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| ATXMEGA128B1 Datasheet, PDF (87/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller | |||
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36.16 Two-Wire Interface Characteristics
Table 2-1 describes the requirements for devices connected to the Two Wire Serial Bus. The XMEGA Two-Wire Interface
meets or exceeds these requirements under the noted conditions. Timing symbols refer to Figure 36-7.
Figure 36-7. Two-Wire Interface Bus Timing
tof
tHIGH
tLOW
tr
SCL
tSU;STA
SDA
tHD;STA
tHD;DAT
tSU;DAT
tSU;STO
tBUF
Table 36-30. Two wire serial bus characteristics.
Symbol
VIH
VIL
Vhys
VOL
tr
tof
tSP
II
CI
fSCL
RP
tHD;STA
tLOW
tHIGH
tSU;STA
Parameter
Condition
Input High Voltage
Input Low Voltage
Hysteresis of Schmitt Trigger Inputs
Output Low Voltage
3mA, sink current
Rise Time for both SDA and SCL
Output Fall Time from VIHmin to VILmax
Spikes Suppressed by Input Filter
10pF < Cb < 400pF(2)
Input Current for each I/O Pin
Capacitance for each I/O Pin
0.1VCC < VI < 0.9VCC
SCL Clock Frequency
Value of Pull-up resistor
Hold Time (repeated) START condition
Low Period of SCL Clock
High Period of SCL Clock
Set-up time for a repeated START condition
fPER(3)>max(10fSCL, 250kHz)
fSCL ï£ 100kHz
fSCL > 100kHz
fSCL ï£ 100kHz
fSCL > 100kHz
fSCL ï£ 100kHz
fSCL > 100kHz
fSCL ï£ 100kHz
fSCL > 100kHz
fSCL ï£ 100kHz
fSCL > 100kHz
Min
0.7*VCC
-0.5
0.05VCC(1)
0
20+0.1Cb(1)(2)
20+0.1Cb(1)(2)
0
-10
0
V----C----C----â-----0---.-4----V--
3mA
4.0
0.6
4.7
1.3
4.0
0.6
4.7
0.6
Typ
Max Units
VCC+0.5
0.3*VCC
V
0
0.4
300
250
ns
50
10
µA
10
pF
400
kHz
1----0--0----n---s-
Cb
3----0--0----n---s-
Cb
ï
µs
XMEGA B1 [DATASHEET] 87
8330CâAVRâ07/2012
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