Datasheet

Figure 52-7. Analog Full Scale Ranges in Single-Ended/Differential Applications Versus Gain
VIN+
gain=1
gain=
gain=
2
4
V
VREFN
=0
V
VREFP
(½)V
VREFP
(¾)V
VREFP
(¼)V
VREFP
(½)V
VREFP
V
VREFP
(
5
/8)V
VREFP
(
3
/8)V
VREFP
(½)V
VREFP
(¼)V
VREFP
(¾)V
VREFP
(00)
(01)
(10 or 11)
VIN+
VIN-
VIN+
VIN-
VIN+
VIN-
VIN+
VIN+
V
VREFP
Single-ended
Fully dif
ferential
V
VREFN
=0
V
VREFN
=0
52.6.12 AFE Timings
Each AFE has its own minimal startup time configured in AFEC_MR.STARTUP.
WARNING
No input buffer amplifier to isolate the source is included in the AFE. This must be taken into consideration.
52.6.13 Temperature Sensor
The temperature sensor is internally connected to channel index 11.
The AFEC manages temperature measurement in several ways. The dif
ferent methods of measurement depend on
the configuration bits TRGEN in the AFEC_MR and CH11 in AFEC_CHSR.
Temperature measurement can be triggered at the same rate as other channels by enabling the conversion channel
11.
If AFEC_CHSR.CH11 is enabled, the temperature sensor analog cell is switched on. If a user sequence is used, the
last converted channel of the sequence is always the temperature sensor channel.
A manual start can be performed only if AFEC_MR.TRGEN is disabled. When AFEC_CR.START is set, the
temperature sensor channel conversion is scheduled together with the other enabled channels (if any). The result of
the conversion is placed in an internal register that can be read in the AFEC_CDR (AFEC_CSELR must be
programmed accordingly prior to reading AFEC_CDR) and the associated flag EOC11 is set in the AFEC_ISR.
SAM E70/S70/V70/V71 Family
Analog Front-End Controller (AFEC)
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1663