The DS1804 NV trimmer potentiometer is a nonvolatile digital
potentiometer that has 100 positions. The device provides an ideal
method for low-cost trimming applications using a CPU or manual
control input with minimal external circuitry. Wiper position of
the DS1804 can be stored in EEPROM memory on demand. The device’s
wiper position is manipulated by a three-terminal port that
provides an increment/ decrement counter controlled interface. This
port consists of the control inputs CS , INC , and U/ D . The
DS1804 is available in three resistor grades, which include a 10kΩ,
50kΩ, and 100kΩ. The device is provided in an industrial
temperature grade. Additionally, the DS1804 will operate from 3V or
5V supplies and is ideal for portable application requirements.
Three packaging options are available and include the 8-pin (300
mils) DIP, 8-pin (150 mils) SO, and 8-pin (118 mils) μSOP
OPERATION
The DS1804 is a single nonvolatile potentiometer. The device has a
total of 100 tap-points including the L- and H- terminals. A total
of 99 resistive segments exist between the L- and H- terminals.
These tappoints are accessible to the W-terminal, whose position is
controlled via a three-terminal control port. A block diagram of
the DS1804 is shown in Figure 1. The three-terminal port of the
DS1804 provides an increment/decrement interface which is activated
via a chip-select input. This interface consists of the input
signals CS , INC , and U/ D . These input signals control a 7-bit
up/down counter. The output of the 7-bit up/down counter controls a
1 of 100 decoder to select wiper position. Additionally, this
interface provides for a wiper storage operation using the CS and
INC input control pins. The timing diagram for the three-terminal
interface control is shown in Figure 2.
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