5
6568AX–SMS–23Oct08
AT90SCR100
SUMMARY PRELIMINARY
3. Pin List Configuration
• 2 package configurations to answer different needs
– 32pins: LowPinCount package: for small package size, useful for small embedded systems
(AT90SCR100L and AT90SCR100LS)
– 64pins: FullPinCount: For full performance advanced reader (AT90SCR100H)
On Full Pin Count (FPC) package, the only supported package type is QFN, and
we connect all the Vss signals to the e-pad. It is important to have it fully soldered
on groundplane of final PCB.
• USBReg refers to 3.3V USB specific regulator
• PCINTx refer to Pin Change Interrupts. See “External Interrupt Registers” in full
Datasheet.
Take care of the multiplexed functionnalities of each port. All functionnalities may
be active at the same time. The only way to disable a feature is to deactive it inside
the corresponding peripheral blokck.
Caution
!
Note
Caution
!
Table 3-1. Pin List Configuration
Portmap
ID
SCR100L
SCR100LS
SCR100H
Supply
Configuration, Role
Unmapped, generic pins
Vcc x x x
-
Vcc Voltage Supply
Vss x x e
(1)
Vss Ground
AVss x x e
(1)
AVss PLL Ground
RST x x x
Vcc
RST Reset signal: Drive low to reinitialize the chip
Xtal1 x x x XTAL1
Clock Input: Support up to 8 Mhz cristals
Xtal2 x x x XTAL2
DVcc x x x DVcc Digital Vcc:Used for internal regulator decoupling
Vcc2 x x x
-
Vcc2 Voltage Supply: To be tied to same Vcc supply voltage
Vcc3 - - x Vcc3 Voltage Supply: To be tied to same Vcc supply voltage
Vcc4 - - x Vcc4 Voltage Supply: To be tied to same Vcc supply voltage
Vcc5 - - x Vcc5 Voltage Supply: To be tied to same Vcc supply voltage
Vdcdc x x x Vdcdc Voltage Supply for DC/DC Converter.
Vss2 x x e
(1)
Vss2 Second Vss: To be tied to Vss
Vss3 x x e
(1)
Vss3 Third Vss: To be tied to Vss
D+ x x x
USB
Reg
D+
USB Interface
D- x x x D-
UCap x x x UCap USB Decoupling: Used for specific USB regulator decoupling
RTC1 - - x
Vcc
TOSC1
TOSCx: 32.768 Khz cristal input for Real Time Clock. (Please
note that these pins are not GPIO accessible).
RTC2 - - x TOSC2
