CC1100ERGPR datasheet(49/97 Pages) TI

49 / 97 page

CC1100E

SWRS082

Page 49 of 92

RC oscillator calibration is turned off, it will

have to be manually turned on again if the

temperature

and/or

the

supply

voltage

changes. Refer to Application Note AN047 [7]

for further details.

19.6 Timing

The radio controller controls most of the timing

in the

CC1100E, such as synthesizer calibration,

PLL lock time, and RX/TX turnaround times.

Timing from IDLE to RX and IDLE to TX is

constant, dependent on the auto calibration

setting. RX/TX and TX/RX turnaround times

are constant. The calibration time is constant

18739 clock periods. Table 32 shows timing in

crystal clock cycles for key state transitions.

Power on time and XOSC start-up times are

variable, but within the limits stated in Table

11.

Note that in a frequency hopping spread

spectrum or a multi-channel protocol the

calibration time can be reduced from 721 µs to

approximately 150 µs. This is explained in

Section 28.2.

Description

XOSC

Periods

26 MHz

Crystal

IDLE to RX, no calibration

2298

88.4

μs

IDLE to RX, with calibration

~21037

809

μs

IDLE to TX/FSTXON, no

calibration

2298

88.4

μs

IDLE to TX/FSTXON, with

calibration

~21037

809

μs

TX to RX switch

560

21.5

μs

RX to TX switch

250

9.6

μs

RX or TX to IDLE, no calibration

0.1

μs

RX or TX to IDLE, with calibration

~18739

721

μs

Manual calibration

~18739

721

μs

Table 32: State Transition Timing

19.7 RX Termination Timer

The

CC1100E has optional functions for

automatic

termination

after

programmable time. The main use for this

functionality is Wake on Radio, but it may also

useful

for

other

applications.

The

termination timer starts when in RX state. The

timeout

programmable

with

the

MCSM2.RX_TIME

setting. When the timer

expires, the radio controller will check the

condition for staying in RX; if the condition is

not met, RX will terminate.

The programmable conditions are:



MCSM2.RX_TIME_QUAL=0

Continue

receive if sync word has been found



MCSM2.RX_TIME_QUAL=1

Continue

receive if sync word has been found, or if

the preamble quality is above threshold

(PQT)

If the system expects the transmission to have

started

when

enabling

the

receiver,

the

MCSM2.RX_TIME_RSSI

function can be used.

The radio controller will then terminate RX if

the first valid carrier sense sample indicates

no carrier (RSSI below threshold). See Section

17.4 on page 41 for details on Carrier Sense.

For ASK/OOK modulation, lack of carrier

sense is only considered valid after eight

symbol

periods.

Thus,

the

MCSM2.RX_TIME_RSSI

function can be used

in ASK/OOK mode when the distance between

“1” symbols is eight or less.

If RX terminates due to no carrier sense when

the MCSM2.RX_TIME_RSSI function is used,

or if no sync word was found when using the

MCSM2.RX_TIME

timeout function, the chip

will always go back to IDLE if WOR is disabled

and back to SLEEP if WOR is enabled.

Otherwise, the MCSM1.RXOFF_MODE setting

determines the state to go to when RX ends.

This means that the chip will not automatically

go back to SLEEP once a sync word has been

received. It is therefore recommended to

always wake up the microcontroller on sync

word detection when using WOR mode. This

can be done by selecting output signal 6 (see

Table

page

55)

one

the

programmable

GDO

output

pins,

and

programming the microcontroller to wake up

on an edge-triggered interrupt from this GDO

pin.

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