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LTM4686BIVPBF 数据表(PDF) 93 Page - Analog Devices |
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LTM4686BIVPBF 数据表(HTML) 93 Page - Analog Devices |
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93 / 130 page  LTM4686B 93 Rev. 0 For more information www.analog.com APPENDIX C: PMBUS COMMAND DETAILS Output Current Calibration COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE IOUT_CAL_GAIN 0x38 The ratio of the voltage at the current sense pins to the sensed current. R/W Word Y L11 mΩ Factory- Only NVM Trimmed, 1.41mΩ typical MFR_IOUT_CAL_GAIN_TC 0xF6 Temperature coefficient of the current sensing element. R/W Word Y CF Y 3860 0x0F14 IOUT_CAL_GAIN The IOUT_CAL_GAIN command is nominally used to set the resistance value of the current sense element, in mil- liohms. (See also MFR_IOUT_CAL_GAIN_TC). Writes to this register result in a NACK and do not impact output current readback telemetry. This command has two data bytes and is formatted in Linear_5s_11s format. MFR_IOUT_CAL_GAIN_TC The MFR_IOUT_CAL_GAIN_TC command allows the user to program the temperature coefficient of the IOUT_CAL_ GAIN inductor DCR in ppm/°C. This command has two data bytes and is formatted in 16-bit 2’s complement integer ppm. N = –32768 to 32767 • 10–6. Nominal temperature is 27°C. The IOUT_CAL_GAIN is multiplied by: [1.0 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERATURE_1–27)]. DCR sensing will have a typical value of 3900. The IOUT_CAL_GAIN and MFR_IOUT_CAL_GAIN_TC impact all current parameters including: READ_IOUT, READ_IIN, IOUT_OC_FAULT_LIMIT and IOUT_OC_WARN_LIMIT. Writes to this register are not recommended; use the factory- default value. Input Current COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE IIN_OC_WARN_LIMIT 0x5D Input overcurrent warning limit. R/W Word N L11 A Y 30 0xDBC0 IIN_OC_WARN_LIMIT The IIN_OC_WARN_LIMIT command sets the value of the input current, in amperes, that causes a warning indicating the input current is high. The READ_IIN value will be used to determine if this limit has been exceeded. In response to the IIN_OC_WARN_LIMIT being exceeded, the device: • Sets the OTHER bit in the STATUS_BYTE • Sets the INPUT bit in the upper byte of the STATUS_WORD • Sets the IIN Overcurrent Warning bit in the STATUS_INPUT command, and • Notifies the host by asserting ALERT pin, unless masked This condition is detected by the ADC so the response time may be up to 90ms, typical. This command has two data bytes and is formatted in Linear_5s_11s format. |
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