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TPS544C25 Datasheet(PDF) 58 Page - Texas Instruments |
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TPS544C25 Datasheet(HTML) 58 Page - Texas Instruments |
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58 / 100 page  58 TPS544C25, TPS544B25 SLUSC81 – MAY 2015 www.ti.com Product Folder Links: TPS544C25 TPS544B25 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated 7.6.27 OT_FAULT_RESPONSE (50h) The OT_FAULT_RESPONSE command instructs the device on what action to take in response to an OT_FAULT_LIMIT. The device also: • Sets the OTFW bit in the STATUS_BYTE • Sets the OTF bit in the STATUS_TEMPERATURE • Notifies the host by asserting SMBALERT Once the over-temperature fault is tripped, the fault flag is latched until the external sensed temperature falls 20°C from the OT_FAULT_LIMIT. The contents of this register can be stored to non-volatile memory using the STORE_DEFAULT_ALL command. Bits [2:0] are hard-wired to 0x7 (111b) to indicate the 7 × TON_RISE time delay in response to an over temperature fault. The default response to an over current fault is to shut down and restart with 7 × TON_RISE time delay. COMMAND OT_FAULT_RESPONSE Format Unsigned binary Bit Position 7 6 5 4 3 2 1 0 Access r/wE r r/wE r/w r/w r r r Function RSP[1] 0 RS[2] RS[1] RS[0] X X X Default Value 1 0 1 1 1 1 1 1 7.6.27.1 RSP[1] This bit sets the over temperature fault response to either ignore or not. Default is 1. 0: The PMBus device continues operation without interruption. Note: In this “ignore” fault response mode, the associated fault status bits are set. Additionally, SMBALERT continues to be triggered if it is not masked. 1: The PMBus device shuts down and restarts according to RS[2:0]. 7.6.27.2 RS[2:0] These bits are over temperature fault retry setting. Default is 111b. 000: A zero value for the Retry Setting means that the unit does not attempt to restart. The output remains disabled until the fault is cleared (See section 10.7 of the PMBus spec.) 111: A one value for the Retry Setting means that the unit goes through a normal startup (Soft start) continuously, without limitation, until it is commanded off or bias power is removed or another fault condition causes the unit to shutdown. Any value other than 000 or 111 is not accepted. Attempting to write any other value is rejected, causing the device to assert SMBALERT along with the CML bit in STATUS_BYTE and the invalid data bit in STATUS_CML. Note, that since all 3 bits must be the same, only one (bit 5) is stored in EEPROM. NOTE The programmed response here is also applied to internally detected Over Temperture faults – with the one exception of the “ignore” response. Internal OT faults are never ignored. Internal OT faults always respond in a shutdown and attempted re-start once the part cools. 7.6.28 OT_WARN_LIMIT (51h) The OT_ WARN _LIMIT command sets the value of the temperature, in degrees Celsius, that causes an over- temperature warning condition, when the sensed temperature from the external sensor exceeds this limit. Upon triggering the over-temperature warning, the device takes the following actions: |
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