ATMEGA169L-8MI Atmel, ATMEGA169L-8MI Datasheet - Page 204

• Manufacturer Part Number: ATMEGA169L-8MI
• Description: IC MCU AVR 16K LV 8MHZ IND 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA169L-8MI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEMATAVRBFLY - KIT EVALUATION AVR BUTTERFLYATSTK502 - MOD EXPANSION AVR STARTER 500
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA169L-4MI; ATMEGA169L-4MI

ADC Conversion Result
204
ATmega169V/L
After the conversion is complete (ADIF is high), the conversion result can be found in
the ADC Result Registers (ADCL, ADCH).
For single ended conversion, the result is
where V
ence (see Table 89 on page 205 and Table 90 on page 206). 0x000 represents analog
ground, and 0x3FF represents the selected reference voltage minus one LSB.
If differential channels are used, the result is
where V
input pin, and V
plement form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user wants to
perform a quick polarity check of the result, it is sufficient to read the MSB of the result
(ADC9 in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result
is positive. Figure 95 shows the decoding of the differential input range.
Table 82 shows the resulting output codes if the differential input channel pair (ADCn -
ADCm) is selected with a reference voltage of V
Figure 95. Differential Measurement Range
- V
REF
IN
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
REF
the selected voltage reference. The result is presented in two’s com-
ADC
Output Code
0x3FF
ADC
0x1FF
0x000
0x200
=
0
---------------------------------------------------- -
=
V
POS
V
--------------------------
IN
V
–
REF
V
V
1024
REF
REF
NEG
.
512
NEG
REF
the voltage on the negative
the selected voltage refer-
V
REF
Differential Input
Voltage (Volts)
2514H–AVR–05/03