Datasheet

Signal Name Direction as
Seen from
the ADC
Description Recommend
ed Input
when not in
Use
Output
Values when
Recommend
ed Inputs
are Used,
and CPU is
not Using
the ADC
IREFEN Input Enables Band-gap reference as AREF
signal to DAC
0 0
MUXEN_7 Input Input Mux bit 7 0 0
MUXEN_6 Input Input Mux bit 6 0 0
MUXEN_5 Input Input Mux bit 5 0 0
MUXEN_4 Input Input Mux bit 4 0 0
MUXEN_3 Input Input Mux bit 3 0 0
MUXEN_2 Input Input Mux bit 2 0 0
MUXEN_1 Input Input Mux bit 1 0 0
MUXEN_0 Input Input Mux bit 0 1 1
NEGSEL_2 Input Input Mux for negative input for differential
signal, bit 2
0 0
NEGSEL_1 Input Input Mux for negative input for differential
signal, bit 1
0 0
NEGSEL_0 Input Input Mux for negative input for differential
signal, bit 0
0 0
PASSEN Input Enable pass-gate of gain stages. 1 1
PRECH Input Precharge output latch of comparator.
(Active low)
1 1
SCTEST Input Switch-cap TEST enable. Output from x10
gain stage send out to Port Pin having
ADC_4
0 0
ST Input Output of gain stages will settle faster if this
signal is high first two ACLK periods after
AMPEN goes high.
0 0
VCCREN Input Selects Vcc as the ACC reference voltage. 0 0
Note: 1. Incorrect setting of the switches in Figure 29-12 Analog to Digital Converter on page 350 will
make signal contention and may damage the part. There are several input choices to the S&H circuitry on
the negative input of the output comparator in Figure 29-12 Analog to Digital Converter on page 350.
Make sure only one path is selected from either one ADC pin, Bandgap reference source, or Ground.
If the ADC is not to be used during scan, the recommended input values from the table above should be
used. The user is recommended not to use the Differential Gain stages during scan. Switch-Cap based
Atmel ATmega64A [DATASHEET]
Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015
352