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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP47FVB02 датащи(PDF) 35 Page - Microchip Technology |
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MCP47FVB02 датащи(HTML) 35 Page - Microchip Technology |
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35 / 92 page  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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