Texas Instruments LM70CILDX-5

Overview

LM70CILDX-5 from Texas Instruments is a SPI/MICROWIRE-compatible 10-bit plus sign digital temperature sensor in an 8-pin WSON package, delivering 0.25°C resolution over −55°C to +150°C, with 2.65V–5.5V supply range and shutdown current ≤12 µA. It serves as a system-level thermal monitoring device in disk drives and embedded controllers.

For engineers reviewing the LM70CILDX-5 datasheet, LM70CILDX-5 pinout, LM70CILDX-5 application, or LM70CILDX-5 equivalent, this page provides verified technical context, real-world interface timing, thermal accuracy bands across operating ranges, and validated alternatives for thermal sensing in space-constrained industrial and computing systems.

Technical Context

The LM70CILDX-5 integrates a band-gap temperature sensor and ΔΣ ADC, outputting 11-bit two's complement data (1 sign + 10 temperature bits) with LSB = 0.25°C. Its serial interface operates in SPI or MICROWIRE mode using three wires: SI/O (bidirectional), SC (Schmitt-trigger clock), and CS (active-low chip select).

It supports continuous conversion and shutdown modes via write-only configuration register; shutdown is entered by writing FFh and draws ≤12 µA typical. The device powers up in continuous mode and outputs manufacturer ID (0x8140) when in shutdown, confirming TI origin and part identity.

Key Specifications

Pinout & Package

LM70CILDX-5 uses the NGK 8-pin WSON package (2.0 mm × 2.0 mm, 0.65 mm pitch, exposed thermal pad). Pin mapping is identical to LM70CILD-5 per TI package drawing NGK0008A.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensing applications.

Compared with MAX6602ASA+ and ADT7301ARMZ, LM70CILDX-5 offers optimal balance of SPI compatibility, ultra-small WSON-8 size, and proven low-power shutdown - making it preferred for space- and power-constrained thermal monitoring where 0.25°C resolution suffices.

Availability

LM70CILDX-5 is available at Aetrix Electronics and suitable for hard disk drives, industrial PLCs, and server power supply units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for LM70CILDX-5 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and industrial-grade IC design.

The LM70 series was designed specifically for embedded thermal monitoring in space-constrained, low-power systems - emphasizing SPI interoperability, wide temperature range, and minimal external component count.

FAQ

What is the supply voltage range supported by LM70CILDX-5?

The LM70CILDX-5 operates from 2.65V to 5.5V, covering both 3.3V and 5V logic domains without external regulation. This range is validated across its full −55°C to +150°C operating temperature span, with accuracy specifications including effects of ±5% supply variation.

Does LM70CILDX-5 require external components for basic operation?

Yes - a 0.1 µF ceramic bypass capacitor is required between V+ and GND, placed as close as possible to the LM70CILDX-5 pins. No external resistors, pull-ups, or level shifters are needed for SPI communication, as all digital inputs include Schmitt triggers and the SI/O pin is tri-state capable.

How does shutdown mode function in LM70CILDX-5?

LM70CILDX-5 enters shutdown mode when the host writes FFh to its configuration register via SPI. In shutdown, supply current drops to ≤12 µA typical, and the SI/O pin outputs the manufacturer ID (0x8140) on subsequent reads. The serial interface remains active, allowing wake-up via CS assertion and command write.

What is the meaning of "LM70CILDX-5" in the part number?

"LM70" denotes the base product family; "CI" indicates commercial-industrial grade (−55°C to +150°C); "LDX" specifies WSON-8 package with tape-and-reel delivery (4500 pcs/reel); "-5" confirms 4.5V–5.5V optimized accuracy bin - matching the LM70-5 specification subset in the datasheet.

Can LM70CILDX-5 be used with a microcontroller lacking hardware SPI?

Yes - LM70CILDX-5 supports bit-banged SPI communication due to its defined timing margins (e.g., t2 ≥ 100 ns setup, t6 ≥ 60 ns hold). Its Schmitt-triggered SC and SI/O inputs tolerate slow edges, enabling reliable operation with GPIO-based software SPI on MCUs like PIC16 or low-end ARM Cortex-M0+ devices.