HC05V7GRSSLASHD datasheet(23/170 Pages) NXP

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SECTION 1: GENERAL DESCRIPTION

Page 9

MC68HC05V7 Specification Rev. 1.0

1.5

FUNCTIONAL PIN DESCRIPTION

The following paragraphs give a description of the general function of each pin.

1.5.1

VBATT

Power is supplied to the device through the VBATT pin. The on-chip voltage regulator uses

this voltage to derive the internal VDD supply for the MCU. The VBATT pin is also used to

power the MDLC and should still be connected even when the Voltage Regulator is not

used. See SECTION 7 POWER SUPPLY AND REGULATION.

1.5.2

VDD AND VSS

These pins are provided to allow the internally generated VDD supply to be externally

decoupled. The short rise and fall times of the MCU supply current transients place very

high short-duration current demands on the internal power supply. To prevent noise

problems, special care should be taken to provide good power supply bypassing at the

MCU by using bypass capacitors with good high-frequency characteristics that are

positioned as close to the MCU supply pins as possible. Two sets of VDD and VSS pins are

required to maintain on-chip supply noise to within acceptable limits. Each supply pin pair

will require its own decoupling capacitor. See SECTION 7

POWER SUPPLY AND

REGULATION.

1.5.3

VSSA1

VSSA1 is a separate ground pad, which provides a ground return for the A/D subsystem. To

prevent digital noise contamination, this pin should be connected directly to a low

impedance ground reference point.

1.5.4

VSSA2

VSSA2 is a separate ground pad, which provides a ground return for the MDLC analog

subsystem. To prevent digital noise contamination, this pin should be connected directly to

a low impedance ground reference point.

1.5.5

VCCA

VCCA is a separate supply pin providing power to the analog subsystems of the MDLC and

A/D converter. This pin should be connected to the VDD pin externally. To prevent

contamination from the digital supply, this pin should be adequately decoupled to a low

impedance ground reference. See SECTION 7 POWER SUPPLY AND REGULATION.

1.5.6

VREFH AND VREFL

VREFH is the positive (high) reference voltage for the A/D subsystem. VREFL is the negative

(low) reference voltage for the A/D subsystem. VREFH and VREFL should be isolated from

the digital supplies to prevent any loss of accuracy from the A/D converter.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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