xmega a3u - Elfa
xmega a3u - Elfa
xmega a3u - Elfa
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XMEGA A3U<br />
36.16 Two-Wire Interface Characteristics<br />
Table 36-32 describes the requirements for devices connected to the Two-Wire Interface Bus.<br />
The Atmel AVR XMEGA Two-Wire Interface meets or exceeds these requirements under the<br />
noted conditions. Timing symbols refer to Figure 36-7.<br />
Figure 36-7.<br />
Two-wire interface bus timing.<br />
t of<br />
t HIGH<br />
t LOW<br />
t r<br />
SCL<br />
t SU;STA<br />
t HD;STA<br />
t HD;DAT<br />
t SU;DAT<br />
t SU;STO<br />
SDA<br />
t BUF<br />
Table 36-32.<br />
Two-wire interface characteristics.<br />
Symbol Parameter Condition Min. Typ. Max. Units<br />
V IH Input High Voltage 0.7V CC V CC +0.5<br />
V IL Input Low Voltage 0.5 0.3×V CC<br />
V hys Hysteresis of Schmitt Trigger Inputs 0.05V CC<br />
(1)<br />
V OL Output Low Voltage 3mA, sink current 0 0.4<br />
t r Rise Time for both SDA and SCL 20+0.1C b<br />
(1)(2)<br />
300<br />
t of Output Fall Time from V IHmin to V ILmax 10pF < C b < 400pF (2) 20+0.1C b<br />
(1)(2)<br />
250<br />
t SP Spikes Suppressed by Input Filter 0 50<br />
I I Input Current for each I/O Pin 0.1V CC < V I < 0.9V CC -10 10 µA<br />
C I Capacitance for each I/O Pin 10 pF<br />
f SCL SCL Clock Frequency f PER<br />
(3)<br />
>max(10f SCL , 250kHz) 0 400 kHz<br />
R P<br />
Value of Pull-up resistor<br />
f SCL ≤ 100kHz<br />
f SCL > 100kHz<br />
V CC<br />
– 0.4V<br />
----------------------------<br />
3mA<br />
100ns<br />
---------------<br />
C b<br />
300ns<br />
---------------<br />
C b<br />
V<br />
ns<br />
Ω<br />
8386B–AVR–12/11<br />
90