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MCP47FVB11 bảng dữ liệu(PDF) 35 Page - Microchip Technology

tên linh kiện MCP47FVB11
Giải thích chi tiết về linh kiện  8-/10-/12-Bit Single/Dual Voltage Output Nonvolatile Digital-to-Analog Converters with SPI Interface
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MCP47FVB11 bảng dữ liệu(HTML) 35 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS20005429B-page 35
MCP48FEBXX
Register 4-2 shows the format of the Voltage
Reference Control Register. Each DAC has two bits to
control the source of the voltage reference of the DAC.
This register is for both the volatile memory locations
and the nonvolatile memory locations.
REGISTER 4-2:
VOLTAGE REFERENCE (VREF) CONTROL REGISTER (VOLATILE
AND NONVOLATILE) (ADDRESSES 08h AND 18h)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0 R/W-0 R/W-0 R/W-0
Single
—
—
—
—
—
—
—
—
—
—
—
—
—(1)
—(1) VR0B VR0A
Dual
—
—
—
—
—
—
—
—
—
—
—
—
VR1B VR1A VR0B VR0A
bit 15
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
= Single-channel device
= Dual-channel device
Single
Dual
bit 15-2
bit 15-4
Unimplemented:
Read as ‘0’
bit 1-0
bit 3-0
VRxB-VRxA:
DAC Voltage Reference Control bits
11
=VREF pin (Buffered); VREF buffer enabled
10
=VREF pin (Unbuffered); VREF buffer disabled
01
= Internal Band Gap (1.22V typical); VREF buffer enabled
VREF voltage driven when powered-down
00
=VDD (Unbuffered); VREF buffer disabled.
Use this state with Power-Down bits for lowest current.
Note 1:
Unimplemented bit, read as ‘0’.



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