AS3658 datasheet(24/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

8.1.3 Step Up DCDC Converter Registers

Table 8. Step Up DC/DC Bit definitions

Addr: 30

Step Up DC/DC control

This register controls the different modes of the step up DCDC converter

Bit

Bit Name

Default

Access

Description

Table 9. Step Up DC/DC Bit definitions

Addr: 32

Step Up DC/DC control

This register controls the different modes of the step up DCDC converter

Bit

Bit Name

Default

Access

Description

stpup1_on

ROM

R/W

On/Off control of the step up dc/dc converter1

stpup2_on

ROM

R/W

On/Off control of the step up dc/dc converter2

stpup2_clkinv

00h

R/W

Invert input clock of step up2 converter

Use positive edge of internal clk

Use negative edge of internal clk

stpup1_freq

00h

R/W

Defines the clock frequency of the step up1 dc/dc

converter;

0fclk_int/2 (0.8 to 1.15 MHz)

1fclk_int/4 (0.4 to 0.575 MHz)

00h

n/a

Always set to 0

stpup1_res

00h

R/W

Gain selection for DCDC step_up1:

Select 0 if DCDC is used with current feedback

(DCDC_CURR1,DCDC_CURR2,DCDC_CURR3)

or if DCDC_FB is used with current feedback only

(Only R1,C1 connected; (see Figure 6))

Select 1 if DCDC_FB1 or DCDC_FB2 is used with

external resistor divider (2 resistors)

stpup2_fb_auto

00h

step_up_fb select the feedback of the DCDC

converter

The feedback is automatically chosen within the

current sinks DCDC_CURR1,DCDC_ CURR2 and

DCDC_CURR3 (never DCDC_FB). Only those are

used for this selection, which are enabled and

connected to the step up converter

(currX_ctrl must be 10)

stpup2_freq

00h

R/W

Defines the clock frequency of the step up2 dc/dc

converter

fclk_int/2 (0.8 to 1.15 MHz)

fclk_int/4 (0.4 to 0.575 MHz)

00h

n/a

Always set to 0

stpup2_res

00h

R/W

Gain selection for DCDC step_up2:

Select 0 if DCDC is used with current feedback

(DCDC_CURR1,DCDC_CURR2,DCDC_CURR3)

or if DCDC_FB is used with current feedback only

(Only R1,C1 connected; (see Figure 6))

Select 1 if DCDC_FB1 or DCDC_FB2 is used with

external resistor divider (2 resistors)

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