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17.7 Application information
This section contains information for using the ADC module in applications. The ADC
has been designed to be integrated into a microcontroller for use in embedded control
applications requiring an A/D converter.
17.7.1 External pins and routing
The following sections discuss the external pins associated with the ADC module and
how they are used for best results.
17.7.1.1 Analog supply pins
The ADC module has analog power and ground supplies (V
separate pins on some devices. V
some devices. On other devices, V
pins. In these cases, there are separate 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
voltage potential as their corresponding MCU digital supply (V
routed carefully for maximum 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
connection between these supplies if possible. The V
ground location.
17.7.1.2 Analog reference pins
In addition to the analog supplies, the ADC module has connections for two reference
voltage inputs. The high reference is V
V
on some devices. The low reference is V
DDA
pin as V
on some devices.
SSA
NXP Semiconductors
is shared on the same pin as the MCU digital V
SSA
and V
SSA
DDA
DDA
pin. This should be the only ground
SSA
, which may be shared on the same pin as
REFH
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 17 Analog-to-digital converter (ADC)
and V
DDA
are shared with the MCU digital supply
and V
must be connected to the same
SSA
DD
pin makes a good single point
SSA
, which may be shared on the same
REFL
) available as
SSA
SS
and V
) and must be
SS
on
283
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