Fault thresholds are set by programming the desired trip threshold into the corresponding fault register. Table 6-1 lists the supported fault registers.

An overcurrent threshold is set by programming the Current Over-Limit Threshold register (COL). Divide the overcurrent limit value by the current LSB size to calculate the value needed to program the register.

In this example, the desired overcurrent limit threshold is 21 A. The Current LSB size is 1.2 mA/LSB, therefore the value that should be programmed into Current Over-Limit (COL) register is 21 A / 1.2 mA/LSB = 17500d or 445Ch.

An overvoltage fault threshold on the bus voltage is set by programming the bus overvoltage limit register (BOVL). In this example, the desired over voltage threshold is 16 V. Divide the target threshold voltage by the correct LSB value to calculate the value needed to program the register. For this example, the target value for the BOVL register is 16 V / 3.125 mV = 5120d (1400h).

When setting the power over-limit value, the LSB size used to calculate the value needed in the limit registers will be 256 times greater than the power LSB. This is because the power register is 24 bits in length while the power fault limit register is 16 bits.

Values stored in the alert limit registers are set to the default values after V_S power cycle events and must be reprogrammed each time power is applied.