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Device Overview MC9S12G-Family
1.7.3.4
VDDA, VSSA — Power Supply Pins for DAC,ACMP, RVA, ADC and
Voltage Regulator
These are the power supply and ground input pins for the digital-to-analog converter, the analog
comparator, the reference voltage attenuator, the analog-to-digital converter and the voltage regulator.
NOTE
On some packages VDDA is connected with VDDXR and the common pin
is named VDDXRA.
On some packages the VSSA is connected to VSSX and the common pin is
named VSSXA. See section Section 1.8, “Device Pinouts ” for further
details.
1.7.3.5
VRH — Reference Voltage Input Pin
V RH is the reference voltage input pin for the digital-to-analog converter and the analog-to-digital
converter. Refer to Section 1.18, “ADC VRH/VRL Signal Connection ” for further details.
On some packages VRH is tied to VDDA or VDDXRA. Refer to section 1.8
Device Pinouts for further details.
1.7.3.6
Power and Ground Connection Summary
Table 1-7. Power and Ground Connection Summary
Mnemonic
VDDR
VSS
VDDX [3:1]
VSSX [3:1]
VDDX
VSSX
VDDA
VSSA
VDDXR
VDDXRA
VSSXA
VRH
Nominal Voltage
3.15V – 5.0 V
0V
3.15V – 5.0 V
0V
3.15V – 5.0 V
0V
3.15V – 5.0 V
0V
3.15V – 5.0 V
3.15V – 5.0 V
0V
3.15V – 5.0 V
Description
External power supply for internal voltage regulator.
Return ground for the logic supply generated by the internal regulator
External power supply for I/O drivers. The 100-pin package features 3 I/O supply pins.
Return ground for I/O drivers. The100-pin package provides 3 ground pins
External power supply for I/O drivers, All packages except 100-pin feature 1 I/O supply.
Return ground for I/O drivers. All packages except 100-pin provide 1 I/O ground pin.
External power supply for the analog-to-digital converter and for the reference circuit of the
internal voltage regulator.
Return ground for VDDA analog supply
External power supply for I/O drivers and internal voltage regulator. For the 48-pin package
the VDDX and VDDR supplies are combined on one pin.
External power supply for I/O drivers, internal voltage regulator and analog-to-digital
converter. For the 20- and 32-pin package the VDDX, VDDR and VDDA supplies are
combined on one pin.
Return ground for I/O driver and VDDA analog supply
Reference voltage for the analog-to-digital converter.
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
61
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