SI4330-B1-FM Silicon Laboratories Inc, SI4330-B1-FM Datasheet - Page 42

• Manufacturer Part Number: SI4330-B1-FM
• Description: IC RCVR ISM 960MHZ 3.6V 20-QFN
• Manufacturer: Silicon Laboratories Inc
• Type: ISM Receiverr

Specifications of SI4330-B1-FM

• Package / Case: 20-QFN
• Frequency: 960MHz
• Sensitivity: -118dBm
• Data Rate - Maximum: 128kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Current - Receiving: 18.5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 240 MHz to 960 MHz
• Operating Supply Voltage: 3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 18.5 mA
• Package: 20QFN EP
• Maximum Data Rate: 256 Kbps
• Transmission Media Type: Wireless
• Power Supply Type: Analog
• Typical Operating Supply Voltage: 3 V
• Minimum Operating Supply Voltage: 1.8 V
• Maximum Operating Supply Voltage: 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1629-5; SI4330-V2-FM

Si4330-B1
8.3. General Purpose ADC
An 8-bit SAR ADC is integrated for general purpose use, as well as for digitizing the on-chip temperature sensor
reading. Registers 0Fh "ADC Configuration", 10h "Sensor Offset" and 4Fh "Amplifier Offset" can be used to
configure the ADC operation.
Every time an ADC conversion is desired, bit 7 "adcstart/adcbusy" in “Register 1Fh. Clock Recovery Gearshift
Override” must be set to 1. This is a self clearing bit that will be reset to 0 at the end of the conversion cycle of the
ADC. The conversion time for the ADC is 350 µs. After this time or when the "adcstart/adcbusy" bit is cleared, then
the ADC value may be read out of register 11h "ADC Value".
The architecture of the ADC is shown in Figure 19. The signal and reference inputs of the ADC are selected by
adcsel[2:0] and adcref[1:0] in “Register 0Fh. ADC Configuration,” respectively. The default setting is to read out the
temperature sensor using the bandgap voltage (VBG) as reference. With the VBG reference the input range of the
ADC is from 0–1.02 V with an LSB resolution of 4 mV (1.02/255). Changing the ADC reference will change the LSB
resolution accordingly.
A differential multiplexer and amplifier are provided for interfacing external bridge sensors. The gain of the amplifier
is selectable by adcgain[1:0] in Register 0Fh. The majority of sensor bridges have supply voltage (VDD) dependent
gain and offset. The reference voltage of the ADC can be changed to either V
dependent offset voltage can be added using soffs[3:0] in register 10h.
See “AN448: General Purpose ADC Configuration” for more details on the usage of the general purpose ADC.
42
Add
0F
10
11
R/W
R/W
R/W
R
Function/Description
ADC Configuration
Sensor Offset
ADC Value
GPIO0
GPIO1
GPIO2
Temperature Sensor
V
V
V
DD
DD
BG
(1.2V)
/ 3
/ 2
Figure 19. General Purpose ADC Architecture
adcsel [2:0]
Diff. MUX
adcstart/adcbusy
adc[7]
D7
aoffs [4:0]
adcgain [1:0]
Diff. Amp.
adcsel[2] adcsel[1]
adc[6]
soffs [3:0]
D6
Rev 1.0
adc[5]
D5
adcsel [2:0]
Input MUX
adcref [1:0]
Ref MUX
adcsel[0]
adc[4]
D4
V
V
adcref[1]
soffs[3]
in
ref
adc[3]
D3
0 -1020mV / 0-255
8-bit ADC
DD
/2 or V
adcref[0]
soffs[2]
adc[2]
D2
DD
adc [7:0]
adcgain[1] adcgain[0]
/3. A programmable V
soffs[1]
adc[1]
D1
soffs[0]
adc[0]
D0
POR Def.
00h
00h
—
DD