AT90S8535-8AI Atmel, AT90S8535-8AI Datasheet - Page 71

• Manufacturer Part Number: AT90S8535-8AI
• Description: IC MCU 8K 8MHZ A/D IT 44TQFP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8535-8AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ADC Noise Canceler
Function
1041H–11/01
Figure 48. ADC Timing Diagram, Single Conversion
Figure 49. ADC Timing Diagram, Free Running Conversion
Table 26. ADC Conversion Time
The ADC features a noise canceler that enables conversion during Idle Mode to reduce
noise induced from the CPU core. To make use of this feature, the following procedure
should be used:
1. Make sure that the ADC is enabled and is not busy converting. Single Conver-
Cycle number
ADC clock
ADSC
ADIF
ADCH
ADCL
Condition
Extended Conversion
Normal Conversion
sion Mode must be selected and the ADC conversion complete interrupt must be
enabled.
ADEN = 1
ADSC = 0
ADFR = 0
ADIE = 1
1
Cycle number
ADC clock
ADSC
ADIF
ADCH
ADCL
2
MUX and REFS
update
3
from Start of Conversion)
Conversion
Sample and Hold (Cycles
complete
Sample & hold
One Conversion
4
11
5
12
14
14
6
7
13
One Conversion
8
Next Conversion
1
Sign and MSB of result
LSB of result
9
2
MUX and REFS
update
10
Conversion
25
26
complete
Time (Cycles)
Conversion
3
11
AT90S/LS8535
Sample & hold
12
4
13
Sign and MSB of result
125 - 500
130 - 520
LSB of result
Next Conversion
1
Conversion
Time (µs)
2
MUX and REFS
update
3
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