MC912DG128ACPV Freescale Semiconductor, MC912DG128ACPV Datasheet - Page 200

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MC912DG128ACPV

Manufacturer Part Number
MC912DG128ACPV
Description
IC MCU 128K FLASH 8MHZ 112-LQFP
Manufacturer
Freescale Semiconductor
Series
HC12r
Datasheet

Specifications of MC912DG128ACPV

Core Processor
CPU12
Core Size
16-Bit
Speed
8MHz
Connectivity
CAN, I²C, SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
69
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 16x8/10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
112-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Oscillator
13.4.1.2 Internal Parasitic Reduction
13.4.1.3 Bias Current Process Optimization
Technical Data
200
Any oscillator circuit’s gain margin is reduced when a low AC-impedance
(low resistance or high capacitance) is placed in parallel with the
resonator. In the Colpitts oscillator configuration, this impedance is
dominated by the parasitic capacitance from the EXTAL pin to VSS.
Since this capacitance is large compared to the shunt capacitance of the
resonator, the gain margin in a Colpitts configuration is less than in other
configurations.
To remedy this issue, the internal circuits were optimized for lower
capacitance. This should increase the gain margin and allow more
robust operation over process, temperature and voltage variation. To
maximize the benefit of this change, different external component values
are required. However, the oscillator will function at least as well as the
MC68HC912DT128A version with the same components.
For proper oscillation, the gain margin of the oscillator must exceed one
or the circuit will not oscillate. Due to the sensitive gain margin of the
Colpitts configuration, process variance in the bias current (which
controls the gain of the amplifier) can cause the gain margin to be much
lower than typical. This can be as a result of either too much or too little
current.
To reduce the process sensitivity of the gain, the material of the device
that sets the bias current was changed to a material with tighter process
and temperature control. As a result, the transconductance and Ibias
variances are more limited than in the previous design.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Oscillator
MC68HC912DT128A — Rev 4.0
MOTOROLA

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