RF65 datasheet(30/72 Pages) ETC2

30 / 72 page

Page 30

RF65

Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

4. Operating Modes

4.1. Basic Modes

The circuit can be set in 4 different basic modes which are described in Table 12.

By default, when switching from a mode to another one, the sub-blocks are woken up according to a pre-defined and

optimized sequence. Alternatively, these operating modes can be selected directly by disabling the automatic sequencer

(SequencerOff in RegOpMode = 1).

Table 12 Basic Receiver Modes

ListenOn

in RegOpMode

Mode

in RegOpMode

Selected mode

Enabled blocks

0 0 0

Sleep Mode

None

0 0 1

Stand-by Mode

Top regulator and crystal oscillator

0 1 0

FS Mode

Frequency synthesizer

1 0 0

Receive Mode

Frequency synthesizer and receiver

Listen Mode

See Listen Mode, section 4.3

4.2. Automatic Sequencer and Wake-Up Times

By default, when switching from one operating mode to another, the circuit takes care of the sequence of events in such a

way that the transition timing is optimized. For example, when switching from Sleep mode to Receive mode, the RF65

goes first to Standby mode (XO started), then to frequency synthesizer mode, and finally, when the PLL has locked, to

Receive mode.



The crystal oscillator wake-up time, TS_OSC, is directly related to the time for the crystal oscillator to reach its steady

state. It depends notably on the crystal characteristics.



The frequency synthesizer wake-up time, TS_FS, is directly related to the time needed by the PLL to reach its steady

state. The signal PLL_LOCK, provided on an external pin, gives an indication of the lock status. It goes high when the

PLL reaches its locking range.

Three specific cases can be highlighted:

Receiver Wake Up time from Sleep mode

= TS_OSC + TS_FS + TS_RE

Receiver Wake Up time from Sleep mode, AGC enabled

= TS_OSC + TS_FS + TS_RE_AGC

Receiver Wake Up time from Sleep mode, AGC and AFC enabled

= TS_OSC + TS_FS + TS_RE_AGC&AFC

These timings are detailed in section 4.2.1.

In applications where the target average power consumption, or the target startup time, do not require setting the RF65 in

the lowest power modes (Sleep or Standby), the respective timings TS_OSC and TS_FS in the former equations can be

omitted.

4.2.1. Receiver Startup Time

It is highly recommended to use the built-in sequencer of the RF65, to optimize the delays when setting the chip in

receive mode. It guarantees the shortest startup times, hence the lowest possible energy usage, for battery operated

systems.

The startup times of the receiver can be calculated from the following:

RF65 Datasheet(PDF) 30 Page - List of Unclassifed Manufacturers

RF65 Datasheet(HTML) 30 Page - List of Unclassifed Manufacturers

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

Datasheet Download

Link URL