PCD5008H datasheet(22/64 Pages) PHILIPS

22 / 64 page

1998 Jun 17

Philips Semiconductors

Product speciﬁcation

FLEX

™ Pager Decoder

PCD5008

8.5.5

RECEIVER WARM-UP SEQUENCES

8.5.5.1

Normal receiver warm-up sequence

The PCD5008 allows for up to 6 steps associated with

warming up the receiver. When the PCD5008 turns on the

receiver while decoding, it starts the warm-up sequence

160 ms before it requires valid signals at the EXTS1 and

EXTS0 input pins.

1. The PCD5008 leaves the receiver control lines in the

off state for the programmed warm-up off time.

2. The first warm-up setting, if enabled, is applied to the

receiver control lines for the amount of time

programmed for that setting.

3. Subsequent warm-up settings are applied to the

receiver control lines for their corresponding time until

a disabled warm-up setting is found.

4. At the end of the last used warm-up setting, the

1600 symbols per second (sps) sync setting or the

3200 sps sync setting is applied to the receiver control

lines depending on the PCD5008 current state.

The PCD5008 must be configured such that the sum of all

of the used warm-up times and the warm-up off time does

not exceed 160 ms.

If it exceeds 160 ms, the PCD5008 executes the receiver

shut-down sequence 160 ms after the start of the warm-up

off time. If the sum of all of the used warm-up times and the

warm-up off times is less than 160 ms, the receiver

remains in the 1600 sps sync setting or the 3200 sps sync

setting from the end of the last used warm-up setting until

valid signals are expected (160 ms after the start of the

warm-up off time). Figure 12 shows the receiver warm-up

sequence while decoding, when all warm-up settings are

enabled.

8.5.5.2

First receiver warm-up sequence

When the PCD5008 is turned on by setting the ON bit in

the control packet, the receiver warm-up sequence differs

from the sequence described in Section 8.5.5.1. After the

ON bit is set no receiver warm-up off time is applied,

instead the PCD5008 immediately begins to apply the

receiver warm-up settings. When a disabled warm-up

setting is found, the decoder applies 3200 sps sync setting

to the receiver control lines. The decoder then expects

valid signals after the 3200 sps sync warm-up time.

Figure 13 shows the receiver warm-up sequence when the

PCD5008 is first turned on and when all warm-up settings

are enabled.

Fig.12 Receiver warm-up sequence while decoding.

handbook, full pagewidth

MGK265

receiver

control

line setting

warm up

off time

warm up

time 1

warm up

setting 1

possible

LOBAT

check

off

warm up

time 2

warm up

setting 2

possible

LOBAT

check

possible

LOBAT

check

warm up

time 3

160 ms

warm up

setting 3

possible

LOBAT

check

warm up

time 4

warm up

setting 4

possible

LOBAT

check

warm up

time 5

warm up

setting 5

possible

LOBAT

check

1600 sps or 3200 sps

sync setting

EXTS1 & EXTS0

signals are expected

to be valid here

Fig.13 First receiver warm-up sequence after turning decoding on.

handbook, full pagewidth

MGK266

receiver

control

line setting

warm up

time 1

warm up

setting 1

possible

LOBAT

check

off

warm up

time 2

warm up

setting 2

possible

LOBAT

check

possible

LOBAT

check

warm up

time 3

warm up

setting 3

possible

LOBAT

check

warm up

time 4

warm up

setting 4

possible

LOBAT

check

warm up

time 5

warm up

setting 5

possible

LOBAT

check

3200 sps sync

warm up

time

3200 sps

sync setting

EXTS1 & EXTS0

signals are expected

to be valid here

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