SI4010-C2-GT Silicon Laboratories Inc, SI4010-C2-GT Datasheet - Page 49

IC TX 27-960MHZ FSK 3.6V 10MSOP

SI4010-C2-GT

Manufacturer Part Number
SI4010-C2-GT
Description
IC TX 27-960MHZ FSK 3.6V 10MSOP
Manufacturer
Silicon Laboratories Inc
Series
EZRadio®r
Type
Crystalless SoC RF Transmitterr
Datasheet

Specifications of SI4010-C2-GT

Package / Case
10-MSOP
Mfg Application Notes
SI4010 Calculator Spreadsheet AppNote
Frequency
27MHz ~ 960MHz
Applications
Garage Openers, RKE, Security Alarms
Modulation Or Protocol
FSK, OOK
Data Rate - Maximum
100 kBaud
Power - Output
10dBm
Current - Transmitting
19.8mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Memory Size
4kB RAM
Features
8051 MCU Core, Crystal-less Operation
Voltage - Supply
1.8 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Operating Frequency
27 MHz to 960 MHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Operating Supply Voltage
1.8 V to 3.6 V
Supply Current
14.2 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
336-1997-5

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16. Crystal Oscillator (XO)
The crystal oscillator produces an accurate clock reference for applications demanding a high-accuracy
transmit carrier frequency. It uses a 1-pin crystal oscillator circuit (Colpitt's oscillator) and the output is con-
nected to the frequency counter. When crystal is used, the accuracy of the radio center frequency is deter-
mined by the parameters of the crystal (such as load capacitance, crystal accuracy, etc.) and the parasitic
of the PCB associated with the crystal circuit. To reduce the impact of these crystal parameters and to
guarantee safe startup of the oscillator, the user has to do the following:
16.1. Register Description
XREG Definition 16.1. bXO_CTRL
XREG Address = 0x4016
Name Reserved Reserved Reserved Reserved Reserved Reserved XO_LOWCAP XO_ENA
Reset
Bit
7:2
Type
1
0
Bit
Check the crystal data sheet for the “Cload” capacitor value that should be placed across the crystal’s
terminals to oscillate at the correct frequency
If Cload > 14 pF, XO_LOWCAP bit of the bXO_CTRL register have to be set to 0. In this case, the input
capacitance of the XTAL pin of the Si4010 is approximately 5.5 pF, so a (Cload – 5.5)pF capacitor
should be placed externally across the crystal terminals.
If Cload < 14 pF XO_LOWCAP bit of the bXO_CTRL register have to be set to 1. In this case, the input
capacitance of the XTAL pin of the Si4010 is approximately 3 pF, so the external capacitor placed
across the crystal has to be (Cload – 3)pF.
LOWCAP
Reserved
XO_ENA
Name
XO_
7
0
Reserved.
XO Low Capacitance.
Bit should be set for crystals that require less than 14 pF of total capacitance.
0: Crystal requires 14 pF or more of total capacitance.
1: Crystal requires less than 14 pF of total capacitance.
Enable XO.
Note that operation of the XO requires that the bandgap be enabled with the System
Module Function API. The input XO_CKGOOD status bit is in the SFR SYSTEM reg-
ister.
0: Crystal oscillator disabled.
1: Crystal oscillator enabled.
6
0
5
0
4
0
Rev. 1.0
Function
3
0
2
0
R/W
Si4010-C2
1
0
R/W
0
0
49

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