AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 212

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

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

17.6.4
212
AT90PWM81
ADC Accuracy Definitions
differential inputs using the AMPxIS bit with both inputs unconnected.
Status register – AMP0CSR” on page
the measurement results. Using this kind of software based offset correction, offset on any channel can be
reduced below one LSB.
An n-bit single-ended ADC converts a voltage linearly between GND and V
lowest code is read as 0, and the highest code is read as 2
Several parameters describe the deviation from the ideal behavior:
Figure 17-10. Offset Error
• Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal transition (at 0.5
• Gain Error: After adjusting for offset, the Gain Error is found as the deviation of the last transition
LSB). Ideal value: 0 LSB.
(0x3FE to 0x3FF) compared to the ideal transition (at 1.5 LSB below maximum). Ideal value: 0 LSB
Output Code
Offset
Error
224.). This offset residue can be then subtracted in software from
n
-1.
V
REF
(See “Amplifier 0 Control and
REF
Input Voltage
in 2
n
Ideal ADC
Actual ADC
steps (LSBs). The
7734P–AVR–08/10