參數(shù)資料
型號: C8051F015-TB
廠商: Silicon Laboratories Inc
文件頁數(shù): 130/171頁
文件大?。?/td> 0K
描述: BOARD PROTOTYPING W/C8051F015
標準包裝: 1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
Figure 9.2. REF0CN: Reference Control Register
R/W
Reset Value
-
TEMPE
BIASE
REFBE
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xD1
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.
Table 9.1. Reference Electrical Characteristics
VDD = 3.0V, AV+ = 3.0V, -40
C to +85C unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTERNAL REFERENCE (REFBE = 1)
Output Voltage
25
C ambient
2.34
2.43
2.50
V
VREF Short Circuit Current
30
mA
VREF Power Supply
Current (supplied by AV+)
50
A
VREF Temperature
Coefficient
15
ppm/
C
Load Regulation
Load = (0-to-200
A) to AGND (Note 1)
0.5
ppm/
A
VREF Turn-on Time1
4.7
F tantalum, 0.1F ceramic bypass
2
ms
VREF Turn-on Time2
0.1
F ceramic bypass
20
s
VREF Turn-on Time3
no bypass cap
10
s
EXTERNAL REFERENCE (REFBE = 0)
Input Voltage Range
1.00
(AV+)
– 0.3V
V
Input Current
0
1
A
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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