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Using the AT90USBKey
Temp.
(°C)
5
6
7
8
9
R T
(K Ω )
278,995
264,119
250,134
236,981
224,606
Temp.
(°C)
35
36
37
38
39
R T
(K Ω )
62,937
60,188
57,576
55,093
52,732
Temp.
(°C)
65
66
67
68
69
R T
(K Ω )
18,493
17,820
17,174
16,556
15,964
Temp.
(°C)
95
96
97
98
99
R T
(K Ω )
6,635
6,430
6,233
6,043
5,860
Figure 2-8 . Thermistor Schematic
PF[7..0]
VCC
R27
100k
R29
2.4.5
Data Flash memory
For mass-storage class demonstration purpose, the AT90USBKey provides two on-chip
serial Flash memories (AT45DB642D) connected to the AT90USB Serial Port Interface
(SPI).
The data-flash chip select signals are connected to PortE bit 0 and bit 1 of the AT90USB
(See Figure 2-9).
Figure 2-9 . On-board data flash schematic
PB[7..0]
VCC3
VCC3
R9
100k
VCC3
R10
100k
7
6
5
PE0
PB1
PB2
PB3
RESET
1
2
3
4
U2
8
SI SO
SCK GND
RESET VCC
CS WP
AT45DB642D CASON8
R11
100k
PE1
PB1
PB2
PB3
RESET
1
2
3
4
U3
SI
SCK
RESET
CS
SO
GND
VCC
WP
8
7
6
5
VCC3
R12
100k
AT45DB642D CASON8
2-12
7627A–AVR–04/06
AT90USBKey Hardware User Guide
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