2

FN8214.1

October 25, 2005

BLOCK DIAGRAM

PIN ASSIGNMENTS

SDA

SCL

WP

2-Wire

I2

VRef

R2

VSense

Interface

A2, A1, A0

DAC 2

ADC

Look-up

Table 1

Look-up

Table 2

Control

& Status

Mux

Mux

I1

R1

DAC 1

Mux

Mux

Voltage

Reference

TSSOP

Pin

Pin

Name

Pin Description

1A0

Device Address Select Pin 0. This pin determines the LSB of the device address required to com-

municate using the 2-wire interface. The A0 pin has an on-chip pull-down resistor.

2A1

Device Address Select Pin 1. This pin determines the intermediate bit of the device address re-

quired to communicate using the 2-wire interface. The A1 pin has an on-chip pull-down resistor.

3A2

Device Address Select Pin 2. This pin determines the MSB of the device address required to com-

municate using the 2-wire interface. The A2 pin has an on-chip pull-down resistor.

4Vcc

Supply Voltage.

5WP

Write Protect Control Pin. This pin is a CMOS compatible input. When LOW, Write Protection is

enabled preventing any “Write” operation. When HIGH, various areas of the memory can be protect-

ed using the Block Lock bits BL1 and BL0. The WP pin has an on-chip pull-down resistor, which en-

ables the Write Protection when this pin is left floating.

6SCL

Serial Clock. This is a TTL compatible input pin. This input is the 2-wire interface clock controlling data

input and output at the SDA pin.

7SDA

Serial Data. This pin is the 2-wire interface data into or out of the device. It is TTL compatible when

used as an input, and it is Open Drain when used as an output. This pin requires an external pull up

resistor.

8I1

Current Generator 1 Output. This pin sinks or sources current. The magnitude and direction of the

current is fully programmable and adaptive. The resolution is 8 bits.

9R1

Current Programming Resistor 1. A resistor between this pin and Vss can set the maximum output

current available at pin I1. If no resistor is used, the maximum current must be selected using control

register bits.

10

R2

Current Programming Resistor 2. A resistor between this pin and Vss can set the maximum output

current available at pin I2. If no resistor is used, the maximum current must be selected using control

register bits.

11

Vss

Ground.

12

VSense

Sensor Voltage Input. This voltage input may be used to drive the input of the on-chip A/D converter.

13

VRef

Reference Voltage Input or Output. This pin can be configured as either an Input or an Output. As

an Input, the voltage at this pin is provided by an external source. As an Output, the voltage at this

pin is a buffered output voltage of the on-chip bandgap reference circuit. In both cases, the voltage

at this pin is the reference for the A/D converter and the two D/A converters.

14

I2

Current Generator 2 Output. This pin sinks or sources current. The magnitude and direction of the

current is fully programmable and adaptive. The resolution is 8 bits.

X96010