SI1005-C-GM Silicon Laboratories Inc, SI1005-C-GM Datasheet - Page 280

• 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
Si1000/1/2/3/4/5
an incorrect error may rarely occur. The RSSI value may be incorrect if read during the update period. The
update period is approximately 10 ns every 4 Tb. For 10 kbps, this would result in a 1 in 40,000 probability
that the RSSI may be read incorrectly. This probability is extremely low, but to avoid this, one of the follow-
ing options is recommended: majority polling, reading the RSSI value within 1 Tb of the RSSI interrupt, or
using the RSSI threshold described in the next paragraph for Clear Channel Assessment (CCA).
For CCA, threshold is programmed into rssith[7:0] in "Register 27h. RSSI Threshold for Clear Channel
Indicator." After the RSSI is evaluated in the preamble, a decision is made if the signal strength on this
channel is above or below the threshold. If the signal strength is above the programmed threshold then the
RSSI status bit, irssi, in "Register 04h. Interrupt/Status 2" will be set to 1. The RSSI status can also be
routed to a GPIO line by configuring the GPIO configuration register to GPIOx[3:0] = 1110.
23.9. Reference Design
Reference designs are available at
mended schematics, BOM, and layout. TX matching component values for the different frequency bands
can be found in the application notes “AN435: Si4032/4432 PA Matching” and “AN436:
Si4030/4031/4430/4431 PA Matching.” RX matching component values for different frequency bands can
be found in “AN427: EZRadioPRO Si433x and Si443x RX LNA Matching.”
280
26
27
R/W
R
250
200
150
100
50
0
-120
RSSI Threshold for Clear Channel Indicator rssith[7]
Received Signal Strength Indicator
Function/Description
-100
Figure 23.25. RSSI Value vs. Input Power
-80
www.silabs.com
RSSI vs Input Power
rssi[7]
D7
-60
Rev. 1.0
In Pow [dBm]
rssith[6]
rssi[6]
D6
for many common applications which include recom-
rssith[5]
rssi[5]
D5
-40
rssith[4]
rssi[4]
D4
rssith[3]
-20
rssi[3]
D3
rssith[2]
rssi[2]
D2
0
rssith[1]
rssi[1]
D1
rssith[0]
rssi[0]
D0
20
POR
Def.
00h
—