DS1804Z-010+T&R Digital Potentiometer ICs

Technical Specifications of DS1804Z-010+T&R

Datasheet	DS1804Z-010+T&R datasheet
Category	Integrated Circuits (ICs)
Family	Data Acquisition – Digital Potentiometers
Manufacturer	Maxim Integrated
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Taper	Linear
Configuration	Potentiometer
Number of Circuits	1
Number of Taps	100
Resistance (Ohms)	10k
Interface	Up/Down (U/D, CS)
Memory Type	Non-Volatile
Voltage – Supply	2.7 V ~ 5.5 V
Features	–
Tolerance	±20%
Temperature Coefficient (Typ)	750 ppm/°C
Resistance – Wiper (Ohms) (Typ)	400
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SOIC

DS1804Z-010+T&R Description

Nonvolatile digital trimmer potentiometer DS1804 NV has 100 settings. Using a central processing unit (CPU) or a manual control input, along with a minimal amount of external circuitry, the device offers an ideal method for applications that require trimming at a low cost. The DS1804 features an on-demand EEPROM memory storage option that allows the wiper position to be saved. Using a three-terminal port with an increment/decrement counter-controlled interface, the wiper’s function on the device can be changed.

This port comprises CS, INC, and U/D control inputs, respectively. The DS1804 is offered in three different resistor grades, including a 10k, a 50k, and a 100k.

The product is available in a temperature grade suitable for use in industrial environments. In addition, the DS1804 can run off either 3V or 5V power supplies, making it an excellent choice for portable application specifications. There are three different packaging options available, and they are as follows: an 8-pin (300 mils) DIP package, an 8-pin (150 mils) SO package, and an 8-pin (118 mils) SOP package.

DS1804Z-010+T&R Features

• Potentiometer with a single taper and 100 positions.
• Storage that is nonvolatile (NV) and can be wiped on demand
• It functions properly when supplied with either 3V or 5V.
• Interface with an Up/Down, Increment-Controlled Dial.
• There is an 8-Pin DIP (300 mils), an 8-Pin SO (150 mils), and an 8-Pin SOP (118 mils) version available.
• Operating Temperature Range of -40 degrees Celsius to 85 degrees Celsius.

Operation

A single nonvolatile potentiometer is what the DS1804 device is. The apparatus has one hundred tap points, including the L and H terminals. Between the L- terminals and the H- terminals, there is a total of 99 resistive segments. The W-terminal can be moved using a three-terminal control port and can access these tappoints. The chip-select input activates the DS1804’s three-terminal port’s increment/decrement interface. These input signals are CS, INC, and U/D, and they make up this interface. A 7-bit up/down counter is under the control of these input signals.

The 7-bit up/down counter controls the wiper position via a 1 of 100 decoders. With this interface, the CS and INC input control pins can also be used for wiper storage. This is the timing diagram for the control of the three-terminal interface.

PIN DESCRIPTIONS VCC – Power Supply

The supply voltages that the DS1804 can support range from +2.7V to +5.5V.

GND – Ground

● H

A potentiometer with a high terminal. This terminal on the potentiometer is considered to be the high one. This terminal does not have to be connected to a potential more elevated than the L-terminal; doing so is unnecessary. The voltage applied to the H-terminal must not be lower than ground or higher than the voltage supplied by the power supply (VCC).

● L

Low-Terminal Potentiometer. This is the end of the potentiometer connected to the low terminal. This terminal does not need to be connected to a potential lower than the H-terminal; doing so is unnecessary. The voltage applied to the L-terminal must not be lower than ground or higher than the voltage supplied by the power supply (VCC).

● W

Wiper of the Potentiometer. The wiper of the potentiometer is located on this pin. The position it occupies on the resistor array is determined by the control port consisting of three terminals. The voltage applied to the wiper must not be lower than ground or higher than the voltage supplied by the power supply, known as VCC.

● CS

Chip Select. The DS1804’s control port must first be activated using the input of the control signal, or CS. This input has a low-impedance state (active low). When the wiper is in its high state, activity on the INC and U/D port pins won’t change where it is.

● INC

Wiper Movement Control. When the CS pin is held low, this input allows changes to be made to the wiper position. Changes in the wiper position of the W-terminal will occur at a rate of one position for every high-to-low transition triggered by this input signal. If the CS pin is in a high state, position changes will not occur.

● U/ D

Up/Down Control. This input determines the path that the wiper will travel in. When in a high state and CS is in a low condition, any transition from high to low on INC will cause the wiper to move one position closer to the H-terminal. This movement will occur regardless of whether or not CS is high or low. Any transitions from a high to a low state on INC will cause the position of the wiper to move closer to the L-terminal when it is in an inferior condition, and CS is also in a low state.

Power-Up/Power-Down Conditions

When power is turned on, the wiper position register will load the DS1804’s EEPROM value (or 1 of 100 decoder). Afterward, by utilizing the three-terminal control port, the value of this register can be changed to another wiper position if that is what the user desires. Once the power supply has stabilized, The position of the windshield wipers will be loaded at the beginning of the power cycle in a period of no more than 500 milliseconds.

In addition, after a delay of 50 milliseconds, it will turn on the three-terminal interface port. The data stored in the wiper position register will be lost when the power is turned off. After the next time that the device is powered on, The wiper position register will be set to the value stored in the EEPROM memory. Maxim Integrated Products doesn’t promise that a product’s EEPROM memory will have a certain value after it leaves the factory.This value ought to be determined by the customer according to their requirements.

Nonvolatile Wiper Storage

It is possible to store the wiper position of the DS1804 by using the INC and CS inputs. When the CS input goes from low to high while the INC is high, a record of the wiper position is saved. When the INC is high, this condition will write the wiper position to the EEPROM memory. Before a wear-out situation occurs, the DS1804 is designed to accept 50,000 writes to EEPROM at temperatures ranging from 0 to 70 degrees Celsius. The DS1804 will continue to function normally even after it has worn out, and the wiper position can be adjusted using the three-terminal control port while the device is powered on. However, the position of the wipers will be unknown once the power is turned on.

One-Time Programmability (OTP)

The DS1804 is an OTP device that is very easy to use. According to the guidelines provided above, the DS1804 user can trim the wiper position to the desired value and then save this position. Any activity that typically occurs through the three-terminal port will be stopped if the CS input pin is connected to VCC. In addition, using an OTP application does not negatively impact the number of times EEPROM is written. This is because EEPROM is only loaded and not written when the device is in the power-up or power-down states—powering on the DS1804 loads the EEPROM memory’s current value into the wiper position register.

Conclusion

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