ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 23

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.3.15
SAM3U-EK Evaluation Kit User Guide
G-Sensor
Figure 4-18. User Buttons
The SAM3U-EK board is equipped with a three axis accelerometer MMA7341. Basically, it is an acceler-
ation to analog voltage converter. Converted data on corresponding directions are read by 3 SAM3U4E
12-bit ADC channels.
Table 4-2. Direction
PC13 controls the device sleep mode. A low level on PC13 will place the MMA7341 into sleep mode to
reduce the current; conversely, a high PC13 level will wake it up from sleep mode.
Jumper JP15 controls the device g-select function, which allows the selection between two sensitivity
levels. Depending on the logic input placed on pin 10, the device internal gain will be changed, operating
within a 3g or 11g range with different sensitivities.
Table 4-3. g-Select
Jumper JP16 provides control of the device self-test function. When the self-test function is initiated, an
electrostatic force is applied to each axis to cause it to deflect. The x- and y-axis are deflected slightly
while the z-axis is trimmed to deflect 1g. This procedure assures that both mechanical (g-cell) and elec-
tronic sections of the accelerometer are functioning.
Note that the 0-Ohm resistors R61/R62/R63 have been implemented to offer a disconnection possibility
(freeing these dedicated PIO lines for other custom usage).
Direction
g-select
XOUT
YOUT
ZOUT
0
1
PIO usage
g-range
PC17
PC18
PB3
11g
3g
DG ND
Sensitivity
117.5mV/g
440mV/g
ADC channel
C 86
C 86
C 87
C 87
1
2
1
2
AD2
AD6
AD7
B P 4
B P 4
B P 5
B P 5
10nF
10nF
10nF
10nF
3
4
3
4
R 66
R 66
100R
100R
R 67
R 67
100R
100R
P A18
P A19
BP_L E F T#
BP_RI GHT#
Evaluation Kit Hardware
6478E–ATARM–30-Mar-11
4-15