SLUUDP1 November   2026 MC111 , MC121 , MC121-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Test Programming Mode Entry and Exit:
  6. 3OTP Programming Mode Entry and Exit
  7. 4How to Determine which OTP Page is Available to Program
  8. 5Summary

2 Test Programming Mode Entry and Exit:

The MC121-Q1, MC121, and MC111 enters test programming mode with the following procedure.

  1. Pull the FG/RD pin low and apply a high frequency signal in the range of (416-833) kHz at any duty between (20-80) % for 16 to 50 cycles to the PWM/DC pin to enter the test mode. The I2C interface is active in test mode.
  2. Optional: To confirm if I2C interface is active, read address F1h. The value should be AAh
  3. Communicate with the MC121-Q1, MC121, or MC111 over I2C to read and write to the USR_OTP configuration registers to set the desired motor performance or check the USR_TM test mode registers for the device status.
  4. To exit the test programming mode write value BBh at address F1h or power cycle the device.
  5. In test programming mode, the configured settings are lost after power cycle the device reverts to the default or previously programmed OTP configuration.