C8051F55x/56x/57x
42
Rev. 1.1
Table 5.6. Internal High-Frequency Oscillator Electrical Characteristics
VDD = 1.8 to 2.75 V, –40 to +125 °C unless otherwise specified; Using factory-calibrated settings.
Parameter
Conditions
Min
Typ
Max
Units
Oscillator Frequency
IFCN = 111b;
VDD > VREGMIN1
IFCN = 111b;
VDD < VREGMIN1
24 – 0.5%
24 – 1.0%
242
24 + 0.5%
24 + 1.0%
MHz
Oscillator Supply Current
(from VDD)
Internal Oscillator On
OSCICN[7:6] = 11b
—
880
1300
A
Internal Oscillator Suspend
OSCICN[7:6] = 00b
ZTCEN = 1
Temp = 25 °C
Temp = 85 °C
Temp = 125 °C
—
67
90
130
—
Wake-up Time From Suspend
OSCICN[7:6] = 00b
—
1
—
s
Power Supply Sensitivity
Constant Temperature
—
0.11
—
%/V
Temperature Sensitivity3
Constant Supply
TC1
TC2
—
5.0
–0.65
—
ppm/°C
ppm/°C2
1. VREGMIN is the minimum output of the voltage regulator for its low setting (REG0CN: REG0MD = 0b). See
2. This is the average frequency across the operating temperature range
3. Use temperature coefficients
TC1 and TC2 to calculate the new internal oscillator frequency using the
following equation:
f(T) = f0 x (1 + TC1 x (T - T0) + TC2 x (T - T0)
2)
where f0 is the internal oscillator frequency at 25 °C and T0 is 25 °C.