UCD90124ARGCT

The Texas Instruments UCD90124ARGCT is a 12-rail sequencer and system health monitor designed for complex power management in digital systems. It monitors and sequences up to 12 voltage rails, with all rails sampled every 400 µs. The integrated 12-bit ADC with a 2.5-V internal reference (0.5% accuracy) enables precise voltage and current monitoring across the rails. The device supports closed-loop margining for 10 rails, allowing adjustment of rail voltages to user-defined thresholds. Four programmable undervoltage and overvoltage thresholds per monitor provide flexible fault detection. Nonvolatile error and peak-value logging stores up to 12 fault detail entries. The UCD90124ARGCT includes a programmable watchdog timer and system reset, flexible digital I/O, and a multiphase PWM clock generator with frequencies from 15.259 kHz to 125 MHz. It offers JTAG and I2C/SMBus/PMBus interfaces for configuration and communication. The device also manages up to four fans with five user-defined speed-vs-temperature setpoints, supporting two-, three-, and four-wire fans. The part is housed in a 64-pin VQFN (RGC) package measuring 9 mm × 9 mm, with surface mount mounting. It operates over a temperature range of -40°C to 125°C.