MCP3919A1-ESLASHSS datasheet(73/88 Pages) MICROCHIP

73 / 88 page

 2014 Microchip Technology Inc.

DS20005347A-page 73

MCP3919

9.7

CONFIG1 Register –

Configuration Register 1

Name

Bits

Address

Cof.

CONFIG1

0x0F

R/W

CONFIG1 REGISTER

U-0

R/W-0

—

RESET<2>

RESET<1>

RESET<0>

bit 23

bit 16

U-0

R/W-0

—

SHUTDOWN<2>

SHUTDOWN<1>

SHUTDOWN<0>

bit 15

bit 8

R/W-0

R/W-1

U-0

VREFEXT

CLKEXT

—

bit 7

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

bit 23-19

Unimplemented:

Read as 0

bit 18-16

RESET<2:0>:

Soft Reset mode setting for each individual ADC

RESET<n> = 1: Channel CHn in soft reset mode

RESET<n> = 0: Channel CHn not in soft reset mode

bit 15-11

Unimplemented:

Read as 0

bit 10-8

SHUTDOWN<2:0>:

Shutdown Mode setting for each individual ADC

SHUTDOWN<n> = 1: ADC Channel CHn in Shutdown

SHUTDOWN<n> = 0: ADC Channel CHn not in Shutdown

bit 7

VREFEXT:

Internal Voltage Reference selection bit

= Internal Voltage Reference Disabled. An external reference voltage needs to be applied across the

REFIN+/- pins. The analog power consumption (AIDD) is slightly diminished in this mode since the

internal voltage reference is placed into Shutdown mode.

= Internal Reference enabled. For optimal accuracy, the REFIN+/OUT pin needs proper decoupling

capacitors. REFIN- pin should be connected to AGND, when in this mode.

bit 6

CLKEXT:

Internal Clock selection bit

= MCLK is generated externally and should be provided on the OSC1 pin: the crystal oscillator is disabled

and consumes no current (Default)

= Crystal oscillator enabled. A crystal must be placed between OSC1 and OSC2 with proper decoupling

capacitors. The digital power consumption (DIDD) is increased in this mode due to the oscillator.

bit 5-0

Unimplemented:

Read as 0

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