AT90USBKey Hardware User Guide
AT90USBKey Hardware User Guide
AT90USBKey Hardware User Guide
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Using the <strong>AT90USBKey</strong><br />
2.4.5 Data Flash memory<br />
PB[7..0]<br />
2-12 <strong>AT90USBKey</strong> <strong>Hardware</strong> <strong>User</strong> <strong>Guide</strong><br />
7627A–AVR–04/06<br />
VCC3<br />
PE0<br />
PB1<br />
PB2<br />
PB3<br />
RESET<br />
R9<br />
100k<br />
Temp.<br />
(°C)<br />
RT<br />
(KΩ)<br />
Temp.<br />
(°C)<br />
5 278,995 35 62,937 65 18,493 95 6,635<br />
6 264,119 36 60,188 66 17,820 96 6,430<br />
7 250,134 37 57,576 67 17,174 97 6,233<br />
8 236,981 38 55,093 68 16,556 98 6,043<br />
9 224,606 39 52,732 69 15,964 99 5,860<br />
Figure 2-8 . Thermistor Schematic<br />
PF[7..0]<br />
RT<br />
(KΩ)<br />
For mass-storage class demonstration purpose, the <strong>AT90USBKey</strong> provides two on-chip<br />
serial Flash memories (AT45DB642D) connected to the AT90USB Serial Port Interface<br />
(SPI).<br />
The data-flash chip select signals are connected to PortE bit 0 and bit 1 of the AT90USB<br />
(See Figure 2-9).<br />
1<br />
2<br />
3<br />
4<br />
Figure 2-9 . On-board data flash schematic<br />
U2<br />
SI<br />
SCK<br />
RESET<br />
CS<br />
WP 5<br />
VCC 6<br />
GND 7<br />
SO 8<br />
AT45DB642D CASON8<br />
VCC3<br />
R11<br />
100k<br />
VCC3<br />
PE1<br />
PB1<br />
PB2<br />
PB3<br />
RESET<br />
R10<br />
100k<br />
VCC<br />
Temp.<br />
(°C)<br />
R27<br />
100k<br />
PF0<br />
R29<br />
1<br />
2<br />
3<br />
4<br />
RT<br />
(KΩ)<br />
U3<br />
SI<br />
SCK<br />
RESET<br />
CS<br />
WP 5<br />
VCC 6<br />
GND 7<br />
SO 8<br />
AT45DB642D CASON8<br />
Temp.<br />
(°C)<br />
VCC3<br />
RT<br />
(KΩ)<br />
R12<br />
100k
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