SI4020-I1-FT Silicon Laboratories Inc, SI4020-I1-FT Datasheet - Page 15

• Manufacturer Part Number: SI4020-I1-FT
• Description: IC TX FSK 915MHZ 5.4V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4020-I1-FT

• Package / Case: 16-TSSOP
• Frequency: 315MHz, 433MHz, 868MHz, and 915MHz
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 256 kbps
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.4 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 315 MHz to 915 MHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2.2 V to 5.4 V
• Supply Current: 1.5 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1621-5

3. Frequency Setting Command
The 12-bit parameter of the Frequency Setting Command
<f11 : f0> has the value F. The value F should be in the range
of 96 and 3903. When F is out of range, the previous value is
kept. The synthesizer center frequency f
Note:
• For correct operation of the frequency synthesizer, the frequency and band of operation need to be programmed before the
• When coding for the Si4020, it is suggested that recalibration routines be added to compensate for significant changes in
4. Data Rate Command
In EEPROM mode the transmitted bit rate is determined by the 8-bit value R (bits <r7 : r0>) as:
Apart from setting custom values, the standard bit rates from 2.4 to 115.2 kbps can be approximated with minimal error.
The commands are read out with a different fixed bit rate:
5. Power Setting Command
The bit ook enables the OOK mode for the PA, in this case the data to be transmitted are received through the FSK pin.
bit
synthesizer is started. Directly after activation of the synthesizer, the RF VCO is calibrated to ensure proper operation in the
programmed frequency band.
temperature and supply voltages.
bit
bit
15
15
p2
1
1
7
1
f
BR = 10 MHz / 29 / (R+1)
F
0
0
0
0
1
1
1
1
0
sck
= 10 MHz * C1 * (C2 + F/4000)
= 10 MHz / 29 / 3 [~115.2 kHz]
p1
14
14
0
0
0
1
1
0
0
1
1
1
6
0
p0
13
13
0
1
0
1
0
1
0
1
1
0
5
1
Relative Output Power [dB]
12
12
0
0
4
1
ook
f11
11
11
1
3
-12
-15
-18
-21
f10
-3
-6
-9
10
10
p2
0
0
2
0
can be calculated as:
p1
f9
9
9
0
1
p0
f8
8
8
0
0
f7
r7
7
7
POR
B0h
f6
r6
6
6
maximum available power, which depends on the actual
The output power is given in the table as relative to the
antenna impedance. (See: Antenna Application Note
The constants C1 and C2 are determined by
the selected band as:
f5
r5
available from www.silabs.com/integration).
5
5
f4
r4
4
4
Band [MHz]
f3
r3
3
3
315
433
868
915
r2
f2
2
2
r1
f1
1
1
C1
1
1
2
3
f0
r0
0
0
C2
31
43
43
30
A7D0h
C800h
POR
POR
Si4020
15