Datasheet

Device Overview MC9S12G-Family

MC9S12G Family Reference Manual, Rev.1.23

Freescale Semiconductor 61

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

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 Nominal Voltage Description

VDDR 3.15V – 5.0 V External power supply for internal voltage regulator.

VSS 0V Return ground for the logic supply generated by the internal regulator

VDDX

[3:1]

3.15V – 5.0 V External power supply for I/O drivers. The 100-pin package features 3 I/O supply pins.

VSSX

[3:1]

0V Return ground for I/O drivers. The100-pin package provides 3 ground pins

VDDX 3.15V – 5.0 V External power supply for I/O drivers, All packages except 100-pin feature 1 I/O supply.

VSSX 0V Return ground for I/O drivers. All packages except 100-pin provide 1 I/O ground pin.

VDDA 3.15V – 5.0 V External power supply for the analog-to-digital converter and for the reference circuit of the

internal voltage regulator.

VSSA 0V Return ground for VDDA analog supply

VDDXR 3.15V – 5.0 V 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.

VDDXRA 3.15V – 5.0 V 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.

VSSXA 0V Return ground for I/O driver and VDDA analog supply

VRH 3.15V – 5.0 V Reference voltage for the analog-to-digital converter.