SI4330-B1-FMR Silicon Laboratories Inc, SI4330-B1-FMR Datasheet - Page 25
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SI4330-B1-FMR
Manufacturer Part Number
SI4330-B1-FMR
Description
IC RX ISM 240-960MHZ 20VQFN
Manufacturer
Silicon Laboratories Inc
Specifications of SI4330-B1-FMR
Frequency
240MHz ~ 960MHz
Sensitivity
-121dBm
Data Rate - Maximum
256 kbps
Modulation Or Protocol
FSK, GFSK, OOK
Applications
Remote Control, RKE, Security Systems
Current - Receiving
18.5mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Features
RSSI Equipped
Voltage - Supply
1.8 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
20-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SI4330-B1-FMR
Manufacturer:
HIROSE
Quantity:
3 200
Part Number:
SI4330-B1-FMR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
3.5.2. Easy Frequency Programming for FHSS
While Registers 73h–77h may be used to program the carrier frequency of the Si4330, it is often easier to think in
terms of “channels” or “channel numbers” rather than an absolute frequency value in Hz. Also, there may be some
timing-critical applications (such as for Frequency Hopping Systems) in which it is desirable to change frequency
by programming a single register. Once the channel step size is set, the frequency may be changed by a single
register corresponding to the channel number. A nominal frequency is first set using Registers 73h–77h, as
described above. Registers 79h and 7Ah are then used to set a channel step size and channel number, relative to
the nominal setting. The Frequency Hopping Step Size (fhs[7:0]) is set in increments of 10 kHz with a maximum
channel step size of 2.56 MHz. The Frequency Hopping Channel Select Register then selects channels based on
multiples of the step size.
For example, if the nominal frequency is set to 900 MHz using Registers 73h–77h, the channel step size is set to
1 MHz using "Register 7Ah. Frequency Hopping Step Size," and "Register 79h. Frequency Hopping Channel
Select" is set to 5d, the resulting carrier frequency would be 905 MHz. Once the nominal frequency and channel
step size are programmed in the registers, it is only necessary to program the fhch[7:0] register in order to change
the frequency.
3.5.3. Automatic State Transition for Frequency Change
If registers 79h or 7Ah are changed in RX mode, the state machine will automatically transition the chip back to
TUNE and change the frequency. This feature is useful to reduce the number of SPI commands required in a
Frequency Hopping System. This in turn reduces microcontroller activity, reducing current consumption.
Add R/W
79
7A
R/W Frequency Hopping Channel
R/W
Function/Description
Frequency Hopping Step
Select
Size
F
carrier
Fnom
fhch[7] fhch[6] fhch[5] fhch[4] fhch[3] fhch[2] fhch[1] fhch[0]
fhs[7]
D7
fhs
fhs[6]
D6
[
: 7
Rev 1.0
] 0
fhs[5]
D5
(
fhch
fhs[4]
[
D4
: 7
] 0
fhs[3]
10
D3
kHz
)
fhs[2]
D2
fhs[1]
D1
Si4330-B1
fhs[0]
D0
POR Def.
00h
00h
25