DS3900H2
General Description
The DS3900H2 evaluation kit (EV kit) component provides
bidirectional communication with I2C- and SPI-compatible
devices using a PC’s USB port. In addition, the EV kit can
also be used as a general-purpose digital I/O interface
with 11 I/O signals that can evaluate a variety of ICs.
The DS3900H2 IC is a small form-factor module that
requires appropriate headers to pass communication
signals to the device under test. The IC is intended
to interface with approved HID-compliant PC software
designed by Maxim Integrated. The IC is intended for
evaluation purposes only.
Ev Kit Contents
● Assembled DS3900H2 Circuit Board
● Mini-USB Cable
USB HID Communications Module for
Evaluation Kits
Features
● Communicates from PCs to ICs Through a USB Port
Using the Human Interface Device (HID) Class
● Fast Communication to I2C- and SPI-Compatible
Devices
● 11 Total General-Purpose Digital I/O Pins, Including
All Communication Protocol Pins
● Built-In Pullup Resistors for SDA and SCL Minimize
Required External Hardware
● Connection to Standard Prototyping Boards Possible
Using Header Connectors
● Operates from +2.5V to +5.5V
● USB HID Interface for Windows XP®-, Windows
Vista®-, and Windows® 7-Compatible Software
● RoHS Compliant
● Fully Assembled and Tested Proven PCB Layout
Ordering Information appears at end of data sheet.
DS3900H2 EV Kit Photo
Windows, Windows XP, and Windows Vista are registered
trademarks and registered service marks of Microsoft
Corporation.
19-6733; Rev 0; 6/13
DS3900H2
USB HID Communications Module for
Evaluation Kits
Component List
DESIGNATION
QTY
DESCRIPTION
C1, C6,
C7, C13
4
1.0µF ceramic capacitors (0603)
TDK CGJ3E2X7R0J105K
R1, R2
2
25Ω ±1% resistors (0603)
Vishay CRCW060324R9FKEA
C2, C5,
C15
3
4.7µF ceramic capacitors (0603)
TDK C1608X5R0J475K
R3, R8,
R9
3
330Ω ±1% resistors (0603)
Vishay CRCW0603330RFKEA
C3, C8, C10,
C11, C14, C16
6
0.1µF ceramic capacitors (0603)
TDK C1608X7R1E104K
R4, R5
2
10kΩ ±1% resistors (0603)
Vishay CRCW060310K0FKEA
C4, C9
2
0.01µF ceramic capacitors
(0603)
TDK CGJ3E2X7R1C103K
R6
1
100kΩ ±1% resistor (0603)
Vishay CRCW0603100KFKEA
R7, R11,
R12
3
1
220nF ceramic capacitor (0603)
TDK C1608X7R1A224K
4.7 kΩ ±1% resistors (0603)
Vishay CRCW06034K70FKEA
R10
1
D1
1
Red LED (1206)
Kingbright APTR3216EC
2.2kΩ ±1% resistor (0603)
Vishay CRCW06032K20FKEA
U1
1
Microchip PIC18LF2550-I/SO
D2
1
Red/green dual LEDs
Kingbright APHB
M2012SURKCGKC
U2
1
FXMA108
Fairchild FXMA108BQX
U3
1
1
Schottky diode
ROHM Semi RB060M-30TR
USB transceiver (16 TSSOP)
Maxim MAX3344EEUE+
U4
1
J1
1
5-pin Mini-USB female connector
Molex 54819-0519
Linear regulator (5 SOT23)
Maxim MAX8868EUK33+
J2
0
Do not populate, 2-pin header
U5
1
Current-limit switch (5 SOT70)
Maxim MAX4787EXK+
J3, J4
2
Create a solder bridge across
the two pads
U6
2
16-pin (2 x 8) header (HDR2X8)
Sullins PPTC082LFBN-RC
Q1
0
Do not populate, n-channel
MOSFET
ON Semi NTS4001NT1G
X1
1
4-pin CMOS oscillator
AVX KC3225A48.0000C30E00
C12
D3
DESIGNATION
QTY
DESCRIPTION
Component Suppliers
SUPPLIER
PHONE
WEBSITE
AVX North America
864-967-2150
www.avx.com
Fairchild Semiconductor
888-522-5372
www.fairchildsemi.com
Kingbright Corporation
909-468-0500
www.kingbrightusa.com
Molex
800-786-6539
www.molex.com
ON Semiconductor
602-244-6600
www.onsemi.com
ROHM Co., Ltd.
858-625-3630
www.rohm.com
Sullins Electronics Corp.
760-744-0125
www.sullinselectronics.com
TDK Corp.
847-803-6100
www.component.tdk.com
Vishay
402-563-6866
www.vishay.com
Note: Indicate that you are using the DS3900H2 when contacting these component suppliers.
www.maximintegrated.com
Maxim Integrated │ 2
DS3900H2
USB HID Communications Module for
Evaluation Kits
Quick Start
by using its full-speed-compatible USB serial interface
engine. The USB interface of the IC hardware is configured as an HID device and therefore does not require a
unique/custom device driver. Once powered and properly
connected to a PC through a USB cable, Windows should
automatically begin installing the necessary device driver. Once the driver installation is complete, a Windows
message appears near the System Icon menu indicating
that the hardware is ready to use. After the hardware is
ready to use, open an approved HID-compliant graphical
user interface (GUI) designed by Maxim Integrated. The
GUI then sends commands of various lengths over the
USB connection. This provides instruction and data for
the IC to communicate with the I2C- and SPI-compatible
devices, or to read or write a specific pin of the IC. All of
the pins, with the exception of P3, have three-state drivers. Since the IC is rated to work with supply voltages
ranging from +2.5V to +5.5V, the EV kit operates from the
same voltage supply as the IC that it is controlling.
Required Equipment
● DS3900H2 EV kit hardware (included)
● Mini-USB cable (included)
● User-supplied Windows XP, Windows Vista, or
Windows 7 PC with a spare USB port
● User-supplied +2.5V to +5.5V power supply (300mA
minimum)
● Approved previously designed HID-compliant GUI
designed by Maxim Integrated
● DS3900H2 breakout board or a previously purchased
compatible Maxim Integrated Ev kit
Setup Procedure
The EV kit communicates with ICs using a PC’s USB port.
It utilizes a MAX3344E USB transceiver (U3) to convert
logic-level signals to USB signals, and USB signals to
logic-level signals acceptable for the microprocessor. The
microprocessor is then able to communicate to the PC
Detailed Description of Hardware
VDUT
VUSB
MAX4787
CURRENT SWITCH
MAX8868
3V3 LDO
3V3
DS3900H2 USB MODULE
D1
FAULT
3800Ω
3V3
USB
PC
EXTERNAL
GND POWER
GND SUPPLY
GND REQUIRED
VDUT
VDUT
HID CLASS
DS900H2 PINS
VCC
MINI-USB
CABLE
D+, D-
3V3
8
MAX3344E
USB
TRANSCEIVER
48MHz
OSCILLATOR
3V3
VDUT
BIDIRECTIONAL
LEVEL
TRANSLATOR
9
D2 GREEN
PULSE
D2 RED
COM
MICROPROCESSOR
P3-PULSE
HB/P3
VDUT
VDUT
R12
4.7kΩ
R11
P11-(SDA)
P11
P10-(SCL)
P1, P2
P4-P9
MCLR
P10
8
P1
P2
P6
P7
P4
P5
P8
P9
MCLR
Figure 1. DS3900H2 Functional Diagram
www.maximintegrated.com
Maxim Integrated │ 3
DS3900H2
USB HID Communications Module for
Evaluation Kits
Table 1. Recommended Operating Conditions
(Typical values are at VCC = 3.3V, TA = +25°C, unless otherwise noted.) (Notes 1 and 2)
PARAMETER
SYMBOL
Supply Voltage
CONDITIONS
VCC
MIN
TYP
+2.5
MAX
+5.5
Supply Current
30
V
mA
0.15 x
VCC
Input Low Voltage
VIL
I/O Pins P1–P11
Input High Voltage
VIH
I/O Pins P1–P11
0.25 x VCC
+ 0.8V
Output High Voltage
VOH
I/O Pins P1–P11, IOH = -3.0mA
VCC - 0.7
Output Low Voltage
VOL
I/O Pins P1–P11, IOL = 8.5mA
Ambient Temperature
UNITS
TA
V
V
V
+0.6
V
-40
+85
°C
I2C Clock Frequency
100
400
kHz
SPI Clock Frequency
186
3000
kHz
750
Note 1: All voltages listed are with respect to ground.
Note 2: Devices are only functionally tested; parameters listed not guaranteed.
Table 2. Pin Description
PIN
I2C
FUNCTION
SPI
P1, P2, P4, P5, P7, P8
HB/P3
General-purpose bit I/O with three-state I/O pin (input, push-pull output driver).
Pulse or general-purpose bit I/O with open-drain I/O pin (input, open drain) output driver.
P6
—
General-purpose bit I/O with three-state I/O pin (input, push-pull output driver).
—
P6
CE (push-pull output driver when used as CE) or general-purpose bit I/O with three-state I/O pin
(input, push-pull output driver).
P9
—
General-purpose bit I/O with three-state I/O pin (input, push-pull output driver).
—
P9
MOSI (push-pull output driver when used as MOSI) or general-purpose bit I/O with three-state I/O
pin (input, push-pull output driver).
P10
—
SCL (open-drain output when used as SCL) or general-purpose bit I/O with three-state I/O pin
(input, push-pull output driver).
P11
—
SDA (open-drain output or input when used as SDA) or general-purpose bit I/O with three-state I/O
pin (input, push-pull output driver).
—
P10
SCK (push-pull output driver when used as SCK) remove built-in pullup resistor R12 or generalpurpose bit I/O with three-state I/O pin (input, push-pull output driver).
—
P11
MISO (input when used as MISO) remove built-in pullup resistor R11 or general-purpose bit I/O
with three-state I/O pin (input, push-pull output driver).
MCLR
Do not connect (reset for microprocessor).
GND
Ground Terminals. All three ground terminals must be connected to ground for operation.
VCC
Power-Supply Terminal. External power supply (VDUT) required.
www.maximintegrated.com
Maxim Integrated │ 4
DS3900H2
USB HID Communications Module for
Evaluation Kits
P1
P11
P2
P10
HB/P3
GND
MCLR
VCC
GND
P9
P4
P8
P5
P7
GND
P6
Figure 2. DS3900H2 Pin Configuration
Designing Hardware to Utilize the Built-In
Support for I2C Devices
The IC has custom firmware that utilizes either a master
synchronous serial port (MSSP) of the microcontroller
configured in I2C mode, or several bit-banging routines
with clock-stretching support. These two modes of operation are configured through the evaluation software. To
utilize the I2C firmware, connect the SCL bus to P10 and
the SDA bus to P11, as shown in Figure 3. The IC has
built-in pullup resistors (R11, R12) that connect 4.7kΩ
resistors to both I2C buses.
Upon initial power-up, the IC configures itself in I2C mode
using the MSSP block of the microcontroller at SCL clock
speed of 400kHz. Note that most evaluation software
www.maximintegrated.com
configures the IC to the desired communication protocol
upon initial software execution and during all USB reconnects of the IC.
For designs that only use the IC to communicate to I2C
devices, the following items must be accounted for in the
hardware design:
● Place the mating connectors on the circuit board
(see Figure 5).
● Connect VCC and all three GND ground terminals.
● Connect the SCL bus to pin P10, and the SDA bus to
P11 of the IC.
● Drive the IC with evaluation software provided by
Maxim Integrated.
Maxim Integrated │ 5
DS3900H2
USB HID Communications Module for
Evaluation Kits
HID CLASS
VDUT*
MINI-USB
CABLE
GND
USB
PC
P1
HB/P3
MCLR
GND
VCC
VCC
P2
R12
VCC
R11
USB MODULE
DS3900H2
SCL
I 2C
DEVICE #2
SDA
P11-SDA
I2C
BUS
P10-SCL
GND
VCC
P9
P4
P8
P5
P7
GND
P6
VCC
GND
SCL
I2C
DEVICE #1
SDA
* VDUT AND GND MUST BE PROVIDED
FROM EXTERNAL SUPPLY.
Figure 3. DS3900H2 Typical I2C Operating Circuit
Designing Hardware to Utilize the Built-In
Support for SPI Devices
The IC has custom firmware that utilizes a master
synchronous serial port (MSSP) of the microcontroller
configured in SPI mode, which allows fast communication
to SPI devices. To utilize this firmware, connect CE to P6,
the MISO bus to P11, the MOSI bus to P9, and the SCK
bus to P10, as shown in Figure 3. The IC has built-in pullup resistors (R11, R12) that connect 4.7kΩ resistors to
both MISO and SCK; this is not applicable for SPI communication and must be removed.
For designs that only use the IC to communicate to SPI
devices, the following items must be accounted for in the
hardware design:
● Place the mating connectors on the circuit board
(see Figure 5).
● Connect VCC and all three GND ground terminals.
● Connect CE to P6, the MISO bus to P11, the MOSI bus
to P9, and the SCK bus to P10 of the IC.
Designing Hardware to Utilize the GeneralPurpose Bit I/O Signals
Utilizing the IC for general-purpose bit I/O is equally
simple as using it for I2C and SPI applications. All the I/O
pins with the exception of P3 have three-state outputs.
These signals can be written to a 0 or a 1 and can be
read as inputs.
P3 has an open-drain output and can be read as an input
pin as well; however, its default function is a system pulse
that provides a visual indication, through the attached
LED, that the IC is operating properly (see Figure 7).
The P3 pin defaults to a slow-pulsing output that can be
disabled, but designs using P3 for I/O should be conscious that the IC could attempt to blink P3 before the
pulse function is disabled. As long as the IC connected
to P3 is tolerant of this behavior, P3 can be used as an
additional I/O. When using P3 as an I/O pin with the
attached LED, writing it to a 1 turns off the pulldown
transistor, which turns the LED off, and writing it to a 0
turns the pulldown and the LED on.
● Remove the built-in pullup resistors (R11, R12).
● Drive the IC with evaluation software provided by
Maxim Integrated.
www.maximintegrated.com
Maxim Integrated │ 6
DS3900H2
USB HID Communications Module for
Evaluation Kits
HID CLASS
* VDUT AND GND MUST BE PROVIDED
FROM EXTERNAL SUPPLY
MINI-USB
CABLE
** PULLUPS R12 AND R11 MUST
BE REMOVED FOR SPI
USB
PC
VDUT*
**
P1
HB/P3
MCLR
GND
USB MODULE
VCC
VCC
P2
R12
R11
DS3900H2
P4
P5
GND
P11-MISO
MISO
P10-SCK
SCK
GND
VCC
MOSI
CE
VCC
SPI
DEVICE
GND
P9-MOSI
P8
P7
P6-CE
Figure 4. DS3900H2 Typical SPI Operating Circuit
Additionally, designs using P10 and P11 as general I/O
should be conscious of the built-in pullup resistors intended for use with I2C devices (see Figure 7).
● If the application is using I2C devices in addition to the
remaining bit I/O signals, make sure to reserve P10
and P11 for the I2C application.
The general procedure for connecting the IC for bit I/O
applications is as follows:
● If the application is using SPI devices in addition to
the remaining bit I/O signals, make sure to reserve P6,
P9–P11 for the SPI application.
● Place the mating connectors on the circuit board
(see Figure 5).
● Connect VCC and all three GND ground terminals.
● Connect P1 through P11 to the application.
www.maximintegrated.com
● Use P3 only if the application is able to tolerate the
pulse function until it is disabled.
● Drive the IC with evaluation software provided by
Maxim Integrated.
Maxim Integrated │ 7
DS3900H2
USB HID Communications Module for
Evaluation Kits
0.100in
0.025in,
16 PLACES
0.025in
16 PLACES
0.100in
8 PLACES
0.240in,16 PLACES
1.200in
Figure 5. Recommended PCB Connection for DS3900H2
www.maximintegrated.com
Maxim Integrated │ 8
DS3900H2
USB HID Communications Module for
Evaluation Kits
1.370in
TOP
1.300in
1.329in
0.57in
0.57in
0.400in
0.305in
0.335in
0.400in
0.335in
0.100in
0.025in
1.22in
1.147in
0.155in
0.100in
0.025in
1.200in
0.815in
SIDE
FRONT
Figure 6. DS3900H2 Dimensions
Note: The IC mates with standard 2.54mm (0.100in) 2 x 8 male header connectors. These connectors do not come standard with
the board.
Table 3. Description of LEDs
LED
COLOR
D1 (FAULT)
Red
USB Power Fault: A fault occurred due to overvoltage limit, current limit, or
thermal limit.
Red
Communication: After the software has initialized the hardware, the LED
flashes red when a command from the PC is received.
D2 (COM)
Red and flashing orange
www.maximintegrated.com
DESCRIPTION
Waiting: Hardware is powered on and waiting for the software to be opened.
Maxim Integrated │ 9
DS3900H2
USB HID Communications Module for
Evaluation Kits
Troubleshooting
All efforts have been made to ensure that the IC works on
the first try, right out of the box. In the rare occasion that
a problem is suspected, see Table 4 to help troubleshoot
the issue.
Table 4. Troubleshooting
SYMPTOM
Windows does not
detect hardware
www.maximintegrated.com
CHECK
SOLUTION
Is the LED labeled D1 on the
DS3900H2 red?
If yes, then the electronic fuse is in a fault state. Inspect for electrical
shorts on the PCB and make sure that the PCB is not sitting on a
conductive surface.
USB cable and port
Try connecting the USB cable to a different USB port on the PC and
wait for a Windows message that indicates that the hardware is ready
to use. If the device is not detected, unplug the USB cable and reboot
the PC. Connect the USB cable.
Are any of the LEDs
illuminated?
If not, then the PCB may not be getting power. Make sure bias is
applied to VCC and all three GND terminals are connected to system
ground. Verify that the USB cable is connected to a PC.
Maxim Integrated │ 10
J2
2
1
4.7k
R7
GND
GND
3.3V
D2A
VDUT
J3
1
2
3
4
5
6
7
8
C1
MAX3344E
RCV USB_DET
VP O
VL
MODE
VTRM
VMO
D+
OE
DSUSP
GND
VP I
VCC
VMI
ENUM
GND
1.0uF
5
4
330
R9
330
R10
2.2k
VP P
HB
COM
D3
C12
P4
OE VDUT
CL K VDUT
P1
P2
RCV VDUT
P6
GND
220nF
J4
D2B
FL AG
GND
OUT
L ED
D1
3
2
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PICfor DS3900
MCL R
P3,HB
COM_L ED,BOOT
P1
P2
RCV
P6, CS
GND
OSC1
OSC2
P4
UOE
PS_VAR
VUSB
U1
ENUM 3V3
VTRM
D+
D-
USB_DET 3V3
100mA current
limiting switch.
OUT
BP
P9
ENUM VDUT
VP I VDUT
VMI VDUT
C4
OUT
GND
C14
0.1uF
C13
1.0uF
GND
3
4
3.3V
4.7uF
C5
3.3V
48MHz Oscillator
OSC_CMOS_4pin
GND
VCC
0.01uF
INH
X1
4
5
VDUT
GND
2
1
MAX8868EUK 33-T
SHDN
GND
IN
U4
3.3V Linear Regulator,
150mA max
1
2
3
P8
P7
P5
USB_DET VDUT
VP O VDUT
VMO VDUT
SCL
SDA
0.1uF
C8
3.3V
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1.0uF
GND
C7
1.0uF
GND
0.1uF
C3
C6
5V
4.7uF
C2
5V
P8,1W_P U
P7,1W_DQ
P5
USB_DET
VP O
VMO
P10,SCK ,SCL
P11,SDI ,SDA
VDD
GND
P9,SDO
ENUM
D+,VP
D-,VM
MAX4787
MAX4787EXK +TCT- ND
IN
ON
U5
R3
USB Transceiver. Converts
USB signals to logical signals.
The high level for the logical
signals is 3.3V.
R8
330
VDUT
VP I 3V3
VMI 3V3
VMO 3V3
OE 3V3
RCV 3V3
VP O 3V3
R ed
U3
G reen
GND
J1
VBUS
1
Vbus
2 R1 25 DD3 R2 25 D+
D+
4
I.D.
5
GND
USB_5P IN
1
www.maximintegrated.com
2
GND
C9
P4
P5
P1
P2
HB
VP P
GND
0.01uF
1
2
3
4
5
6
7
8
GND
FXMA108
P11
P10
GND
VCC
P9
P8
P7
P6
DS3900 Headers - Pinout
DS3900
P1
P2
HB/P 3
MCL R
GND
P4
P5
GND
U6
GND
0.1uF
C11
20
VCCA VCCB
19
A0
B0
18
A1
B1
17
A2
B2
16
A3
B3
15
A4
B4
14
A5
B5
13
A6
B6
12
A7
B7
11
VDUT
GND VP OOE
U2
0.1uF
C10
16
15
14
13
12
11
10
9
P9
P8
P7
P6
SDA
SCL
4.7k
R11
R12
GND
C16
0.1uF
C15
4.7k
VDUT
RCV VDUT
CL K VDUT
4.7uF
VDUT
GND
Q1
NMOS
ENUM VDUT
VMI VDUT
VP I VDUT
OE VDUT
VMO VDUT
VDUT
8-Channel, Bi-Directional Level
Translator. USB side has a fixed 3.3V
reference. PIC side reference is the
varying VDUT reference.
1
ENUM 3V3 2
VMI 3V3 3
VP I 3V3
4
OE 3V3
5
VMO 3V3 6
VP O 3V3 7
RCV 3V3
8
CL K 3V3 9
10
3.3V
R5
10k
USB_DET 3V3
R6
100k
VDUT
External Power must
be supplied to VDUT
GND
R4
10k
USB_DET VDUT
DS3900H2
USB HID Communications Module for
Evaluation Kits
Figure 7. DS3900H2 EV Kit Communications Module Schematic
Maxim Integrated │ 11
DS3900H2
Figure 8. DS3900H2 EV Kit Communications Module PCB
Layout—Top
DS3900H2 Revisions
Revisions yielding significant changes and/or improvements are tracked in firmware and displayed in most
evaluation software provided by Maxim Integrated.
Revisions are broken up into a major and minor revision.
For example, if the DS3900H2’s revision is 3.2, it returns
a major revision of 3 and a minor revision of 2. Knowing
the revision allows the software to both utilize new
functions that are not available in previous versions of
the DS3900H2’s firmware and to avoid using commands
that are not present in prior versions. Although there
are no plans to change the firmware at this time, Maxim
Integrated reserves the right to change the firmware at
any time without notice.
www.maximintegrated.com
USB HID Communications Module for
Evaluation Kits
Figure 9. DS3900H2 EV Kit Communications Module PCB
Layout—Bottom
Intended Use
The DS3900H2 module is intended only to be used to
evaluate Maxim Integrated’s circuits. All hardware, firmware, and any relative software is provided “as is,” without
warranty of any kind, express or implied, including but
not limited to the warranties of merchantability, fitness for
a particular purpose, and noninfringement. In no event
shall Maxim Integrated be liable for any claim, damages
or other liability, whether in an action of contract, tort or
otherwise, arising from, out of, or in connection with the
hardware, firmware, and any relative software or the use
or other dealings in the hardware, firmware, and any
relative software.
Maxim Integrated │ 12
DS3900H2
USB HID Communications Module for
Evaluation Kits
Ordering Information
PART
DS3900H2EVKIT#
TYPE
EV Kit Communications Module
#Denotes an RoHS-compliant device that may include
lead(Pb), which is exempt under the RoHS requirements.
www.maximintegrated.com
Maxim Integrated │ 13
DS3900H2
USB HID Communications Module for
Evaluation Kits
Revision History
REVISION
REVISION
NUMBER
DATE
0
6/13
DESCRIPTION
Initial release
PAGES
CHANGED
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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 and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2013 Maxim Integrated Products, Inc. │ 14
工商网监
湘ICP备2023018690号
