ATUC128L4U Atmel Corporation, ATUC128L4U Datasheet - Page 948

• Manufacturer Part Number: ATUC128L4U
• Manufacturer: Atmel Corporation

Specifications of ATUC128L4U

• Flash (kbytes): 128 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

38.3.13
38.3.14
32142A–12/2011
aWire
I/O Pins
2. Autonomous CAT acquisition must be longer than AST source clock period
3. CAT consumes unnecessary power when disabled or when autonomous touch not
4. CAT module does not terminate QTouch burst on detect
1. aWire MEMORY_SPEED_REQUEST command does not return correct CV
1. PA05 is not 3.3V tolerant.
2. No pull-up on pins that are not bonded
When using the AST to trigger CAT autonomous touch acquisition in sleep modes where the
CAT bus clock is turned off, the CAT will start several acquisitions if the period of the AST
source clock is larger than one CAT acquisition. One AST clock period after the AST trigger,
the CAT clock will automatically stop and the CAT acquisition can be stopped prematurely,
ruining the result.
Fix/Workaround
Always ensure that the ATCFG1.max field is set so that the duration of the autonomous
touch acquisition is greater than one clock period of the AST source clock.
used
A CAT prescaler controlled by the ATCFG0.DIV field will be active even when the CAT mod-
ule is disabled or when the autonomous touch feature is not used, thereby causing
unnecessary power consumption.
Fix/Workaround
If the CAT module is not used, disable the CLK_CAT clock in the PM module. If the CAT
module is used but the autonomous touch feature is not used, the power consumption of the
CAT module may be reduced by writing 0xFFFF to the ATCFG0.DIV field.
The CAT module does not terminate a QTouch burst when the detection voltage is
reached on the sense capacitor. This can cause the sense capacitor to be charged more
than necessary. Depending on the dielectric absorption characteristics of the capacitor, this
can lead to unstable measurements.
Fix/Workaround
Use the minimum possible value for the MAX field in the ATCFG1, TG0CFG1, and
TG1CFG1 registers.
The aWire MEMORY_SPEED_REQUEST command does not return a CV corresponding to
the formula in the aWire Debug Interface chapter.
Fix/Workaround
I s s u e a d u m m y r e a d t o a d d r e s s 0 x 1 0 0 0 0 0 0 0 0 b e f o r e i s s u i n g t h e
MEMORY_SPEED_REQUEST command and use this formula instead:
PA05 should be grounded on the PCB and left unused if VDDIO is above 1.8V.
Fix/Workaround
None.
PB13 to PB27 are not bonded on UC3L0256/128, but has no pull-up and can cause current
consumption on VDDIO/VDDIN if left undriven.
Fix/Workaround
f
sab
=
---------------- -
CV 3
7f
aw
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ATUC64/128/256L3/4U
948