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AT25DF641A-SH Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT25DF641A-SH Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 13 page 8 AVR32918 32159A-AVR-01/11 6 Miscellaneous I/O 6.1 Mechanical button The board is equipped with one mechanical button. Because the button is used to enter bootloader mode it has a pull-up mounted, this means it is not necessary to use the pull-up in the UC3 to detect the status of the button. 6.2 LEDs The Atmel UC3-A3 XPLAINED has four yellow LEDs which are connected to the Atmel AT32UC3A3256 and all of them are active low. One dual LED is mounted near the USB connector. It has one green LED which is used to indicate power and one red LED that can be used for other purposes. The green LED will be active when power is applied to the board but it can be disabled by software from the AT32UC3A3256 device if needed. The red LED is active low and the green LED is active high. 6.3 Analog I/O A RC filter and a NTC temperature sensor are connected to ADC0 and ADC1 respectively. These analog sensors are used as input to the ADC but it is also possible to disconnect them by cutting the cut-straps on the bottom side of the board. The RC filter (1. order low-pass) has an approximate 3dB cut-off frequency of 159Hz. The input to the RC filter is one of the UC3 GPIO pins that can be configured to output a PWM signal to the RC filter. This can be used to generate a DC voltage on the output of the RC filter which can be measured on the ADC. As this is a 1. order filter, the ripple on the DC voltage is proportional to the input frequency. A higher input frequency will give lower ripple on the output. 6.4 Touch The UC3-A3 XPLAINED kit has one QTouch button and one QTouch slider; both are connected to GPIO pins on the AT32UC3A3256. Table 6-1. UC3 touch connections. Touch sensor onboard reference QTouch method pin name UC3 GPIO pin CH1 SNSK1 98 CH1 SNS1 99 CH2 SNSK2 100 CH2 SNS2 101 CH3 SNSK3 102 CH3 SNS3 103 CH4 SNSK4 104 CH4 SNS4 105 |
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