DS3908N-001+ Maxim Integrated Products, DS3908N-001+ Datasheet - Page 7

• Manufacturer Part Number: DS3908N-001+
• Description: Digital Potentiometer ICs IC POT DUAL DIGITAL atile Digital Potent
• Manufacturer: Maxim Integrated Products

Specifications of DS3908N-001+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS3908’s I
state of the A0, A1, and A2 address pins as shown in
the pin configuration (see Figure 1). Address pins con-
nected to GND result in a ‘0’ in the corresponding bit
position in the slave address. Conversely, address pins
connected to V
positions. I
the I
The potentiometers of the DS3908 have 64 taps with 63
resistive elements separating them. Thus, the most and
least significant wiper positions connect the amplifier to
the voltages at the high and low terminals of the poten-
tiometer, respectively.
The potentiometers of the DS3908 are controlled by
communicating with the following registers:
Table 1. Potentiometer Registers
*The two most significant bits of each potentiometer position register are ignored. Writing values greater than 3Fh to any of the
potentiometer registers will result in a valid 6-bit position, without regard to the value of the most significant two bits. Example:
Register values C2h, 82h, 42h, and 02h are all potentiometer position 2.
F8h
F9h
FAh
2
C Serial Interface Description section.
ADDRESS
I
2
2
C Slave Address and Address Pins
C communication is described in detail in
CC
2
C slave address is determined by the
result in a ‘1’ in the corresponding bit
Potentiometer with Buffered Outputs
Potentiometer Control
POTENTIOMETER
Dual, 64-Position Nonvolatile Digital
Pot 0 and Pot 1
Pot 0
Pot 1
_____________________________________________________________________
I
2
C FUNCTIONS
Read/Write
Read/Write
Write Only
Figure 1. DS3908 Slave Address Byte
*THE SLAVE ADDRESS IS DETERMINED BY
MSB
ADDRESS PINS A0, A1, AND A2.
1
0
64 (00h to 3Fh)
64 (00h to 3Fh)
64 (00h to 3Fh)
NUMBER OF
POSITIONS*
1
ADDRESS*
SLAVE
0
A2
A1
A0
READ/WRITE
DEFAULTS
R/W
BIT
LSB
1Fh
1Fh
—
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