MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 285

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

20.10 Trimmed Accuracy of the Internal Clock Generator
20.10.1 2.7-Volt to 3.3-Volt Trimmed Internal Clock Generator Characteristics
20.10.2 4.5-Volt to 5.5-Volt Trimmed Internal Clock Generator Characteristics
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA
Absolute trimmed internal oscillator tolerance
Variation over temperature
Variation over voltage
Absolute trimmed internal oscillator tolerance
Variation over temperature
Variation over voltage
1. These specifications concern long-term frequency variation. Each measurement is taken over a 1-ms period.
2. Absolute value of variation in ICG output frequency, trimmed at nominal V
3. Specification is characterized but not tested.
4. Variation in ICG output frequency for a fixed N and voltage
5. Variation in ICG output frequency for a fixed N
1. These specifications concern long-term frequency variation. Each measurement is taken over a 1-ms period.
2. Absolute value of variation in ICG output frequency, trimmed at nominal V
3. Specification is characterized but not tested.
4. Variation in ICG output frequency for a fixed N and voltage
5. Variation in ICG output frequency for a fixed N
–40 C to 85 C
–40 C to 125 C
25 C
–40 C to 85 C
–40 C to 125 C
–40 C to 85 C
–40 C to 125 C
25 C
–40 C to 85 C
–40 C to 125 C
are allowed to vary for a single given setting of N.
are allowed to vary for a single given setting of N.
Characteristic
Characteristic
(3), (5)
(3), (5)
(3), (4)
(3), (4)
The unadjusted frequency of the low-frequency base clock (IBASE),
when the comparators in the frequency comparator indicate zero error,
can vary as much as ±25% due to process, temperature, and voltage.
The trimming capability exists to compensate for process affects. The
remaining variation in frequency is due to temperature, voltage, and
change in target frequency (multiply register setting). These affects are
designed to be minimal, however variation does occur. Better
performance is seen at 3 V and lower settings of N.
(1)
(1)
Electrical Specifications
(2), (3)
(2), (3)
Symbol
Symbol
V
V
F
F
V
V
ar_temp
ar_temp
abs_tol
abs_tol
ar_volt
ar_volt
Trimmed Accuracy of the Internal Clock Generator
DD
DD
Min
Min
—
—
—
—
—
—
—
—
—
—
—
—
and temperature, as temperature and V
and temperature, as temperature and V
0.03
0.05
Typ
Typ
2.5
4.0
0.5
0.7
0.7
4.0
5.0
1.0
1.0
1.0
Electrical Specifications
Max
0.05
Max
10.0
0.08
5.0
5.7
2.0
2.0
2.0
7.0
2.0
2.0
2.0
Technical Data
Unit
%/C
Unit
%/C
%/V
%/V
%
%
DD
DD
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