CC113LRGPR.B datasheet(39/87 Pages) TI2

39 / 87 page

CC113L

www.ti.com

SWRS108B – MAY 2011 – REVISED JUNE 2014

NOTE

When MCSM1.RXOFF_MODE=11 and a packet has been received, it will take some time

before a valid RSSI value is present in the RSSI register again even if the radio has never

exited RX mode. This time is the same as the RSSI response time discussed in DN505

SWRA114.

The SIDLE command strobe can always be used to force the radio controller to go to the IDLE state.

5.13.5 RX Termination

the

system

expects

the

transmission

have

started

when

entering

mode,

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 5.12.3 for details on Carrier

Sense.

For 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 OOK mode when the distance between two “1” symbols

is eight or less.

If RX terminates due to no carrier sense when the MCSM2.RX_TIME_RSSI function is used, the radio will

always go back to IDLE, regardless of the MCSM1.RXOFF_MODE setting.

5.13.6 Timing

5.13.6.1 Overall State Transition Times

The main radio controller needs to wait in certain states in order to make sure that the internal

analog/digital parts have settled down and are ready to operate in the new states. A number of factors are

important for the state transition times:

•

The crystal oscillator frequency, fxosc

•

The value of the TEST0, TEST1, and FSCAL3 registers

Table 5-12 shows timing in crystal clock cycles for key state transitions.

Table 5-12. Overall State Transition Times [Example for 26-MHz Crystal Oscillator, 250 kBaud Data Rate,

and TEST0 = 0x0B (Maximum Calibration Time)].

Description

Transition Time (FREND0.PA_POWER=0)

Transition Time [µs]

IDLE to RX, no calibration

1953/fxosc

75.1

IDLE to RX, with calibration

1953/fxosc + FS calibration Time

799

RX to IDLE, no calibration

2/fxosc

~0.1

RX to IDLE, with calibration

2/fxosc + FS calibration Time

724

Manual calibration

283/fxosc + FS calibration Time

735

5.13.6.2 Frequency Synthesizer Calibration Time

Table 5-13 summarizes the frequency synthesizer (FS) calibration times for possible settings of TEST0

and FSCAL3.CHP_CURR_CAL_EN. Setting FSCAL3.CHP_CURR_CAL_EN to 00b disables the charge

pump calibration stage. TEST0 is set to the values recommended by SmartRF Studio software . The

possible values for TEST0 when operating with different frequency bands are 0x09 and 0x0B. SmartRF

Studio software always sets FSCAL3.CHP_CURR_CAL_EN to 10b.

The calibration time can be reduced from 712/724 µs to 145/157 µs. See for more details.

Detailed Description

Submit Documentation Feedback

Product Folder Links: CC113L

CC113LRGPR.B датащи(PDF) 39 Page - Texas Instruments

CC113LRGPR.B датащи(HTML) 39 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87

датащи скачать

ссылки URL