Analog Devices Inc./Maxim Integrated DS1846E-010+

Overview

DS1846E-010+ from Maxim Integrated is a nonvolatile tri-potentiometer, 248-byte EEPROM, and MicroMonitor IC integrating two 10kΩ/100-position and one 100kΩ/256-position digital potentiometers, precision voltage monitoring, pushbutton reset, and NMI generation - all in a single 20-pin TSSOP package for embedded power supervision and analog biasing applications.

For engineers reviewing the DS1846E-010+ datasheet, DS1846E-010+ pinout, DS1846E-010+ application, or DS1846E-010+ equivalent, key selection considerations include its dual-voltage-monitoring capability (VCC and IN), hardware write-protection via WP pin, 2-wire interface compatibility with 100kHz/400kHz modes, and guaranteed industrial temperature operation from –40°C to +85°C.

Technical Context

The DS1846E-010+ implements a dedicated MicroMonitor subsystem with independent VCC trip point (4.15–4.40V) and user-configurable IN input threshold (1.15–1.25V), enabling early power-fail warning and dual-level supply supervision. Its 2-wire interface operates in both standard (100kHz) and fast (400kHz) modes with open-drain SDA/SCL and internal pullups on WP and PBRST.

Three digitally controlled potentiometers are mapped to fixed EEPROM addresses (F8h–FAh): Pot1 (100kΩ, 256-step, 00h–FFh), Pot0/Pot2 (10kΩ, 100-step, 00h–63h). Wiper settings persist across power cycles via NV storage, and all resistor terminals tolerate voltages from GND–0.3V to VCC+0.3V.

Key Specifications

Pinout & Package

Package: 20-pin Thin Shrink Small Outline Package (TSSOP), 0.65mm pitch, body size 6.5mm × 4.4mm - surface-mount compatible with automated assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer + supervisory applications.

Compared with MAX5477EUD+, DS1846E-010+ adds dual-voltage monitoring and reset generation; compared with TPS3808G33DBVR, it integrates nonvolatile trimming and configuration storage - making DS1846E-010+ uniquely suited for compact, self-contained analog/digital supervision nodes.

Availability

DS1846E-010+ is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded instrumentation requiring stable component supply, long-term calibration retention, and deterministic power-fail response.

Supply support for DS1846E-010+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS1846E-010+ belongs to Maxim's MicroMonitor family - engineered to consolidate voltage supervision, nonvolatile trimming, and system reset into a single chip for space- and cost-sensitive embedded control systems.

FAQ

What is the function of the WP pin on the DS1846E-010+?

The WP (Write-Protect) pin on the DS1846E-010+ disables all writes to both the 248-byte user EEPROM and the three potentiometer wiper registers (F8h–FAh) when held high or left floating. It must be pulled low to permit configuration changes. This hardware-level protection prevents accidental corruption during firmware updates, noise events, or unintended I²C traffic - a critical safeguard for field-deployed systems relying on persistent calibration data stored in DS1846E-010+.

How does the DS1846E-010+ generate reset signals during power-up and power-down?

The DS1846E-010+ asserts both active-low and active-high RST outputs for ≥200ms after VCC rises above 4.15V (power-up) and holds them active until VCC falls below 4.15V (power-down). During power-down, it also generates an NMI pulse when VCC crosses the trip point, providing early warning before reset activation. These timing-critical functions are fully internal - no external capacitors or resistors are needed - ensuring repeatable DS1846E-010+ reset behavior across temperature and unit-to-unit variation.

Can the DS1846E-010+ monitor a voltage rail other than VCC?

Yes. The DS1846E-010+ includes a dedicated IN pin that connects to an external resistor divider to monitor a secondary voltage rail (e.g., +3.3V, +12V, or analog supply). The internal comparator trips when the divided voltage falls below 1.15–1.25V, asserting NMI independently of VCC status. This allows DS1846E-010+ to provide tiered supervision - e.g., NMI for auxiliary rail failure and RST for main supply collapse - enabling prioritized system responses without additional ICs.

What are the valid wiper setting ranges for each potentiometer in the DS1846E-010+?

The DS1846E-010+ has three potentiometers: Pot0 and Pot2 are 10kΩ/100-step devices addressed at EEPROM F9h and FAh, accepting values 00h–63h (0–99 decimal); Pot1 is 100kΩ/256-step at F8h, accepting 00h–FFh (0–255). Writing values beyond these ranges is safe - the MSB is ignored for 100-step pots, and only the lower 8 bits are used for Pot1. All wiper positions are stored nonvolatily and restored at power-on, ensuring DS1846E-010+ maintains calibrated analog settings across cycles.

Is the DS1846E-010+ compatible with standard I²C buses?

Yes. The DS1846E-010+ implements a standard 2-wire interface compatible with I²C protocols at both 100kHz (standard mode) and 400kHz (fast mode). Its SDA and SCL pins are open-drain with defined timing (tSU:DAT, tHD:DAT, etc.) matching I²C specifications. Addressing uses a 7-bit slave address (101000A0) with R/W bit, and ACK/NACK behavior conforms to I²C conventions - allowing direct integration with any I²C master microcontroller without protocol translation or level-shifting for 5V systems. This ensures seamless DS1846E-010+ interoperability in existing I²C-based designs.