Maxim Integrated DS9481R User Manual

DS9481R USB-to-1-Wire/iButton Adapter

Evaluates: 1-Wire Slave and iButton Devices

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

M

1-Wire and iButton
level. Additionally, the adapter provides the support and
signaling to program 1-Wire/iButton EEPROM and one­time 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.

devices that support a 3.3V data I/O

Adapter Contents

QTY DESCRIPTION

USB-to-1-Wire adapter

1

Maxim DS9481R-3C7+

USB Type A-to-USB Mini-Type B cable

1

Qualtek Electronics Corp. 3021003-03

Features

S Driver Support for Windows® 7, Windows Vista®,

and Windows XP

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

®

Operating Systems

Ordering Information

PART TYPE

DS9481R-3C7+ Adapter

+Denotes lead(Pb)-free and RoHS compliant.

DS9481R USB-to-1-Wire/iButton Adapter

1-Wire and iButton are registered trademarks of Maxim
Integrated Products, Inc.
Windows, Windows Vista, and Windows XP are registered
trademarks of Microsoft Corp.

For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-5608; Rev 0; 10/10

DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices

Component List

DESIGNATION QTY DESCRIPTION

4.7FF, 16V Y5V ceramic

C1, C6, C21 3

C2, C3 2

C4, C7 2

C5, C15, C22 3

C8, C11-C14,

C20, C23

C10 1

C16 0

C17 1

C19 1

C9, C24, C25 0 Do not populate, capacitors

CN1 1

D1 1

D2 1

D3 1

D4 1

capacitors (0805)
TDK Corp. C2012Y5V1C475Z

2.2FF, 16V Y5V ceramic
capacitors (0805)
Murata GRM21BF51C225ZA01L

0.22FF Q10%, 16V X7R ceramic
capacitors (0603)
TDK Corp. C1608X7R1C224K

10nF ±5%, 16V X7R
ceramic capacitors (0603)
AVX 06035C103JAT2A

0.1FF, 16V X7R ceramic

7

capacitors (0603)
KEMET C0603C104K4RACTU

10FF, 10V Y5V ceramic
capacitor (0805)
TDK Corp. C2012Y5V1C106Z

Do not populate,
470pF ceramic capacitor (0603)

1FF, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107B7105KA-T

10pF, 16V NP0 ceramic
capacitor (0603)
TDK Corp. C1608C0G1H100D

USB Mini-AB connector,
right-angle, SMD, 5-position
JAE Electronics
DX3R005HN2E700

30V, 200mA Schottky diode (SOT23)
Diodes Inc./Zetex BAT54TA

15V, 350mA zener diode (SOT23)
Diodes Inc. MMBZ5245B-7-F

Orange LED (TSS type) (0603)
Panasonic/SSG LNJ812R83RA

Dual CC Schottky diode (SOT23)
Diodes Inc./Zetex BAT54CTA

DESIGNATION QTY DESCRIPTION

FB1, FB2 2

J1 1

J2 0

Q1, Q3 2

Q2, Q4, Q5, Q7 4

Q6 1

R1, R29 0

R2, R3, R5 3

R4, R16, R21 3

R6, R24 2

R7, R14, R26 3

R8, R13, R17,

R20, R27, R30

R9 1

R10 1

220W, 2000mA ferrite chips (0805)
Murata BLM21PG221SN1D

6-position, right-angle, PCB­mounted jack
Tyco 5520425-3

Do not populate,
JTAG connector

130mA, 50V p-channel MOSFETs
(SOT23-3)
Fairchild Semiconductor BSS84

115mA, 60V n-channel MOSFETs
(SOT23)
Diodes, Inc. 2N7002-7-F

3.9A, 20V p-channel MOSFET
(SOT23)
NXP PMV65XP,215

Do not populate,
resistors

27I Q1%, 1/10W SMD resistors
(0603)
Yageo RC0603FR-0727RL

1.5kI Q1%, 1/10W SMD
resistors (0603)
Panasonic ECG ERJ-3EKF1501V

10kI Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-0710KL

1kI Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-071KL

100kI Q1%, 1/10W SMD

5

resistors (0603)
Yageo RC0603FR-07100KL

750I Q5%, 1/10W SMD
resistor (0603)
Yageo RC0603FR-07750RL

0I Q1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3GEY0R00V

2 Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter

Evaluates: 1-Wire Slave and iButton Devices

Component List (continued)

DESIGNATION QTY DESCRIPTION

33I Q1%, 0.1W SMD

R11 1

R12, R15, R22 3

R18 1

R23 1

R25 1

R28 1

R31 1

R32 1

R33 1

RT1 1

resistor (0603)
Rohm MCR03EZPFX33R0

4.99I Q1%, 1/10W SMD
resistors (0603)
Yageo RC0603FR-074R99L

2.2kI Q5%, 1/10W SMD
resistor (0603)
Stackpole Electronics RMCF
1/16 2.2K 1% R

51kI Q0.1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERA-3AEB513V

11kI Q0.1%, 1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060311K0BEEA

10I Q1%, 1/10W SMD
resistor (0603)
Yageo RC0603FR-0710RL

32.4kI Q1%, 1/10W SMD
resistor (0603)
Vishay/Dale
TNPW060332K4BEEA

30.1kI Q0.1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF3012V

50kI Q1%, 1/10W SMD
resistor (0603)
Panasonic ECG ERJ-3EKF4992V

0.12A, 30V PTC resettable fuse
(1206)
Bourns MF-NSMF012-2

DESIGNATION QTY DESCRIPTION

SW1 0 Do not populate, switch

Low-dropout, 300mA linear

U1 1

U2 1

U3 1

U4 0

U5 1

U6 1

U7 1

U8 1

U9 1

— 1 PCB: DS9481R REV A3

*EP = Exposed pad.

TinyLogic is a registered trademark of Fairchild Semiconductor.

regulator (5 SOT23)
Maxim MAX8887EZK33+T
(Top Mark: ADPZ)

12V, 30mA Flash memory
programming supply (8 SO)
Maxim MAX662ACSA+

M

TinyLogic
(5 SOT23)
Fairchild NC7SZ04M5X

Do not populate,
Silicon oscillator (3 SC70)
Maxim MAX7381AXR126-T

USB-to-serial bridge controller
(28 SSOP)
Prolific PL-2303HXD SSOP

16-bit microcontroller with infrared
module (32 TQFN-EP*)
Maxim MAXQ610A-9410+

2-channel ESD protector (6 FDFN)
Maxim MAX13204EALT+
(Top Mark: BV)

High-voltage, low-power linear
regulators (5 SOT23)
Maxim MAX1616EUK+
(Top Mark: ABZD)

1.8V comparator (5 SOT23)
STMicroelectronics TS3021ILT

UHS inverter

3Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices

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 com­puter. 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

4 Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter

Evaluates: 1-Wire Slave and iButton Devices

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

Figure 2. DS9481R COM Port

6

54321

LOOKING INTO FEMALE RJ11 CONNECTOR

Figure 3. 1-Wire RJ11 Port

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 compli­ant 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.

Table 1. 1-Wire RJ11 Pinout

CONNECTOR PIN SIGNAL NAME

1 3.3V
2 GND
3 OW (DATA)
4 OWGND
5 PULSE
6 GP

Table 2. Mini-USB Type AB USB Pinout

CONNECTOR PIN SIGNAL NAME

1 5.0V
2 DMCN
3 DPCN
4 NC
5 GND

6-9 GND_EARTH

5Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices

100K/0603

VO_33

C25

IO34IO4

3

C16

Q5

D

MAXQ610 TQF N32

LED/0603

16

DM

GP3

R15

470pF/0603

2N7002

G

1

DNP

R20

EP

DMCN

15

DP

14

GP2

MAX13204EALT+

4.99/0603

Do Not Populate C16

2 3

S

C19

10pF/0603/16V

100K/0603

DPCN

R3

27/0603R527/0603

GND

8. Rev A3 - Changed the footprint of RT1 to 1206 and part number cut costs on materials

7. Rev A3 - Changed footprint of U6 to a TQFN package

6. Rev A3 - Added miller cap to the gate of Q5 & Q7

DESIGN NOTES:

5. Rev A3 - Added a 1206 footprint in parallel to R9 for ease of soldering in new values

1. TIE U6.19 TO GROUND from Rev A1 to A2

2. Rev A2 - 9 volt program conguration R26 = 1Meg/0603

4. Rev A3 - Flipped the nets on D4 so that a standard BAT54 can be used in alternate congurations

9. Rev A3 - Component values inBLUE are for regular builds. Values in GREEN are for DS28E500 builds

3. Rev A2 - 9 volt program conguration C22 = 0.1uF/0603/16v

GND

SW1

RESET

VCC5.0VCC3.3

R29

0/0603

Do Not Populate

RESET _IN

GND

1 2

3 4

5 6

7 8

9 10

J2

JTAG CONNECTOR

TDO

TDI

TMS

TCKGND

EDGE_DET

1

U9

TS3021

C23

0.1uF/0603/16V

OUT

V-2V+

5

IN+3IN-

4

2

GND

R4

1.5k/0603

PL-2303HXD

VCC3.3

/1%

1-WIRE SENSE

R30

100K/0603

C10

10uF/0805/10V

VCC5.0

FB1

BL M21PG221SN1D

FB2

DPCN

DMCN

5

112233445

9

9

8

8

CN1

USB

6
7

BL M21PG221SN1D

GND

R31

32.4K/0603/1%

GND

R28

10/0603

6
7

GND_EARTH

6

5

VCC3.3

PULSE

1-WIRE GND

1-WIRE

TP13

R12

TP12

R33

50K/0603

VCC3.3

GND GND

VCC3.3

TDO

TMS

27

32

26

IRTX

IRRX

P2.6/TMS

P2.7/TDO

RESET

28

GND

RESET _IN

3

GND

5406514-1

RJ11

6

R21

1.5k/0603

R22

4.99/0603

GPIO

D2

MMBZ 5245B

4.99/0603

D1

1.5k/0603

R9

750/0603

VCC3.3

Q3

BSS84

R9A

DNP

D

S

G

R11

33/0603/0.1W

R14

1K/0603

R13

100K/0603

TP10

TP11

PGM12V

PGM_EN

GPIO

TDI

25

RTSZ

D

Place R2 close to U5-28

1-WIRE DPUZ

TCK

PGM_9VZ

EDGE_DET

12

20

21

24

P2.5/TDI

P2.4/TCK

P1.4/INT416P1.5/INT517P1.6/INT6

P1.7/INT7

P0.0/IRTXM1P0.1/RX02P0.2/TX03P0.3/RX14P0.4/TX15P0.5/TBA0/TBA16P0.6/TBB07P0.7/TBB1

8

TXD

RXD

GP0

GP1

GP2

GP3

C17

Q4

2N7002

R16

1.5k/0603

2

S

G

1

RESET

C11

0.1uF/0603/16V

R2

27/0603

GND

GP0

GP1

23

25

26

28

24

27

NC

NC

GND

TEST

GP022GP1

RESERVED

TXD1DTR_N2RTS_N3VDD_3254RXD5RI _N6GND7NC8DSR_N9DCD_N10CTS_N11SHTD_N12GP313GP2

U5

RIZ

GND

TXD

RXD

RESET

RTSZ

VO3.3

3 1

1-WIRE SENSE

14

1uF/0603

21

NC

GND

VCC1IO12IO2

U7

BAT 54

R18

2.2K/0603

R17

1-WIRE DRIVE

23

NOCON

P1.0/INT09P1.1/INT110P1.2/INT211P1.3/INT3

EP

GND

GND

GND30REGOUT

13

22

D3

1

GND

C12

0.1uF/0603/16V

VO3.3

VCC5.0

GND

VO3.3

19

18

17

20

GND

VDD_5

RESET_N

SHTDZ

J1

C2

C5

SHTDZ

4

3

2

1

IN

BP

GND

SHDN

OUT

U1

5

GND

2.2uF/0805/16V

10nF/0603/16V

PTC Itrip @ 0.29A

MAX8887EZ K33+T

VPP12.0 VCC3.3VCC3.3

C3

2.2uF/0805/16V

PULSE

R27

BAT 54C

BAT 54

VPP

D

G

D

C24

DNP

R26

1Meg/0603

1K/0603

GND

FB

PGM_9VZ

SHDN

MAX1616EUK +

VOUT

VCC

C1+2C1-1C2+4C2-

3

C4

0.22uF/0603/16VC70.22uF/0603/16V

5

4

Y

VCC

GND3NC1A

U3

2

SHTDZ

Q7

G

1

PGM_EN

R32

2N7002

2 3

S

t=1us

C22

R25

30.1K+/-0.1%0603

C20

0.1uF/0603/16V

C6

4.7uF/0805/16V

GND

SHDN

8

NC7SZ 04

100K/0603

10nF/0603/16V

0.1uF/0603/16v

11K+/-0.1%0603

Place C20 close to U8-1

7

MAX662ACSA+

C13

0.1uF/0603/16V

C14

0.1uF/0603/16V

GND

D4

S

Q6

PMV65XP

R24

10K/0603

C21

4.7uF/0805/16V

R23

51K+/-0.1%0603

4

3

OUT

IN

U8

1

5

SHTDZ

VPP 12.0

6

5

U2

C1

4.7uF/0805/16V

Place C1 close to U2-5

C8

0.1uF/0603/16V

VCC5.0 VCC3.3 VCC5.0

12345

RT1

PTC Fuse MF-NSMF 012-2

3.3V PW R

t

R10

0/0603

Ihold @ 0.12A

Q1

BSS84

D

S

G

R6

10K/0603

Q2

2N7002

2 3

D

S

G

1

C15

10nF/0603/16V

R7

1K/0603

R8

100K/0603

15

29

31

VDD

VDD

GND

HFXI N18HFXOUT

U6

19

TP5

CLK 12MHz

Keep clock trace short as possible

CLK 12MHz

R1

27/0603

2

CL K

V+1GND

U4

MAX7381AXR126-T

3

DO NOT POPUL AT E

C9

0.1uF/0603/16V

Place C9 close to U4-1

VCC3.3

Figure 4. DS9481R Adapter Board Schematic

6 Maxim Integrated

TP2

TP1

TP4

TP3

DS9481R USB-to-1-Wire/iButton Adapter

Evaluates: 1-Wire Slave and iButton Devices

Figure 5. DS9481R Adapter Enclosure Dimensions

7Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter
Evaluates: 1-Wire Slave and iButton Devices

Figure 6. DS9481R Adapter Board—Composite Layout

8 Maxim Integrated

DS9481R USB-to-1-Wire/iButton Adapter

Evaluates: 1-Wire Slave and iButton Devices

Revision History

REVISION

NUMBER

0 10/10 Initial release —

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

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.