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053105
FEATURES
§ Four independent, digitally controlled 64-
position potentiometers
§ Two interface control options
-
5-wire serial
-
2-wire addressable
§ Standard resistance values
-
DS1844-010 10 k
W
-
DS1844-050 50 k
W
-
DS1844-100 100 k
W
§ Mixed resistor value combinations (contact
factory for availability)
§ Operating Temperature Range
- Industrial: -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
VCC
- 2.7V to 5.5V
PS
- Port Select
A0, A1, A2 - Device Select Pins (2-Wire)
SDA
- Serial Data I/O (2-Wire)
SCL
- Serial Clock (2-Wire)
R/ W
- Read/Write enable (5-Wire)
RST
- Serial Port Reset Input (5-Wire)
DIN
- Serial Port Data Input (5-Wire)
CLK
- Serial Port Clock Input (5-Wire)
DOUT
- Cascade Data Output (5-Wire)
H0-H3
- High-end Terminal of Pot
L0-L3
- Low-end Terminal of Pot
W0-W3
- Wiper Terminal of Pot
GND
- Ground
DESCRIPTION
The DS1844 Quad Digital Potentiometer is a four-channel, digitally controlled linear potentiometer. Each
potentiometer is comprised of 63 equi-resistive sections and has three terminals accessible to the user.
These include the high side terminals, HX, the wiper terminals, WX, and the low-side terminals, LX. The
wiper position on the resistor ladder is selected via an 8-bit register value. Communication and control of
the device are supported by two types of serial interface. These include a 5-wire I/O shift register
interface and a 2-wire addressable interface.
DS1844
Quad Digital Potentiometer
www.maxim-ic.com
Device Description
PS
1
20
VCC
H2
2
19
H1
H3
3
18
H0
W3
4
17
W0
L3
5
16
L0
L2
6
15
L1
W2
7
14
W1
R/W, A0
8
13
SCL, CLK
A2, RST
9
12
SDA, DIN
GND
10
11
A1, DOUT
20-Pin DIP (300-mil)
20-Pin SOIC (300-mil)
20-Pin TSSOP (173-mil)