User manual

MCP4725 SOT-23-6 EVALUATION
BOARD USER’S GUIDE
© 2007 Microchip Technology Inc. DS51669A-page 5
Chapter 1. Quick Start Instructions
1.1 INTRODUCTION
The following sections provide an overview of the MCP4725 SOT-23-6 Evaluation
Board and Instruction how to program the DAC register and EEPROM of the MCP4725
device using the PICkit Serial Analyzer. The following sections cover the following
topics:
• What is the MCP4725 SOT-23-6 Evaluation Board?
• How to use the MCP4725 SOT-23-6 Evaluation Board with the PICkit Serial
Analyzer
1.2 WHAT IS THE MCP4725 SOT-23-6 EVALUATION KIT
The MCP4725 SOT-23-6 Evaluation Board contains the MCP4725 single channel
12-Bit Digital-to-Analog Converter (DAC) and I
2
C loading resistors.
The purpose of this board is:
• Quick evaluation of the MCP4725 features using the PICkit Serial Analyzer:
The user can program the DAC Register or EEPROM using the PICkit Serial
Analyzer and measure the MCP4725 device analog output voltage using a volt-
meter
• Easy handling of the MCP4725 device in a tiny SOT23-6 package: The
MCP4725 device is available in a small SOT-23-6 package. This board makes it
easy to handle the small package device for user’s application evaluations. The
user can simply connect the J1 pins on the evaluation board to the user’s test
board for a quick evaluation of the MCP4725 device. The MCP4725 supports
standard mode (100 kHz), fast mode (400 kHz), and high speed mode (3.4 MHz).
This evaluation board is using 5 kΩ for the I
2
C pull-up resistors. This 5 kΩ
supports up to 400 kHz. The user can replace the R
1
and R
3
with lower values
(less than 1 kΩ) for the high-speed mode (3.4 MHz)
1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER
The user can use the MCP4725 SOT-23-6 Evaluation Board in two different ways: (a)
together with the PICkit Serial Analyzer or (b) by connecting this board to the user’s
target board directly.
Figure 1-1 shows the MCP4725 SOT-23-6 Evaluation Board. The SCL, SDA, V
DD
, and
V
SS
pins in the J1 connector are connected to the MCP4725 device.
The MCP4725 SOT-23-6 Evaluation Kit contains two MCP4725 SOT-23-6 Evaluation
Boards. This board can easily be programmed using the PICkit Serial Analyzer
(DV164122). It is highly recommended that the user order the MCP4725 SOT-23-6
Evaluation Board and the PICkit Serial Analyzer at the same time.
On the MCP4725 SOT-23-6 Evaluation Board, the R
1
and R
3
are the I
2
C pull-up load
resistors for the SDA and SCL, respectively. The user can replace them with their own
component values of interest. It is also recommended that these pull-up resistors be
removed if the user’s test board has the pull-up resistors already. The MCP4725
SOT-23-6 Evaluation Board also has footprints for additional pull-up resistors (in
parallel with the R
1
and R
3
) and loading capacitors. The user can populate the board
with their own components.