PIC16 datasheet(129/418 Pages) MICROCHIP

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 2011-2013 Microchip Technology Inc.

DS40001609C-page 129

PIC16(L)F1508/9

13.0 FIXED VOLTAGE REFERENCE

(FVR)

The Fixed Voltage Reference (FVR) is a stable voltage

reference, independent of VDD, with a nominal output

level (VFVR) of 1.024V. The output of the FVR can be

configured to supply a reference voltage to the

following:

• ADC input channel

• Comparator positive input

• Comparator negative input

The FVR can be enabled by setting the FVREN bit of

the FVRCON register.

13.1

Independent Gain Amplifier

The output of the FVR supplied to the peripherals,

(listed above), is routed through a programmable gain

amplifier. Each amplifier can be programmed for a gain

of 1x, 2x or 4x, to produce the three possible voltage

levels.

The ADFVR<1:0> bits of the FVRCON register are

used to enable and configure the gain amplifier settings

for the reference supplied to the ADC module. Refer-

ence Section 15.0 “Analog-to-Digital Converter

(ADC) Module” for additional information.

The CDAFVR<1:0> bits of the FVRCON register are

used to enable and configure the gain amplifier settings

for the reference supplied to the comparator modules.

Reference Section 17.0 “Comparator Module” for

additional information.

To minimize current consumption when the FVR is

disabled, the FVR buffers should be turned off by

clearing the Buffer Gain Selection bits.

13.2

FVR Stabilization Period

When the Fixed Voltage Reference module is enabled, it

requires time for the reference and amplifier circuits to

stabilize. Once the circuits stabilize and are ready for use,

the FVRRDY bit of the FVRCON register will be set. See

the FVR Stabilization Period characterization graph,

Figure 30-65.

FIGURE 13-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

ADFVR<1:0>

CDAFVR<1:0>

FVR_buffer1

(To ADC Module)

FVR_buffer2

(To Comparators)

FVREN

FVRRDY

Note 1

Rev. 10-000053A

8/6/2013

Note 1: Any peripheral requiring the Fixed Reference (See Table 13-1)

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