MCP47CMB21-E/UN

Digital To Analog Converters Overview

The MCP47CMB21-E/UN is a single-channel, 12-bit buffered voltage output Digital-to-Analog Converter (DAC) featuring Multi-Time Programmable (MTP) nonvolatile memory. It operates on a single supply voltage ranging from 2.7V to 5.5V for full specifications, or 1.8V to 2.7V with reduced analog performance. The device utilizes an I2C serial interface supporting Standard (100 kbps), Fast (400 kbps), and High-Speed (up to 3.4 Mbps) modes. Key electrical parameters include a typical settling time of 16 µs, a maximum integral nonlinearity (INL) of ±1 LSB, and a gain error of ±1% of FSR. The unit includes power-on/brown-out reset protection and configurable power-down modes.

Digital To Analog Converters Feature Summary

• Integrates MTP nonvolatile memory allowing up to 32 user-programmable writes for persistent storage of DAC values and configuration registers.
• Offers flexible reference voltage selection between the internal band gap, device VDD, or an external VREF pin with selectable gain options.
• Includes WiperLock technology to latch volatile DAC register updates to the output buffer only upon explicit command.
• Provides configurable power-down states that disconnect the output buffer or select specific pull-down resistor values.

Digital To Analog Converters Applications

• Set point or offset trimming in industrial control systems
• Sensor calibration requiring precise voltage references
• Low-power portable instrumentation
• PC peripherals and data acquisition systems

Digital To Analog Converters Procurement Notes

Verify the package marking code against the datasheet to confirm the UN suffix corresponds to the correct 10-lead MSOP or DFN variant. Ensure the E suffix indicates the extended temperature range (-40°C to +125°C). Confirm the MTP memory state if previous programming cycles have reached the 32-write limit, as further writes will be inhibited.

Digital To Analog Converters Selection Notes

Select this component when a single-channel DAC with persistent nonvolatile storage is required. The 12-bit resolution provides 4096 steps, suitable for applications needing high precision. Consider the I2C address configuration via A0/A1 pins and verify compatibility with the host controller's I2C speed capabilities. Ensure the operating voltage aligns with the 2.7V-5.5V range for optimal performance specifications.

Digital To Analog Converters Part Context

This part belongs to the MCP47CXBXX family of digital-to-analog converters. The 'M' designation specifically denotes the inclusion of Multi-Time Programmable (MTP) nonvolatile memory, distinguishing it from the 'V' series which uses volatile RAM. The 'B' indicates 12-bit resolution, while 'X' represents the generic family identifier before the channel count and package suffix are applied.

Digital To Analog Converters Replacement Considerations

Direct replacements within the same family include MCP47CMB11 (10-bit) or MCP47CMB01 (8-bit) if lower resolution is acceptable. For dual-channel requirements, consider the MCP47CMB21 variants. Verify that any substitute maintains the same I2C interface protocol and package footprint.

Digital To Analog Converters FAQ

How many times can the MTP memory be programmed?

The MTP memory can be written by the user up to 32 times for each specific register location. After 32 write cycles, subsequent write commands are inhibited, and the value from the 32nd write is retained.

What is the function of the LAT/HVC pin?

The LAT/HVC pin serves two functions: applying a high-voltage level (typically 7.5V) to enable MTP programming, and acting as a latch input (WiperLock) to update the DAC output buffer with new volatile register values without affecting the nonvolatile memory.

Can the device operate with an external voltage reference?

Yes, the VREF pin can be used with an external voltage reference. When using an external reference, the user can select between a gain of 1x or 2x, provided the VREF pin voltage does not exceed VDD/2 when gain is set to 2.