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LTM4676A Folha de dados(PDF) 28 Page - Linear Technology |
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LTM4676A Folha de dados(HTML) 28 Page - Linear Technology |
28 / 136 page LTM4676A 28 4676afa For more information www.linear.com/LTM4676A operaTion n Soliciting (reading) module fault status and clearing (writing)modulefaultstatus(CLEAR_FAULTS,STATUS_ BYTEn, STATUS_WORDn, STATUS_VOUTn, STATUS_ IOUTn, STATUS_INPUT, STATUS_TEMPERATUREn, STATUS_CML [communications, memory, and/or logic],andSTATUS_MFR_SPECIFICn[miscellaneous]). n Storing the LTM4676A’s user-writable RAM register data to the EEPROM NVM (STORE_USER_ALL). n AnalternatemeanstotheSTORE_USER_ALLcommand to directly erase and write the LTM4676A’s EEPROM contents,protectedbyunlockkeys,tofacilitateprogram- ming of the LTM4676A EEPROM in environments such as ICT (in-circuit test) and bulk programming by, e.g., embedded hardware or by the LTpowerPlay GUI. Also, a meanstodirectlyreadtheLTM4676AEEPROMcontents (MFR_EE_UNLOCK,MFR_EE_ERASE,MFR_EE_DATA). n InstigatingasoftresetoftheLTM4676Awithoutpower- cycling SVIN power (MFR_RESET). The MFR_RESET command triggers the download of EEPROM NVM data to RAM registers, as if SVIN power had been cycled. n Forcing a download of EEPROM NVM data to RAM reg- isters(RESTORE_USER_ALL).Thisisindistinguishable from executing MFR_RESET. Other data that can be obtained from the LTM4676A via I2C communications are as follows: n Soliciting the LTM4676A for its PMBus capabilities, as defined by PMBus (CAPABILITY): • PEC (packet error checking). Note, the LTM4676A requires valid PEC in I2C communications when MFR_CONFIG_ALL[2]=1b.TheNVMfactory-default configurationisMFR_CONFIG_ALL[2]=0b,i.e.,PEC not required. • I2Ccommunicationscanbesupportedatupto400kHz SCL bus speed. Note, clock low extending (clock stretching) must be enabled on the LTM4676A to ensure robust communications above 100kHz SCL bus speeds, i.e., MFR_CONFIG_ALL[1] = 1b. The NVMfactory-defaultconfigurationisMFR_CONFIG_ ALL[1] = 0b, i.e. Clock stretching is disabled. • The LTM4676A has an SMBALERT (ALERT) pin and does support the SMBus ARA (alert response address) protocol. n Soliciting the module for the maximum output voltage it can be commanded to produce (MFR_VOUT_MAXn). n Soliciting the device for the data format of its output voltage-related registers (VOUT_MODEn). n SolicitingthedevicefortherevisionsofPMBusspecifica- tions that it supports (Part I: Rev. 1.2; Part II: Rev 1.2). n Soliciting the device for the identification of the manu- facturer of the LTM4676A, “LTC” (MFR_ID) and the manufacturer code representing the LTM4676A and revision, 0x47EX (MFR_SPECIAL_ID). n Soliciting the device for its part number, “LTM4676A” (MFR_MODEL). n Soliciting the module for its serial umber (MFR_SERIAL). n The digital status of the LTM4676A’s I/O pads and validity of the ADC (MFR_PADS) and WP pin status (MFR_COMMON[0]). ThefollowinglistindicatesotheraspectsoftheLTM4676A relating to power system management and power se- quencing that are configurable by I2C communications— provided the state of the WP (write protect) pin and the WRITE_PROTECTregistervaluepermittheI2Cwrites—and by EEPROM settings: n Providing multiple means to read/write data directly to a particular channel of the LTM4676A by assign- ing additional slave address for channels 0 and 1 (MFR_RAIL_ADDRESSn), the benefit of which is that it reducespagecommandusageandassociatedI2Ctraffic. It also facilitates altering the same register of multiple LTM4676AinunisonwithoutinvokingthePMBusgroup command protocol. See also PAGE_PLUS_READ and PAGE_PLUS_WRITE. n Configuring the output voltage to be on or off by means otherthantheRUNnpin(ON_OFF_CONFIGn[3],OPERA- TION commands). |
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