MCP19124 datasheet(49/236 Pages) MICROCHIP

49 / 236 page

 2016 Microchip Technology Inc.

DS20005619A-page 49

MCP19124/5

6.10

VREF2 Voltage Reference

The VREF2CON register controls a second reference

DAC that can be used externally. For example, it can be

sent off chip and used to set the current regulation set

point for a MCP1631 Pulse-Width Modulator. The

MCP19124/5 must be configured in Master Mode with

bits MSC<0:1> = 01 in the MODECON register to

connect VREF2 to GPB1. In Stand-Alone mode, VREF2

is not accessible. VREFCON2 holds the digital value

used to set the VREF2 DAC. Since this reference is

intended to go off chip, there is no pedestal offset

associated with it and it is referenced to GND. It is an

8-bit linear DAC and has a range from 0V to 1.23V (BG)

equating to 255 steps at 4.8 mV/step.

6.11

Analog Peripheral Control

The MCP19124/5 have various analog peripherals.

These peripherals can be configured to allow

customizable operation. Refer to Register 6-13 for

more information.

6.11.1

MOSFET GATE DRIVER ENABLES

The MCP19124/5 can enable and/or disable the

MOSFET gate driver outputs for the primary drive

(PDRV)

and

the

secondary

drive

(SDRV)

independently. Setting the PDRVEN bit in the PE1

SDRVEN bit in the PE1 register enables the secondary

drive. Refer to Register 6-13 for details.

VREF2CON: VREF2 VOLTAGE SET POINT REGISTER

R/W-0

VREF2<7:0>

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n = Value at POR

‘1’

= Bit is set

‘0’

= Bit is cleared

bit 7-0

VREF2<7:0>: Voltage Controlling Current Regulation Set Point bits

VREF2(V) = VBG x N/255 where N = the decimal value written to the VREF2CON Register

VREF2<7:0> from 0 to 255.

PE1: ANALOG PERIPHERAL ENABLE1 CONTROL REGISTER

R/W-0

U-0

R/W-0

PDRVEN

SDRVEN

PDRVBY

SDRVBY

—

ISPUEN

PWMSTR_PEN PWMSTR_SEN

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n = Value at POR

‘1’

= Bit is set

‘0’

= Bit is cleared

bit 7

PDRVEN: PDRV Gate Drive Enable bit

= PDRV gate drive is enabled

= PDRV gate drive is disabled

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