si4430 Silicon Laboratories, si4430 Datasheet - Page 93

• Manufacturer Part Number: si4430
• Description: Si4430 Ism Transceiver
• Manufacturer: Silicon Laboratories

Register 0Fh. ADC Configuration
Reset value = 00000000
Name
Type
Bit
6:4
3:2
1:0
Bit
7
adcstart/adc-
adcgain[1:0]
adcstart/
adcdone
adcsel[2:0]
adcref[1:0]
R/W
Name
D7
done
ADC Measurement Start Bit.
Reading this bit gives 1 if the ADC measurement cycle has been finished.
ADC Input Source Selection.
The internal 8-bit ADC input source can be selected as follows:
000:
001:
010:
011:
100:
101:
110:
111:
ADC Reference Voltage Selection.
The reference voltage of the internal 8-bit ADC can be selected as follows:
0X:
10:
11:
ADC Sensor Amplifier Gain Selection.
The full scale range of the internal 8-bit ADC in differential mode (see adcsel) can be set
as follows:
adcref[0] = 0:
FS = 0.014 x (adcgain[1:0] + 1) x VDD FS = 0.021 x (adcgain[1:0] + 1) x VDD
D6
Internal Temperature Sensor
GPIO0, single-ended
GPIO1, single-ended
GPIO2, single-ended
GPIO0(+) – GPIO1(–), differential
GPIO1(+) – GPIO2(–), differential
GPIO0(+) – GPIO2(–), differential
GND
bandgap voltage (1.2 V)
VDD / 3
VDD / 2
adcsel[2:0]
R/W
D5
adcref[0] = 1:
Preliminary Rev. 0.4
D4
Function
D3
adcref[1:0]
R/W
D2
D1
adcgain[1:0]
Si4430
R/W
D0
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