Atmel ATA6264 - Page 81

81
4929B–AUTO–01/07
ATA6264 [Preliminary]
28. Table of Contents
Features ..................................................................................................... 1
1 Description ............................................................................................... 1
1.1 Block Description .................................................................................................3
1.1.1 Integrated Boost Converter EVZ .....................................................................3
1.1.2 Integrated Buck Converter VSAT ....................................................................3
1.1.3 Integrated Buck Converter VCORE ................................................................3
1.1.4 Linear Regulator VPERI ..................................................................................3
1.1.5 Blocks Included ...............................................................................................3
2 Pin Configuration ..................................................................................... 4
3 Absolute Maximum Ratings .................................................................... 6
4 Functional Range ..................................................................................... 8
4.1 Protection Against Substrate Currents .................................................................9
5 Supply Currents ..................................................................................... 10
5.1 Discharger Circuit ...............................................................................................11
5.2 Initial Programming of the ATA6264 ..................................................................11
5.3 Start-up and Power-down Procedure .................................................................14
5.3.1 Start-up Procedure if VVCORE is Programmed to Be 5V or 2.5V ................15
5.3.2 The Power-down Procedure Takes Place in Different Phases .....................15
5.3.3 Start-up Procedure if VVCORE Programmed to Be 1.88V ...........................16
5.3.4 The Power-down Procedure for VVCORE is Programmed to be 1.88V .......17
6 Power Supply Sequencing .................................................................... 18
7 Charge Pump .......................................................................................... 20
8 GKEY Function ....................................................................................... 22
9 EVZ Step-up Regulator .......................................................................... 24
10 VSAT Power Supply ............................................................................... 30
11 VPERI Power Supply ............................................................................. 33
12 VCORE Power Supply ........................................................................... 35
13 USP Comparator for General Purpose ................................................. 39
14 Reference Voltage and Reference Current Generation ...................... 40
15 Reset Function (Pin RESQ and Pin RESQ2) ........................................ 41
16 Watchdog Function ............................................................................... 47