My Inquiry
My Account
Texas Instruments LMP91300NHZT
- Part No.:
- LMP91300NHZT
- Manufacturer:
- Texas Instruments
- Category:
- Analog Front End (AFE)
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LMP91300NHZT.pdf
- Description:
- IC AFE 1 CHAN 16BIT 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMP91300NHZT from Texas Instruments is an industrial-grade analog front end (AFE) IC designed specifically for inductive proximity sensors. It directly converts the resistance-to-parallel (RP) impedance of an external LC tank into a 16-bit digital value, supports programmable detection thresholds (798 Ω to 3.93 MΩ), operates from 6.5 V to 40 V loop supply, and delivers NPN/PNP 3-wire output switching with integrated LED driver - enabling robust metal detection in factory automation systems.
For engineers reviewing the LMP91300NHZT datasheet, LMP91300NHZT pinout, LMP91300NHZT application, or LMP91300NHZT equivalent, key selection considerations include its RP-to-digital conversion architecture, digital temperature compensation using external NTC, programmable oscillator frequency (5 kHz–5 MHz), overload protection via external SENSE resistor, and WQFN-24 package compatibility with 4 mm × 5 mm industrial sensor housings.
Technical Context
The LMP91300NHZT implements a direct RP-to-digital converter architecture that eliminates analog-to-digital conversion errors associated with traditional amplitude- or frequency-based sensing. Its internal oscillator sustains stable amplitude across the full RP range (798 Ω–3.93 MΩ) and supports programmable oscillation frequencies from 5 kHz to 5 MHz via external CFA/CFB capacitors.
Detection logic uses digitally compensated RP values referenced against programmable high/low thresholds (16-bit resolution) with independent hysteresis control. Temperature compensation relies on a calibrated 2-byte-per-4°C Look-Up Table (registers 0x00–0x5D), optimized for Murata NCP03WF104F05RL (β = 4250) NTC sensors, and applies linear interpolation for 1°C resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.5 V to 40 V loop supply - powers device directly from industrial 2-wire or 3-wire sensor loop without auxiliary rail. |
| RP Detection Range | 798 Ω to 3.93 MΩ - defines minimum/maximum detectable LC tank impedance, setting physical sensing distance limits. |
| Oscillation Frequency | 5 kHz to 5 MHz - programmable via external CFA/CFB capacitors; determines coil size, resolution, and EMI profile. |
| Output Driver Current | 2 mA to 11 mA (4 settings) - configurable SWDRV sink/source strength for driving external NPN/PNP transistors reliably. |
| Overcurrent Threshold | 310 mV ±31 mV (PNP/NPN) - voltage drop across external RSENSE triggering short-circuit protection and duty-cycled switching. |
| Temperature Accuracy | ±2.5 °C (LMP91300 only, excludes NTC error) - enables stable threshold calibration across −40 °C to +125 °C operating range. |
| LED Drive Current | 2.5 mA or 5 mA - programmable sink current for status-indicating red/green LEDs without external driver circuitry. |
Pinout & Package
Package: 24-terminal WQFN (4 mm × 5 mm, 0.5 mm pitch), thermally enhanced with exposed DAP (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+/EXT E (Pin 8) | Power input / transistor emitter connection | Accepts 6.5–40 V loop supply; also serves as emitter node for external PNP transistor in 3-wire configuration. |
| EXT B (Pin 9) | Transistor base drive | Provides controlled current to external transistor base; enables direct NPN/PNP interface without level-shifting. |
| SWDRV (Pin 10) | Switch driver output | Sinks/sourced current (2–11 mA) to drive external transistor collector/drain; includes short-circuit duty-cycle control. |
| SENSE− (Pin 11), SENSE1+ (Pin 12), SENSE2+/SWIF RX (Pin 13) | Differential sense inputs / SWIF receive | Acquires RP-modulated signal from LC tank; Pin 13 doubles as Single-Wire Interface (1–10 kbps) receive line. |
| INA / INB (Pins 20/21) | LC tank connection | Direct interface to external inductor-capacitor resonator; determines oscillation frequency and target sensitivity. |
| TEMP+ / TEMP− (Pins 23/22) | NTC temperature sensor interface | Reads analog voltage from external NTC (e.g., Murata NCP03WF104F05RL); enables digital compensation of RP drift. |
| LED (Pin 7) | LED driver output | Sinks 2.5 mA or 5 mA to drive status LED; blinks at 2 Hz during short-circuit or ECC error conditions. |
| CBY (Pin 24) | Bypass capacitor terminal | Requires 56 nF ceramic capacitor to stabilize internal LDO regulator; critical for noise immunity in industrial environments. |
Key Features
| Feature | Design Value |
|---|---|
| Post-production configuration & calibration | Firmware-programmable thresholds, hysteresis, oscillator amplitude (1/2/4 VPP), and response time (96–6144 periods) via SWIF interface. |
| Digital temperature compensation | Uses user-calibrated 48-entry LUT (−48 °C to +136 °C in 4 °C steps) with linear interpolation for 1 °C accuracy - eliminates analog compensation networks. |
| Flexible overload protection | Detects >310 mV across RSENSE and enforces 0.1% or 0.8% duty cycle on SWDRV (30 µs ON) to limit average power during sustained shorts. |
| Integrated LED driver | Configurable 2.5/5 mA sink with programmable on/off state per output mode (NO/NC), plus automatic blink-on-fault behavior. |
| 3-wire PNP/NPN support | Single IC supports both industrial wiring standards via register-controlled EXT B/SWDRV polarity and V+/EXT E routing. |
Applications
| Industrial Proximity Detection | Factory Automation Sensors |
|---|---|
Use Scenario: Detecting presence/absence of steel parts on high-speed conveyor belts in automotive assembly lines. IC Role / Device Role / Timing Role: AFE performs RP-to-digital conversion of LC tank impedance shift caused by metal proximity; triggers NPN/PNP switch output within ≤6144 oscillator periods (≤12.3 ms at 500 kHz). Use Value: Enables sub-millimeter repeatable detection without mechanical contact, supporting IP67-rated 4 mm × 5 mm sensor housings with no external ADC or microcontroller required. |
Use Scenario: Monitoring cylinder piston position in pneumatic control valves within chemical processing plants. IC Role / Device Role / Timing Role: Digitally compensates for ambient temperature drift (−40 °C to +125 °C) using external NTC and internal LUT, maintaining consistent switching thresholds across thermal cycles. Use Value: Eliminates manual recalibration during seasonal temperature swings, reducing maintenance downtime and improving process repeatability. |
| Industrial Production Lines | Material Handling Systems |
Use Scenario: Verifying correct placement of stamped metal brackets before robotic welding in Tier-1 supplier facilities. IC Role / Device Role / Timing Role: Configures programmable hysteresis (via DET_L_MSB/LSB registers) to reject vibration-induced false triggers while retaining fast response to actual part arrival. Use Value: Reduces scrap rate by ensuring weld initiation only occurs when part is fully seated - no firmware update or hardware change needed for new bracket designs. |
Use Scenario: Sensing pallet location at transfer points in automated warehouse sortation systems. IC Role / Device Role / Timing Role: Drives external PNP transistor (via EXT B/SWDRV) to interface with legacy PLC 24 V DC inputs; LED indicates active state with 2 Hz fault blink on overload. Use Value: Provides plug-compatible replacement for discrete proximity sensor modules, cutting BOM count and board space by integrating AFE, driver, and protection in one WQFN-24 package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inductive proximity sensor AFE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS3933-BTST | RF-based ASK receiver IC; no integrated RP-to-digital converter or LC oscillator - requires external RF front end and microcontroller. | Designed for wireless wake-up and low-power proximity in battery-operated devices, not industrial 24 V loop-powered sensors. | Select only if system requires sub-µA sleep current and wireless wake-up capability; not suitable for direct replacement in wired industrial proximity nodes. |
| MAX1452ACM+ | Analog signal conditioner with PGA, DAC, and EEPROM; lacks integrated oscillator, digital temperature LUT, or SWDRV output driver. | Targeted at strain-gauge and RTD sensor conditioning; requires external MCU for RP calculation and decision logic. | Choose when conditioning non-inductive sensors (e.g., pressure transducers) with high-precision analog trimming - not a functional substitute for LMP91300NHZT's integrated proximity AFE architecture. |
Compared with AS3933-BTST and MAX1452ACM+, the LMP91300NHZT uniquely integrates LC oscillator, RP-to-digital conversion, digital temperature compensation LUT, and 3-wire output driver in a single industrial-grade IC - eliminating external microcontrollers, ADCs, and discrete protection components required by alternatives.
Availability
LMP91300NHZT is available at Aetrix Electronics and suitable for industrial proximity detection, factory automation sensors, and material handling systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMP91300NHZT 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and industrial interface solutions.
The LMP91300NHZT belongs to TI's Industrial Analog Front End product line, engineered specifically to replace discrete proximity sensor signal chains with a single-chip solution supporting programmable RP detection, digital temperature compensation, and robust 3-wire output interfacing.
FAQ
What is the primary function of the LMP91300NHZT in an inductive proximity sensor design?
The LMP91300NHZT serves as a complete analog front end that directly converts the resistance-to-parallel (RP) impedance of an external LC tank into a 16-bit digital value. It performs digital temperature compensation using an external NTC sensor, compares the result against programmable thresholds, and drives an external NPN or PNP transistor via its SWDRV and EXT B pins - all within a single WQFN-24 package. This eliminates the need for external microcontrollers, ADCs, or analog compensation circuitry in industrial proximity sensor modules.
Does the LMP91300NHZT support both NPN and PNP 3-wire configurations?
Yes, the LMP91300NHZT natively supports both NPN and PNP 3-wire configurations through register-controlled output polarity and pin functionality. Pins V+/EXT E and EXT B route to the external transistor's emitter and base respectively, while SWDRV provides current-sinking or sourcing capability (2–11 mA) to drive the collector or drain. Configuration is performed via the OUT_CONFIG_INIT and OUT_CONFIG_FNL registers, allowing field reprogramming without hardware changes.
How does the LMP91300NHZT implement temperature compensation without external analog components?
The LMP91300NHZT implements digital temperature compensation using a user-calibrated 48-entry Look-Up Table (LUT) stored in registers 0x00–0x5D. This LUT maps temperature (−48 °C to +136 °C in 4 °C increments) to gain correction factors applied to RP measurements. The IC reads voltage from an external NTC (e.g., Murata NCP03WF104F05RL), interpolates between LUT entries for 1 °C resolution, and adjusts the RP-to-digital conversion result before threshold comparison - removing the need for analog thermistors, op-amps, or trim pots.
What protection features does the LMP91300NHZT provide against output short circuits?
The LMP91300NHZT provides integrated overload protection by monitoring voltage across an external SENSE resistor (RSENSE). When the drop exceeds ~310 mV, it enters short-circuit mode and toggles SWDRV with a programmable duty cycle (0.1% or 0.8%, i.e., 30 µs ON per cycle). This limits average current to I = 480 mV / RSENSE and prevents thermal damage to the external transistor. Recovery occurs automatically once the SENSE voltage falls below threshold.
Can the LMP91300NHZT be used with LC tanks outside the specified 5 kHz–5 MHz oscillation range?
No - the LMP91300NHZT's oscillator architecture is validated and characterized only for external LC tanks producing oscillation frequencies between 5 kHz and 5 MHz. Operation outside this range may cause unstable RP measurement, increased noise susceptibility, or failure to meet timing specifications for response time (tRESP) and recovery (trec). The CFA and CFB pins accept external capacitors to tune frequency within this band, but no guarantee is provided for operation beyond it.
LMP91300NHZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- package:
- 24-WFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Number of Channels:
- 1
- Power (Watts):
- -
- Voltage - Supply, Analog:
- 6.5V ~ 40V
- Voltage - Supply, Digital:
- 6.5V ~ 40V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LMP91300NHZT FAQ
1.How can I place an order for LMP91300NHZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMP91300NHZT 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 LMP91300NHZT reliable?
The price and inventory of LMP91300NHZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMP91300NHZT is usually 5 days.
3.What payment methods are accepted for LMP91300NHZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMP91300NHZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMP91300NHZT?
LMP91300NHZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMP91300NHZT 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 LMP91300NHZT?
For technical support, including LMP91300NHZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMP91300NHZT requirements.
6.How does Aetrix verify that LMP91300NHZT is sourced from the original manufacturer or authorized distributors?
All LMP91300NHZT 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 LMP91300NHZT meets industry standards.
7.What is the process for return or replacement of LMP91300NHZT?
All LMP91300NHZT units undergo pre-shipment inspection (PSI). If there is an issue with LMP91300NHZT, 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 LMP91300NHZT part is unused and in its original packaging.
Return procedure for LMP91300NHZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMP91300NHZT Tags
-
MCP3911A0-E/SS
Microchip Technology
-
ADS131A04IPBSR
Texas Instruments
-
ADS1292RIPBSR
Texas Instruments
-
ADS1292IRSMT
Texas Instruments
-
LMP90097MHE/NOPB
Texas Instruments
-
AD5940BCBZ-RL
Analog Devices Inc.
-
AD5940BCBZ-RL7
Analog Devices Inc.
-
AD5941BCPZ-RL7
Analog Devices Inc.
-
AD5941BCPZ
Analog Devices Inc.
-
ADS131E08IPAGR
Texas Instruments
-
LMP90100MH/NOPB
Texas Instruments
-
LMP90100MHE/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
