ATMEL AT45DB321D-MWU

Atmel AVR1923: XMEGA-A3BU Xplained
Hardware User Guide
Features
•
•
•
•
•
•
•
•
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Atmel® AVR® ATxmega256A3BU microcontroller
FSTN LCD display with 128x32 pixels resolution
Battery backup
Analog sensors
- Ambient light sensor
- Temperature sensor
Analog filter
Digital I/O
- Three mechanical buttons
- Two user LEDs, one power LED and one status LED
- Four expansion headers
Touch
®
- One Atmel AVR QTouch button
Memory
®
- Atmel AVR AT45DB642D DataFlash serial flash
Footprints for external memory
- Atmel AVR AT25DF series industry standard serial flash
8-bit Atmel
Microcontrollers
Application Note
1 Introduction
The Atmel AVR XMEGA-A3BU Xplained evaluation kit is a hardware platform to
evaluate the Atmel ATxmega256A3BU microcontroller.
The kit offers a large range of features that enables the Atmel AVR XMEGA® user
to get started using XMEGA peripherals right away and understand how to
integrate the XMEGA device in their own design.
Figure 1-1. XMEGA-A3BU Xplained evaluation kit.
Rev. 8394B-AVR-02/12
2 Related items
The following list contains links to the most relevant documents, software and tools
for the Atmel AVR XMEGA-A3BU Xplained:
Atmel AVR Xplained products
Xplained is a series of small-sized and easy-to-use evaluation kits for 8- and 32-bit
AVR microcontrollers. It consists of a series of low cost MCU boards for evaluation
and demonstration of feature and capabilities of different MCU families.
Atmel Xplained USB CDC driver
The Xplained USB CDC driver file supports both 32- and 64-bit versions of Windows®
XP and Windows 7. Driver installs are not necessary on Linux® operating systems.
XMEGA-A3BU Xplained schematics
Package containing schematics, BOM, assembly drawings, 3D plots, layer plots…
AVR1923: XMEGA-A3BU Xplained Hardware Users Guide
This document.
AVR1935: XMEGA-A3BU Xplained Getting Started Guide
This application note is a getting started guide for the XMEGA-A3BU Xplained.
AVR1934: XMEGA-A3BU Xplained Software User Guide
This application note is a user guide for the XMEGA-A3BU Xplained demo software.
AVR1916: XMEGA USB DFU Boot Loaders
This application note is a user guide for the XMEGA USB DFU boot loaders.
Atmel AVR Studio® 5
AVR Studio 5 is a free Atmel IDE for development of C/C++ and assembler code for
Atmel microcontrollers.
Atmel FLIP (Flexible In-system Programmer)
BatchISP (FLIP) is a command line tool for programming the flash and EEPROM
memories of the AVR and is part of the FLIP installation. It can be used to
communicate with the preprogrammed USB DFU boot loader.
Atmel JTAGICE 3
JTAGICE 3 is a mid-range development tool for Atmel 8- and 32-bit AVR
microcontrollers with on-chip debugging for source level symbolic debugging,
NanoTrace (if supported by the device) and device programming.
Atmel AVR JTAGICE mkII
AVR JTAGICE mkII is a mid-range development tool for Atmel 8- and 32-bit AVR
devices with on-chip debugging for source level symbolic debugging, NanoTrace (if
supported by the device), and device programming (superseded by JTAGICE 3).
Atmel AVR ONE!
AVR ONE! is a professional development tool for all Atmel 8- and 32-bit AVR devices
with on-chip debug capability. It is used for source level symbolic debugging, program
trace, and device programming. The AVR ONE! supports the complete development
cycle and is the fastest debugging tool offered from Atmel.
Atmel AVR Dragon™
AVR Dragon sets a new standard for low cost development tools for 8- and 32-bit
AVR devices with on-chip debug (OCD) capability.
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Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
IAR Embedded Workbench® for Atmel AVR
IAR™ Embedded Workbench is a commercial C/C++ compiler that is available for 8bit AVR. There is a 30 day evaluation version as well as a 4k (code size limited) kickstart version available from their website.
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8394B-AVR-02/12
3 General information
The Atmel AVR XMEGA-A3BU Xplained kit is intended to demonstrate the Atmel
AVR ATxmega256A3BU microcontroller. Figure 3-1 shows the available feature on
the board.
Figure 3-1. Overview of the XMEGA A3BU Xplained kit.
3.1 Preprogrammed firmware
The ATxmega256A3BU on the XMEGA-A3BU Xplained is pre-programmed with a
boot loader and a default firmware. The detailed description of the software is
available
in
the
XMEGA-A3BU
Xplained
Software
User
Guide
(http://atmel.com/dyn/resources/prod_documents/doc8413.pdf).
3.2 Power supply
The kit needs an external power supply that can deliver 5V and up to 500mA. The
actual current requirement for the board is much less than 500mA but in order to be
able to power optional expansion boards this margin is recommended.
The power can be applied to the board either via the USB connector or on pin 10 on
the header J3. The USB connector is the preferred input because it is then possible to
connect expansion boards on top of the J3 header.
The 5V (USB supply voltage) is regulated down to 3.3V with an onboard LDO
regulator, which provides power to the entire board. Expansion top boards that
require 5V will get this from the header J3 pin 10.
3.3 Measuring the Atmel AVR XMEGA power consumption
As part of an evaluation of the ATxmega256A3BU, it can be of interest to measure its
power consumption. Because the XMEGA has a separate power plane
(VCC_MCU_P3V3) on this board it is possible to measure the current consumption
4
Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
by measuring the current that is flowing into this plane. The VCC_MCU_P3V3 plane
is connected via a jumper to the main power plane (VCC_P3V3) and by replacing the
jumper with an amperemeter it is possible to determine the current consumption. To
locate the power measurement header, please refer to Figure 3-1.
WARNING
Do not power the board without having the jumper or an amperemeter
mounted since this can cause latch-up of the Atmel AVR
ATxmega256A3BU due to current flow into the I/O pins.
3.4 Programming the kit
The kit can be programmed either from an external programming tool or through an
USB boot loader which is pre-programmed on the device.
The boot loader is evoked by pushing the push button (SW0) during power-on, that is
push and hold the button and hence connect an USB cable to the kit. Programming
can be performed through the DFU programmer FLIP.
How a programmer can be connected to the kit is described in Section 4.1.
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8394B-AVR-02/12
4 Connectors
The Atmel AVR XMEGA-A3BU Xplained kit has five 10-pins, 100mil headers. One
header is used for programming the Atmel AVR ATxmega256A3BU, and the others
are used to access spare analog and digital pins on the Atmel AVR XMEGA
(expansion headers).
4.1 Programming headers
The XMEGA can be programmed and debugged by connecting an external
programming/debugging tool to the “JTAG & PDI” header shown in Figure 3-1. The
header has a standard pin-out and therefore tools like the Atmel JTAGICE 3 or Atmel
AVR ONE! can be connected to the header.
Due to physical differences of the Atmel AVR JTAGICE mkII and AVR ONE! probes,
the PCB has an opening below the JTAG and PDI header. This is to make room for
the orientation tap on the JTAGICE mkII probe.
The grey female 10-pin header on JTAGICE mkII has to be used when connecting to
the kit. The opening in the board is made to fit the orientation tab on the header.
When using PDI with the JTAGICE mkII it is necessary to use the squid cable.
A standoff adapter (no. 1) is needed when using AVR ONE!
Pin 1 on the JTAG header is at the top right corner and is marked with a square pad.
Table 4-1. XMEGA programming and debugging interface – JTAG and PDI.
Pin on programming header
JTAG (1)
PDI (2)
1
TCK
-
2
GND
GND (3)
3
TDO
DATA
4
VCC
VCC
5
TMS
-
6
nSRST
CLK
7
-
-
8
-
-
9
TDI
-
10
GND
GND
Notes:
(3)
1. Standard pin-out for JTAGICE mkII and other Atmel programming tools.
2. Requires adapter (squid cable) to connect a JTAGICE mkII.
3. It is only required to connect to one GND pin.
Because JTAG TDO and PDI DATA are connected on the PCB for this kit, JTAG
must be disabled on the device in order to use PDI. The reason for this is that when
JTAG is enabled it will enable a pull-up internally on TDO which interferes with the
PDI initialization sequence.
This will also be an issue when the application on the device uses the JTAG_TDO
pin. Nevertheless it is possible to use the pin if the TDO signal is disconnected from
the PDI DATA signal by cutting a strap (the cut-strap J203 is on the back side of the
board and marked with a text that describes its function) on the back side of the PCB.
6
Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
This however will disable the JTAG interface until the connection is reestablished by,
for example soldering a bridge on the cut-strap.
4.2 I/O expansion headers
The Atmel AVR XMEGA-A3BU Xplained headers J1, J2, J3, and J4 offer access to
the I/O of the microcontroller in order to expand the board, for example by mounting a
top module onto the board.
The header J1 offers digital communication interfaces like UART, TWI and SPI. Table
4-2 shows how the Atmel AVR XMEGA is connected to the header.
NOTE
When using TWI please note that no pull-ups are mounted on the board from the
factory, so it is required to either enable the internal pull-ups of the device or to mount
the external pull-ups on the available footprints (R200 and R201). Please refer to the
assembly drawing in the design documentation for the location of these footprints.
Table 4-2. Expansion header J1.
Pin on J1
Name on J1
XMEGA pin
Shared with onboard functionality
1
SDA
PC0
-
2
SCL
PC1
-
3
RXD
PC2
-
4
TXD
PC3
-
5
SS
PC4
-
6
MOSI
PC5
-
7
MISO
PC6
-
8
SCK
PC7
-
9
GND
-
-
10
VCC_P3V3
-
-
The header J2 is connected to analog ports of the XMEGA as shown in Table 4-3.
Table 4-3. Expansion header J2.
Pin on J2
Name on J2
XMEGA pin
Shared with onboard functionality
1
ADC0
PB0
-
2
ADC1
PB1
-
3
ADC2
PB2
-
4
ADC3
PB3
-
5
ADC4
PA4
-
6
ADC5
PA5
-
7
ADC6
PA6
-
8
ADC7
PA7
-
9
GND
-
-
10
VCC_P3V3
-
-
The I/O connected to the expansion header J3 is shared with on-board features as
sensors and JTAG interface. Therefore care must be taken when J3 is used for
expansions. Table 4-4 shows the mapping of the XMEGA I/O to J3.
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8394B-AVR-02/12
Table 4-4. Expansion header J3.
Pin on J3
Name on J3
XMEGA pin
Shared with onboard functionality
1
PA0
PA0
Light sensor (1)
2
PA1
PA1
Temperature sensor (1)
3
PA2
PA2
Filter output (1)
4
PA3
PA3
Display reset
5
PB4
PB4
JTAG TMS
6
PB5
PB5
JTAG TDI
7
PB6
PB6
JTAG TCK
8
PB7
PB7
JTAG TDO
9
GND
-
-
10
VCC_P5V0
-
-
Note:
1. Can be disconnected from onboard functionality by cut-straps.
The header J4 offers digital communication interfaces such as UART and TWI but
care must be taken because some pins are also connected to on-board peripherals.
Table 4-5. Expansion header J4.
Pin on J4
Name on J4
XMEGA pin
Shared with onboard functionality
1
SDA
PE0
-
2
SCL
PE1
-
3
RXD
PE2
-
4
TXD
PE3
-
5
SS
PD0
Display register select (1)
6
MOSI
PD3
Serial flash MOSI
7
MISO
PD2
Display and serial flash MISO input
8
SCK
PD1
Display and serial flash clock input
9
GND
-
-
10
VCC_P3V3
-
-
Note:
8
1. Can be disconnected from onboard functionality by cut-strap (J204).
Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
5 Peripherals
5.1 Serial flash
The Atmel AVR XMEGA-A3BU Xplained has an external Atmel AVR AT45DB642D
DataFlash device mounted. A footprint is also available for adding an industrial
standard serial flash like the AT25 series from Atmel. Compatible serial flash devices
for both footprints are listed in Table 5-2 and the connection to the MCU is shown in
Table 5-1.
The footprints share the same SPI lines including the chip select, and therefore it is
not possible to mount devices on both footprints at the same time.
Table 5-1. Serial flash connection.
Pin on XMEGA
Serial flash
PD1
SCK
PD3
MOSI
PD2
MISO
PF4
SS
Table 5-2. Compatible devices for the footprints.
Atmel AVR AT45DB
Atmel AVR AT25DF
AT45DB64D2-CNU (mounted)
AT25DF641A-SH
AT45DB321D-MWU
AT25DF321A-SH
AT45DB161D-SS
AT25DF161-SH
AT45DB081D-SS
AT25DF081-SSH
AT45DB041D-SS
AT25DF021-SSH
AT45DB021D-SS
AT45DB011D-SS
5.2 Atmel AVR QTouch button
The XMEGA-A3BU Xplained kit has one Atmel QTouch button and the connection to
the Atmel AVR XMEGA is shown in Table 5-3. The QTouch sensor, a copper fill, is
located on the second layer of the board (same as GND layer). The sensor is
shielded by the third layer (VCC layer) and therefore the sensor is not affected by any
touches from the back side of the board.
Table 5-3. QTouch button connection.
Pin on XMEGA
QButton
PF6
SNS
PF7
SNSK
5.3 Battery backup system
The battery backup system backs up the RTC of the XMEGA. It consists of a coin cell
battery, a battery holder and a jumper that can be used to disconnect the battery from
the XMEGA. A manganese dioxide lithium battery (CR1220) from Panasonic with a
nominal voltage of 3V and nominal capacity of 35mAh is used in this design. In order
9
8394B-AVR-02/12
to measure the backup system power consumption a header with a mounted jumper
is available. The header is shown in Figure 3-1 and is also marked with “VBAT” on
the silkscreen. The jumper can also be used to simulate battery insertion and removal
without actually removing the battery from the holder.
5.4 Mechanical buttons
Three mechanical buttons are connected to Atmel AVR XMEGA. All buttons have
external pull-ups so there is no need to activate internal pull-ups in order to use them.
When a button is pressed it will drive the I/O line to GND.
Table 5-4. Mechanical button connection.
Pin on XMEGA
Silkscreen text on PCB and designator in the schematics
PE5
SW0
PF1
SW1
PF2
SW2
5.5 LEDs
There are four LEDs available on the board that can be turned on and off. Two yellow
LEDs, one green LED (power indicator LED), and one red LED (status LED). The
green and red LEDs are inside the same package and therefore the colors can be
mixed to orange when both are activated. The yellow LEDs and the red LED can be
activated by driving the connected I/O line to GND. The green LED is controlled via a
FET and is by default on when the board is powered. However, this power indicator
LED can also be turned off by driving the gate of the FET to GND.
Table 5-5. LED connections.
Pin on XMEGA
LED
PR0
Yellow LED0
PR1
Yellow LED1
PD4
Red status LED
PD5
Green power indicator LED
5.6 FSTN LCD display
The NHD-C12832A1Z-FSW-FBW-3V3 is a FSTN LCD display and has a resolution of
128 x 32 pixels. In the design the display is connected via a SPI based interface.
Detailed information about the display can be obtained from the display datasheet
(NHD-C12832A1Z-FSW-FBW-3V3 from New Haven Displays) and from the display
controller datasheet (ST7565R from Sitronix).
The external circuitry of the display is configured to boost the 3.3V supply voltage by
a factor of 3 to ~10V. However, the typical supply voltage of the display (contrast
control) is 6V and therefore the boosted supply must be adjusted, and this must be
done by software when the display is configured. The following formula is used when
the voltage is adjusted by software:
α ⎞
⎛ Rb ⎞ ⎛
V0 = ⎜1 +
⎟ ⋅ ⎜1 −
⎟ ⋅ VREG
⎝ Ra ⎠ ⎝ 162 ⎠
10
Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
V0:
Display voltage (contrast control).
Rb ⎞
⎛
⎜1 +
⎟ : Voltage regulator internal resistance ratio.
Ra ⎠
⎝
VREG:
Internal fixed voltage supply typically 2.1V.
α:
Electronic volume level, 1 to 64 are possible values:
⎛
⎝
The recommended configuration for the display is to use ⎜1 +
Rb ⎞
⎟ = 3.5 because it
Ra ⎠
will center the adjustable voltage range at 6V which is the typical setting for this
display. Recommended values for α are listed in Table 5-6.
Table 5-6. Recommended electronic volume configuration.
Electronic volume
register value (α)
Display supply voltage V0 [V]
Contrast
20
6.44
Too strong contrast
21
6.40
22
6.35
23
6.31
24
6.26
25
6.22
26
6.17
27
6.13
28
6.08
29
6.03
30
5.99
31
5.94
32
5.90
33
5.85
34
5.81
35
5.76
36
5.72
37
5.67
38
5.63
39
5.58
40
5.54
Optimal setting
Very weak contrast
The display backlight is controlled by a FET which is by default in an off state but it is
possible to turn the backlight on with the Atmel AVR XMEGA by driving the gate of
the FET high. On the XMEGA pin PE4 is connected to the gate of the FET. The pin
PE4 is also an output of an on-chip timer module and because of that it is easy to do
dimming of the backlight by using PWM.
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8394B-AVR-02/12
5.7 Analog I/O
5.7.1 Temperature sensor
The temperature sensor circuitry consists of a serial connection of a normal and a
NTC resistor. The NTC sensor is from Murata and some part details are shown in
Table 5-7, more information can be obtained from the manufacturer’s website.
Table 5-7. NTC characteristics.
Global part number
NCP18WF104J03RB
Resistance (25℃)
100kΩ ±5%
B-Constant (25/50℃) (reference value)
4250K ±2%
B-Constant (25/80℃) (reference value)
4303K
B-Constant (25/85℃) (reference value)
4311K
B-Constant (25/100℃) (reference value)
4334K
Table 5-8 shows the temperature vs. resistance characteristic. The values are
available from Murata in the datasheet of the NTC.
Table 5-8. Resistance vs. temperature (from Murata).
Temp.
[°C]
12
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
-30
2197.225
0
357.012
30
79.222
60
22.224
-29
2055.558
1
338.006
31
75.675
61
21.374
-28
1923.932
2
320.122
32
72.306
62
20.561
-27
1801.573
3
303.287
33
69.104
63
19.782
-26
1687.773
4
287.434
34
66.061
64
19.036
-25
1581.881
5
272.500
35
63.167
65
18.323
-24
1483.100
6
258.426
36
60.415
66
17.640
-23
1391.113
7
245.160
37
57.797
67
16.986
-22
1305.413
8
232.649
38
55.306
68
16.360
-21
1225.531
9
220.847
39
52.934
69
15.760
-20
1151.037
10
209.710
40
50.677
70
15.184
-19
1081.535
11
199.196
41
48.528
71
14.631
-18
1016.661
12
189.268
42
46.482
72
14.101
-17
956.080
13
179.890
43
44.533
73
13.592
-16
899.481
14
171.028
44
42.675
74
13.104
-15
846.579
15
162.651
45
40.904
75
12.635
-14
797.111
16
154.726
46
39.213
76
12.187
-13
750.834
17
147.232
47
37.601
77
11.757
-12
707.524
18
140.142
48
36.063
78
11.344
-11
666.972
19
133.432
49
34.595
79
10.947
-10
628.988
20
127.080
50
33.195
80
10.566
-9
593.342
21
121.066
51
31.859
81
10.200
-8
559.931
22
115.368
52
30.584
82
9.848
Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
-7
528.602
23
109.970
53
29.366
83
9.510
-6
499.212
24
104.852
54
28.203
84
9.185
-5
471.632
25
100.000
55
27.091
85
8.873
-4
445.772
26
95.398
56
26.028
86
8.572
-3
421.480
27
91.032
57
25.013
87
8.283
-2
398.652
28
86.889
58
24.042
88
8.006
-1
377.193
29
82.956
59
23.113
89
7.738
Two common approximations can be used to model the temperature vs. resistance
characteristic; these are the B parameter and the Steinhart-Hart equations.
Coefficients for both formulas can be calculated from Table 5-8.
When the internal reference VCC/1.6 is used and the ADC is measuring in signed
single ended mode the codes in Table 5-9 can be read from the ADC at the various
temperatures. The calculation is based on Table 5-8.
Table 5-9. ADC codes vs. temperature (signed single ended mode with internal
VCC/1.6 reference).
ADC input [V] Temp. [°C]
ADC codes
ADC input [V]
Temp. [°C]
ADC codes
2.076
-14
2047
0.347
38
345
2.030
-13
2014
0.334
39
332
1.983
-12
1968
0.321
40
319
1.936
-11
1921
0.309
41
307
1.889
-10
1875
0.297
42
295
1.841
-9
1828
0.286
43
283
1.794
-8
1781
0.275
44
273
1.747
-7
1734
0.264
45
262
1.700
-6
1687
0.254
46
252
1.653
-5
1640
0.244
47
243
1.606
-4
1594
0.235
48
233
1.560
-3
1548
0.226
49
225
1.514
-2
1503
0.218
50
216
1.469
-1
1458
0.209
51
208
1.425
0
1414
0.202
52
200
1.380
1
1370
0.194
53
193
1.337
2
1327
0.187
54
185
1.294
3
1285
0.180
55
178
1.252
4
1243
0.173
56
172
1.211
5
1202
0.167
57
165
1.171
6
1162
0.161
58
159
1.131
7
1123
0.155
59
154
1.093
8
1084
0.149
60
148
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ADC input [V] Temp. [°C]
ADC codes
ADC input [V]
Temp. [°C]
ADC codes
1.055
9
1047
0.144
61
142
1.018
10
1010
0.138
62
137
0.982
11
975
0.133
63
132
0.947
12
940
0.128
64
127
0.913
13
907
0.124
65
123
0.880
14
874
0.119
66
118
0.848
15
842
0.115
67
114
0.817
16
811
0.111
68
110
0.787
17
781
0.107
69
106
0.758
18
752
0.103
70
102
0.730
19
724
0.100
71
99
0.702
20
697
0.096
72
95
0.676
21
671
0.093
73
92
0.650
22
645
0.090
74
89
0.626
23
621
0.086
75
86
0.602
24
597
0.083
76
83
0.579
25
575
0.081
77
80
0.557
26
553
0.078
78
77
0.535
27
531
0.075
79
75
0.515
28
511
0.073
80
72
0.495
29
491
0.070
81
70
0.476
30
472
0.068
82
67
0.458
31
454
0.065
83
65
0.440
32
437
0.063
84
63
0.423
33
420
0.061
85
61
0.407
34
404
0.059
86
59
0.391
35
388
0.057
87
57
0.376
36
373
0.055
88
55
0.361
37
359
0.053
89
53
5.7.2 Ambient light sensor
The ambient light sensor TEMT6000X01 from Vishay Semiconductors is sensitive to
visible light much like the human eye. The measurement circuitry is configured to
measure the illuminance from ~10 to ~900lx when the internal VCC/1.6 reference is
used.
The data in Table 5-10 which shows the relationship between illuminance and output
voltage of the sensor circuitry is generated based on the symbols and formulas in
Table 5-9.
14
Atmel AVR1923
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Atmel AVR1923
Table 5-10. Symbol description for illuminance calculation.
Symbols
Description
ICA
Calibrated sensor responsivity at 100lx. This is 50µA according
to the sensor datasheet
Ev
Illuminance
I
Current through the sensor
U
Output voltage of the sensor circuitry that is provided to the ADC
R
Series resistor of the sensor circuitry. 4.7kΩ has been chosen in
this design
Ev = 100 x I / ICA
Illuminance is calculated based on the relation of the actual
current through the sensor to the calibrated value at 100lx
I=U/R
Since the ADC measures the voltage across the series resistor
of the sensor circuitry it is necessary to calculate the voltage
based on the current
U = (Ev x R x ICA) / 100
Based on the current and the illuminance the output voltage of
the sensor circuitry can be calculated
Table 5-11. Illuminance vs. ADC input voltage.
Illuminance [lux]
ADC input [V]
Illuminance
1
0.0024
Dusk
10
0.0235
Dusk
20
0.0470
Dusk
30
0.0705
Dusk
40
0.0940
Dusk
50
0.1175
Living room
60
0.1410
Living room
70
0.1645
Living room
80
0.1880
Living room
90
0.2115
Living room
100
0.2350
Living room
200
0.4700
Office lighting
300
0.7050
Office lighting
400
0.9400
Office lighting
500
1.1750
Office lighting
600
1.4100
Office lighting
700
1.6450
Office lighting
800
1.8800
Office lighting
900
2.1150
Office lighting
1000
2.3500
Overcast day
15
8394B-AVR-02/12
6 Code examples
The example application is based on the Atmel AVR Software Framework that is
included in Atmel AVR Studio 5. The AVR Software Framework can also be found as
a separate package online at:
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4192.
For more information about the code example, see the application note Atmel AVR
XMEGA-A3BU Xplained Software Users Guide:
http://atmel.com/dyn/resources/prod_documents/doc8413.pdf.
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Atmel AVR1923
8394B-AVR-02/12
Atmel AVR1923
7 Revision history
To identify the revision of the Atmel AVR XMEGA-A3BU Xplained kit, locate the barcode sticker on the back side of the board. The first line on the sticker shows the
product ID and the revision. For example “A09-1248/2” can be resolved to ID=A091248 and revision=2.
7.1 Revision 2
Revision 2 of the XMEGA-A3BU Xplained kit is the initially released version. This
revision of the kit has the following product ID: A09-1248/2.
17
8394B-AVR-02/12
8 Table of contents
Features ............................................................................................... 1
1 Introduction ...................................................................................... 1
2 Related items.................................................................................... 2
3 General information......................................................................... 4
3.1 Preprogrammed firmware.................................................................................... 4
3.2 Power supply ....................................................................................................... 4
3.3 Measuring the Atmel AVR XMEGA power consumption..................................... 4
3.4 Programming the kit ............................................................................................ 5
4 Connectors ....................................................................................... 6
4.1 Programming headers......................................................................................... 6
4.2 I/O expansion headers ........................................................................................ 7
5 Peripherals ....................................................................................... 9
5.1 Serial flash........................................................................................................... 9
5.2 Atmel AVR QTouch button .................................................................................. 9
5.3 Battery backup system ........................................................................................ 9
5.4 Mechanical buttons ........................................................................................... 10
5.5 LEDs.................................................................................................................. 10
5.6 FSTN LCD display............................................................................................. 10
5.7 Analog I/O.......................................................................................................... 12
5.7.1 Temperature sensor ................................................................................................ 12
5.7.2 Ambient light sensor ................................................................................................ 14
6 Code examples............................................................................... 16
7 Revision history ............................................................................. 17
7.1 Revision 2.......................................................................................................... 17
8 Table of contents ........................................................................... 18
18
Atmel AVR1923
8394B-AVR-02/12
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8394B-AVR-02/12