MAX16064 Datasheet, PDF(17/52 Page) Maxim Integrated Products – ±0.3% Accurate, Quad, Power-Supply Controller with Active-Voltage Output Control and PMBus Interface

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MAX16064 Datasheet, PDF (17/52 Pages) Maxim Integrated Products – ±0.3% Accurate, Quad, Power-Supply Controller with Active-Voltage Output Control and PMBus Interface

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Â±0.3% Accurate, Quad, Power-Supply Controller with

Active-Voltage Output Control and PMBus Interface

Finally, the AVOC system uses a separate control loop

rate that is related to the total ADC conversion rate. The

value of register MFR_DAC_ACT_CNT sets the number

of total ADC conversion cycles (one cycle is a complete

set of ADC conversions for 4 voltages and 1 tempera-

ture) that must occur before AVOC changes the DAC

output voltage. Smaller values of MFR_DAC_ACT_CNT

shorten the adjustment time. Larger values of

MFR_DAC_ACT_CNT adjust the output voltage at much

slower rates, reducing possible negative effects on the

power-supply control loop.

External EEPROM Interface

The MAX16064 can communicate with an EEPROM

attached to the A1/SCLE and A2/SDAE. The MAX16064

communicates to the EEPROM with an address byte of

1010 0000 for writing and 1010 0001 for reading. For

the data values of 2 bytes, the most significant byte is

stored in the lower address of the EEPROM, whereas

the least significant byte is stored in the higher address

of the EEPROM.

Upon reset, the MAX16064 tests for the presence of a

configuration EEPROM. It searches for the SIGNATURE

bytes in the attached EEPROM. If the SIGNATURE

bytes are present, it concludes that it has a valid con-

figuration EEPROM and starts reading configuration

information from the attached EEPROM. If the slave

address (MFR_SET_ADDRESS) is a value other than

0x00, this overrides the slave address information pre-

viously set by the address A3:A1 pins.

Table 1b shows the contents and addresses of the con-

figuration information expected by the MAX16064. This

information is for reference only. It is recommended to

use a properly configured, working MAX16064 to save

its state to the EEPROM and limit direct modifications to

as few fields as possible (such as the slave address).

Temperature and voltage values are stored in an inter-

nal representation, which is not the same as the format

used by the corresponding PMBus commands. For

details on the EEPROM internal representation, see

Conversion Rules (Table 1a).

For example, to store to the EEPROM PAGE 2

VOUT_COMMAND = 3.0V, m = 19995, b = 0, R = -1.

First calculate the PMBUS command value, which is

5998. If the voltage range is 2V, no conversion is

required. Hence write 17h to address 28 and 6Eh to

address 29. If the voltage range is 5.5V, the stored

EEPROM value = 5998/2.75 = 2181. So write 08h to

address 28 and write 85h to address 29.

Note that the conversion is automatically handled by

the MAX16064 when it stores and loads configuration

information.

Table 1a. Conversion Rules

TEMPERATURE

READ (INTERNAL TO PMBus)

Subtract 3010 (decimal) from the PMBus value

VOLTAGE

No conversion in 2V mode;

multiply by 2.75 in 5.5V mode

WRITE (PMBus TO INTERNAL)

Add 3010 (decimal) to the PMBus value

No conversion in 2V mode;

divide by 2.75 in 5.5V mode

Table 1b. 16-Bit Words Stored in EEPROM

EEPROM

ADDRESS

NAME

MFR_FAULT_REASON

PAGE

MFR_MODE

TEMPERATURE_PEAK

MFR_FAULT_TEMP

MFR_VOUT_PEAK

PMBus COMMAND

NOTES

0E2h

0D1h

0D6h

0E4h

Must also match

MFR_TICK_RELOAD

Internal representation

(temperature)

Internal representation

(temperature)

0D4h

Internal representation

(voltage)

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