STPM098C datasheet(73/110 Pages) STMICROELECTRONICS

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Figure 60. Voltage setpoint definition simplified block diagram

MUX

OPERATION

DAC

VOUT_OFFSET

VOUT_TRIM

LIMITER

VOUT_MAX

VOUT_MARGIN_HIGH

VOUT_COMMAND

VOUT_MARGIN_LOW

The reference voltage (VID_Ln-VID_GND) for the n-th loop is generated by means of a dedicated resistive string

DAC and can be programmed through a dedicated PMBus™ register as follows:

VID_Ln=VID_DAC_out_lsb× VOUT_COMMAND4:0 +9

(28)

Where:

VID_DAC_out _lsb is the minimum voltage step [50 mV].

VOUT_COMMAND [4:0] are the dedicated PMBus™ configuration bits [0.5 V ~ 2 V].

The default value is VOUT_COMMAND = 0x06.

In case VOUT_COMMAND = 0x00, VID_Ln is 0 V.

Table 58. VOUT_COMMAND configuration bits

VOUT_COMMAND

VID_Ln voltage value

VOUT_COMMAND

VID_Ln voltage value

0.5

1.3

0.55

1.35

0.6

1.4

0.65

1.45

0.7

1.5

0.75 (default)

1.55

0.8

1.6

0.85

1.65

0.9

1.7

0.95

1.75

1.8

1.05

1.85

1.1

1.9

1.15

1.95

1.2

1.25

Note:

•

VOUT_COMMAND is not supposed to be changed dynamically while regulation is working. Voltage

changes are intended to be performed when the related control loop is disabled.

•

VOUT_COMMAND LSB of 50 mV corresponds to 40-41*VID_DAC_out _lsb through an internal look-up

table.

The reference voltage (VID_Ln - VID_GND) for the n-th loop can be adjusted with respect to the programmed

value through a dedicated PMBus™ register as follows:

VID_OFFSET_Ln=VID_DAC_out_lsb× VOUT_TRIM5:0 +VOUT_OFFSET5:0

STPM098C

Functional description

DS14440 - Rev 1

page 73/110

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