IMX35 datasheet(65/148 Pages) FREESCALE

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i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

4.9.11

I2C AC Electrical Specifications

This section describes the electrical characteristics of the I2C module.

4.9.11.1

I2C Module Timing

Figure 44 depicts the timing of the I2C module. Table 48 lists the I2C module timing parameters.

Figure 44. I2C Bus Timing Diagram

Table 48. I2C Module Timing Parameters

Parameter

Standard Mode

Fast Mode

Unit

Min.

Max.

Min.

Max.

IC1

I2CLK cycle time

—

2.5

—

μs

IC2

Hold time (repeated) START condition

4.0

—

0.6

—

μs

IC3

Set-up time for STOP condition

4.0

—

0.6

—

μs

IC4

Data hold time

1 A device must internally provide a hold time of at least 300 ns for the I2DAT signal in order to bridge the undefined region of

the falling edge of I2CLK.

3.452

2 The maximum hold time has to be met only if the device does not stretch the LOW period (ID IC6) of the I2CLK signal.

0.92

μs

IC5

HIGH Period of I2CLK Clock

4.0

—

0.6

—

μs

IC6

LOW Period of the I2CLK Clock

4.7

—

1.3

—

μs

IC7

Set-up time for a repeated START condition

4.7

—

0.6

—

μs

IC8

Data set-up time

250

—

1003

3 A fast-mode I2C-bus device can be used in a standard-mode I2C-bus system, but the requirement of set-up time (ID IC7) of

250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the I2CLK signal.

If such a device does stretch the LOW period of the I2CLK signal, it must output the next data bit to the I2DAT line

max_rise_time (ID No IC10) + data_setup_time (ID No IC8) = 1000 + 250 = 1250 ns (according to the Standard-mode I2C-bus

specification) before the I2CLK line is released.

—ns

IC9

Bus free time between a STOP and START condition

4.7

—

1.3

—

μs

IC10

Rise time of both I2DAT and I2CLK signals

—

1000

—

300

IC11

Fall time of both I2DAT and I2CLK signals

—

300

—

300

IC12

Capacitive load for each bus line (Cb)

—

400

—

400

IC10

IC11

IC9

IC2

IC8

IC4

IC7

IC3

IC6

IC10

IC5

IC11

START

STOP

START

I2DAT

I2CLK

IC1

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