MCP48CMB21 datasheet(49/106 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS20006160A-page 49

MCP48CXBXX

Reference Control register. Each DAC has two bits to

control the source of the voltage reference of the DAC.

This register is for the volatile memory locations. The

width of this register is 2 times the number of DACs for

the device.

VOLTAGE REFERENCE (VREF) CONTROL REGISTERS (08h/18h)

(VOLATILE/NONVOLATILE)

U-0

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

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(2) (1.214V 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’.

When the Internal Band Gap is selected, the band gap voltage source will continue to output the voltage

on the VREF pin in any of the Power-Down modes. To reduce the power consumption to its lowest level

(Band Gap disabled), after selecting the desired Power-Down mode, the voltage reference should be

changed to VDD or VREF pin unbuffered (“00” or ‘10’), which turns off the Internal Band Gap circuitry. After

wake-up, the user needs to reselect the Internal Band Gap (“01”) for the voltage reference source.

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