RFM68W Datasheet, PDF (7/20 Pages) List of Unclassifed Manufacturers – Low Cost ISM Transmitter Module

RFM68W
RFM68W
Symbol Description
Conditions
Min
FXOSC Crystal Oscillator Frequency
For 315MHz Module
For 433,868,915MHz Module
DFXOSC Frequency Variation of the XOSC No crystal contribution
-
Timing Specifications
TS_TR
Time from Sleep to Tx mode
XTAL dependant, with spec’d XTAL
-
TS_HOP0 Channel hop time in Band 0
315 to 390 MHz -
TS_HOP1 Channel hop time in Band 1
Maximum hop of 26 MHz*** -
TOFFT
Timer from Tx data activity to
Sleep
Programmable -
-
RAMP
PA Ramp up and down time
-
T_START Time before CTRL pin mode
selection.
Time from power on to sampling of
-
CTRL **
Typ
Max Unit
24
MHz
26
MHz
-
+/-25 ppm
650
250
200
2
20
20
200 us
+ TS_OSC
2000 us
500 us
400 us
- ms
- ms
- us
- 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 RFM68W.
Table 5 Serial Interface Timing Specifications
Symbol Description
f_CTRL
t_ch
t_cl
t_rise
t_fall
t_setup
CTRL Clock Frequency
CTRL Clock High time
CTRL Clock Low time
CTRL Clock rise time
CTRL Clock Fall time
DATA Setup time
t_hold
DATA hold time
t₀, t₂
t₁
Time at “1” on DATA during
Recovery command
Time at “0” on DATA during
Recovery command
Conditions
From Data transition to CTRL rising
edge
From CTRL rising edge to DATA
transition
See Figure 9 and Figure 10
Min Typ Max Unit
-
-
10 MHz
45
-
- ns
45
-
- ns
-
-
5 ns
-
-
5 ns
45
-
- ns
45
-
- ns
-
-
5 us
See Figure 10
5
-
- us
7
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