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Analog Devices Inc./Maxim Integrated DS1780E/T&R
- Part No.:
- DS1780E/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DS1780E/T&R.pdf
- Description:
- IC CPU PERIPHERAL MON 24-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
DS1780E/T&R from Maxim Integrated (now Analog Devices) is a highly integrated CPU peripheral monitor IC for PC and embedded microprocessor systems. It performs real-time monitoring of ambient temperature (9-bit, ±0.5°C LSB), six power supply voltages (+12V, +5V, +3.3V, +2.5V, +VCCP1, +2.5VS/+VCCP2), two fan tachometer inputs (FAN1/FAN2), chassis intrusion detection, and provides 8-bit DAC-controlled fan speed output - all in a single 24-pin TSSOP package.
For engineers reviewing the DS1780E/T&R datasheet, DS1780E/T&R pinout, DS1780E/T&R application, or DS1780E/T&R equivalent, this page delivers verified functional identity, validated pin roles, confirmed voltage/temperature/fan measurement resolution, interrupt behavior, and direct alternative part comparisons - supporting rapid system-level thermal and power integrity validation.
Technical Context
The DS1780E/T&R implements a synchronized round-robin analog monitoring loop that samples temperature, six voltage inputs, and two fan tachometers once per second. Its internal 8-bit delta-sigma ADC converts voltage inputs with scaling-specific LSB weights (e.g., 62.5 mV for +12VIN, 14.1 mV for +VCCP1), while temperature is digitized to 9-bit two's complement format with 0.5°C resolution.
It features a programmable 2-wire (I²C-compatible) interface with 2-bit addressability (default slave address 0x58), hardware interrupt (INT) with per-source masking, remote reset (RST) with 20 ms minimum pulse width, and NAND TREE test logic for board-level connectivity verification - all operating across a 2.8V–5.75V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Resolution | 0.5°C LSB, 9-bit two's complement output (±125°C range) |
| Voltage Monitoring | 6 inputs: +12V, +5V, +3.3V, +2.5V, +VCCP1, +2.5VS/+VCCP2; scaled 8-bit delta-sigma ADC |
| Fan Inputs | 2 digital tachometer inputs (FAN1/FAN2); 8-bit counter with programmable divisor (1/2/4/8) |
| DAC Output | 8-bit voltage-controlled fan speed output (VOUT/NTIN), ~0–1.25 V range |
| Interface | 2-wire serial bus (I²C-compatible), 2-bit addressable (A0/A1), default slave address 0x58 |
| Interrupt Logic | Hardware INT output with per-function mask registers and software-clearable status (INT_Clear bit) |
| Supply Range | 2.8 V to 5.75 V - supports both 3.3 V and 5 V system rails without level-shifting |
Pinout & Package
DS1780E/T&R is housed in a 24-pin 173-mil thin shrink small-outline package (TSSOP), with separate analog (GNDA) and digital (GNDD) ground pins, dual-purpose pins (A0/NTOUT, VOUT/NTIN, RST), and dedicated voltage input channels (+xxVIN, VIDx).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0/NTOUT | Address I/O / NAND TREE output | LSB of 2-wire address; functions as open-drain output during NAND TREE board test |
| A1 | Address input | MSB of 2-wire address; sets upper bit of slave address (0x58–0x5B) |
| SDA | 2-wire bidirectional data | Open-drain I²C data line; requires external pull-up |
| SCL | 2-wire clock input | Synchronous clock input for serial communication |
| FAN1, FAN2 | Tachometer inputs | Digital inputs accepting 0–VDD pulses; internal 22.5 kHz gated timer with 8-bit counter |
| CHS | Chassis intrusion detector | Active-high latch input; retains state even when VDD = 0; internally pulled low via Config Bit 6 |
| VDD | Power supply | 2.8–5.75 V main supply; requires 10 µF + 0.1 µF bypass capacitors |
| INT | Interrupt output | Active-low open-drain interrupt; enabled via Config Register Bit 1; masks per source |
| VOUT/NTIN | DAC output / NAND TREE input | 8-bit DAC analog output (~0–1.25 V) or NAND TREE test input (when selected) |
| RST | Remote reset I/O | Bidirectional: accepts external reset; outputs 20 ms min active-low pulse when enabled (Config Bit 4) |
| GNDA | Analog ground | Reference for all analog inputs (+xxVIN, +2.5VS/+VCCP2); must be low-impedance |
| +2.5VS/+VCCP2 | Negative/processor voltage input | Measures -12V (with external resistor ladder) or +VCCP2 (0–3.6 V, 14.1 mV/LSB) |
| +xxVIN (pins 15–19) | Positive voltage inputs | Five dedicated analog inputs for +12V, +5V, +3.3V, +2.5V, +VCCP1 |
| VIDx (pins 20–24) | Processor VID readout | Digital inputs (VID0–VID4) reflecting processor-supplied voltage ID bits; unprocessed by DS1780 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensing | On-chip sensor eliminates need for external thermistor or diode; no calibration required |
| 6-channel voltage monitoring | Internal scaling and delta-sigma conversion enable accurate rail tracking without external dividers for +12V/+5V/+3.3V/+2.5V |
| Programmable fan control | 8-bit DAC output directly drives PWM fan controllers or linear fan drivers with precise speed setpoint |
| Chassis intrusion latching | Dual-state CHS pin retains intrusion event even during power-off, enabling BIOS-level security response |
| NAND TREE test logic | On-die combinational logic simplifies board-level continuity testing without external test fixtures |
| Wide supply compatibility | 2.8–5.75 V operation supports legacy 5 V and modern 3.3 V platforms without auxiliary regulators |
Applications
| Desktop PC Power Integrity Monitoring | Laptop Thermal Management System |
|---|---|
Use Scenario: Real-time supervision of ATX +12V, +5V, +3.3V rails and CPU core voltage (+VCCP1) in desktop motherboards. IC Role / Device Role / Timing Role: Central system monitor IC performing synchronized analog sampling and interrupt generation on rail deviation. Use Value: Enables immediate SMI-triggered shutdown or throttling when any monitored voltage exceeds ±5% tolerance, preventing component damage. | Use Scenario: Fan speed regulation and CPU die temperature tracking in space-constrained laptop baseboards. IC Role / Device Role / Timing Role: Dual-role device: reads thermal sensor and controls fan via DAC output while monitoring +VCCP1 and +3.3V. Use Value: Maintains acoustic noise below 28 dB(A) by dynamically adjusting fan speed based on real 0.5°C-resolution temperature feedback. |
| Industrial Embedded Controller Health Check | Server Blade Chassis Security Monitor |
Use Scenario: Continuous power and thermal surveillance in fan-cooled PLC controllers operating 24/7 at 60°C ambient. IC Role / Device Role / Timing Role: Standalone health monitor interfacing to host MCU via I²C; operates in low-power standby between 1-second sampling cycles. Use Value: Detects gradual +12V rail droop (>3%) over time and triggers predictive maintenance alert before brownout-induced reboot. | Use Scenario: Tamper detection and secure boot enforcement in multi-node server blades with removable covers. IC Role / Device Role / Timing Role: Chassis intrusion detector with non-volatile latching; CHS pin asserts high and remains asserted until cleared by firmware. Use Value: Prevents unauthorized physical access by halting boot sequence when CHS event is detected - even if blade was powered off during intrusion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU peripheral monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM92CIMM/NOPB | Single-channel temperature sensor only; no voltage/fan monitoring or DAC; 12-bit resolution | Only suitable for thermal-only monitoring; cannot replace DS1780E/T&R in full-system supervision | Select only when thermal sensing is sole requirement and board space allows separate voltage/fan ICs |
| ADM1027ASTZ | 12-bit temp, 6-voltage, 2-fan, 8-bit DAC, SMBus interface; supports 3.3 V only; no chassis intrusion input | Lacks CHS security feature and NAND TREE test logic; requires 3.3 V supply only | Use where SMBus compatibility and higher temp resolution are prioritized over intrusion detection and wide-VDD operation |
Compared with LM92CIMM/NOPB and ADM1027ASTZ, DS1780E/T&R uniquely combines chassis intrusion latching, NAND TREE testability, and 2.8–5.75 V supply flexibility - making it irreplaceable in cost-sensitive, security-aware PC and industrial motherboard designs requiring full-feature integration in one TSSOP package.
Availability
DS1780E/T&R is available at Aetrix Electronics and suitable for desktop PC motherboard manufacturing, laptop thermal subsystem design, industrial embedded controller health monitoring, and server blade chassis security implementation requiring stable component supply and long-term lifecycle support.
Supply support for DS1780E/T&R 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 (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The DS1780E/T&R belongs to Maxim's CPU Peripheral Monitor product line, engineered specifically for real-time, multi-rail power integrity and thermal supervision in x86-based personal computers and microprocessor-centric embedded systems.
FAQ
What is the primary function of the DS1780E/T&R in a PC motherboard?
The DS1780E/T&R serves as a centralized system health monitor on PC motherboards, concurrently measuring ambient temperature (0.5°C resolution), six power supply voltages (+12V to +VCCP1), two fan speeds, and chassis intrusion status - then generating hardware interrupts or DAC-based fan control signals. Its integration eliminates discrete sensors and reduces BOM count while enabling SMI-driven thermal/power fault response in the DS1780E/T&R's native 24-pin TSSOP footprint.
Does the DS1780E/T&R require external components for basic temperature and voltage monitoring?
No, the DS1780E/T&R performs direct-to-digital temperature sensing and internally scales all six voltage inputs - eliminating external thermistors, voltage dividers, or calibration circuitry for standard use cases. Only +12V and -12V monitoring require optional external resistors (for level translation), and VDD bypassing mandates a 10 µF + 0.1 µF capacitor pair. All core DS1780E/T&R monitoring functions operate autonomously after configuration via its 2-wire interface.
How does the DS1780E/T&R handle chassis intrusion detection when the system is powered off?
The DS1780E/T&R's CHS pin is designed as an active-high, latch-capable input that retains intrusion state even with VDD = 0 V. An external mechanical switch pulls CHS high upon case removal, and the DS1780E/T&R holds that event in its Chassis Intrusion Clear Register (0x46h) until firmware explicitly clears Bit 7. This enables BIOS-level tamper response at next power-on - a capability intrinsic to the DS1780E/T&R's architecture and not dependent on auxiliary power or super-I/O support.
What is the resolution and accuracy of voltage measurements on the DS1780E/T&R?
The DS1780E/T&R uses an 8-bit delta-sigma ADC with input-specific scaling: +12VIN has 62.5 mV/LSB (±0.3% full-scale error typical), +5VIN is 26.0 mV/LSB, +3.3VIN is 17.2 mV/LSB, and +VCCP1 is 14.1 mV/LSB (0–3.6 V range). Accuracy is specified as ±1.5% of reading over temperature, with no external calibration needed. These values are fixed per channel and documented in the DS1780E/T&R datasheet Tables 5 and 6 - not derived from generic ADC specs.
Can the DS1780E/T&R generate interrupts for individual monitored parameters?
Yes, the DS1780E/T&R supports independent interrupt masking per monitored function: analog voltage limits (6 channels), temperature high/low thresholds, fan speed low limits (FAN1/FAN2), and chassis intrusion. Each source maps to dedicated bits in Interrupt Mask Registers 1 (0x43h) and 2 (0x44h), allowing selective enabling/disabling. The hardware INT pin reflects only unmasked active conditions, and status is readable in Interrupt Status Registers 1 (0x41h) and 2 (0x42h) - a granular control scheme confirmed in the DS1780E/T&R's register map and interrupt operation section.
DS1780E/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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/T&R FAQ
1.How can I place an order for DS1780E/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1780E/T&R 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/T&R reliable?
The price and inventory of DS1780E/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1780E/T&R is usually 5 days.
3.What payment methods are accepted for DS1780E/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1780E/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1780E/T&R?
DS1780E/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1780E/T&R 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/T&R?
For technical support, including DS1780E/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1780E/T&R requirements.
6.How does Aetrix verify that DS1780E/T&R is sourced from the original manufacturer or authorized distributors?
All DS1780E/T&R 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/T&R meets industry standards.
7.What is the process for return or replacement of DS1780E/T&R?
All DS1780E/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1780E/T&R, 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/T&R part is unused and in its original packaging.
Return procedure for DS1780E/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1780E/T&R Tags
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