MCP4432 datasheet(40/94 Pages) MICROCHIP

40 / 94 page

MCP443X/5X

DS22267A-page 40

 2010 Microchip Technology Inc.

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 A1 pin completes

the device address. This allows up to 4 MCP44XX

devices to be on a single I2C bus.

During normal operation, the voltage on this pin

determines whether 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 MCP44XX is a slave device, so its 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

potentiometer. 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.

MCP44XX devices have four terminal B pins, one for

each resistor network.

3.6

Potentiometer Wiper (W) Terminal

The terminal W pin is connected to the internal

potentiometer’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.

MCP44XX devices have four terminal W pins, one for

each resistor network.

3.7

Potentiometer Terminal A

The terminal A pin is available on the MCP44X1

devices,

and

connected

the

internal

potentiometer’s terminal A.

The potentiometer’s terminal A is the fixed connection

to the Full Scale wiper value of the digital

potentiometer. 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 MCP44X2

devices, and the internally terminal A signal is floating.

MCP44X1 devices have four terminal A pins, one for

each resistor network. Terminal A is not available on

the MCP44X2 devices.

3.8

Not Connected (NC)

The NC pin is not used.

3.9

Reset (RESET)

The RESET pin is used to force the device into the

POR/BOR state.

3.10

Address 1 (A1)

The A1 pin is the I2C interface’s Address 1 pin. Along

with the A0 pins, up to 4 MCP44XX 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

substrate. 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

connected to a PCB heat sink.

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