mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 280

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
19.7 I/O Signals
19.7.1 ADC Analog Power Pin (V
19.7.2 ADC Analog Ground Pin (V
19.7.3 ADC Voltage In (ADCVIN)
Technical Data
278
NOTE:
NOTE:
The ADC module has 12 channels that are shared with I/O port B and
port D. Refer to
next three subsections.
The ADC analog portion uses V
the V
filtering may be necessary to ensure clean V
results.
V
Connect the V
V
Route V
bypass capacitors as close as possible to the package.
The ADC analog portion uses V
pin to the same voltage potential as V
V
to a voltage potential between V
desired lower conversion boundary.
In a 52-pin package V
ADCVIN is the input voltage signal from one of the 12 ADC channels to
the ADC module.
REFH
DDAREF
REFL
DDA
is the lower reference supply for the ADC. Connect the V
is the high reference voltage for all analog-to-digital conversions.
DDA
/V
/V
Analog-to-Digital Converter (ADC)
DDA
DDA
DDAREF
/V
SSA
DDAREF
REFH
/V
23.7 ADC Characteristics
depending on the desired upper conversion boundary.
)/ADC Voltage Reference Low Pin (V
DDAREF
pin to the same voltage potential as V
pin to a voltage potential between 1.5 volts and
SSA
carefully for maximum noise immunity and place
)/ADC Voltage Reference Pin (V
and V
SSA
DDA
SSA
REFL
/V
as its ground pin. Connect the V
and 0.5 volts depending on the
are bonded together.
DDAREF
SS
.
for voltages referenced in the
DDA
as its power pin. Connect
/V
Freescale Semiconductor
DDAREF
REFL
MC68HC08QA24
DD
REFH
for good
. External
)
REFL
)
SSA
pin