I.MX27 datasheet(47/152 Pages) FREESCALE

Part #	I.MX27

Description	Multimedia Applications Processor Multiple clock and power domains

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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i.MX27 and i.MX27L Data Sheet, Rev. 1.7

Freescale Semiconductor

47

Electrical Characteristics

Figure 4. Reset and Presence Pulses (RPP) Timing Diagram

Figure 5 depicts Write 0 Sequence timing, and Table 18 lists the timing parameters.

Figure 5. Write 0 Sequence Timing Diagram

Figure 6 depicts Write 1 Sequence timing, Figure 7 depicts the Read Sequence timing, and Table 19 lists

the timing parameters.

Figure 6. Write 1 Sequence Timing Diagram

Table 17. RPP Sequence Delay Comparisons Timing Parameters

ID

Parameters

Symbol

Min

Typical

Max

Units

OW1

Reset Time Low

tRSTL

480

511

µs

OW2

Presence Detect High

tPDH

15

—

60

µs

OW3

Presence Detect Low

tPDL

60

—

240

µs

OW4

Reset Time High

tRSTH

480

512

—

Table 18. WR0 Sequence Timing Parameters

ID

Parameter

Symbol

Min

Typical

Max

Units

OW5

Write 0 Low Time

tWR0_low

60

100

120

µs

OW6

Transmission Time Slot

tSLOT

OW5

117

120

µs

One-Wire bus

DS2502 Tx

“Presence Pulse”

(BATT_LINE)

1-Wire Tx

“Reset Pulse”

OW1

OW2

OW3

OW4

OW5

OW6

One-Wire bus

(BATT_LINE)

OW7

OW8

One-Wire bus

(BATT_LINE)

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