Datasheet

Symbol Parameter Condition Min. Max Units
t
BUF
Bus free time between a STOP
and START condition
f
SCL
≤ 100kHz 4.7 – μs
f
SCL
> 100kHz 1.3 – μs
Note:
1. This parameter is characterized and not 100% tested.
2. Required only for f
SCL
> 100kHz.
3. C
b
= capacitance of one bus line in pF.
4. f
CK
= CPU clock frequency.
5. This requirement applies to all 2-wire Serial Interface operation. Other devices connected to the 2-
wire Serial Bus need only obey the general f
SCL
requirement.
Figure 29-5. Two-wire Serial Bus Timing
t
SU;STA
t
LOW
t
HIGH
t
LOW
t
of
t
HD;STA
t
HD;DAT
t
SU;DAT
t
SU;STO
t
BUF
SCL
SDA
t
r
29.9. ADC characteristics
Table 29-11. ADC Characteristics, Single Ended Channel
Symbol Parameter Condition Min.
(1)
Typ Max Units
Resolution - 10 - Bits
Absolute accuracy (Including
INL, DNL, quantization error,
gain and offset error)
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
- 1.9 - LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1MHz
- 3.25 - LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
Noise Reduction Mode
- 1.9 - LSB
V
REF
= 4V, V
CC
= 4V,
ADC clock = 1MHz
Noise Reduction Mode
- 3.25 - LSB
Integral Non-Linearity (INL) V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
- 1.1 - LSB
Differential Non-Linearity (DNL) V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
- 0.3 - LSB
Gain Error V
REF
= 4V, V
CC
= 4V,
ADC clock = 200kHz
- 1.6 - LSB
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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