CC2430 Datasheet, PDF (132/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
ADCCON3 (0xB6) – ADC Control 3
Bit Name
7:6 _EREF[1:0]
5:4 _EDIV[1:0]
3:0 _ECH[3:0]
Reset R/W
00
R/W
00
R/W
0000 R/W
Description
Selects reference voltage used for the extra conversion
00
Internal 1.25V reference
01
External reference on AIN7 pin
10
AVDD_SOC pin
11
External reference on AIN6-AIN7 differential input
Sets the decimation rate used for the extra conversion. The
decimation rate also determines the resolution and time required to
complete the conversion.
00
64 dec rate (8 bits resolution)
01
128 dec rate (10 bits resolution)
10
256 dec rate (12 bits resolution)
11
512 dec rate (13 bits resolution)
Extra channel select. Selects the channel number of the extra
conversion that is carried out after a conversion sequence has
ended. This bit field must be written for an extra conversion to be
performed. If the ADC is not running, writing to these bits will
trigger an immediate single conversion from the selected extra
channel. The bits are automatically cleared when the extra
conversion has finished.
0000 AIN0
0001 AIN1
0010 AIN2
0011 AIN3
0100 AIN4
0101 AIN5
0110 AIN6
0111 AIN7
1000 AIN0-AIN1
1001 AIN2-AIN3
1010 AIN4-AIN5
1011 AIN6-AIN7
1100 GND
1101 Positive voltage reference
1110 Temperature sensor
1111 VDD/3
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 132 of 232