C8051F521-C-IM View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F521-C-IM

8/4/2 kB ISP Flash MCU Family

Silicon Laboratories 

C8051F52x/F53x

Table 2.11. Internal Oscillator Electrical Characteristics

VDD = 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 VDD)

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 VDD

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.

34

Rev. 1.4

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