Si1000/1/2/3/4/5
SFR Definition 5.15. REF0CN: Voltage Reference Control
Bit
Name
Type
Reset
R
0
R
0
7
6
5
REFGND
R/W
0
R/W
1
4
REFSL
R/W
1
3
2
TEMPE
R/W
0
R
0
1
0
REFOE
R/W
0
SFR Page = 0x0; SFR Address = 0xD1
Bit
Name
7:6
5
Unused
Read = 00b; Write = Don’t Care.
Function
REFGND
Analog Ground Reference.
Selects the ADC0 ground reference.
0: The ADC0 ground reference is the GND pin.
1: The ADC0 ground reference is the P0.1/AGND pin.
4:3
REFSL
Voltage Reference Select.
Selects the ADC0 voltage reference.
00: The ADC0 voltage reference is the P0.0/VREF pin.
01: The ADC0 voltage reference is the VDD_MCU pin.
10: The ADC0 voltage reference is the internal 1.8 V digital supply voltage.
11: The ADC0 voltage reference is the internal 1.65 V high speed voltage reference.
2
TEMPE
Temperature Sensor Enable.
Enables/Disables the internal temperature sensor.
0: Temperature Sensor Disabled.
1: Temperature Sensor Enabled.
1
0
Unused
REFOE
Read = 0b; Write = Don’t Care.
Internal Voltage Reference Output Enable.
Connects/Disconnects the internal voltage reference to the P0.0/VREF pin.
0: Internal 1.68 V Precision Voltage Reference disabled and not connected to
P0.0/VREF.
1: Internal 1.68 V Precision Voltage Reference enabled and connected to
P0.0/VREF.
5.12. Voltage Reference Electrical Specifications
See Table 4.11 on page 61 for detailed Voltage Reference Electrical Specifications.
Rev. 1.0
97
SILABS [ SILICON LABORATORIES ]
