MCIMX503CVM8B datasheet(82/134 Pages) FREESCALE

82 / 134 page

i.MX50 Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

Electrical Characteristics

4.9.6

One-Wire (OWIRE) Timing Parameters

Figure 42 depicts the RPP timing, and Table 59 lists the RPP timing parameters.

Figure 42. Reset and Presence Pulses (RPP) Timing Diagram

IC4

Data hold time

3.452

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

—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

20 + 0.1Cb

300

IC11

Fall time of both I2DAT and I2CLK signals

—

300

20 + 0.1Cb

300

IC12

Capacitive load for each bus line (Cb)

—

400

—

400

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

falling edge of I2CLK.

2 The maximum hold time has only to be met if the device does not stretch the LOW period (ID no IC5) of the I2CLK signal.

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 No IC7)

of 250 ns must be met. This automatically is 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 (IC9) + data_setup_time (IC7) = 1000 + 250 = 1250 ns (according to the Standard-mode I2C-bus specification)

before the I2CLK line is released.

4 C

b = total capacitance of one bus line in pF.

Table 58. I2C Module Timing Parameters (continued)

Parameter

Standard Mode

Supply Voltage =

1.65 V–1.95 V, 2.7 V–3.3 V

Fast Mode

Supply Voltage =

2.7 V–3.3 V

Unit

Min

Max

Min

Max

One-Wire bus

One Wire Device Tx

“Presence Pulse”

(BATT_LINE)

One-WIRE Tx

“Reset Pulse”

OW1

OW2

OW3

OW4

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