MPC8544EBVTALG datasheet(60/120 Pages) FREESCALE

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MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

13.2

I2C AC Electrical Specifications

Table 52 provides the AC timing parameters for the I2C interfaces.

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

MPC8544EPowerQUICC III Integrated Communications Host Processor Reference Manual for information on

the digital filter used.

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

Table 52. I2C AC Electrical Specifications

All values refer to VIH (min) and VIL (max) levels (see Table 51).

Parameter

Symbol1

Min

Max

Unit

Notes

SCL clock frequency

fI2C

0400

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

—

μs2

Data output delay time

tI2OVKL

—0.9

Set-up time for STOP condition

tI2PVKH

0.6

—

μs—

Rise time of both SDA and SCL signals

tI2CR

20 + 0.1 Cb

300

Fall time of both SDA and SCL signals

tI2CF

20 + 0.1 Cb

300

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 51. I2C DC Electrical Characteristics (continued)

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

Parameter

Symbol

Min

Max

Unit

Notes

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