Datasheet

270
8018P–AVR–08/10
ATmega169P
HOLD Input
Sample & Hold signal.
Sample analog signal
when low. Hold signal
when high. If differential
amplifier is used, this
signal must go active
when ACLK is high.
11
IREFEN Input
Enables Band-gap
reference as AREF
signal to DAC
00
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
00
NEGSEL_1 Input
Input Mux for negative
input for differential
signal, bit 1
00
NEGSEL_0 Input
Input Mux for negative
input for differential
signal, bit 0
00
PASSEN Input
Enable pass-gate of
differential amplifier.
11
PRECH Input
Precharge output latch of
comparator. (Active low)
11
SCTEST Input
Switch-cap TEST enable.
Output from differential
amplifier is sent out to
Port Pin having ADC_4
00
ST Input
Output of differential
amplifier will settle faster
if this signal is high first
two ACLK periods after
AMPEN goes high.
00
VCCREN Input
Selects Vcc as the ACC
reference voltage.
00
Table 25-3. Boundary-scan Signals for the ADC
(1)
Signal
Name
Direction
as Seen
from the
ADC Description
Recommen-
ded Input
when not in
use
Output Values when
Recommended Inputs
are Used, and CPU is
not Using the ADC