MAX16064 Datasheet, PDF (33/52 Pages) Maxim Integrated Products – ±0.3% Accurate, Quad, Power-Supply Controller with Active-Voltage Output Control and PMBus Interface

±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
Table 4. MAX16064 PMBus Command Summary (continued)
(Global commands are shaded; they are not dependent on the PAGE)
COMMAND
CODE
COMMAND NAME
MANUFACTURER-SPECIFIC COMMANDS
D0h
MFR_SMB_LOOPBACK
TRANSACTION
TYPE
R/W Word
PAGE
0-3
255
NO. OF
BYTES
m
R/W
2
—
b
R
—
—
D1h
MFR_MODE
D3h
MFR_SAMPLE_RATE
R/W Word
R/W Word
R/W
2
—
—
—
R/W
2
—
—
—
D4h
MFR_VOUT_PEAK
D6h
MFR_TEMPERATURE_PEAK
Read Word
Read Word
R/W
R/W
R/W
2
19995
0
-1
2
7612 335 -3
D8h
D9h
DAh
DBh
DDh
MFR_STATUS_WORD
MFR_FAULT_RESPONSE
MFR_FAULT_RETRY
MFR_SET_ADDRESS
MFR_RESET_DELAY
R/W Word
R/W Word
R/W Word
R/W Byte
R/W Word
R
R
2
R/W
W
2
R/W
W
2
R/W
1
R/W
2
—
—
—
—
—
—
—
—
—
—
—
—
1
0
1
DEh
MFR_MODE_OUTPUT
DFh
MFR_VLTO
E0h
MFR_DAC_ACT_CNT
E1h
MFR_RESET_OUTPUT
E2h
MFR_FAULT_REASON
E3h
MFR_FAULT_VOUT
E4h
MFR_FAULT_TEMP
R/W Word
R/W Byte
R/W Byte
R/W Byte
R/W Word
R/W Word
R/W Word
R/W
W
2
R/W
1
R/W
1
R/W
1
R/W
2
R/W
W
2
R/W
2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
The following example demonstrates how the host can
send and retrieve values from the MAX16064.
From Table 4, the coefficients used in the following
parameters are:
VOUT_COMMAND:
m = 19995, b = 0, R = -1
READ_VOUT:
m = 19995, b = 0, R = -1
If a host wants to command the power supply to output a
voltage of 3.0V, the corresponding VOUT_COMMAND
value is:
Y = (mX + b) x 10^R
Y = (19995 x 3.0 + 0) x 10^-1 = 5998.5
(decimal) = 176Eh (hex)
Conversely, if the host received a value of 176Eh on a
READ_VOUT command, this is equivalent to:
( ) X = 1 Y ×10−R − b
m
( ) X = 1 176Eh × 10−(−1) − 0 = 59980 19995 = 2.999750
19995
which is within 0.0083% of 3.0V.
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
output voltages and output voltage-related parameters
of PMBus devices are commanded and reported as
positive 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.
Fault Management and Reporting
For reporting faults/warnings to the host on a real-time
basis, the MAX16064 asserts the open-drain
SMBALERT pin and sets the appropriate bit in the
STATUS_BYTE and MFR_FAULT_STATUS registers,
respectively. On recognition of the SMBALERT asser-
tion, the host or system manager is expected to poll the
I²C bus to determine the device asserting SMBALERT.
The host sends the SMBus Alert Response Address
(0001100). The MAX16064 will ACK the SMBus Alert
Response Address, transmit its slave address, and
deassert SMBALERT. The system controller then
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