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LTM4676A Fiches technique(PDF) 60 Page - Linear Technology |
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LTM4676A Fiches technique(HTML) 60 Page - Linear Technology |
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60 / 136 page  LTM4676A 60 4676afa For more information www.linear.com/LTM4676A applicaTions inForMaTion project file updated. To write the updated project file to the NVM issue a STORE_USER_ALL command. When SVIN is applied, a MFR_RESET or RESTORE_USER_ALL must be issued to allow the PWM to be enabled and valid ADCs to be read. Becauseofthecontrollerslimitedcurrentsourcingcapabil- ity,onlytheLTM4676As,theirassociatedpull-upresistors and the I2C pull-up resistors should be powered from the ORed 3.3V/3.4V supply. In addition, any device sharing the I2C bus connections with the LTM4676A must not have body diodes between the SDA/SCL pins and their respective VDD node because this will interfere with bus communicationintheabsenceofsystempower.InFigure 5, the dongle will not bias the LTM4676As when SVIN is present. It is recommended the RUNn pins be held low to avoid providing power to the load until the part is fully configured. The LTC controller/adapter I2C connections are opto-iso- lated from the PC USB. The 3.3V/3/4V from the controller/ adapter and the LTM4676A VDD33 pin must be driven to each LTM4676A with a separate PFET or diode, according to Figure 5 and Figure 6. Only when SVIN is not applied is it permissible for the VDD33 pins to be electrically in parallel because the INTVCCLDOisoff.TheDC1613’s3.3Vcurrent limit is 100mA but typical VDD33 currents are under 15mA. The VDD33 does back drive the INTVCC pin. Normally this is not an issue if SVIN is open. The DC2086 is capable of delivering 3.4V at 2A. Using a 4-pin header in Figure 5 or Figure 6 maximizes flexibility to alter the LTM4676A’s NVM contents at any stage of the user’s product development and production cycles.IftheLTM4676A’sNVMis“pre-programmed”,i.e., contains its finalized configuration, prior to being soldered to the user’s PCB/motherboard—or, if other means have been provided for altering the LTM4676A's NVM contents intheuser’ssystem—thenthe3.3V/3.4Vpinontheheader is not needed, and a 3-pin header is sufficient to establish GUI communications. The LTM4676A can be purchased withcustomizedNVMcontents;consultfactoryfordetails. Alternatively, the NVM contents of the LTM4676A can be configured in a mass production environment by design- ing for it in ICT (in-circuit test), or by providing a means of applying SVIN while holding the LTM4676A’s RUN pins low.Communicationtothemodulemustbemadepossible via the SCL and SDA pins/nets in all NVM programming scenarios. Recommended headers are found in Table 9 and Table 10. |
Numéro de pièce similaire - LTM4676A |
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Description similaire - LTM4676A |
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