Rainbow-electronics AT83C26 Manuel d'utilisateur télécharger pdf (Page 22)

7511B–SCR–10/05

AT83C26

The DC/DCB sensitivity to any overflow current can be modified (20%) by using the ICCADJB bit

(DC/DCB register).

Initialization Procedure for DC/DC B converter

The initialization procedure is described in flow chart:

• Select the DC/DC B level by means of bits VDCB[1:0] in DCDCB register,

• Set bits DEMBOOSTB[1:0] in INTERFACEB register following the current level control

wanted.

• Monitor VDCB_OK bit in DCDCB register in order to know when the DC/DC B Converter is

ready

Figure 10. DC/DC B Converter Initialization Procedure

Increment of DEMBOOSTB[1:0] bits increases at the same time the current overflow level in the

same proportion as the startup current. So once the DC/DC B converter is ready it advised to

decrement the DEMBOOSTB[1:0] bits to restore the overflow current to its normal or desired

value.

DEMBOOSTB[1:0]=[0:0]

VDCB_OK=1

Set Time-out to 3 ms

Time-out

Expired

DEMBOOSTB[1:0]

is at Maximum?

DC/DC B Converter

Initialization Failure

END

(ready to start LDO)

Decrement

DEMBOOSTB[1:0]

to adjust the

current overflow

Increment

DEMBOOSTB[1:0]

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 76 77

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Rainbow-electronics AT83C26 Manuel d'utilisateur Page 22