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MAX34440 Datasheet(PDF) 20 Page - Maxim Integrated Products |
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MAX34440 Datasheet(HTML) 20 Page - Maxim Integrated Products |
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20 / 43 page  PMBus 6-Channel Power-Supply Manager 20 Sending a DIRECT Format Value To send a value, the host must use the below equation to solve for Y: Y = (mX + b) x 10R where Y is the 2-byte, two’s complement integer to be sent to the unit; m is the slope coefficient; X is the real world value, in units such as volts, to be converted for transmission; b is the offset; and R is the exponent. The following example demonstrates how the host can send and retrieve values from the device. Table 4 shows the coefficients used in the following parameters. If a host wants to set the device to change the power- supply output voltage to 3.465V (or 3465mV), the cor- responding VOUT_MARGIN_HIGH value is: Y = (1 x 3465 + 0) x 100 = 3465 (decimal) = 0D89h (hex) Conversely, if the host received a value of 0D89h on a READ_VOUT command, this is equivalent to: X = (1/1) x (0D89h x 10-(-0) - 0) = 3465mV = 3.465V Power supplies and power converters generally have no way of knowing how their outputs are connected to ground. Within the power supply, all output voltages are most commonly treated as positive. Accordingly, all out- put voltages and output voltage-related parameters of PMBus devices are commanded and reported as posi- tive values. It is up to the system to know that a particular output is negative if that is of interest to the system. All output-voltage-related commands use 2 data bytes. Table 3. PMBus Command Code Coefficients Table 4. Coefficients for DIRECT Format Value PARAMETER COMMANDS UNITS RESOLUTION MAX m b R Voltage VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT POWER_GOOD_ON POWER_GOOD_OFF READ_VOUT MFR_VOUT_PEAK MFR_VOUT_MIN mV 1 32,767 1 0 0 Voltage Scaling VOUT_SCALE_MONITOR — 1/32,767 1 32,767 0 0 Current IOUT_OC_WARN_LIMIT IOUT_OC_FAULT_LIMIT READ_IOUT MFR_IOUT_PEAK mA 1 32,767 1 0 0 Current Scaling IOUT_CAL_GAIN mI 0.1 3276.7 1 0 1 Temperature OT_FAULT_LIMIT OT_WARN_LIMIT READ_TEMPERATURE_1 MFR_TEMPERATURE_PEAK N C 0.01 327.67 1 0 2 Timing TON_DELAY TON_MAX_FAULT_LIMIT TOFF_DELAY MFR_FAULT_RETRY ms 1 32,767 1 0 0 COMMAND CODE COMMAND NAME m b R 25h VOUT_MARGIN_HIGH 1 0 0 8Bh READ_VOUT 1 0 0 |
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