Rainbow Electronics AT83C26 - Manual (Page 22)

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
END
(ready to start LDO)
Decrement
DEMBOOSTB[1:0]
to adjust the
current overflow
Increment
DEMBOOSTB[1:0]