3

FN8208.1

January 3, 2006

PIN ASSIGNMENT

Pin

Name

Function

1

Connection to end of resistor array for (the 256 Tap) DCP 2.

2

Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP 2.

3

Connection to other end of resistor array for (the 256 Tap) DCP 2.

4V3

V3 Voltage Monitor Input. V3 is the input to a non-inverting voltage comparator circuit. When the V3

input is higher than the

5V3RO

V3 RESET Output. This open drain output makes a transition to a HIGH level when V3 is greater than

pin requires the use of an external “pull-up” resistor.

7WP

Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is

enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write

Protection is enabled, and the DCP Write Lock feature is active (i.e. the DCP Write Lock bit is set to

“1”), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the

wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an

internal “pull-down” resistor, thus if left floating the write protection feature is disabled.

8SCL

Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input

and output.

9SDA

Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the

device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up re-

sistor.

10

Vss

Ground.

11

Connection to other end of resistor for (the 100 Tap) DCP 1.

12

Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP 1.

13

Connection to end of resistor array for (the 100 Tap) DCP 1.

14

Connection to end of resistor array for (the 64 Tap) Digitally Controlled Potentiometer (DCP) 0.

15

Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP 0.

16

Connection to the other end of resistor array for (the 64 Tap) DCP 0.

17

V2

V2 Voltage Monitor Input. V2 is the input to a non-inverting voltage comparator circuit. When the V2

input is greater than the

18

V2RO

V2 RESET Output. This open drain output makes a transition to a HIGH level when V2 is greater than

pin. The V2RO pin requires the use of an external “pull-up” resistor.

20

Vcc / V1

Supply Voltage.

6, 19

NC

No Connect.

X9522