Microchip Technology MCP3002T-I/ST

Overview

MCP3002T-I/ST from Microchip Technology is a 10-bit successive approximation analog-to-digital converter (ADC) with on-chip sample-and-hold, SPI serial interface (modes 0,0 and 1,1), single-supply operation (2.7V–5.5V), ±1 LSB INL/DNL, and industrial temperature range (–40°C to +85°C). It supports dual single-ended or pseudo-differential input configurations and is used in sensor interface and battery-operated data acquisition systems.

For engineers reviewing the MCP3002T-I/ST datasheet, MCP3002T-I/ST pinout, MCP3002T-I/ST application, or MCP3002T-I/ST equivalent, key selection criteria include its 200 ksps max sampling rate at 5V, 8-pin TSSOP package, SPI timing compatibility with MCU hardware ports, and low-power standby current of 5 nA.

Technical Context

The MCP3002T-I/ST implements a SAR architecture with internal 20 pF sample capacitor and 1.5 clock-cycle acquisition time starting on the second rising CLK edge after the start bit. Conversion completes in 10 clock cycles, with output data shifted out MSB-first on DOUT falling edges.

It uses VDD as the reference voltage, enabling straight-binary coding and supporting both single-ended (CH0/CH1 referenced to VSS) and pseudo-differential modes (IN+/IN− with IN− limited to ±100 mV from VSS). Channel configuration is set via SGL/DIFF and ODD/SIGN bits in the SPI command sequence.

Key Specifications

Pinout & Package

Package: 8-pin TSSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADS7822IDR and MCP3202-I/P, the MCP3002T-I/ST offers optimal balance of ultra-low standby power (5 nA), integrated VDD-referenced operation, and compact TSSOP packaging - making it preferred for battery longevity and miniaturized embedded systems where 10-bit resolution suffices.

Availability

MCP3002T-I/ST is available at Aetrix Electronics and suitable for sensor interface, process control, and battery-operated data acquisition requiring stable component supply and long-term industrial availability.

Supply support for MCP3002T-I/ST 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

Microchip Technology is a leading provider of microcontrollers, analog, and Flash-IP solutions, emphasizing reliability, low-power design, and broad ecosystem support.

The MCP3002T-I/ST belongs to Microchip's precision analog product line, engineered specifically for cost-sensitive, low-power embedded systems requiring robust 10-bit data conversion without external references or complex support circuitry.

FAQ

What is the maximum sampling rate of the MCP3002T-I/ST at 3.3V supply?

The MCP3002T-I/ST achieves a maximum sampling rate of 125 ksps at 3.3V, interpolated from the specified 200 ksps at 5V and 75 ksps at 2.7V per DS21294E. This rate assumes proper clock timing, low source impedance (<1 kΩ), and ambient temperature ≤70°C to maintain charge on the internal 20 pF sample capacitor.

Does the MCP3002T-I/ST require an external voltage reference?

No, the MCP3002T-I/ST uses VDD as its reference voltage - pin 8 (VDD/VREF) serves both power and reference functions. This eliminates the need for external reference ICs, reduces BOM cost and board area, and avoids reference drift errors, though full-scale range scales directly with supply voltage.

How does pseudo-differential mode work on the MCP3002T-I/ST?

In pseudo-differential mode, CH0 acts as IN+ and CH1 as IN−, with the output code representing (IN+ − IN−) × 1024 / VDD. IN− must remain within ±100 mV of VSS to avoid code wraparound; this mode rejects common-mode noise present on both inputs while retaining single-ended simplicity in routing and biasing.

What is the purpose of the CS/SHDN pin on the MCP3002T-I/ST?

The CS/SHDN pin on the MCP3002T-I/ST serves dual functions: pulling it low initiates SPI communication and starts conversion, while pulling it high disables the digital output driver and places the device in 5 nA standby mode - enabling precise power gating between samples in battery-powered applications.

Can the MCP3002T-I/ST interface directly with a 3.3V microcontroller SPI port?

Yes, the MCP3002T-I/ST is fully compatible with 3.3V MCU SPI ports: its VIH is 0.7×VDD (min 2.31V at 3.3V) and VIL is 0.3×VDD (max 0.99V), matching standard 3.3V logic thresholds. It supports SPI modes 0,0 and 1,1, and operates down to 2.7V, ensuring robust communication without level shifters.