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LT3045 Datasheet(PDF) 46 Page - Analog Devices |
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LT3045 Datasheet(HTML) 46 Page - Analog Devices |
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46 / 62 page  Data Sheet LT3074 analog.com Rev 0. 46 of 62 5:4 Read/Write ‘b10 Output Margin High (margin value set by MFR_MARGIN register) ‘b11 Not Supported 3:2 Read/Write Margin Fault Response Value Output Status ‘b00 Not Supported unless bits [5:4] are ‘b00 or bit 7 is ‘b0 ‘b01 Ignore Faults ‘b10 Report Faults ‘b11 Not Supported unless bits [5:4] are ‘b00 or bit 7 is ‘b0 1 Read Only Not used 0 Read Only PMBus Reserved 1 Device does not respond to this data if bit 3 of the ON_OFF_CONFIG register is not set. Programming unsupported data bytes to the OPERATION register generates an invalid data fault that is reported in the STATUS_CML register, and the command is ignored. The host is notified by asserting the ALERT pin. This command has one data byte. ON_OFF_CONFIG The ON_OFF_CONFIG command configures the combination of the EN pin input and the serial bus commands needed to turn the device on and off. This includes how the unit responds when the power is applied. Table 12. ON_OFF_CONFIG Command Bit Field Descriptions Bit Access Mode Description 7:5 Read Only PMBus Reserved 4 Read Only Turn On Behavior (hardwired to turn on only when commanded by the EN pin and/or OPERATION command) 3 Read/Write OPERATION Command Control Value Output Status ‘b0 Ignore On/Off State Bit (Bit 7) of OPERATION Command ‘b1 Turn on only when On/Off Bit (Bit 7) of OPERATION Command is ’b1 2 Read Only EN pin control (EN pin must command the part to turn on) 1 Read Only EN pin polarity (hardwired to be active high) 0 Read Only Turn-off delay (hardwired to turn off immediately) CLEAR_FAULTS The CLEAR_FAULTS command is used to clear any fault bits that are set. This command clears all bits in all status registers simultaneously. At the same time, the device releases the ALERT pin signal output if the device is asserting the ALERT pin signal. If the fault is still present after the bits are cleared, the fault bit is set again and the host notified by asserting the ALERT pin low. This is a write-only command with no data bytes. WRITE_PROTECT The WRITE_PROTECT command is used to control writing to the LT3074 registers. The intention of this command is to provide protection against accidental changes. Table 13 gives a list of supported data bytes. |
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