MCP3202-CI/MS - 12-Bit Dual-Channel SPI ADC | Microchip
MPN： MCP3202-CI/MS ✓ 啟用中MCP3202-CI/MS 概覽
An ADC is an analog-to-digital converter, a data-acquisition IC that samples a continuous voltage and produces a numeric code for processing by a microcontroller or other digital controller. The MCP3202 belongs to the SAR ADC family and includes an internal sample-and-hold circuit. Its SPI interface allows a host processor to configure and read conversions while the converter remains compact and suitable for embedded control systems.
The device provides 12-bit conversion resolution, two analog input channels, and an SPI-compatible serial interface in an 8-MSOP package. According to the Microchip manufacturer datasheet, operating current is typically 375 µA during active conversion and standby current is typically 500 nA. These characteristics make the converter suitable for portable instruments, industrial monitoring equipment, battery-powered controls, and low-power embedded data acquisition.
The SAR architecture performs conversion by successively approximating the input voltage with internal capacitor-based comparisons. An on-board sample-and-hold circuit captures the input during the sampling interval, allowing the conversion process to operate from a held voltage. Serial communication uses SCLK, DIN, CS, and DOUT lines, with the exact operating sequence governed by the converter's control logic in the manufacturer datasheet.
Typical applications include potentiometer and position measurement, temperature-sensor conditioning, current monitoring, industrial process control, and low-power embedded instrumentation. The two input channels can monitor two related analog quantities, while the SPI interface reduces the number of required signal lines and allows sharing with other serial peripherals when chip-select control is implemented correctly.
For a new design, preserve the 8-MSOP footprint, verify the reference-voltage limits, and select input and reference capacitors according to the application’s noise requirements. Supply and reference grounds should be routed carefully to reduce conversion error, while the analog input pins should remain short, quiet, and physically separated from fast-switching nodes wherever the PCB layout permits.
This page combines manufacturer specifications, practical embedded-conversion guidance, package and interface details, sourcing information, and validated substitute-analysis results for engineers designing around the MCP3202-CI/MS.
直接替換替代品，適用於 MCP3202-CI/MS — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MCP3202-CI/MS 最大額定值與電氣特性
| Converter Type | Successive approximation register ADC |
| 解析度 | 12 bit |
| Number of Analog Input Channels | 2 channels |
| Input Configuration | 2 single-ended inputs |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Maximum Conversion Rate at 5 V | 100 ksps |
| Maximum Conversion Rate at 2.7 V | 50 ksps |
| Digital Interface | SPI-compatible serial interface |
| Sample-and-Hold Circuit | On-board |
| Typical Active Current | 375 µA |
| Typical Standby Current | 500 nA |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 8-MSOP |
| 安裝類型 | Surface mount |
MCP3202-CI/MS 腳位配置
| 腳位 1 | CS — Chip-select input for the serial interface |
| 腳位 2 | DIN — Serial data input |
| 腳位 3 | SCLK — Serial clock input |
| 腳位 4 | VSS — Ground connection |
| 腳位 5 | D0 — Analog input channel 0 |
| 腳位 6 | D1 — Analog input channel 1 |
| 腳位 7 | VREF — Reference voltage input |
| 腳位 8 | VDD — Positive supply voltage input |
典型應用
MCP3202-CI/MS 適用於 6 應用s: Potentiometer and Position Measurement, Temperature and Analog Sensor Acquisition, Industrial Process Control, Battery-Powered Portable Instruments, Embedded Data Acquisition Modules, Current and Power Monitoring.
Potentiometer and Position Measurement
The MCP3202-CI/MS suits two-channel potentiometer or position sensing because it combines 12-bit resolution with conversion rates up to 100 ksps at 5 V. Place one analog input on each wiper and drive the resistive divider from the same supply domain as the ADC. The internal sample-and-hold circuit captures each input, while the SPI interface transfers results through SCLK, DIN, CS, and DOUT. This allows a microcontroller to sample position continuously without occupying many parallel bus lines. The main design consideration is keeping the analog traces short and routing them away from switching nodes. A quiet reference and adequate supply bypassing improve repeatability, while the 500 nA typical standby current helps when the controller periodically disables acquisition.
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Temperature and Analog Sensor Acquisition
The MCP3202-CI/MS can digitize two conditioned sensor outputs, including thermistor networks, resistive bridges, or buffered analog sensors. Its 12-bit SAR conversion provides a practical balance between measurement resolution, SPI simplicity, and low power, particularly in embedded monitoring equipment. Both inputs share the serial interface, so the host controller can select a channel through the conversion command and read its code over DOUT. Keep sensor excitation and the ADC reference on quiet supply paths to prevent correlated errors. The manufacturer datasheet identifies 375 µA typical active current and 50 ksps operation at 2.7 V, supporting portable instruments that periodically wake the converter. Calibration should account for the complete signal chain rather than relying on nominal converter resolution alone.
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Industrial Process Control
The MCP3202-CI/MS is appropriate for compact industrial process-control modules that monitor two analog process variables and communicate with a supervisory controller. The SPI interface supports efficient serial transfer, while the 12-bit resolution can represent process inputs with 4096 discrete code levels. The operating range of 2.7 V to 5.5 V allows integration near common embedded supply levels, and the -40 °C to +85 °C industrial temperature designation supports equipment deployed across extended ambient conditions. Separate analog and digital ground paths should converge at a controlled return point, and protection networks should be sized for the actual external wiring. Verify the reference-voltage and input-range limits in the manufacturer datasheet before selecting divider or buffer components.
推薦
Battery-Powered Portable Instruments
The MCP3202-CI/MS fits portable measurement instruments where two analog channels, low standby consumption, and a small 8-MSOP footprint are valuable. Its typical active current of 375 µA and standby current of 500 nA allow duty-cycled operation in which the controller wakes the converter, acquires a reading, and returns the system to a low-power state. Operation from 2.7 V supports lithium-battery-derived rails, although the maximum conversion rate falls to 50 ksps in that condition. Choose capacitors and references that remain stable over the required battery voltage, and avoid leaving unused analog inputs floating. The compact package reduces board area, but careful layout remains essential for reliable conversion results in a portable enclosure.
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Embedded Data Acquisition Modules
The MCP3202-CI/MS provides a compact acquisition front end for modules that measure two external voltages and forward them to a host processor. Its SPI-compatible interface allows the host to initiate conversions and retrieve data over a short serial connection, avoiding a wide parallel bus and helping control board area. The 12-bit SAR architecture is well matched to general-purpose embedded acquisition where sample rates remain below 100 ksps at 5 V. Provide a local reference with suitable bypass capacitance, maintain a controlled ground reference between the analog inputs and converter, and use series resistance where cable-connected inputs require transient protection. Validate the complete channel gain and offset during calibration because sensor conditioning and reference tolerances can dominate the apparent measurement accuracy.
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Current and Power Monitoring
The MCP3202-CI/MS can acquire two low-level voltage signals representing current, load, or power in an embedded controller. When amplifier output is scaled to remain within the converter’s permitted input range, the 12-bit SAR result provides sufficient resolution for many supervisory and protection functions. The low active current of 375 µA is useful in continuously monitored systems, while standby current of 500 nA supports low-power idle states. Keep shunt-amplifier outputs away from PWM edges and high-current switching paths to reduce correlated measurement error. A dedicated analog supply section, local reference bypass, and short input traces help preserve measurement quality. The SPI transaction overhead also makes the device more appropriate for periodic or medium-rate monitoring than for high-frequency waveform capture.
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推薦產品摘要
工程參考資料，適用於 MCP3202-CI/MS — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 8-MSOP |
| Brand | Microchip Technology |
| Resolution | 12 bit |
| Analog Input Channels | 2 channels |
| Converter Architecture | Successive approximation register ADC |
| Operating Supply Range | 2.7 V to 5.5 V |
| Maximum Conversion Rate at 5 V | 100 ksps |
| Maximum Conversion Rate at 2.7 V | 50 ksps |
| Digital Interface | SPI-compatible serial interface |
| Typical Active Current | 375 µA |
| Operating Temperature Range | -40 °C to +85 °C |
| Sample-and-Hold Circuit | On-board |
設計說明
Route D0 and D1 as short analog traces and connect them to the converter ground system through a controlled reference point. Keep switching-regulator outputs, inductor connections, and high-current return paths away from the analog inputs. Place the local VREF bypass capacitor close to pin 7, and place the VDD bypass capacitor close to pin 8. This arrangement reduces pickup from digital and power-conversion nodes while preserving the converter’s conversion accuracy.
Treat SCLK and CS as digital timing signals and keep them separated from D0, D1, and VREF where practical. The SPI host must observe the setup and hold requirements in the manufacturer datasheet, especially when operating near the maximum conversion rate. Use a defined, low-impedance ground reference for the SPI return path, and avoid routing the serial clock adjacent to an analog input unless the complete PCB stack-up and signal activity justify the coupling.
Do not assume that every 12-bit ADC is interchangeable with the MCP3202-CI/MS. Check the 8-MSOP footprint, SPI command sequence, channel arrangement, reference architecture, and full-scale input range before approving a substitute. Unused analog inputs should not be left floating. Also verify the operating mode against the -40 °C to +85 °C rating and account for conversion-rate changes between the 2.7 V and 5 V supply conditions.
Decouple VDD locally and use the recommended voltage range of 2.7 V to 5.5 V. Because the maximum conversion rate is 100 ksps at 5 V but 50 ksps at 2.7 V, timing calculations should use the actual rail voltage. For duty-cycled measurements, exploit the low 500 nA typical standby current by ensuring the host controller deactivates the converter and avoids unnecessary activity on the serial interface during idle periods.
合規資訊
The industrial-temperature ordering code supports operation from -40 °C to +85 °C, but that temperature rating is not equivalent to AEC-Q100 automotive qualification. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not identified for this exact ordering code.
