MCP6S92 datasheet(17/40 Pages) MICROCHIP

17 / 40 page

 2004 Microchip Technology Inc.

DS21908A-page 17

MCP6S91/2/3

3.0

PIN DESCRIPTIONS

Descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Analog Output

The output pin (VOUT) is a low-impedance voltage

source. The selected gain (G), selected input (CH0,

CH1) and voltage at VREF determine its value.

3.2

Analog Inputs (CH0, CH1)

The inputs CH0 and CH1 connect to the signal

sources. They are high-impedance CMOS inputs with

low bias currents. The internal MUX selects which one

is amplified to the output.

3.3

External Reference Voltage (VREF)

The VREF pin, which is an analog input, should be at a

voltage between VSS and VDD (the MCP6S92 has

VREF tied internally to VSS). The voltage at this pin

shifts the output voltage.

3.4

Power Supply (VSS and VDD)

The Positive Power Supply Pin (VDD) is 2.5V to 5.5V

higher than the Negative Power Supply Pin (VSS). For

normal operation, the other pins are at voltages

between VSS and VDD.

Typically, these parts are used in a single (positive)

supply configuration. In this case, VSS is connected to

ground and VDD is connected to the supply. VDD will

need a local bypass capacitor (typically 0.01 µF to

0.1 µF) within 2 mm of the VDD pin. These parts can

share a bulk capacitor with analog parts (typically

2.2 µF to 10 µF) within 100 mm of the VDD pin.

3.5

Digital Inputs

The SPI interface inputs are: Chip Select (CS), Serial

Input (SI) and Serial Clock (SCK). These are Schmitt-

triggered, CMOS logic inputs.

3.6

Digital Output

The MCP6S93 device has a SPI interface Serial Output

(SO) pin. This is a CMOS push-pull output and does

not ever go High-Z. Once the device is deselected (CS

goes high), SO is forced low. This feature supports

daisy-chaining, as explained in Section 5.3 “Daisy-

Chain Configuration”.

MCP6S91

MCP6S92

MCP6S93

Symbol

Description

VOUT

Analog Output

CH0

Analog Input

—

CH1

Analog Input

3—4

VREF

External Reference Pin

VSS

Negative Power Supply

SPI™ Chip Select

SPI Serial Data Input

—

SPI Serial Data Output

SCK

SPI Clock Input

VDD

Positive Power Supply

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