SC33690DS datasheet(11/26 Pages) NXP

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Standalone Configuration with One-Wire Bus

MC33690 Standalone Tag Reader Circuit, Rev. 5

Freescale Semiconductor

Figure 6. Mode Access Description in One-Wire Bus Configuration

Figure 7. Configuration A State Diagram

7.1

Timing Definitions for a 8 MHz Crystal

The timing definitions for a 8 MHz crystal are:

•Tref is crystal oscillator period (125 ns typ.)

•T0=8064.Tref = 1.008ms typ.

•T0’=7932.Tref = 0.992ms typ.

•T1=16256.Tref = 2.032ms typ.

•T1’=16128.Tref = 2.016ms typ.

•T2=4096.Tref, = 512µs typ.

T0 is the minimum time required to guarantee the device toggles from read to write (or from write to read). However, the STARC

may toggle from read to write (or from write to read) between T0 and T0’.

T1 is the minimum time required to guarantee the device toggles from write to standby. However, the STARC may toggle in

standby between T1 and T1’.

K line

T0 £ t < T0’+T1’

read mode

write mode

K line

t ŠT0

read mode

write mode

K line

t Š T1

standby mode

write mode

Read to write mode:

Write to read mode:

Write to standby mode:

Standby mode to read mode:

standby mode

read mode

wake-up sequence

K line

acknowledge

Read

write

TD1/2

Write

TD1/2 off

Standby

T0 £ K line low

K line high < T0’

T1 £ K line low

T0 £ K line high

Wake-up

K line low

Reset

switching

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