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What is DS3900?

This electronic component, produced by the manufacturer "Dallas Semiconducotr", performs the same function as "Serial Communications Module".


DS3900 Datasheet PDF - Dallas Semiconducotr

Part Number DS3900
Description Serial Communications Module
Manufacturers Dallas Semiconducotr 
Logo Dallas Semiconducotr Logo 


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Rev 1; 7/04
Serial Communications Module
For Evaluation Kits
General Description
The DS3900 provides bidirectional communication with
2-wire and 3-wire devices using a PC’s serial
port. In addition, it can also be used as a general-pur-
pose digital I/O interface with 11 I/O signals that can
evaluate a wide variety of ICs.
The DS3900 is intended for evaluation purposes only.
Applications
Prototyping 2-Wire and 3-Wire Device Designs
Evaluating 2-Wire and 3-Wire Devices
Building Test Software for Systems Containing
2-Wire or 3-Wire Devices
Communicating With ICs that Require up to 11 I/O
Signals
Features
Communicates from PCs to ICs Through a
Serial Port
Fast Communication to 2-Wire Devices
Eleven General-Purpose Digital I/O Pins,
Including SDA and SCL
Built-in Pullup Resistors for SDA and SCL
Minimize Required External Hardware
Connection to Standard Prototyping Boards
Possible Using Header Connectors
Operates from 3.0V to 5.5V
PART
DS3900EVKIT
Ordering Information
DESCRIPTION
DS3900 Module
DS3900 Photo
Pin Configuration
P1
P2
P3
(N.C.) RESET
GND
P4
P5
GND
JP1
DS3900 R1.0
U1
X1
C1
SCL
SDA
C4
C6
C5
R2
R3 JP2
P11 / SDA
P10 / SCL
GND
VCC
P9
P8
P7
P6
Typical Operating Circuit appears at end of data sheet.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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DS3900 equivalent
Serial Communications Module
For Evaluation Kits
Table 1. DS3900 Command Protocol
COMMAND
Packet Write*
1ST BYTE SENT
0x8%
% = number of bytes to
write -1
Packet Read*
0x9%
% = number of bytes to
read -1
2-Wire Start*
(and Repeated Start)
0xA0
2-Wire Write Byte*
0xA1
2ND BYTE SENT
Memory address
followed by %+1 data
bytes
Memory Address
0x00, Ignored
Data
0x00-0xFF Valid
2-Wire Read Byte*
0xA2
Acknowledge
0x01 ACK
0x00 NACK
2-Wire Stop*
Toggle SCL 9 Times
Set Packet Device Address*
Pulse Enable/Disable
(Available after Rev 1.1)
Pulse Fast/Slow
(Available after Rev 1.1)
0xA3
0xA4
0xA5
0xC0
0xC1
0x00, Ignored
0x00, Ignored
Device Address
0x00-0xFE
Even Values Only
0x00 Disable
0x01 Enable
0x00 Pulse Slow
0x01 Pulse Fast
Read Revision
(Available after Rev 2.0)
0xC2
0x00, Ignored
Bit I/O Read**
Bit I/O Write**
0xE#
# determines pin to read. 0x00, Ignored
(See Table 2)
0xF#,
Write Pin P#
# determines pin to write. 0x00 Low
(See Table 2)
0x01 High
*See Using the DS3900 with 2-Wire Devices section.
**See Using the DS3900's General-Purpose Bit I/O Signals section.
RETURNED BYTE(S)
0x8% Command Successful
0xFA Command Failed
(%+1) Data bytes followed by
0x9% Command Successful
0xFA Command Failed
0xB0 Command Successful
0xFA Command Failed
0xB1 Command Successful
0xFA Command Failed
1st Returned Byte
Data
2nd Returned Byte
0xB2 Command Successful
0xFA Command Failed
0xB3 Command Successful
0xFA Command Failed
0xB4 Command Successful
0xFA Command Failed
0xB5 Command Successful
0xFA Command Failed
0xD0 Command Successful
0xFA Command Failed
0xD1 Command Successful
0xFA Command Failed
1st Returned Byte
Major Revision
2nd Returned Byte
Minor Revision
3rd Returned Byte
0xD2 Command Successful
0xFA Command Failed
0x00 Pin P# Low
0x01 Pin P# High
0xFA Command Failed
0xF0 Command Successful
0xFA Command Failed
_____________________________________________________________________ 5


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