L6714 datasheet(28/70 Pages) STMICROELECTRONICS

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Configuring the device

L6714

28/70

Configuring the device

Multiple DACs and different current reading methodologies need to be configured before the

system starts-up by programming the apposite pin DAC/CS_SEL.

The configuration of this pin identifies two main working areas (See Table 10) distinguishing

between compliancy with Intel VR10,VR11 or AMD 6BIT specifications. According to the

main specification considered, further customs can be done: main differences are regarding

the DAC table, soft-start implementation, protection management and Dynamic VID

Transitions. Of course, the Current Reading method can be still selected through DAC /

CS_SEL pin.

See Table 11 and See Table 12 for further details about the device configuration.

8.1

DAC selection

L6714 embeds a selectable DAC (through DAC/CS_SEL, See Table 10) that allows to

regulate the output voltage with a tolerance of ±0.5% (±0.6% for AMD DAC) recovering from

offsets and manufacturing variations. In case of selecting Intel Mode, the device

automatically introduces a -19mV (both VRD10.x and VR11) offset to the regulated voltage

in order to avoid any external offset circuitry to worsen the guaranteed accuracy and, as a

consequence, the calculated system TOB.

Note:

Filter DAC/CS_SEL pin with 100pF(max) vs. SGND.

Output voltage is programmed through the VID pins: they are inputs of an internal DAC that

is realized by means of a series of resistors providing a partition of the internal voltage

reference. The VID code drives a multiplexer that selects a voltage on a precise point of the

divider. The DAC output is delivered to an amplifier obtaining the voltage reference (i.e. the

set-point of the error amplifier, VREF).

Table 10.

DAC / CS_SEL settings (See Note).

DAC / CS_SEL

Resistance vs. SGND

DAC

Current sense

method

OVP

UVP

0 (Short)

Intel

Inductor DCR

VID + 150mV

(typ) or

Programmable

-750mV (typ)

170k

Ω

MOSFET RdsON

270k

Ω

AMD

Inductor DCR

1.800V (typ) or

Programmable

-750mV (typ)

OPEN

MOSFET RdsON

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