Datasheet

LM5066

SNVS655G –JUNE 2011–REVISED FEBRUARY 2013

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Table 5. OT_FAULT_LIMIT Register

Value Meaning Default

0h – 0FFEh Overtemperature Fault threshold value 0960h (150°C)

0FFFh Overtemperature Fault detection disabled n/a

OT_WARN_LIMIT (51h)

The OT_WARN_LIMIT command is a standard PMBus command that allows configuring or reading the threshold

for the overtemperature warning detection. Reading and writing to this register should use the coefficients shown

in Table 41. Accesses to this command should use the PMBus read or write word protocol. If the measured

temperature exceeds this value, an Overtemperature warning is triggered and the OT WARN flags set in the

respective registers and the SMBA signal asserted. A single temperature measurement is an average of 16

round-robin cycles; therefore, the minimum temperature warn detection time is 16 ms.

Table 6. OT_WARN_LIMIT Register

Value Meaning Default

0h – 0FFEh Overtemperature Warn Threshold Value 07D0h (125°C)

0FFFh Overtemperature Warn detection disabled n/a

VIN_OV_WARN_LIMIT (57h)

The VIN_OV_WARN_LIMIT command is a standard PMBus command that allows configuring or reading the

threshold for the VIN over-voltage warning detection. Reading and writing to this register should use the

coefficients shown in Table 41. Accesses to this command should use the PMBus read or write word protocol. If

the measured value of VIN rises above the value in this register, VIN OV Warn flags are set in the respective

registers and the SMBA signal is asserted.

Table 7. VIN_OV_WARN_LIMIT Register

Value Meaning Default

0h – 0FFEh VIN Over-voltage Warning detection 0FFFh (disabled)

threshold

0FFFh VIN Over-voltage Warning disabled n/a

VIN_UV_WARN_LIMIT (58h)

The VIN_UV_WARN_LIMIT command is a standard PMBus command that allows configuring or reading the

threshold for the VIN under-voltage warning detection. Reading and writing to this register should use the

coefficients shown in Table 41. Accesses to this command should use the PMBus read or write word protocol. If

the measured value of VIN falls below the value in this register, VIN UV Warn flags are set in the respective

Table 8. VIN_UV_WARN_LIMIT Register

Value Meaning Default

1h – 0FFFh VIN Under-voltage Warning detection 0000h (disabled)

threshold

0000h VIN Under-voltage Warning disabled n/a

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