6

FN8115.0

April 11, 2005

X40237 PIN ASSIGNMENT

SOIC

Name

Function

1

Connection to end of resistor array for (the 256 Tap) DCP2.

2

Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP2.

3V3MON

V3MON Voltage Monitor Input.

V3MON is the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than

not used.

4V3FAIL

V3MON RESET Output.

LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires

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

5MR

Manual Reset. MR is a TTL level compatible input.

time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an

external “pull-down” resistor.

6WP

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 device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), 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.

7SCL

Serial Clock.

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

8SDA

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 resistor.

9

VSS

Ground.

10

NC

No Connect

11

Connection to end of resistor array for (the 64 Tap) DCP0.

12

Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP0.

13

V2MON

V2MON Voltage Monitor Input.

V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than

not used.

14

V2FAIL

V2MON RESET Output.

The V2FAIL pin requires the use of an external “pull-up” resistor.

15

RESET

The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active

(HIGH) using the manual reset (MR) input pin.

16

Supply Voltage.

X40231, X40233, X40235, X40237, X40239