Microchip Technology ADM00317 数据表
Quick Start Instructions
© 2011 Microchip Technology Inc.
DS51932B-page 11
1.3
I
2
C ADDRESS BYTE FOR EACH DEVICE
Each DAC device on the board has its own I
2
C address bits which are preprogrammed
at the factory. Table 1-2 shows the I
2
C address byte of each device.
TABLE 1-1:
TERMINAL FUNCTION TABLE
Connector/Pin/Terminal Name
Functions
J1 Connector
Connector for PICkit
TM
Serial Analyzer.
Note: Do not use this pin when this board is used with the
Explorer 16 Development Board.
Explorer 16 Development Board.
J3 Connector
Connector for Explorer 16 Development Board.
Note: Do not use this pin when this board is used with the
PICkit
Note: Do not use this pin when this board is used with the
PICkit
TM
Serial Analyzer.
External Reference Selection
Jumper Pins
Jumper Pins
(a) Connect pin 2 to “V
REF_EXT
” if external reference is
applied at the V
REF_EXT
pin.
(b) Connect pin 2 to “
V
DD
” if
V
DD
is used as reference
externally.
Note: This pin does not affect if
Note: This pin does not affect if
V
DD
is selected as
reference internally by the configuration bit setting.
JP1
V
DD
connection through (a) J1 Connector for PICkit
TM
Serial Analyzer, or (b) J3 Connector for Explorer 16
Development Board.
Development Board.
JP2
Connecting
V
OUT
1 (MCP4726 output) to Buzzer.
Note: Do not connect this jumper if you don’t need audible
sounds.
sounds.
V
DD
(a)
V
DD
monitoring terminal when JP1 is connected (
V
DD
is provided by the external tools).
(b)
(b)
V
DD
connection terminal when JP2 is disconnected.
You can connect your own
V
DD
to this pin.
V
SS
Ground Reference
V
OUT
1
DAC output terminal from MCP4726 (12-bit DAC).
V
OUT
2
DAC output terminal from MCP4716 (10-bit DAC).
V
OUT
3
DAC output terminal from MCP4706 (8-bit DAC).
V
REF_EXT
External Reference connection terminal
SDA
Connected to I
2
C
TM
SDA line
SCL
Connected to I
2
C
TM
SCL line
VR1
Volume control for Buzzer 1.
Note: Disconnect JP2 if you don’t need audible sounds.
Note: Disconnect JP2 if you don’t need audible sounds.
TABLE 1-2:
I2C ADDRESS BYTE OF EACH DAC DEVICE
Device
Address Byte (1st Byte):
Device Code + Address Bits (A2, A1, A0) + R/W
I
2
C Address
Byte for Write
Command
(1st Byte)
I
2
C Address
Byte for Read
Command
(1st Byte)
MCP4726
(12-bit DAC)
(12-bit DAC)
1100-000R/W
1100-0000
1100-0001
MCP4716
(10-bit DAC)
(10-bit DAC)
1100-001R/W
1100-0010
1100-0011
MCP4726
(8-bit DAC)
(8-bit DAC)
1100-010R/W
1100-0100
1100-0101
where R/W = 0 for write command and 1 for read command.