MCP48FVB08 datasheet(59/112 Pages) MICROCHIP

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 2020 Microchip Technology Inc.

DS20006362A-page 59

MCP48FXBX4/8

Reference Control register. Each DAC has two bits to

control the source of the DAC’s voltage reference. This

locations.

VREF: VOLTAGE REFERENCE CONTROL REGISTER

(ADDRESSES 08h AND 18h; VOLATILE/NONVOLATILE)

R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n R/W-n

Octal

VR7B VR7A VR6B VR6A VR5B VR5A VR4B VR4A VR3B VR3A VR2B VR2A VR1B VR1A VR0B VR0A

Quad

—(1)

—(1) VR3B VR3A VR2B VR2A 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

= Quad-channel device

= Octal-channel device

Octal

Quad

—

bit 15-8

Unimplemented: Read as ‘0’

bit 15-0

bit 7-0

VRnB:VRnA: DAC Voltage Reference Control

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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