DS18030-010+ Maxim Integrated Products, DS18030-010+ Datasheet - Page 2
![IC POT DUAL ADDRESS 10K 16-DIP](/photos/6/57/65728/175-16-dip_sml.jpg)
DS18030-010+
Manufacturer Part Number
DS18030-010+
Description
IC POT DUAL ADDRESS 10K 16-DIP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS18030-010.pdf
(11 pages)
Specifications of DS18030-010+
Taps
256
Resistance (ohms)
10K
Number Of Circuits
2
Temperature Coefficient
750 ppm/°C Typical
Memory Type
Volatile
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Resistance In Ohms
10K
Number Of Pots
Dual
Taps Per Pot
256
Resistance
10 KOhms
Wiper Memory
Volatile
Digital Interface
Serial (2-Wire)
Operating Supply Voltage
2.7 V to 5.5 V
Supply Current
200 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
Through Hole
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Tolerance
20 %
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DEVICE OPERATION
The DS1803 is an addressable, digitally controlled device which has two 256-position potentiometers. A
functional block diagram of the part is shown in Figure 1. Communication and control of the device is
accomplished via a 2-wire serial interface. Address inputs A0, A1, and A2 allow up to 8 DS1803s to
share the same 2-wire interface.
Each potentiometer is composed of a 256 position resistor array. Two 8-bit registers, each assigned to a
respective potentiometer, are used to set the wiper position on the resistor array. The wiper terminal is
multiplexed to one of 256 positions on the resistor array based on its corresponding 8-bit register value.
For example, the high-end terminals, H0 and H1, have wiper position values FFh while the low-end
terminals, L0 and L1, have wiper position values 00h.
The DS1803 is a volatile device that does not maintain the position of the wiper during power-down or
loss of power. On power-up, the DS1803 wipers’ position will be set to position 00h - the low-end
terminals. The user may then set the wiper value to a desired position.
Communication with the DS1803 takes place over the 2-wire serial interface consisting of the bi-
directional pin, SDA, and the serial clock input, SCL. Complete details of the 2-wire interface are
discussed in the section entitled “2-wire Serial Data Bus.”
Application Considerations
The DS1803 is offered in three standard resistor values, which include 10kΩ, 50kΩ, and 100kΩ. The
resolution of the potentiometer is defined as R
potentiometer. The DS1803 is designed to operate using 3V or 5V power supplies over the industrial
(-40°C to +85°C) temperature range. Maximum input signal levels across the potentiometer cannot
exceed the operating power supply of the device.
2-WIRE SERIAL DATA BUS
The DS1803 supports a bi-directional 2-wire bus and data transmission protocol. A device that sends data
on the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls
the message is called a “master”. The devices that are controlled by the master are “slaves”. The bus must
be controlled by a master device which generates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions. The DS1803 operates as a slave on the 2-wire bus.
Connections to the bus are made via the open-drain I/O lines SDA and SCL.
The following bus protocol has been defined (see Figure 2).
Accordingly, the following bus conditions have been defined:
Bus not busy: Both data and clock lines remain HIGH.
Start data transfer: A change in the state of the data line, from HIGH to LOW, while the clock is
HIGH, defines a START condition.
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in
the data line while the clock line is high will be interpreted as control signals.
2 of 11
TOT
/255, where R
TOT
is the total resistor value of the