AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 227
AT90PWM81-16SN
Manufacturer Part Number
AT90PWM81-16SN
Description
IC MCU AVR 8K FLASH ISP 20SOIC
Manufacturer
Atmel
Series
AVR® 90PWM Lightingr
Datasheet
1.AT90PWM81-16MN.pdf
(325 pages)
Specifications of AT90PWM81-16SN
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, PWM, WDT
Number Of I /o
16
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 105°C
Package / Case
20-SOIC (7.5mm Width)
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
SPI
Maximum Clock Frequency
16 MHz
Number Of Timers
1
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
On-chip Dac
10 bit, 1 Channel
Height
2.35 mm
Length
13 mm
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Width
7.6 mm
For Use With
ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT90PWM81-16SN
Manufacturer:
Atmel
Quantity:
1 500
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18.2
18.3
7734P–AVR–08/10
Operation
Starting a Conversion
Figure 18-1.
The Digital to Analog Converter generates an analog signal proportional to the value of the DAC registers
value.
In order to have an accurate sampling frequency control, there is the possibility to update the DAC input
values through different trigger events.
The DAC is configured thanks to the DACON register. As soon as the DAEN bit in DACON register is
set, the DAC converts the value present on the DACH and DACL registers in accordance with the register
DACON setting.
Alternatively, a conversion can be triggered automatically by various sources. Auto Triggering is enabled
by setting the DAC Auto Trigger Enable bit, DAATE in DACON. The trigger source is selected by setting
the DAC Trigger Select bits, DATS in DACON (See description of the DATS bits for a list of the trigger
sources). When a positive edge occurs on the selected trigger signal, the DAC converts the value present
on the DACH and DACL registers in accordance with the register DACON setting. This provides a
method of starting conversions at fixed intervals. If the trigger signal is still set when the conversion com-
pletes, a new conversion will not be started. If another positive edge occurs on the trigger signal during
conversion, the edge will be ignored. Note that an interrupt flag will be set even if the specific interrupt is
Digital to Analog Converter Block Schematic
Detector
Edge
DAA TE
DAC High bits
VRef
DACH
DATS2
10
DATS1
Update D AC
T rigger
1
DAC
10
0
DATS0
10
DACON
DACL
DAC Lo w bits
-
DALA
Result
DAC
AT90PWM81
DAEN
227
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