C8051F52X_12 Datasheet, PDF (34/221 Pages) Silicon Laboratories – 8/4/2 kB ISP Flash MCU Family

C8051F52x/F53x
Table 2.11. Internal Oscillator Electrical Characteristics
V_DD = 1.8 to 2.75 V, –40 to +125 °C unless otherwise specified; Using factory-calibrated settings.
Parameter
Oscillator Frequency¹
Conditions
IFCN = 111b
VDD > VREGMIN²
Min
Typ
Max
24.5 – 0.5% 24.5³ 24.5 + 0.5%
IFCN = 111b
VDD < VREGMIN²
Oscillator On
OSCICN[7:6] = 11b
Oscillator Suspend
OSCICN[7:6] = 00b
ZTCEN = 1
24.5 – 1.0% 24.5³ 24.5 + 1.0%
—
800
1100
Units
MHz
µA
Oscillator Supply Current
(from V_DD)
T = 25 °C
T = 85 °C
T = 125 °C
Oscillator Suspend
OSCICN[7:6] = 00b
ZTCEN = 0
—
67
—
µA
—
77
—
µA
—
117
300
µA
T = 25 °C
T = 85 °C
—
2
—
µA
—
3
—
µA
T = 125 °C
—
50
—
µA
Wake-Up Time From Sus- OSCICN[7:6] = 00b
—
—
1
µs
pend
ZTCEN = 0⁴
OSCICN[7:6] = 00b
ZTCEN = 1
—
5
—
Instruction
Cycles
Power Supply Sensitivity Constant Temperature
—
0.10
—
%/V
Temperature Sensitivity⁵ Constant Supply
TC₁
—
5.0
—
ppm/°C
TC₂
—
–0.65
—
ppm/°C²
Notes:
1. See Section “11.2.1. VDD Monitor Thresholds and Minimum VDD” on page 108 for minimum V_DD
requirements.
2. VREGMIN is the minimum output of the voltage regulator for its low setting (REG0CN: REG0MD = 0b). See
Table 2.6, “Voltage Regulator Electrical Specifications,” on page 30.
3. This is the average frequency across the operating temperature range.
4. See “20.7. Internal Oscillator Suspend Mode” on page 212 for ZTCEN setting in older silicon revisions.
5. 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.
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Rev. 1.4