MCP3202-CI/ST - 12-Bit Dual-Channel SPI ADC | Microchip
N.º de pieza: MCP3202-CI/ST ✓ ActivoMCP3202-CI/ST Descripción general
An ADC is an integrated circuit that converts continuously varying analog voltages into numeric values that a microcontroller or other digital controller can process. The MCP3202 belongs to the SAR ADC hierarchy, where an internal sample-and-hold circuit captures the input voltage and a successive-approximation conversion produces a 12-bit code. This architecture is appropriate for relatively low-frequency measurements where low power consumption and a compact package are more important than maximum conversion throughput.
The MCP3202-CI/ST provides 12-bit conversion resolution, two analog input channels, a 2.7 V operating supply, and SPI communication. According to the manufacturer datasheet, its differential nonlinearity is specified to a maximum of 1 LSB and its integral nonlinearity to a maximum of 2 LSB. These characteristics establish the converter's nominal accuracy and help designers size the input range, analog front end, and software conversion scale.
The SAR architecture uses on-board sample-and-hold circuitry to stabilize the selected analog input during conversion. A microcontroller can configure the conversion through the serial interface, initiate a sample, receive the 12-bit result, and repeat the process for either channel. SPI support makes the MCP3202 practical for systems where the ADC shares a compact serial bus with other peripherals and where fewer external pins are preferable to a parallel interface.
Typical applications include industrial temperature and pressure sensing, potentiometer position measurement, battery voltage monitoring, laboratory data acquisition, and educational platforms connected to Arduino or Raspberry Pi boards. In each case, the analog signal should remain within the ADC input range, and the source impedance must be compatible with the sample-and-hold input arrangement.
A key design consideration is signal conditioning. The selected channel should be driven through a suitable low-impedance buffer when the sensor has high source impedance, while analog traces should be kept away from switching nodes and high-current paths. Firmware must also configure the channel and input mode before interpreting the returned 12-bit result.
This product page combines the manufacturer specifications, package and pin information, application guidance, and qualified same-footprint alternatives. It also highlights the electrical limits that determine whether the MCP3202-CI/ST is appropriate for a new embedded measurement design.
Alternativas directas para MCP3202-CI/ST — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MCP3202-CI/ST (mismo factor de forma y huella) — difiere en Package, Architecture, Resolution, Supply Voltage.
MCP3202T-CI/ST
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP3202-CI/ST Valores máximos y características eléctricas
| Converter Type | 12-bit SAR analog-to-digital converter |
| Number of Analog Input Channels | 2 channels |
| Resolución | 12 bits |
| Tensión de alimentación | 2.7 V |
| Digital Interface | SPI |
| Architecture | Successive approximation register |
| Sample-and-Hold Circuitry | On-board |
| Differential Nonlinearity | Maximum 1 LSB |
| Integral Nonlinearity | Maximum 2 LSB |
| Encapsulado | 8-pin TSSOP |
| Tipo de montaje | Surface mount |
Configuración de pines de MCP3202-CI/ST
| Pin 1 | VREF- — Negative reference input |
| Pin 2 | AN0 — Analog input channel 0 |
| Pin 3 | AN1 — Analog input channel 1 |
| Pin 4 | VREF+ — Positive reference input |
| Pin 5 | GND — Ground connection |
| Pin 6 | DIN — Serial data input |
| Pin 7 | DOUT — Serial data output |
| Pin 8 | CS/SHDN — Chip select and shutdown control input |
Aplicaciones típicas
MCP3202-CI/ST es adecuado para 6 aplicacións: Industrial Sensor Acquisition, Raspberry Pi Sensor Interface, Arduino Control Platform, Battery Voltage Monitoring, Laboratory Data Acquisition, Position and Potentiometer Measurement.
Industrial Sensor Acquisition
The MCP3202-CI/ST fits compact industrial sensor modules that must measure two analog quantities with a microcontroller while conserving board area. Its 12-bit SAR resolution provides 4096 digital codes across the selected input range, and the on-board sample-and-hold circuitry captures each channel before conversion. The SPI interface also reduces the number of host-controller connections compared with a parallel ADC. Buffer high-impedance sensors and keep analog routing away from switching power nodes to preserve measurement quality.
Recomendado
Raspberry Pi Sensor Interface
The MCP3202-CI/ST is practical for Raspberry Pi projects requiring two analog inputs through SPI. Its 12-bit conversion resolution is useful for potentiometers, resistive sensors, and conditioned analog sensors where discrete digital values are sufficient. The 8-pin TSSOP package supports compact custom sensor boards, while the SPI interface allows a Python or other host application to select a channel and retrieve a conversion result. Verify the host's logic levels and configure the reference and input range correctly.
Recomendado
Arduino Control Platform
The MCP3202-CI/ST can add two 12-bit analog channels to an Arduino-compatible controller, allowing potentiometer controls, light sensors, or conditioned process-voltage measurements to be read over SPI. Its successive-approximation architecture and on-board sample-and-hold function support deterministic digital acquisition. Use appropriate voltage conditioning when sensor outputs exceed the ADC input limits, and select SPI pin mappings that do not conflict with programming or bootloader functions.
Recomendado
Battery Voltage Monitoring
The MCP3202-CI/ST can monitor a divided battery voltage in a low-power embedded system and report the measurement to a microcontroller through SPI. Two inputs allow the same board to track battery voltage alongside another slowly changing analog quantity. A resistor divider and input filtering network help constrain the measured voltage and limit high-frequency noise before the sample-and-hold input. Firmware should apply the divider ratio before converting the 12-bit code into a system voltage.
Recomendado
Laboratory Data Acquisition
The MCP3202-CI/ST can provide a compact two-channel analog input stage for laboratory or educational instrumentation. Its 12-bit SAR conversion, specified maximum differential nonlinearity of 1 LSB, and maximum integral nonlinearity of 2 LSB make it appropriate for general-purpose measurements rather than precision metrology. Use stable references, buffered inputs, and short analog traces. For signals requiring faster acquisition, simultaneous sampling, or laboratory-grade accuracy, select a more specialized converter.
Recomendado
Position and Potentiometer Measurement
The MCP3202-CI/ST is well suited to reading potentiometer positions or other slowly varying analog controls because the two channels can represent independent axes or control elements. The 12-bit result provides 4096 nominal code positions, which is useful for basic human-interface controls, while the serial interface keeps wiring compact. Limit switch-contact noise with suitable input filtering and avoid routing the analog trace beside high-current motor or relay wiring.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCP3202-CI/ST — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCP3202T-CI/ST |
|---|---|---|
| Package | 8-pin TSSOP | 8-pin TSSOP |
| Brand | Microchip Technology | Microchip Technology |
| Resolution | 12 bits | 12 bits |
| Analog Input Channels | 2 channels | 2 channels |
| Converter Architecture | Successive approximation register | Successive approximation register |
| Supply Voltage | 2.7 V | 2.7 V |
| Digital Interface | SPI | SPI |
| Sample-and-Hold Circuitry | On-board | On-board |
Diferenciadores clave
- Combines two analog channels with a 12-bit SAR converter in an 8-pin TSSOP (frente a MCP3202T-CI/ST)
- Serial interface reduces host connection count (frente a MCP3202T-BI/SN)
- Compact choice for two-channel embedded measurement (frente a ADS1254E)
Notas de diseño
Place the MCP3202-CI/ST close to the sources of AN0, AN1, VREF+, and VREF-. Keep the analog traces short, route them away from switching-node copper, and use a continuous ground plane beneath the analog section. Place filtering capacitors close to their associated pins, and connect the reference network with low loop area. These layout measures reduce susceptibility to switching converter ripple and high-impedance noise pickup during the sample-and-hold interval.
Check the source impedance of each connected sensor against the acquisition requirements in the Microchip Technology manufacturer datasheet. Add a low-noise buffer when the sensor cannot charge the sample-and-hold capacitor quickly enough, and place any anti-alias filter capacitor close to the analog input. A resistor between the source and AN0 or AN1 can also limit transient current, but its value must be selected without introducing unacceptable settling error.
Do not assume that any MCP3202-family ordering suffix is mechanically interchangeable. The CI/ST target uses an 8-pin TSSOP package, while MCP3202T-BI/SN uses a different package suffix. Verify the physical drawing, pin numbering, reference connection, analog input limits, temperature grade, and qualification status before substituting a part. Firmware should also avoid reusing stale conversions by following the conversion sequence and CS/SHDN timing specified by the manufacturer.
Información de cumplimiento
Compliance declarations for the exact MCP3202-CI/ST ordering code were not identified. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and AEC-Q100 status with Microchip Technology before production release.
