SI1011-A-GM Silicon Laboratories Inc, SI1011-A-GM Datasheet - Page 261

• Manufacturer Part Number: SI1011-A-GM
• Description: IC TXRX MCU + EZRADIOPRO
• Manufacturer: Silicon Laboratories Inc

Specifications of SI1011-A-GM

• Package / Case: 42-QFN
• Frequency: 240MHz ~ 960MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Applications: General Purpose
• Power - Output: 20dBm
• Sensitivity: -121dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 18.5mA
• Current - Transmitting: 85mA
• Data Interface: PCB, Surface Mount
• Memory Size: 8kB Flash, 768B 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: 20 dBm
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 4 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, GFSK, OOK
• Protocol Supported: C2, SMBus
• Core: 8051
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 768 B
• Supply Current (max): 4 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1872-5

23.3.8. TX Data Rate Generator
The data rate is configurable between 0.123–256 kbps. For data rates below 30 kbps the ”txdtrtscale” bit in
register 70h should be set to 1. When higher data rates are used this bit should be set to 0 .
The TX date rate is determined by the following formula in bps:
For data rates higher than 100 kbps, Register 58h should be changed from its default of 80h to C0h. Non-
optimal modulation and increased eye closure will result if this setting is not made for data rates higher
than 100 kbps. The txdr register is only applicable to TX mode and does not need to be programmed for
RX mode. The RX bandwidth which is partly determined from the data rate is programmed separately.
23.4. Modulation Options
23.4.1. Modulation Type
The EZRadioPRO transceivers support three different modulation options: Gaussian Frequency Shift Key-
ing (GFSK), Frequency Shift Keying (FSK), and On-Off Keying (OOK). GFSK is the recommended modu-
lation type as it provides the best performance and cleanest modulation spectrum. Figure 23.6
demonstrates the difference between FSK and GFSK for a Data Rate of 64 kbps. The time domain plots
demonstrate the effects of the Gaussian filtering. The frequency domain plots demonstrate the spectral
benefit of GFSK over FSK. The type of modulation is selected with the modtyp[1:0] bits in "Register 71h.
Modulation Mode Control 2". Note that it is also possible to obtain an unmodulated carrier signal by setting
modtyp[1:0] = 00.
Add R/W
6E
6F
R/W TX Data Rate 1
R/W TX Data Rate 0
Description
Function/
modtyp[1:0]
00
01
10
11
AFC disabled
AFC enabled
txdr[15] txdr[14] txdr[13] txdr[12] txdr[11]
txdr[7]
D7
GFSK (enable TX Data CLK when direct mode is used)
txdr[15:0]
DR_TX (bps)
txdr[6]
D6
Freq Offset Register
=
DR_TX(bps) 2
-------------------------------------------------------------------------------- -
txdr[5]
D5
Rev. 1.0
AFC
=
RX
Unmodulated Carrier
Modulation Source
Frequency Correction
txdr 15:0
------------------------------------------------ -
2
16
txdr[4]

1 MHz
+

D4
5
OOK

FSK
16
txdtrtscale
 1 MHz
+

5

txdr[3]
Freq Offset Register
Freq Offset Register
txdtrtscale
D3
txdr[10]
Si1010/1/2/3/4/5
txdr[2]
TX
D2
txdr[9] txdr[8]
txdr[1] txdr[0]
D1
D0
POR Def.
3Dh
0Ah
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