SI1005-C-GM Silicon Laboratories Inc, SI1005-C-GM Datasheet - Page 249

• Manufacturer Part Number: SI1005-C-GM
• Description: IC TXRX MCU + EZRADIOPRO
• Manufacturer: Silicon Laboratories Inc

Specifications of SI1005-C-GM

• Package / Case: 42-QFN
• Frequency: 240MHz ~ 960MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Applications: General Purpose
• Power - Output: 13dBm
• Sensitivity: -121dBm
• Voltage - Supply: 0.9 V ~ 1.8 V
• Current - Receiving: 18.5mA
• Current - Transmitting: 30mA
• Data Interface: PCB, Surface Mount
• Memory Size: 32kB Flash, 4kB RAM
• Antenna Connector: PCB, Surface Mount
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 240 MHz to 960 MHz
• Interface Type: UART, SMBus, SPI, PCA
• Output Power: 13 dBm
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 4.1 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, GFSK, OOK
• Protocol Supported: C2, SMBus
• Core: 8051
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 4352 B
• Supply Current (max): 4.1 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1875-5

Add R/W
Add R/W
23.3.6. Frequency Offset Adjustment
When the AFC is disabled the frequency offset can be adjusted manually by fo[9:0] in registers 73h and
74h. It is not possible to have both AFC and offset as internally they share the same register. The fre-
quency offset adjustment and the AFC both are implemented by shifting the Synthesizer Local Oscillator
frequency. This register is a signed register so in order to get a negative offset it is necessary to take the
twos complement of the positive offset number. The offset can be calculated by the following:
The adjustment range in high band is ±160 kHz and in low band it is ±80 kHz. For example to compute an
offset of +50 kHz in high band mode fo[9:0] should be set to 0A0h. For an offset of –50 kHz in high band
mode the fo[9:0] register should be set to 360h.
23.3.7. Automatic Frequency Control (AFC)
All AFC settings can be easily obtained from the settings calculator. This is the recommended method to
program all AFC settings. This section is intended to describe the operation of the AFC in more detail to
help understand the trade-offs of using AFC.The receiver supports automatic frequency control (AFC) to
compensate for frequency differences between the transmitter and receiver reference frequencies. These
differences can be caused by the absolute accuracy and temperature dependencies of the reference crys-
tals. Due to frequency offset compensation in the modem, the receiver is tolerant to frequency offsets up to
0.25 times the IF bandwidth when the AFC is disabled. When the AFC is enabled, the received signal will
be centered in the pass-band of the IF filter, providing optimal sensitivity and selectivity over a wider range
of frequency offsets up to 0.35 times the IF bandwidth. The trade-off of receiver sensitivity (at 1% PER)
versus carrier offset and the impact of AFC are illustrated in Figure 23.5.
71
72
73
74
R/W
R/W
R/W
R/W
Frequency Devia-
Modulation Mode
Frequency Offset
Frequency Offset
Description
Description
Function/
Function/
Control 2
tion
DesiredOff
trclk[1] trclk[0] dtmod[1] dtmod[0] eninv fd[8] modtyp[1] modtyp[0]
fd[7]
D7
fo[7]
D7
fo
[
fd[6]
: 9
set
D6
] 0
fo[6]

D6

156
156
fd[5]
D5
.
Rev. 1.0
25
.
DesiredOff
25
fo[5]
Hz
D5
Hz

fd[4]

D4
(
hbsel
(
hbsel
fo[4]
D4
set
fd[3]

D3

) 1
) 1

fo[3]
fd[2]
D3
fo
D2
Si1000/1/2/3/4/5
[
: 9
] 0
fd[1]
D1
fo[2]
D2
fo[1]
fo[9]
D1
fd[0]
D0
fo[0]
fo[8]
D0
POR Def.
00h
20h
POR
Def.
00h
00h
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