NXP Semiconductors SA56004DD,112

Overview

SA56004DD,112 from NXP Semiconductors is an SMBus-compatible 11-bit remote/local digital temperature sensor with dual overtemperature alarms (ALERT and T_CRIT), ±1 °C remote diode accuracy, and programmable conversion rates from 0.0625 Hz to 26 Hz. It monitors microprocessor thermal diodes or discrete transistors (e.g., 2N3904/2N3906) in server motherboard thermal management systems.

For engineers reviewing the SA56004DD,112 datasheet, SA56004DD,112 pinout, SA56004DD,112 application, or SA56004DD,112 equivalent, key selection considerations include its SO8 package, 3.0–3.6 V supply range, SMBus 2.0 TIMEOUT support, factory-trimmed 7-bit slave address (1001 011), and open-drain ALERT/T_CRIT outputs requiring external pull-ups.

Technical Context

The SA56004DD,112 integrates a Σ-Δ A/D converter with dual sensing paths: on-chip local sensor (±2 °C accuracy) and remote diode interface (D+, D−) with offset compensation registers. Its register map includes dedicated high/low/T_CRIT limit registers for both channels, status flags for fault detection (e.g., OPEN, BUSY), and configuration bits for RUN/STOP control and interrupt masking.

It implements SMBus 2.0 protocol compliance with TIMEOUT protection and supports I²C Standard/Fast-mode. The device uses two's complement 11-bit format (LSB = 0.125 °C) for remote/local temperature data, while T_CRIT and setpoint registers use 8-bit format (LSB = 1.0 °C), enabling precise thermal thresholding across −40 °C to +125 °C operating range.

Key Specifications

Pinout & Package

SA56004DD,112 is supplied in the SO8 package (SOT96-1), plastic small outline, 8-lead, 3.9 mm body width, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar remote/local digital temperature sensor applications.

Compared with LM86CIMM/NOPB and MAX6657ESA+, the SA56004DD,112 delivers superior remote accuracy (±1 °C vs. ±2 °C), SMBus TIMEOUT protection for system-level robustness, and full remote offset calibration - making it the preferred choice for high-reliability server and industrial thermal management where precision and fault resilience are critical.

Availability

SA56004DD,112 is available at Aetrix Electronics and suitable for server motherboard thermal management, laptop GPU protection, industrial PLC cabinet monitoring, and network switch ASIC thermal control requiring stable component supply across extended temperature ranges.

Supply support for SA56004DD,112 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communications markets.

The SA56004X product line was designed specifically for high-accuracy, multi-point thermal monitoring in enterprise computing platforms - emphasizing SMBus reliability, remote diode interface fidelity, and seamless integration with baseboard management controllers.

FAQ

What is the factory-programmed SMBus slave address for SA56004DD,112?

The SA56004DD,112 has a factory-programmed 7-bit SMBus slave address of 1001 011 (0x4B in hexadecimal), as defined in Table 4 of the NXP datasheet. This address is stored in OTP memory and cannot be modified. It enables up to eight SA56004X devices to coexist on the same SMBus without conflict, provided each uses a distinct address variant (e.g., SA56004AD = 0x48, SA56004BD = 0x49).

Does SA56004DD,112 support both SMBus and I²C interfaces?

Yes, SA56004DD,112 is fully compatible with SMBus 2.0 (including TIMEOUT protocol) and I²C Standard-mode (100 kHz) and Fast-mode (400 kHz). Its SDATA and SCLK pins implement open-drain logic with internal level-shifting, allowing interoperability with standard I²C masters while retaining SMBus-specific features like Alert Response Address (ARA) and packet error checking.

How does the remote diode sensing accuracy of SA56004DD,112 achieve ±1 °C?

The SA56004DD,112 achieves ±1 °C remote accuracy through factory trimming of its D+ current source and internal ADC gain/offset, combined with on-chip compensation algorithms. This specification applies across −40 °C to +125 °C when used with standard silicon diodes (e.g., 2N3904) or microprocessor substrate PNP junctions, and assumes proper PCB layout with matched D+/D− trace lengths and minimal noise coupling.

Can SA56004DD,112 operate outside the 3.0–3.6 V supply range?

No - SA56004DD,112 is specified only for 3.0 V to 3.6 V operation. Although the absolute maximum rating for VDD is 5.5 V, functionality including temperature accuracy, SMBus communication, and alarm assertion is guaranteed exclusively within the 3.0–3.6 V range. Operation below 3.0 V triggers undervoltage lockout (UVLO), disabling measurements until supply stabilizes.

What is the purpose of the T_CRIT output on SA56004DD,112?

The T_CRIT output on SA56004DD,112 is an open-drain, active-low signal that asserts when either the local or remote temperature exceeds its independently programmable T_CRIT threshold register value. It is intended for safety-critical actions such as initiating system shutdown, activating emergency cooling fans, or latching hardware reset circuits - distinct from the general-purpose ALERT output used for non-critical thermal warnings.