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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Thermal Management

Analog Devices Inc./Maxim Integrated DS1780E+

Name: DS1780E+
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS1780E+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS1780E+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Thermal Management

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: DS1780E+.pdf

Description:: IC CPU PERIPHERAL MON 24-TSSOP

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Product details

Overview

DS1780E+ from Maxim Integrated (now Analog Devices) is a highly integrated CPU peripheral monitor IC for PC and embedded microprocessor systems. It performs direct-to-digital ambient temperature sensing (±0.5°C LSB), monitors six power supply voltages (+12V, +5V, +3.3V, +2.5V, +VCCP1, +2.5VS/+VCCP2), measures two fan tachometer inputs, provides an 8-bit DAC output for fan speed control (0–1.25 V), and detects chassis intrusion with battery-backed latching - all in a single 24-pin TSSOP package.

For engineers reviewing the DS1780E+ datasheet, DS1780E+ pinout, DS1780E+ application, or DS1780E+ equivalent, key selection considerations include its 2-wire (I²C-compatible) interface with 2-bit addressability, wide 2.8V–5.75V supply range, integrated NAND TREE for board-level testability, programmable interrupt masking per monitored function, and support for both positive and negative voltage monitoring via external resistor ladders.

Technical Context

The DS1780E+ integrates an 8-bit delta-sigma ADC for analog voltage measurement (with input-specific scaling: e.g., +12VIN LSB = 62.5 mV, +VCCP1 LSB = 14.1 mV), a 9-bit two's-complement temperature sensor (0.5°C resolution), dual fan period-counting circuits with selectable divisors (1/2/4/8), and an 8-bit DAC with rail-to-rail output capability. All conversions are internally digitized and stored in Value RAM (0x20–0x3D).

Its 2-wire serial interface supports slave address configuration via A0/A1 pins (default 0x58), internal register mapping across 64 addresses (e.g., Configuration Register at 0x40, Temperature Config at 0x4B), and hardware interrupt generation (INT pin) with per-source mask registers (0x43/0x44). The RST pin operates as bidirectional reset I/O with ≥20 ms active-low pulse width when enabled.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.8 V to 5.75 V - supports both 3.3 V and 5 V system rails without level-shifting.
Temperature Resolution	0.5 °C LSB - 9-bit two's-complement output enables precise thermal management in PCs and servers.
Voltage Monitoring	6 inputs: +12V, +5V, +3.3V, +2.5V, +VCCP1, +2.5VS/+VCCP2 - scaled internally for ±1% accuracy at nominal values.
Fan Inputs	2 tachometer inputs (FAN1/FAN2) - 8-bit counter with programmable divisor (1/2/4/8); full-scale count = 255 (stopped fan).
DAC Output	8-bit, 0–1.25 V - directly drives fan PWM control circuits without external amplification.
Interface	2-wire (I²C-compatible) with 2-bit addressability - allows up to four DS1780E+ devices on same bus using A0/A1 pins.
Interrupt Capability	Hardware INT pin with per-function masking - supports SMI generation for voltage, temperature, fan, or chassis intrusion events.

Pinout & Package

DS1780E+ is housed in a 24-pin 173-mil TSSOP package (JEDEC MO-153), optimized for high-density PC motherboard layouts. Pin pitch is 0.65 mm; body dimensions are 7.8 mm × 4.4 mm × 1.2 mm.

Pin/Terminal	Circuit Role	Design Meaning
A0/NTOUT	Address Input / NAND TREE Output	LSB of 2-wire address; becomes open-drain output during NAND TREE board-level test.
A1	Address Input	MSB of 2-wire address - sets one of four possible slave addresses (0x58–0x5B).
SDA	2-Wire Serial Data I/O	Open-drain bidirectional data line - requires external pull-up; compatible with standard I²C timing.
SCL	2-Wire Serial Clock Input	Asynchronous clock input - synchronizes all register reads/writes and ADC sampling triggers.
FAN1, FAN2	Fan Tachometer Inputs	Digital inputs accepting 0–VDD logic pulses; internal 22.5 kHz oscillator gated for period measurement.
CHS	Chassis Intrusion Detector	Active-high latched input - retains state even during power-off via external circuit; DS1780E+ provides open-drain reset control (Bit 6 of Config Reg).
VDD	Power Supply	Primary supply input - bypassing with 10 µF + 0.1 µF capacitors required for stable ADC/DAC operation.
INT	Hardware Interrupt Output	Active-low open-drain output - asserts when any unmasked monitored parameter exceeds limit; configurable via INT Mask Registers (0x43/0x44).
VOUT/NTIN	DAC Output / NAND TREE Input	8-bit DAC analog output (0–1.25 V); functions as NAND TREE input when test mode selected.
RST	Remote System Reset I/O	Bidirectional 5 mA open-drain driver - generates ≥20 ms active-low reset pulse when enabled (Bit 4 of Config Reg); also accepts external reset assertion.
GNDD / GNDA	Digital / Analog Ground	Separate ground pins - GNDD for digital logic, GNDA for analog inputs/ADC reference; improves noise immunity in mixed-signal operation.
+xxVIN (Pins 15–19)	Analog Voltage Inputs	Five dedicated positive supply inputs (+12V, +5V, +3.3V, +2.5V, +VCCP1) - internally scaled and converted by 8-bit delta-sigma ADC.
+2.5VS/+VCCP2 (Pin 14)	Negative/Processor Voltage Input	Supports -12V monitoring (via external resistor ladder) or secondary core voltage (VCCP2) - ADC range: 0–3.6 V (14.1 mV/LSB).
VID0–VID4 (Pins 23, 22, 21, 20, 19)	Processor VID Readout Inputs	Digital inputs capturing processor voltage ID bits - read into VID Register (0x47) and VID4 Register (0x49) for dynamic VCCP tracking.

Key Features

Feature	Design Value
Direct-to-digital temperature sensing	No external thermistor or calibration required - internal sensor delivers 0.5°C resolution in 9-bit two's-complement format.
Integrated 8-bit DAC for fan control	0–1.25 V analog output eliminates need for external DAC or op-amp circuitry in thermal management loops.
Chassis intrusion detection with latch	Detects case opening even during system power-off - uses external latching circuit and DS1780E+'s CHS pin with internal open-drain reset control.
Board-level NAND TREE testability	Reduces test time and fixture complexity - internal logic tree enables connectivity verification without external test equipment.
Programmable interrupt masking per function	Independent enable/disable control for voltage, temperature, fan, and chassis intrusion interrupts - prevents false SMI assertions during debug or low-priority conditions.
Wide supply range (2.8V–5.75V)	Operates across legacy 5 V and modern 3.3 V platforms - simplifies BOM consolidation and design reuse in multi-voltage systems.

Applications

Desktop PC Power Monitoring	Server Board Health Management
Use Scenario: Real-time monitoring of +12V, +5V, +3.3V, and +VCCP rails on ATX motherboards to detect overvoltage/undervoltage faults before component damage occurs. IC Role / Device Role / Timing Role: Centralized analog front-end and interrupt arbiter - digitizes six voltage inputs every ~1 second and asserts INT if any exceed user-programmed limits. Use Value: Enables BIOS-level SMI handling for graceful shutdown or alert logging, reducing field failure rates in consumer desktop platforms.	Use Scenario: Continuous thermal supervision of CPU and VRM zones in 1U rack servers, where airflow constraints increase risk of localized overheating. IC Role / Device Role / Timing Role: Ambient temperature sensor and fan speed controller - reads die-adjacent thermal zone, compares against 9-bit threshold, and adjusts DAC output to modulate cooling fan RPM. Use Value: Maintains safe junction temperatures under variable load without host CPU intervention - extends component lifetime and avoids thermal throttling penalties.
Embedded Industrial Control Unit	Security-Aware Edge Gateway
Use Scenario: Power integrity validation in fanless industrial controllers deployed in harsh environments with wide ambient temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Dual-role voltage/temperature supervisor - monitors +24V DC input (scaled via external divider), internal ambient temp, and optional chassis fan; stores min/max values in Value RAM. Use Value: Provides deterministic fault logging via I²C interface - enables predictive maintenance alerts before brownout or thermal lockup events occur.	Use Scenario: Tamper-evident enclosure monitoring in network gateways handling sensitive IoT data, where physical access must trigger audit logs and remote alerts. IC Role / Device Role / Timing Role: Chassis intrusion detector with non-volatile event capture - CHS pin latches intrusion state even during AC power loss; retained until explicitly cleared via software. Use Value: Meets physical security requirements for NIST SP 800-193 compliance - ensures tampering is detectable and reportable independent of host OS state.

Desktop PC Power Monitoring

Server Board Health Management

Use Scenario: Real-time monitoring of +12V, +5V, +3.3V, and +VCCP rails on ATX motherboards to detect overvoltage/undervoltage faults before component damage occurs.

IC Role / Device Role / Timing Role: Centralized analog front-end and interrupt arbiter - digitizes six voltage inputs every ~1 second and asserts INT if any exceed user-programmed limits.

Use Value: Enables BIOS-level SMI handling for graceful shutdown or alert logging, reducing field failure rates in consumer desktop platforms.

Use Scenario: Continuous thermal supervision of CPU and VRM zones in 1U rack servers, where airflow constraints increase risk of localized overheating.

IC Role / Device Role / Timing Role: Ambient temperature sensor and fan speed controller - reads die-adjacent thermal zone, compares against 9-bit threshold, and adjusts DAC output to modulate cooling fan RPM.

Use Value: Maintains safe junction temperatures under variable load without host CPU intervention - extends component lifetime and avoids thermal throttling penalties.

Embedded Industrial Control Unit

Security-Aware Edge Gateway

Use Scenario: Power integrity validation in fanless industrial controllers deployed in harsh environments with wide ambient temperature swings (-40°C to +85°C).

IC Role / Device Role / Timing Role: Dual-role voltage/temperature supervisor - monitors +24V DC input (scaled via external divider), internal ambient temp, and optional chassis fan; stores min/max values in Value RAM.

Use Value: Provides deterministic fault logging via I²C interface - enables predictive maintenance alerts before brownout or thermal lockup events occur.

Use Scenario: Tamper-evident enclosure monitoring in network gateways handling sensitive IoT data, where physical access must trigger audit logs and remote alerts.

IC Role / Device Role / Timing Role: Chassis intrusion detector with non-volatile event capture - CHS pin latches intrusion state even during AC power loss; retained until explicitly cleared via software.

Use Value: Meets physical security requirements for NIST SP 800-193 compliance - ensures tampering is detectable and reportable independent of host OS state.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU peripheral monitoring applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM87CIMT/NOPB	11-bit temperature resolution; supports SMBus Alert Response Address; no VID inputs; 3.3 V only supply.	Lacks chassis intrusion detection and VID readback - unsuitable for Intel Pentium 4/Core-era platforms requiring dynamic VCCP tracking.	Choose LM87CIMT/NOPB only for simpler 3.3 V-only designs needing higher thermal resolution but no security or processor voltage features.
ADM1027ARUZ	Includes remote diode temperature sensing; 10-bit DAC; supports SMBus 2.0; no NAND TREE; different pinout and register map.	Requires external thermal diode for CPU junction sensing - adds cost and layout complexity vs. DS1780E+'s integrated ambient sensor.	Select ADM1027ARUZ when remote CPU die temperature monitoring is mandatory and board space permits additional components.

Compared with LM87CIMT/NOPB and ADM1027ARUZ, the DS1780E+ uniquely combines chassis intrusion latching, VID readout, NAND TREE testability, and dual-voltage-range operation (2.8–5.75 V) in a single 24-pin TSSOP - making it optimal for cost-sensitive, security-aware PC and embedded x86 platforms requiring minimal external components.

Availability

DS1780E+ is available at Aetrix Electronics and suitable for desktop PC motherboard manufacturing, server board health monitoring, embedded industrial control units, security-aware edge gateways, and legacy x86 platform refurbishment requiring stable component supply and long-term lifecycle support.

Supply support for DS1780E+ 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

Analog Devices (formerly Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and computing markets.

The DS1780E+ belongs to Maxim's CPU Peripheral Monitor product line, designed specifically for real-time power, thermal, and security supervision in personal computers and microprocessor-based systems - emphasizing integration, low external component count, and compatibility with industry-standard 2-wire interfaces.

FAQ

What is the primary function of the DS1780E+ in a PC motherboard design?

The DS1780E+ serves as a centralized system instrumentation monitor on PC motherboards, performing simultaneous ambient temperature sensing, six-power-supply voltage monitoring (+12V, +5V, +3.3V, +2.5V, +VCCP1, +2.5VS/+VCCP2), dual-fan speed measurement, chassis intrusion detection, and fan speed control via its integrated 8-bit DAC. Its 2-wire interface enables seamless integration with the host CPU's SMBus controller for real-time health reporting and SMI generation - eliminating the need for discrete comparators, ADCs, or logic gates in the power management subsystem.

Does the DS1780E+ support monitoring of negative supply voltages such as -12V?

Yes, the DS1780E+ supports -12V monitoring through its +2.5VS/+VCCP2 pin, but requires an external resistor ladder (e.g., R1 = 4 kΩ, R2 = 23.2 kΩ with +5 V reference) to translate the -12V range into 0–3.6 V input acceptable to the internal 8-bit ADC. This configuration yields a resolution of ~96 mV/LSB and maps -12V to ~0x00 and 0V to ~0xFF. The DS1780E+ datasheet provides Figure 1 and Table 6 detailing the exact voltage-to-code relationship for this setup.

How does the DS1780E+ handle fan speed measurement and what are the supported RPM ranges?

The DS1780E+ measures fan speed by counting periods of tachometer pulses on FAN1 and FAN2 inputs using an internal 22.5 kHz oscillator gated by each fan signal. With default ÷2 divisor, a nominal 4400 RPM fan yields a count of 153; 70% (3080 RPM) yields 219, and 60% (2640 RPM) yields 255 - indicating potential failure. Divisor options (1/2/4/8) allow scaling for fans from 1100 RPM (÷8 mode) to 8800 RPM (÷1 mode), all referenced to two pulses per revolution.

Can the DS1780E+ generate interrupts for individual monitored parameters, and how is masking configured?

Yes, the DS1780E+ supports independent interrupt masking for each monitored function - voltage, temperature, fan speed, and chassis intrusion - via two dedicated Interrupt Mask Registers (0x43 and 0x44). Each bit corresponds to a specific limit or event source, allowing selective enabling/disabling without affecting others. The hardware INT pin output is further controlled by Bit 1 of the Configuration Register (0x40), while individual status bits are latched in Interrupt Status Registers (0x41/0x42) and cleared upon read.

What is the role of the NAND TREE functionality in the DS1780E+, and how is it accessed?

The NAND TREE in the DS1780E+ is an integrated board-level test structure that simplifies connectivity verification during manufacturing. It is accessed by asserting the NTIN signal (via VOUT/NTIN pin) while configuring A0/NTOUT as output - enabling automated continuity testing between DS1780E+ and other NAND TREE-enabled components without external test fixtures. This reduces test time and improves yield in high-volume PC motherboard production.

DS1780E+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Active

Function:: Thermal Monitor, CPU Peripherals

Sensor Type:: Internal

Sensing Temperature:: -40°C ~ 125°C

Accuracy:: ±12%

Topology:: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank

Output Type:: I2C/SMBus

Output Alarm:: No

Output Fan:: Yes

Voltage - Supply:: 2.8V ~ 5.75V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP

DS1780E+ FAQ

1.How can I place an order for DS1780E+ through Aetrix?

Please submit a Request for Quotation (RFQ) for DS1780E+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DS1780E+ reliable?

The price and inventory of DS1780E+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1780E+ is usually 5 days.

3.What payment methods are accepted for DS1780E+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1780E+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS1780E+?

DS1780E+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS1780E+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DS1780E+?

For technical support, including DS1780E+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1780E+ requirements.

6.How does Aetrix verify that DS1780E+ is sourced from the original manufacturer or authorized distributors?

All DS1780E+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS1780E+ meets industry standards.

7.What is the process for return or replacement of DS1780E+?

All DS1780E+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1780E+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DS1780E+ part is unused and in its original packaging.

Return procedure for DS1780E+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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