V
C7
0.22uF/0603/16V
C8
0.1uF/0603/16V
C11
0.1uF/0603/16V
C12
0.1uF/0603/16V
C13
0.1uF/0603/16V
C22
10nF/0603/16V
C14
0.1uF/0603/16V
C15
10nF/0603/16V
C19
10pF/0603/16V
C10
10uF/0805/10V
C17
1uF/0603
FB1
BL M21PG 221SN1D
FB2
BL M21PG 221SN1D
C5
10nF/0603/16V
R28
10/0603
S
D
G
Q3
BSS84
S
D
G
Q6
PMV65XP
D
S
G
1
2 3
Q5
2N7002
D
S
G
1
23
Q4
2N7002
D
S
G
1
2 3
Q7
2N7002
TDO
TMS
TDI
TCK
PGM_9VZ
1 2
3 4
5 6
7 8
9 10
J2
JTAG CONNECTOR
TDO
TDI
TMS
TCKGND
RESET _IN
RESET _IN
GND
VCC5.0VCC3.3
R29
0/0603
SW1
RESET
GND
GND
RIZ
TXD
1
DTR_N
2
RTS_N
3
VDD_325
4
RXD
5
RI _N
6
GND
7
NC
8
DSR_N
9
DCD_N
10
CTS_N
11
SHTD_N
12
GP3
13
GP2
14 DP 15
DM 16
VO_33 17
GND 18
RESET_N 19
VDD_5 20
NC 21
GP022
GP123
NC 24
GND 25
TEST 26
NC 27
RESERVED 28
U5
PL-2303HXD
GND
Do Not Popula te
GND
VCC
1
IO1
2
IO2
3IO34
IO45
GND6
U7
MAX13204EALT+
1. TIE U6.19 TO GROUND from Rev A1 to A2
DESIGN NOTES:
OUT 1
IN+
3
IN-
4
V -
2V+ 5
U9
TS3021
GND
VCC3.3
1-WIRE SENSE
EDG E_DET
R30
100K /0603
R31
32.4K /0603/1%
C23
0.1uF/0603/16V
R32
30.1K +/-0.1%0603
R33
50K/0603
VCC3.3
EDG E_DET
PGM_9VZ
0.1uF/0603/16v
1Meg/0603
2. Rev A2 - 9 volt program conguration R26 = 1Meg/0603
3. Rev A2 - 9 volt program conguration C22 = 0.1uF/0603/16v
/1%
R9A
DNP
4. Rev A3 - Flipped the nets on D4 so that a standard BAT54 can be used in alternate congurations
5. Rev A3 - Added a 1206 footprint in parallel to R9 for ease of soldering in new values
6. Rev A3 - Added miller cap to the gate of Q5 & Q7
7. Rev A3 - Changed footprint of U6 to a TQFN package
8. Rev A3 - Changed the footprint of RT1 to 1206 and part number cut costs on materials
NOCON23
P0.0/IRTXM
1
P0.1/RX0
2
P0.2/TX0
3
P0.3/RX1
4
P0.4/TX1
5
P0.5/TBA0/TBA1
6
P0.6/TBB0
7
P0.7/TBB1
8
P1.0/INT09
P1.1/INT110
P1.2/INT211
P1.3/INT312
VDD15
P1.4/INT416
P1.5/INT517
P1.6/INT620
GND
13
P1.7/INT721
GND
22
P2.4/TCK24
P2.5/TDI25
P2.6/TMS 26
P2.7/TDO 27
RESET
28
IRTX 31
IRRX 32
HF XI N
18
HF XOUT
19
VDD29
GND
30
REGOUT
14
EP
E P
U6
MAXQ610 TQF N32
C24
DNP
C25
DNP
9. Rev A3 - Component values inBLUE are for regular builds. Values in GREEN are for DS28E500 builds
BAT 54
1.5k/0603
7Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Figure 5. DS9481R Adapter Enclosure Dimensions
8 Maxim Integrated
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Figure 6. DS9481R Adapter Board—Composite Layout
Evaluates: 1-Wire Slave and iButton Devices
DS9481R USB-to-1-Wire/iButton Adapter
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 9
© 2010 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/10 Initial release —
