MPC8245 datasheet(26/68 Pages) FREESCALE

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MPC8245 Integrated Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Electrical and Thermal Characteristics

4.6.2

I2C AC Electrical Specifications

Table 13 provides the AC timing parameters for the I2C interfaces.

Pulse width of spikes which must be suppressed by

the input filter

tI2KHKL

050

Input current each I/O pin (input voltage is between

0.1

× OVDD and 0.9 × OVDD(max)

–10

μA3

Capacitance for each I/O pin

—10

Notes:

1. Output voltage (open drain or open collector) condition = 3 mA sink current.

2. Refer to the MPC8245 Integrated Processor Reference Manual for information on the digital filter used.

3. I/O pins obstruct the SDA and SCL lines if the OVDD is switched off.

Table 13. I2C AC Electrical Specifications

All values refer to VIH (min) and VIL (max) levels (see Table 12).

Parameter

Symbol 1

Min

Max

Unit

SCL clock frequency

fI2C

400

kHz

Low period of the SCL clock

tI2CL

1.3

—

μs

High period of the SCL clock

tI2CH

0.6

—

μs

Setup time for a repeated START condition

tI2SVKH

0.6

—

μs

Hold time (repeated) START condition (after this period, the first

clock pulse is generated)

tI2SXKL

0.6

—

μs

Data setup time

tI2DVKH

100

—

Data input hold time:

CBUS compatible masters

I2C bus devices

tI2DXKL

—

0 2

—

μs

Data output delay time:

tI2OVKL

—0.93

Set-up time for STOP condition

tI2PVKH

0.6

—

μs

Bus free time between a STOP and START condition

tI2KHDX

1.3

—

μs

Noise margin at the LOW level for each connected device (including

hysteresis)

VNL

0.1

× OVDD

—V

Table 12. I2C DC Electrical Characteristics

At recommended operating conditions with OVDD of 3.3 V ± 5%.

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