MCP4641-103ESLASHMF datasheet(36/92 Pages) MICROCHIP

36 / 92 page

MCP454X/456X/464X/466X

DS22107A-page 36

3.1

High Voltage Command / Address 0

(HVC/A0)

The HVC/A0 pin is the Address 0 input for the I2C

interface as well as the High Voltage Command pin. At

the device’s POR/BOR the value of the A0 address bit

is latched. This input along with the A2 and A1 pins

completes the device address. This allows up to 8

MCP45xx/46xx devices can be on a single I2C bus.

During normal operation the the voltage on this pin

determines if the I2C command is a normal command

or a High Voltage command (when HVC/A0 = VIHH).

3.2

Serial Clock (SCL)

The SCL pin is the serial interfaces Serial Clock pin.

This pin is connected to the Host Controllers SCL pin.

The MCP45XX/46XX is a slave device, so it’s SCL pin

accepts only external clock signals.

3.3

Serial Data (SDA)

The SDA pin is the serial interfaces Serial Data pin.

This pin is connected to the Host Controllers SDA pin.

The SDA pin is an open-drain N-channel driver.

3.4

Ground (VSS)

The VSS pin is the device ground reference.

3.5

Potentiometer Terminal B

The terminal B pin is connected to the internal

potentiometer’s terminal B.

The potentiometer’s terminal B is the fixed connection

to the Zero Scale wiper value of the digital potentiome-

ter. This corresponds to a wiper value of 0x00 for both

7-bit and 8-bit devices.

The terminal B pin does not have a polarity relative to

the terminal W or A pins. The terminal B pin can

support both positive and negative current. The voltage

on terminal B must be between VSS and VDD.

MCP46XX devices have two terminal B pins, one for

each resistor network.

3.6

Potentiometer Wiper (W) Terminal

The terminal W pin is connected to the internal potenti-

ometer’s terminal W (the wiper). The wiper terminal is

the adjustable terminal of the digital potentiometer. The

terminal W pin does not have a polarity relative to

terminals A or B pins. The terminal W pin can support

both positive and negative current. The voltage on

terminal W must be between VSS and VDD.

MCP46XX devices have two terminal W pins, one for

each resistor network.

3.7

Potentiometer Terminal A

The terminal A pin is available on the MCP4XX1

devices, and is connected to the internal potentiome-

ter’s terminal A.

The potentiometer’s terminal A is the fixed connection

to the Full-Scale wiper value of the digital potentiome-

ter. This corresponds to a wiper value of 0x100 for 8-bit

devices or 0x80 for 7-bit devices.

The terminal A pin does not have a polarity relative to

the terminal W or B pins. The terminal A pin can

support both positive and negative current. The voltage

on terminal A must be between VSS and VDD.

The terminal A pin is not available on the MCP4XX2

devices, and the internally terminal A signal is floating.

MCP46X1 devices have two terminal A pins, one for

each resistor network.

3.8

Write Protect (WP)

The WP pin is used to force the non-volatile memory to

be write protected.

3.9

Address 2 (A2)

The A2 pin is the I2C interface’s Address 2 pin. Along

with the A1 and A0 pins, up to 8 MCP45XX/46XX

devices can be on a single I2C bus.

3.10

Address 1 (A1)

The A2 pin is the I2C interface’s Address 1 pin. Along

with the A2 and A0 pins, up to 8 MCP45XX/46XX

devices can be on a single I2C bus.

3.11

Positive Power Supply Input (VDD)

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

The input power supply is relative to VSS.

While the device VDD < Vmin (2.7V), the electrical

performance of the device may not meet the data sheet

specifications.

3.12

No Connect (NC)

These pins should be either connected to VDD or VSS.

3.13

Exposed Pad (EP)

This pad is conductively connected to the device’s sub-

strate. This pad should be tied to the same potential as

the VSS pin (or left unconnected). This pad could be

used to assist as a heat sink for the device when con-

nected to a PCB heat sink.

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