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RF68

Symbol

Description

Conditions

Min

Typ

Max

Unit

FXOSC

Crystal Oscillator Frequency

-

-

-

22

24

26

-

-

-

MHz

MHz

MHz

DFXOSC

Frequency Variation of the XOSC

No crystal contribution

-

-

+/-25

ppm

Timing Specifications

TS_TR

Time from Sleep to Tx mode

XTAL dependant, with spec’d XTAL

-

650

2000

us

TS_HOP0

Channel hop time in Band 0

315 to 390 MHz

-

250

500

us

TS_HOP1

Channel hop time in Band 1

Maximum hop of 26 MHz***

-

200

400

us

TOFFT

Timer from Tx data activity to

Sleep

Programmable

-

-

2

20

-

-

ms

ms

RAMP

PA Ramp up and down time

-

20

-

us

T_START

Time before CTRL pin mode

selection.

Time from power on to sampling of

CTRL **

-

200 us

+ TS_OSC

-

ms

* With different matching networks

** The oscillator startup time, TS_OSC, depends on the electrical characteristics of the crystal

*** From the last CTRL falling edge of the Frequency change instruction to transmitter ready (PA ramp up finished)

3. Timing Characteristics

The following table gives the operating specifications for the TWI interface of the RF68.

Table 5

Serial Interface Timing Specifications

Symbol

Description

Conditions

Min

Typ

Max

Unit

CTRL Clock Frequency

-

-

10

MHz

CTRL Clock High time

45

-

-

ns

CTRL Clock Low time

45

-

-

ns

CTRL Clock rise time

-

-

5

ns

CTRL Clock Fall time

-

-

5

ns

DATA Setup time

From Data transition to CTRL rising

edge

45

-

-

ns

DATA hold time

From CTRL rising edge to DATA

transition

45

-

-

ns

Time at “1” on DATA during

Recovery command

See Figure 9 and Figure 10

-

-

5

us

Time at “0” on DATA during

Recovery command

See Figure 10

5

-

-

us