mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 35

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1.7.3
MC9S12VR-Family power and ground pins are described below. Because fast signal transitions place
high, short-duration current demands on the power supply, use bypass capacitors with high-frequency
characteristics and place them as close to the MCU as possible.
1.7.3.1
VDDX1 and VDDX2 are the 5V power supply output for the I/O drivers. This voltage is generated by the
on chip voltage regulator. Bypass requirements on VDDX1 and VDDX2 pins depend on how heavily the
MCU pins are loaded. All VDDX pins are connected together internally. All VSSX pins are connected
together internally.
1.7.3.2
These are the power supply and ground input pins for the analog-to-digital converter and the voltage
regulator.
1.7.3.3
The voltage supply of nominally 1.8V is generated by the internal voltage regulator. The return current
path is through the VSS pin.
1.7.3.4
LGND is the the ground pin for the LIN physical layer LINPHY.
1.7.3.5
LSGND is the shared ground pin for the low-side drivers.
Freescale Semiconductor
Power Supply Pins
VDDX1, VDDX2, VSSX1,VSSX2 — Power Output Pins and Ground Pins
VDDA, VSSA — Power Supply Pins for ADC
VSS — Core Ground Pin
LGND — LINPHY Ground Pin
LSGND — Ground Pin for Low-Side Drivers
All ground pins must be connected together in the application.
The high side driver ground pin VSSXHS mentioned in
“High-Side Drivers - HSDRV (S12HSDRV1)
VSSX2 ground pin.
Not all power and ground pins are available on all packages. Refer to pinout
section for further details.
The reference voltages VRH and VRL mentioned in
Electrical Specifications
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
are internally connected to VDDA and VSSA.
NOTE
NOTE
NOTE
NOTE
is internally connected to
Appendix C, “ATD
Chapter 13,
Device Overview MC9S12VR-Family
35