ADP1052ACPZ-R7 datasheet(62/113 Pages) AD

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ADP1052

Data Sheet

Rev. B | Page 62 of 113

Bits

Bit Name/Function

R/W

Description

SMBALERT

Checks support of the SMBALERT pin and the SMBus alert response protocol.

0 = not supported.

[3:0]

Reserved

Reserved.

VOUT_MODE

The VOUT_MODE command sets the data format for output voltage related data. The data byte for the VOUT_MODE command consists of

a 3-bit mode and 5-bit exponent parameter. The 3-bit mode determines whether the device uses linear format or direct format for the output

voltage related commands. The 5-bit parameter sets the exponent value for linear format.

Table 22. Register 0x20—VOUT_MODE

Bits

Bit Name/Function

R/W

Description

[7:5]

Mode

Output voltage data format. The value is fixed at 000, which means that only linear format is

supported.

[4:0]

Exponent

The N value for the output voltage related commands in linear format: V = Y × 2N. The value is fixed

at 10110 (twos complement, −10 decimal). The exponent for the linear format values is −10.

VOUT_COMMAND

The VOUT_COMMAND command sets the output voltage. Use the VOUT_TRANSITION_RATE command if VOUT_COMMAND is

modified while the output is active and in a steady state condition. The maximum programmable output voltage is 64 V.

Table 23. Register 0x21—VOUT_COMMAND

Bits

Bit Name/Function

R/W

Description

[15:0]

Mantissa

R/W

Sets the output voltage reference value, in volts.

16-bit, unsigned Integer Y value for linear format: V = Y × 2N. N is defined in the VOUT_MODE

command.

VOUT_TRIM

The VOUT_TRIM command applies a fixed offset voltage to the output voltage command value. It is typically set by the user to trim the

output voltage at the time that the PMBus device is assembled into the system of the user. The trim range is −32 V to +32 V, and each LSB

resolution is 2−10 = 0.9765625 mV.

Table 24. Register 0x22—VOUT_TRIM

Bits

Bit Name/Function

R/W

Description

[15:0]

Mantissa

R/W

Sets the output voltage trim value.

16-bit, twos complement, Y value for linear format: V = Y × 2N. N is defined in the VOUT_MODE

command.

VOUT_CAL_OFFSET

The VOUT_CAL_OFFSET command applies a fixed offset voltage to the output voltage command value. It is typically used by the PMBus

device manufacturer to calibrate the device in the factory. The trim range is −32 V to +32 V and each LSB size is 2−10 = 0.9765625 mV.

Table 25. Register 0x23—VOUT_CAL_OFFSET

Bits

Bit Name/Function

R/W

Description

[15:0]

Mantissa

R/W

Sets the output voltage trim value.

16-bit, twos complement, Y value for linear format: V = Y × 2N. N is defined in the VOUT_MODE

command.

VOUT_MAX

The VOUT_MAX command sets an upper limit on the output voltage that the device can attain, regardless of any other commands or

combinations. If an attempt is made to program the output voltage higher than the limit set by this command, the device responds as follows:

•

The commanded output voltage is set to the VOUT_MAX value.

•

The “none of the above” bit is set in the STATUS_BYTE command (Register 0x78[0]).

•

The VOUT bit is set in the STATUS_WORD command (Register 0x79[15]).

•

The VOUT_MAX warning bit is set in the STATUS_VOUT command (Register 0x7A[3]).

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