C8051F012 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F012

Mixed-Signal 32KB ISP FLASH MCU Family

Silicon Laboratories 

C8051F000/1/2/5/6/7

C8051F010/1/2/5/6/7

Figure 9.2. REF0CN: Reference Control Register

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

-

-

-

-

-

TEMPE BIASE REFBE

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Bits7-3: UNUSED. Read = 00000b; Write = don’t care

Bit2: TEMPE: Temperature Sensor Enable Bit

0: Internal Temperature Sensor Off.

1: Internal Temperature Sensor On.

Bit1: BIASE: Bias Enable Bit for ADC and DAC’s

0: Internal Bias Off.

1: Internal Bias On (required for use of ADC or DAC’s).

Bit0: REFBE: Internal Voltage Reference Buffer Enable Bit

0: Internal Reference Buffer Off. System reference can be driven from external source on

VREF pin.

1: Internal Reference Buffer On. System reference provided by internal voltage reference.

Reset Value

00000000

SFR Address:

0xD1

Table 9.1. Reference Electrical Characteristics

VDD = 3.0V, AV+ = 3.0V, -40°C to +85°C unless otherwise specified.

PARAMETER

CONDITIONS

INTERNAL REFERENCE (REFBE = 1)

Output Voltage

25°C ambient

VREF Short Circuit Current

VREF Power Supply

Current (supplied by AV+)

VREF Temperature

Coefficient

Load Regulation

Load = (0-to-200µA) to AGND (Note 1)

VREF Turn-on Time1

4.7µF tantalum, 0.1µF ceramic bypass

VREF Turn-on Time2

0.1µF ceramic bypass

VREF Turn-on Time3

no bypass cap

EXTERNAL REFERENCE (REFBE = 0)

Input Voltage Range

MIN

2.34

1.00

TYP

2.43

50

15

0.5

2

20

10

Input Current

0

MAX

2.50

30

(AV+)

– 0.3V

1

UNITS

V

mA

µA

ppm/°C

ppm/µA

ms

µs

µs

V

µA

Note 1: The reference can only source current. When driving an external load, it is recommended to add a load

resistor to AGND.

61

Rev. 1.7

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