DS1844_05 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – Quad Digital Potentiometer

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FEATURES
§ Four independent, digitally controlled 64-
position potentiometers
§ Two interface control options
- 5-wire serial
- 2-wire addressable
§ Standard resistance values
- DS1844-010 10 kW
- DS1844-050 50 kW
- DS1844-100 100 kW
§ Mixed resistor value combinations (contact
factory for availability)
§ Operating Temperature Range
- Industrial: -40°C to +85°C
DS1844
Quad Digital Potentiometer
PIN ASSIGNMENT
PS
1
20
H2 2
19
H3 3
18
W3 4
17
L3
5
16
L2
6
15
W2 7
14
R/W, A0
8
13
A2, RST
9
12
GND
10
11
20-Pin DIP (300-mil)
De2v0i-cPeinDSeOsIcCri(p3t0i0o-nmil)
20-Pin TSSOP (173-mil)
V_CC
H1
H0
W0
L0
L1
W1
SCL, CLK
SDA, D_IN
A1, D_OUT
PIN DESCRIPTION
V_CC
- 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
D_IN
CLK
D_OUT
H₀-H₃
L₀-L₃
W₀-W₃
GND
- Serial Port Reset Input (5-Wire)
- Serial Port Data Input (5-Wire)
- Serial Port Clock Input (5-Wire)
- Cascade Data Output (5-Wire)
- High-end Terminal of Pot
- Low-end Terminal of Pot
- Wiper Terminal of Pot
- 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, H_X, the wiper terminals, W_X, and the low-side terminals, L_X. 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.
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