39.3.1 FVRCON

FVR Control Register

Important: This register is shared between the Fixed Voltage Reference (FVR) module and the temperature indicator module.

Note:

This output goes to the DAC and comparator modules and to the ADC module as an input channel only.
Fixed Voltage Reference output cannot exceed V_DD.
This output goes to the ADC module as a reference and as an input channel.
It is highly recommended to disable the buffer prior to modifying the gain settings.

Name:	FVRCON
Address:	0x3D7


Bit	7	6	5	4	3	2	1	0
	EN	RDY	TSEN	TSRNG	CDAFVR[1:0]		ADFVR[1:0]
Access	R/W	R	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	q	0	0	0	0	0	0

Bit 7 – EN Fixed Voltage Reference Enable

Value	Description
1	Enables module
0	Disables module

Bit 6 – RDY Fixed Voltage Reference Ready Flag

Value	Description
1	Fixed Voltage Reference output is ready for use
0	Fixed Voltage Reference output is not ready for use or not enabled

Bit 5 – TSEN Temperature Indicator Enable

Value	Description
1	Temperature Indicator is enabled
0	Temperature Indicator is disabled

Bit 4 – TSRNG Temperature Indicator Range Selection

Value	Description
1	V_OUT = 3V_T (High Range)
0	V_OUT = 2V_T (Low Range)

Bits 3:2 – CDAFVR[1:0] FVR Buffer 2 Gain Selection⁽¹⁾⁽⁴⁾

Value	Description
11	FVR Buffer 2 Gain is 4x, (4.096V)⁽²⁾
10	FVR Buffer 2 Gain is 2x, (2.048V)⁽²⁾
01	FVR Buffer 2 Gain is 1x, (1.024V)
00	FVR Buffer 2 is OFF

Bits 1:0 – ADFVR[1:0] FVR Buffer 1 Gain Selection⁽³⁾⁽⁴⁾

Value	Description
11	FVR Buffer 1 Gain is 4x, (4.096V)⁽²⁾
10	FVR Buffer 1 Gain is 2x, (2.048V)⁽²⁾
01	FVR Buffer 1 Gain is 1x, (1.024V)
00	FVR Buffer 1 is OFF

This output goes to the DAC and comparator modules and to the ADC module as an input channel only. Fixed Voltage Reference output cannot exceed VDD. This output goes to the ADC module as a reference and as an input channel. It is highly recommended to disable the buffer prior to modifying the gain settings.