MCP45HV31-502E/MQ

Digital Potentiometers Overview

The MCP45HV31-502E/MQ is a single-channel, 7-bit digital potentiometer from Microchip Technology. It features an I2C serial interface and volatile memory for wiper settings. The device supports high-voltage analog operation with a terminal voltage range of +36V (DGND = V-) or ±18V (DGND = V- + 18V). The specified analog operating voltage is 10V to 36V relative to V-, while the digital supply (VL) operates between 1.8V and 5.5V. It provides 128 taps with a nominal resistance of 5 kΩ (RAB), zero-scale to full-scale wiper operation, and a typical wiper resistance of 75 Ω.

Digital Potentiometers Feature Summary

• High-Voltage Analog Support: Handles up to +36V terminal voltage range or ±18V dual-rail configuration.
• I2C Serial Interface: Supports standard (100 kHz), fast (400 kHz), fast mode plus (1.7 MHz), and high-speed (3.4 MHz) modes.
• Write Latch (WLAT) Pin: Allows control over when volatile wiper register updates occur, enabling synchronization such as zero-crossing events.
• Extended Temperature Range: Operates reliably from -40°C to +125°C.

Digital Potentiometers Applications

• Industrial process control systems requiring isolated or high-side signal adjustment.
• Audio equipment gain staging with high-voltage tolerance.
• Test and measurement instrumentation calibration circuits.
• Motor control applications involving variable resistance networks in harsh environments.

Digital Potentiometers Procurement Notes

Verify that the specific ordering suffix 'MQ' corresponds to the VQFN-20 (5x5 mm) package type as defined in the datasheet. Confirm that the system design accommodates the volatile nature of the memory, ensuring wiper positions are re-initialized after power cycles via the I2C interface.

Digital Potentiometers Selection Notes

Select this model for applications requiring a 7-bit resolution (128 taps) rather than the 8-bit variant (MCP45HV51). Ensure the analog supply voltage (V+) remains within the 10V to 36V range for specified performance. Verify that the digital logic level (VL) meets the minimum requirement of VL ≥ V- + 2.7V if using the 1.8V digital supply option.

Digital Potentiometers Part Context

This component belongs to the MCP45HVX1 family, which includes variants with different resolutions (7-bit vs. 8-bit) and interfaces (I2C vs. SPI). The '31' designation indicates the 7-bit I2C version. Other family members include the MCP45HV51 (8-bit I2C) and MCP41HV31 (7-bit SPI).

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include the MCP45HV51-502E/MQ for higher resolution (8-bit) or the MCP45HV31-502E/ST for the same specifications but in a TSSOP-14 package. Cross-interface replacements like the MCP41HV31 require SPI compatibility.