at83c26 ATMEL Corporation, at83c26 Datasheet - Page 23

• Manufacturer Part Number: at83c26
• Description: Multiple Smart Card Reader Interface With Power Management
• Manufacturer: ATMEL Corporation

LDO initialization
Procedure
7511D–SCR–02/07
When the DC/DC B voltage rises the selected voltage (VDCB_OK=1), the card voltage selection
on CVCC2, CVCC3, CVCC4 or CVCC5 starts the corresponding LDO.
The CVCC2 card voltage must be started in first (if needed). When the VCARD_OK2 is set, the
CVCC3,CVCC4, CVCC5 card voltage are started one after each other (if needed) with the same
procedure.
The LDO2, LDO3, LDO4 and LDO5 share the DC/DCB output current, for example 75mA max
when CVCCB is pregrammed to 5V. (see Table 62.)
The SC2_FULL bit must be set to use SC2 full interface:
As the power supply of CIO3/CC42 and of CRST3/CC82 is CVCC3, when SC2_FULL=1,
CVCC3 = CVCC2. The SC3 interface is disable and LDO3 receives LDO2 command
(VCARD3[1:0] = VCARD2[1:0]).
Figure 11. LDOn Initialization Procedure (n = 2, 3, 4, 5)
The LDOn output voltage must be at 0V before to program 1.8V/3V/5V.
CIO3/CC42 is CC42 and CRST3/CC82 is CC82.
IPLUSn = 1
write VCARDn[1:0]
LDOn initialization
VCARD_OKn = 1
Time-out Expired
(VDCB_OK = 1)
DCDCB started
Set Timer 2ms
and IPLUSn=1
Init condition:
Start LDOn,
failure
?
LDOn started
AT83C26
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