AT90PWM216 Atmel Corporation, AT90PWM216 Datasheet - Page 49

• Manufacturer Part Number: AT90PWM216
• Manufacturer: Atmel Corporation

Specifications of AT90PWM216

• Flash (kbytes): 16 Kbytes
• Pin Count: 24
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 19
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 105
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 12
• Input Capture Channels: 1
• Pwm Channels: 7
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

9.8
9.8.1
9.8.2
7710F–AVR–09/11
Internal Voltage Reference
Voltage Reference Enable Signals and Start-up Time
Voltage Reference Characteristics
• Bit 3 – WDRF: Watchdog Reset Flag
This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
• Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
• Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by writing a
logic zero to the flag.
• Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to the flag.
To make use of the Reset flags to identify a reset condition, the user should read and then reset
the MCUSR as early as possible in the program. If the register is cleared before another reset
occurs, the source of the reset can be found by examining the reset flags.
AT90PWM216/316 features an internal bandgap reference. This reference is used for Brown-
out Detection. The V
from the internal bandgap reference. In order to use the internal Vref, it is necessary to configure
it thanks to the REFS1 and REFS0 bits in the ADMUX register and to set an analog feature
which requires it.
The voltage reference has a start-up time that may influence the way it should be used. The
start-up time is given in
reference is on during the following situations:
Thus, when the BOD is not enabled, after enabling the ADC or the DAC, the user must always
allow the reference to start up before the output from the Analog Comparator or ADC or DAC is
used. To reduce power consumption in Power-down mode, the user can avoid the three condi-
tions above to ensure that the reference is turned off before entering Power-down mode.
Table 9-4.
Note:
1. When the BOD is enabled (by programming the BODLEVEL [2..0] Fuse).
2. When the ADC is enabled.
3. When the DAC is enabled.
Symbol
V
t
I
BG
BG
BG
1. Values are guidelines only.
Parameter
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current
consumption
Internal Voltage Reference Characteristics
REF
2.56V reference to the ADC, DAC or Analog Comparators is generated
Table
9-4. To save power, the reference is not always turned on. The
Condition
(1)
AT90PWM216/316
Min.
Typ.
1.1
40
15
Max.
Units
µA
µs
V
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