Silicon Laboratories C8051F340 Instrukcja Użytkownika Pobierz pdf (Strona 58)

C8051F340/1/2/3/4/5/6/7

58 Rev. 0.5

SFR Definition 6.1. REF0CN: Reference Control

Table 6.1. Voltage Reference Electrical Characteristics

= 3.0 V; –40 to +85 °C Unless Otherwise Specified

Parameter Conditions Min Typ Max Units

Internal Reference (REFBE = 1)

Output Voltage 25 °C ambient 2.38 2.44 2.50 V

VREF Short-Circuit Current 10 mA

VREF Temperature Coeffi-

cient

15 ppm/°C

Load Regulation Load = 0 to 200 µA to GND 1.5 ppm/µA

VREF Turn-on Time 1

4.7 µF tantalum, 0.1 µF ceramic

bypass

2 ms

VREF Turn-on Time 2 0.1 µF ceramic bypass 20 µs

VREF Turn-on Time 3 no bypass cap 10 µs

Power Supply Rejection 140 ppm/V

External Reference (REFBE = 0)

Input Voltage Range 0

Input Current

Sample Rate = 200 ksps; VREF =

3.0

12 µA

Bias Generators

ADC Bias Generator BIASE = ‘1’ 100 µA

Reference Bias Generator 40 µA

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

Bit3: REFSL: Voltage Reference Select.

This bit selects the source for the internal voltage reference.

0: VREF pin used as voltage reference.

1: V

used as voltage reference.

Bit2: TEMPE: Temperature Sensor Enable Bit.

0: Internal Temperature Sensor off.

1: Internal Temperature Sensor on.

Bit1: BIASE: Internal Analog Bias Generator Enable Bit.

0: Internal Bias Generator off.

1: Internal Bias Generator on.

Bit0: REFBE: Internal Reference Buffer Enable Bit.

0: Internal Reference Buffer disabled.

1: Internal Reference Buffer enabled. Internal voltage reference driven on the VREF pin.

R/W R/W R/W R/W R/W R/W R/W R/W Reset Value

- - - - REFSL TEMPE BIASE REFBE 00000000

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0xD1

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 281 282

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