AT32UC3L032-D3UR Atmel, AT32UC3L032-D3UR Datasheet - Page 667

• Manufacturer Part Number: AT32UC3L032-D3UR
• Description: MCU AVR32 32KB FLASH 48TLLGA
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3L032-D3UR

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.62 V ~ 3.6 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TLLGA
• Processor Series: AT32UC3x
• Core: AVR32
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 7
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR32, EWAVR32-BL
• Development Tools By Supplier: AT32UC3L-EK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 9 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

28.6.7
28.6.8
28.6.9
28.6.10
32099F–11/2010
Synchronization
Resistive Drive
Discharge Current Sources
Voltage Divider Enable (VDIVEN) Capability
9, 3, 4, 5, 6, 7, 8, 9, 3, 4, etc. MAXDEV must not exceed the value of (2(DIV+1)), or undefined
behavior will occur.
To prevent interference from the 50 or 60Hz mains line the CAT can trigger acquisition on the
SYNC signal. The SYNC signal should be derived from the mains line. The acquisition will trig-
ger on a falling edge of this signal. To enable synchronization for a specific acquisition type, the
user must write a one to the SYNC bit in the appropriate Configuration Register 1 (MGCFG1,
ATCFG1, TGACFG1, or TGBCFG1).
For QMatrix acquisition, all X lines must be sampled at a specific phase of the noise signal for
the synchronization to be effective. This can be accomplished by the synchronization timer,
which is enabled by writing a non-zero value to the SYNCTIM field in the MGCFG2 register. This
ensures that the start of the acquisition of each X line is spaced at regular intervals, defined by
the SYNCTIM field.
By default, the CAT pins are driven with normal I/O drive properties. Some of the CSA and CSB
pins can optionally drive with a 1k output resistance for improved EMC. The pins that have this
capability are listed in the Module Configuration section.
The device integrates discharge current sources, which can be used to discharge the sampling
capacitors during the QMatrix measurement phase. The discharge current sources are enabled
by writing the GLEN bit in the Discharge Current Source (DICS) register to one. This enables an
internal reference voltage, which can be either the internal 1.1V band gap voltage or VDDIO/3,
as selected by the INTVREFSEL bit in the DICS register. If the DICS.INTREFSEL bit is one, the
reference voltage is applied across an internal reference resistor, R
applied to the DIS pin, and an external reference resistor must be connected between DIS and
ground. The nominal discharge current is given by the following formula, where V
ence voltage, R
DICS.TRIM field, and k is a constant of proportionality:
I = (V
The values for the internal reference resistor, R
trical Characteristics section. The nominal discharge current may be programmed between 2
and 20µA. The reference current can be fine-tuned by adjusting the trim value in the DICS.TRIM
field.
The reference current is mirrored to each Y-pin if the corresponding bit is written to one in the
DICS.SOURCES field.
In many QMatrix applications, the sense capacitors will be charged to 50 mV or more and the
negative reference pin (ACREFN) of the analog comparators can be tied directly to ground. In
that case, the relatively small input offset voltage of the comparators will not cause acquisition
problems. However, in certain specialized QMatrix applications such as interpolated touch
screens, it may be desirable for the sense capacitors to be charged to less than 25 mV. When
such small voltages are used on the sense capacitors, the input offset voltage of the compara-
tors becomes an issue and can cause QMatrix acquisition problems.
ref
/R
ref
)*(1+(k*trim))
ref
is the value of the reference resistor, trim is the value written to the
int
, and the constant, k, may be found in the Elec-
AT32UC3L016/32/64
int
. Otherwise, the voltage is
ref
is the refer-
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