Rainbow-electronics MAX34440 Bedienungsanleitung PDF herunterladen (Seite 20)

PMBus 6-Channel Power-Supply Manager

MAX34440

Sending a DIRECT Format Value

To send a value, the host must use the below equation

to solve for Y:

Y = (mX + b) x 10

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 10

= 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

0.1 3276.7 1 0 1

Temperature

OT_FAULT_LIMIT

OT_WARN_LIMIT

READ_TEMPERATURE_1

MFR_TEMPERATURE_PEAK

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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 42 43

MAX34440 1
43 43

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