DA9211 datasheet(33/74 Pages) DIALOG

33 / 74 page

DA9211 and DA9212

Datasheet

Company confidential

Data sheet

Version <3.0>

<07-Jan-2015>

CFR0011-120-00 Rev 3

33 of 74

switching frequency can be tuned using register bit OSC_TUNE. The internal 6 MHz oscillator

frequency is tuned in steps of 180 kHz. This impacts the buck converter frequency in steps of 90 kHz

and helps to mitigate possible disturbances to other HF systems in the application.

Operation Modes and Phase Selection

13.1.2

The buck converters can operate in synchronous PWM mode and PFM mode. The operating mode is

selected using register bits BUCKA_MODE and BUCKB_MODE.

An automatic phase shedding can be enabled for each buck converter in PWM mode via

PH_SH_EN_A, PH_SH_EN_B, thereby automatically reducing or increasing the number of active

phases depending on the output load current. For DA9212 the phase shedding will automatically

change between 1-phase and 2-phase operation at a typical current of 1.3 A. For DA9211 the phase

shedding will automatically change between 1-phase and 4-phase operation at a typical current of

1.6 A. The PHASE_SEL_A and PHASE_SEL_B register fields limit the maximum number of active

phases under any conditions.

If the automatic operation mode is selected on BUCKA_MODE or BUCKB_MODE, the buck

converters will automatically change between synchronous PWM mode and PFM depending on the

load current. This improves the efficiency of the converters across the whole range of output load

currents.

Output Voltage Selection

13.1.3

The switching converter can be configured using either a 2-WIRE or a 4-WIRE interface. For security

reasons, the re-programming of registers that can cause damage when wrongly programmed (for

example, the voltage settings) can be disabled by asserting the control V_LOCK. When V_LOCK is

asserted, reprogramming the registers 0xD0 to 0x14F from control interfaces is disabled.

For each buck converter two output voltages can be pre-configured inside registers VBUCKA_A and

VBUCKB_A, and registers VBUCKA_B and VBUCKB_B. The output voltage can be selected by

either toggling register bits VBUCKA_SEL and VBUCKB_SEL or by re-programming the selected

voltage control register. Both changes will result into ramped voltage transitions, during which the

READY signal is asserted. After being enabled, the buck converter will by default use the register

settings in VBUCKA_A and VBUCKB_A unless the output voltage selection is configured via the GPI

port.

“00” has been selected in BUCKA_MODE or BUCKB_MODE, A-/B- voltage selection registers

VBUCKx_x control the operation of the PWM and PFM modes.

Regardless of the values programmed in the VBUCKx_A and VBUCKx_B registers, the registers

VBUCKA_MAX, VBUCKB_MAX will individually limit the output voltage that can be set for each of

the buck converters .

The buck converter provides an optional hardware enable/disable via selectable GPI, and configured

via control register bits BUCKA_GPI and BUCKB_GPI. A change of the output voltage from the state

of a GPI is enabled via control register bits VBUCKA_GPI and VBUCKB_GPI. After detecting a rising

or falling edge at the related GPIs, DA9211 and DA9212 will configure the buck converters according

to their status.

In addition to selecting between the A/B voltages, a track mode can be activated for Buck A to set the

output voltage. In the DA9211, the track mode is applied to the 4-phase buck converter. This feature

can be enabled on GPI0 via GPI0_PIN. The output voltage will be configured to follow the value

applied at a selected GPI pin. The voltage applied at GPI0 must be in the same range as the nominal

output voltage selectable for the buck rail (see VBUCKA_A and VBUCKA_B registers). In Track

Mode, only single ended remote sensing is possible.

DA9211 Datasheet(PDF) 33 Page - Dialog Semiconductor

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