MCP47DA1 datasheet(27/76 Pages) MICROCHIP

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DS25118D-page 27

MCP47DA1

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

Additional descriptions of the device pins follow.

TABLE 3-1:

PINOUT DESCRIPTION FOR THE MCP47DA1

3.1

Positive Power Supply Input (VDD)

The VDD pin is the device’s positive power supply input.

The input power supply is relative to VSS and can range

from 1.8V to 5.5V. A decoupling capacitor on VDD

(to VSS) is recommended to achieve maximum

performance. Analog specifications are tested from

2.7V.

3.2

Ground (VSS)

The VSS pin is the device ground reference.

3.3

I2C Serial Clock (SCL)

The SCL pin is the serial clock pin of the I2C interface.

The MCP47DA1 acts only as a slave and the SCL pin

accepts only external serial clocks. The SCL pin is an

open-drain output. Refer to Section 5.0 “Serial

Interface – I2C Module” for more details of I2C Serial

Interface communication.

3.4

I2C Serial Data (SDA)

The SDA pin is the serial data pin of the I2C interface.

The SDA pin has a Schmitt Trigger input and an

open-drain output. Refer to Section 5.0 “Serial

Interface – I2C Module” for more details of I2C Serial

Interface communication.

3.5

Analog Output Voltage Pin (VOUT)

VOUT is the DAC analog output pin. The DAC output

has an output amplifier.

VOUT can swing from approximately VZS = 1/3 * VREF

to VFS = 2/3 * VREF. In Normal mode, the DC

impedance of the output pin is about 1

. See

Section 7.0 “Output Buffer” for more information.

3.6

Voltage Reference Pin (VREF)

This pin is the external voltage reference input. The

VREF pin signal is unbuffered so the reference voltage

must have the current capability not to drop its voltage

when connected to the internal resistor ladder circuit

(30 k

 typical). See Section 6.0 “Resistor Network”

for more information.

Name

Package

Type

Buffer

Type

Function

SOT-23-6

SC70-6

VDD

—

Positive Power Supply Input

VSS

—

Ground

SCL

I/O

ST (OD)

I2C™ Serial Clock pin

SDA

I/O

ST (OD)

I2C Serial Data pin

VOUT

I/O

Output voltage

VREF

I/O

Reference Voltage for VOUT output

Legend: A = Analog input

ST (OD) = Schmitt Trigger with Open Drain

I = Input

O = Output

I/O = Input/Output

P = Power

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