AS3709 datasheet(43/74 Pages) AMSCO

43 / 74 page

ams Datasheet, Confidential: 2013-Aug [1-02]

AS3709 – 43

Reg i st er Description

Figure 55:

SD3Voltage Register (Address 02h)

Figure 56:

SD4Voltage Register (Address 03h)

Addr: 02h

SD3Voltage

Bit

Bit Name

Default

Access

Bit Description

sd3_frequ

Selects between high and low frequency dependent

on sd3_fsel

0 : 2MHz if sd3_fsel=0, 3MHz if sd3_fsel=1

1 : 3MHz if sd3_fsel=0, 4MHz if sd3_fsel=1

6:0

sd3_vsel

'b000

0000

The voltage select bits set the SD3 output voltage

level and power the SD3 converter down.

00h : SD3 powered down

01h-40h : V_SD3=0.6V+sd3_vsel*12.5mV

41h-70h : V_SD3=1.4V+(sd3_vsel-40h)*25mV

71h-7Fh : V_SD3=2.6V+(sd3_vsel-70h)*50mV

Addr: 03h

SD4Voltage

Bit

Bit Name

Default

Access

Bit Description

sd4_frequ

Selects between high and low frequency dependent

on sd4_fsel

0 : 2MHz if sd3_fsel=0, 3MHz if sd3_fsel=1

1 : 3MHz if sd3_fsel=0, 4MHz if sd3_fsel=1

6:0

sd4_vsel

'b000

0000

The voltage select bits set the SD4 output voltage

level and power the SD4 converter down.

00h : SD4 powered down

01h-40h : V_SD4=0.6V+sd4_vsel*12.5mV

41h-70h : V_SD4=1.4V+(sd4_vsel-40h)*25mV

71h-7Fh : V_SD4=2.6V+(sd4_vsel-70h)*50mV

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