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LTC2974 数据表(PDF) 57 Page - Linear Technology |
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LTC2974 数据表(HTML) 57 Page - Linear Technology |
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57 / 136 page  LTM4676A 57 4676afa For more information www.linear.com/LTM4676A applicaTions inForMaTion communications are valid in this supply configura- tion. If SVIN has not been applied to the LTM4676A, MFR_COMMON[3] will be asserted low, indicating that NVM has not initialized. If this condition is detected, the part will only respond to addresses 0x5A and 0x5B. To initialize the part issue the following set of commands: global address 0x5B command 0xBD data 0x2B followed by global address 0x5B command 0xBD and data 0xC4. Thepartwillnowrespondtothecorrectaddress.Configure the part as desired then issue a STORE_USER_ALL. When SVIN is applied a MFR_RESET or RESTORE_USER_ALL, command must be issued to allow the PWM to be enabled and valid ADC conversions to be read. FAULT DETECTION AND HANDLING The LTM4676A GPIOn pins are configurable to indicate a varietyoffaultsincludingOV/UV,OC,OT,timingfaults,peak overcurrentfaults.InadditiontheGPIOnpinscanbepulled low by external sources to indicate to the LTM4676A the presence of a fault in some other portion of the system. The fault response is configurable via PMBus Command Code names with a _RESPONSE suffix and allows the following options: n Ignore n Shut Down Immediately—Latch Off n ShutDownImmediately—RetryIndefinitelyattheTime Interval Specified in MFR_RETRY_DELAYn Refer to Appendix C and the PMBus specification for more details. The OV response is automatic and rapid. If an OV is de- tected, MTn is turned off and BGn is turned on, until the OV condition clears. Fault logging is available on the LTM4676A. The fault logging is configurable to automatically store data when a fault occurs that causes the unit to fault off. The header portion of the fault logging table contains peak values. It is possible to read these values at any time. This data will be useful while troubleshooting the fault. If the LTM4676A internal temperature is in excess of 85°C or below 0°C, the write into the NVM is not recommended. The data will still be held in RAM, unless the 3.3V supply UVLO threshold is reached. If the die temperature exceeds 130°C all NVM communication is disabled until the die temperature drops below 125°C, with the exception of the RESTORE_USER_ALL command, which is valid at any temperature. OPEN-DRAIN PINS Note that up to nine pull-up resistors are required for proper operation of the LTM4676A: • Three for the SMBus/I2C interface (the SCL, SDA, and ALERT pins); two, only if the system SMBus host does not make use of the ALERT interrupt. (These are 5V tolerant). • One each for the RUN0 and RUN1 pins (or, just one to RUN0 and RUN1, if RUN0 and RUN1 are electrically connected together). (These are 5V tolerant). • OneeachforGPIO0andGPIO1(or,justonetoGPIO0and GPIO1, if GPIO0 and GPIO1 are electrically connected together). (These are 3.3V tolerant). • One on SHARE_CLK, required, for the LTM4676A to establish a heartbeat time base for timing-related op- erations and functions (output voltage ramp-up timing, voltage margining transition timing, SYNC open-drain drive frequency). (SHARE CLK is 3.3V tolerant). • One on SYNC, in order for the LTM4676A to phase lock to the frequency generated by the open-drain output of its digital engine. EXCEPTION: in some applications, it is desirable to drive the LTM4676A’s SYNC pin with a hard-driven (low impedance) external clock. This is the only scenario where the LTM4676A does not require a pull-up resistor on SYNC. However, be aware that the SYNC pin can be low impedance during NVM initialization,i.e.,duringdownloadofEEPROMcontents to RAM (for ~50ms [Note 12] after SVIN power is ap- plied). Therefore, the hard-driven clock signal should only be applied to the LTM4676A SYNC pin through a |
类似零件编号 - LTC2974 |
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类似说明 - LTC2974 |
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