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Evaluation Kit Hardware
The SAM3S chip internally generates the following clocks:
SLCK, the Slow Clock, which is the only permanent clock of the system
MAINCK, the output of the Main Clock Oscillator selection: either a Crystal Oscillator or a 4/8/12 MHz
Fast RC Oscillator
PLLACK, the output of the Divider and 60 to 130 MHz programmable PLL (PLLA)
PLLBCK, the output of the Divider and 60 to 130 MHz programmable PLL (PLLB)
4.3.4
Reset Circuitry
On-board NRST button BP1 provides an external reset control of the SAM3S.
The NRST pin is bidirectional. It is handled by the on-chip reset controller. It can be driven low to provide
a reset signal out to the external components. Conversely, it can be asserted low from the outside to
reset the microcontroller Core and the peripherals. The NRST pin integrates a permanent pull-up resistor
of about 100 kOhm to VDDIO.
On the SAM3S-EK board, the NRST signal is connected to the LCD module and JTAG port.
Note:
At power-on, the NRST signal is asserted with a default duration of 2 clock cycles. That duration may not be
sufficient to correctly reset any other system or board devices connected to that signal. First, in your custom
application, you need to check for these devices' datasheets about reset duration requirements. Then, you
need to set an appropriate configuration in the NRST Manager. This is done through the ERSTL field in the
RSTC_MR register. The NRST duration is thereby configurable between 60 μs and 2 s, whether it is subse-
quently activated by a software reset or a user reset. Refer to the SAM3S datasheet for in depth
information.
4.3.5
Power Supply and Management
The SAM3S-EK board is supplied with an external 5V DC block through input J9. It is protected by a
PolyZen diode MN9 and an LC combinatory filter MN10. The PolyZen is used in the event of an incorrect
power supply connection.
The adjustable LDO regulator MN12 is used for the 3.3V rail main supply. It powers all the 3.3V compo-
nents on the board.
Figure 4-4.
Power Block
J9
MN9
MN10
MP179P 2.1mm
ZEN056V1 3 0A24L S
BNX002-01
+5V
1
2
1
3
1
S V
CV
3
C64
100nF
+ C65
22 u F
2
S G CG1
CG2
CG 3
4
5
6
+ C66
22 u F
DGND
MN12
MIC29152W U
Micrel' s 1.5A LDO, TO26 3 -5
+5V
+ 3 V 3
2
VIN
VOUT
4
1
S D
ADJ
5
R 8 9
169K 1%
+ C75
100 u F
C76
100nF
R92
102K 1%
The SAM3S4/2/1 product series has different types of power supply pins:
VDDIN pin:
Power for the internal voltage regulator, ADC, DAC, and analog comparator power supplies.
The voltage ranges from 1.8V to 3.6V.
4-4
11031C–ATARM–30-Mar-11
SAM3S-EK Development Board User Guide
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