MPC8347E datasheet(49/108 Pages) FREESCALE

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MPC8347EAMPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

I2C

12 I2C

This section describes the DC and AC electrical characteristics for the I2C interface of the MPC8347EA.

12.1

I2C DC Electrical Characteristics

Table 41 provides the DC electrical characteristics for the I2C interface of the MPC8347EA.

12.2

I2C AC Electrical Specifications

Table 42 provides the AC timing parameters for the I2C interface of the MPC8347EA. Note that all values

refer to VIH (min) and VIL (max) levels (see Table 41).

Table 41. I2C DC Electrical Characteristics

At recommended operating conditions with OVDD of 3.3 V ± 10%.

Parameter

Symbol

Min

Max

Unit Notes

Input high voltage level

VIH

0.7

× OV

OVDD+ 0.3

Input low voltage level

VIL

–0.3

0.3

× OV

Low level output voltage

VOL

00.2

× OV

Output fall time from VIH(min) to VIL(max) with a bus capacitance

from 10 to 400 pF

tI2KLKV 20 + 0.1 × CB

250

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

× OV

and 0.9

× OV

DD(max)

–10

μA4

Capacitance for each I/O pin

—10

Notes:

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

2. CB = capacitance of one bus line in pF.

3. Refer to the MPC8349E Integrated Host Processor Reference Manual for information on the digital filter used.

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

Table 42. I2C AC Electrical Specifications

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 hold time:

CBUS compatible masters

I2C bus devices

tI2DXKL

—

0 2

—

0.9 3

μs

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