mc9s08jm60 Freescale Semiconductor, Inc, mc9s08jm60 Datasheet - Page 157
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mc9s08jm60
Manufacturer Part Number
mc9s08jm60
Description
Hcs08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08JM60.pdf
(386 pages)
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10.6.1.1
The ADC module has analog power and ground supplies (V
on some devices. V
devices, V
pads for the analog supplies bonded to the same pin as the corresponding digital supply so that some degree
of isolation between the supplies is maintained.
When available on a separate pin, both V
as their corresponding MCU digital supply (V
noise immunity and bypass capacitors placed as near as possible to the package.
If separate power supplies are used for analog and digital power, the ground connection between these
supplies must be at the V
possible. The V
10.6.1.2
In addition to the analog supplies, the ADC module has connections for two reference voltage inputs. The
high reference is V
reference is V
When available on a separate pin, V
driven by an external source between the minimum V
never exceed V
potential as V
capacitors placed as near as possible to the package.
AC current in the form of current spikes required to supply charge to the capacitor array at each successive
approximation step is drawn through the V
current demand is a 0.1 μF capacitor with good high frequency characteristics. This capacitor is connected
between V
path is not recommended because the current causes a voltage drop that could result in conversion errors.
Inductance in this path must be minimum (parasitic only).
10.6.1.3
The external analog inputs are typically shared with digital I/O pins on MCU devices. The pin I/O control
is disabled by setting the appropriate control bit in one of the pin control registers. Conversions can be
performed on inputs without the associated pin control register bit set. It is recommended that the pin
control register bit always be set when using a pin as an analog input. This avoids problems with contention
because the output buffer is in its high impedance state and the pullup is disabled. Also, the input buffer
draws DC current when its input is not at V
as analog inputs should be done to achieve lowest operating current.
Empirical data shows that capacitors on the analog inputs improve performance in the presence of noise
or when the source impedance is high. Use of 0.01 μF capacitors with good high-frequency characteristics
is sufficient. These capacitors are not necessary in all cases, but when used they must be placed as near as
possible to the package pins and be referenced to V
Freescale Semiconductor
SSAD
REFH
Analog Supply Pins
Analog Reference Pins
Analog Input Pins
SSAD
REFL
DDAD
SSAD
and V
and V
. V
, which may be shared on the same pin as V
REFH
SSAD
). When available on a separate pin, V
pin makes a good single point ground location.
REFH
DDAD
REFL
, which may be shared on the same pin as V
SSAD
is shared on the same pin as the MCU digital V
and V
and must be placed as near as possible to the package pins. Resistance in the
are shared with the MCU digital supply pins. In these cases, there are separate
pin. This should be the only ground connection between these supplies if
REFL
MC9S08JM60 Series Data Sheet, Rev. 2
REFH
must be routed carefully for maximum noise immunity and bypass
DDAD
may be connected to the same potential as V
REFH
DD
DD
or V
and V
and V
and V
SS
SSA
SSAD
. Setting the pin control register bits for all pins used
REFL
DDAD
.
SS
must be connected to the same voltage potential
) and must be routed carefully for maximum
loop. The best external component to meet this
REFL
DDAD
spec and the V
SSAD
must be connected to the same voltage
and V
DDAD
on some devices.
Analog-to-Digital Converter (S08ADC12V1)
SSAD
SS
on some devices. The low
DDAD
on some devices. On other
) available as separate pins
potential (V
DDAD
, or may be
REFH
must
157
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