I.MX27 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

View to exact match

I.MX27

Multimedia Applications Processor

Freescale Semiconductor 

One-Wire bus

(BATT_LINE)

1-Wire Tx

“Reset Pulse”

DS2502 Tx

“Presence Pulse”

OW2

Electrical Characteristics

OW1

OW3

OW4

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

Table 17. RPP Sequence Delay Comparisons Timing Parameters

ID

Parameters

OW1

OW2

OW3

OW4

Reset Time Low

Presence Detect High

Presence Detect Low

Reset Time High

Symbol

tRSTL

tPDH

tPDL

tRSTH

Min

Typical

Max

480

511

15

—

60

60

—

240

480

512

—

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

One-Wire bus

(BATT_LINE)

OW6

Units

µs

µs

µs

—

OW5

Figure 5. Write 0 Sequence Timing Diagram

Table 18. WR0 Sequence Timing Parameters

ID

OW5

OW6

Parameter

Write 0 Low Time

Transmission Time Slot

Symbol

tWR0_low

tSLOT

Min

60

OW5

Typical

Max

Units

100

120

µs

117

120

µs

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

the timing parameters.

One-Wire bus

(BATT_LINE)

OW8

OW7

Figure 6. Write 1 Sequence Timing Diagram

i.MX27 and i.MX27L Data Sheet, Rev. 1.8

Freescale Semiconductor

47

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