SI4020-I1-FT Silicon Laboratories Inc, SI4020-I1-FT Datasheet - Page 22

• 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

Push-button 1:
Short Explanation:
Note:
• This routine is repeatedly executed while PB1 is pressed, because continuous execution was selected at POR (CA1E code issued in the
RX-TX ALIGNMENT PROCEDURES
RX-TX frequency offset can be caused only by the differences in the actual reference frequency. To minimize these errors it is
suggested to use the same crystal type and the same PCB layout for the crystal placement on the RX and TX PCBs.
To verify the possible RX-TX offset it is suggested to measure the CLK output of both chips with a high level of accuracy. Do not
measure the output at the XTL pin since the measurement process itself will change the reference frequency. Since the carrier
frequencies are derived from the reference frequency, having identical reference frequencies and nominal frequency settings at the
TX and RX side there should be no offset if the CLK signals have identical frequencies.
It is possible to monitor the actual RX-TX offset using the AFC status report included in the status byte of the receiver. By reading out
the status byte from the receiver, the actual measured offset frequency will be reported. In order to get accurate values the AFC has
to be disabled during the read by clearing the "en" bit in the AFC Control Command (bit 0).
00000080
00000090
000000A0
000000B0
000000C0
000000D0
000000E0
000000F0
Address
power-on reset section before).
E6–E7
80–81
82–83
84–85
86–E5
Command
88
55
55
55
55
55
55
00
C6
C4
8
A
72
55
55
55
55
55
55
00
A6
55
55
55
55
55
55
00
Parameter
60x55
10
55
55
55
55
55
55
00
872
610
60
00
C6
55
55
55
55
55
55
00
60
55
55
55
55
55
55
00
Related Control Command
Configuration Control
Frequency
Data Transmit
Sleep
C4
55
55
55
55
55
55
00
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
Remarks
433MHz band, Xtal C
f
Transmit the next 96 bytes
Data
Power down, go to address 80 (see note)
c
=(43+1552/4000)*10MHz
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
L
=12pF f
55
55
55
55
55
55
00
00
55
55
55
55
55
55
00
00
dev
=90kHz
Si4020
22