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I 2 C
16 I 2 C
This section describes the DC and AC electrical characteristics for the I 2 C interface of the MPC8309.
16.1
I 2 C DC electrical characteristics
The following table provides the DC electrical characteristics for the I 2 C interface of the MPC8309.
Table 43. I 2 C DC electrical characteristics
At recommended operating conditions with OV DD of 3.3 V ± 300mV.
Parameter
Input high voltage level
Input low voltage level
Low level output voltage
Output fall time from V IH (min) to V IL (max) with a bus
Symbol
V IH
V IL
V OL
t I2KLKV
Min
0.7 × OV DD
–0.3
0
20 + 0.1 × C B
Max
OV DD + 0.3
0.3 × OV DD
0.4
250
Unit
V
V
V
ns
Notes
—
—
1
2
capacitance from 10 to 400 pF
Pulse width of spikes which must be suppressed by the
t I2KHKL
0
50
ns
3
input filter
Capacitance for each I/O pin
Input current (0 V ≤ V IN ≤ OV DD )
C I
I IN
—
—
10
±5
pF
μ A
—
4
Notes:
1. Output voltage (open drain or open collector) condition = 3 mA sink current.
2. C B = capacitance of one bus line in pF.
3. Refer to the MPC 8309 PowerQUICC II Pro Integrated Communications Processor Family Reference Manual for information
on the digital filter used.
4. I/O pins obstructs the SDA and SCL lines if OV DD is switched off.
16.2
I 2 C AC electrical specifications
The following table provides the AC timing parameters for the I 2 C interface of the MPC8309.
Table 44. I 2 C AC electrical specifications
All values refer to V IH (min) and V IL (max) levels (see Table 43 ).
Parameter
SCL clock frequency
Low period of the SCL clock
High period of the SCL clock
Setup time for a repeated START condition
Hold time (repeated) START condition (after this period, the first clock
Symbol 1
f I2C
t I2CL
t I2CH
t I2SVKH
t I2SXKL
Min
0
1.3
0.6
0.6
0.6
Max
400
—
—
—
—
Unit
kHz
μ s
μ s
μ s
μ s
pulse is generated)
Data setup time
t I2DVKH
100
—
ns
Data hold time:
I 2 C
bus devices
t I2DXKL
300
0.9 3
μ s
Rise time of both SDA and SCL signals
t I2CR
20 + 0.1
C B4
300
ns
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3
42
Freescale Semiconductor
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