Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

8

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Detailed Description

MON1, MON2, MON3, and temperature analog signals.

After each signal conversion, a corresponding bit is set

that can be monitored to verify that a conversion has

occurred. The signals also have alarm and warning flags

that notify the user when the signals go above or below

the user-defined value. Interrupts can also be set for

each signal.

The position values of each resistor can be indepen-

dently programmed. The user can assign a unique

value to each resistor for every 2°C increment over the

-40°C to +102°C range.

Two buffers are provided to convert logic-level inputs

into open-drain outputs. Typically, these buffers are

used to implement transmit (Tx) fault and loss-of-signal

(LOS) functionality. Additionally, OUT1 can be asserted

in the event that one or more of the monitored values

go beyond user-defined limits.

PIN

BALL

NAME

FUNCTION

1

B2

SDA

2-Wire Serial Data I/O Pin. Transfers serial data to and from the device.

2

A2

SCL

2-Wire Serial Clock Input. Clocks data into and out of the device.

3

C3

OUT1

Open-Drain Buffer Output

4

A1

IN1

TTL/CMOS-Compatible Input to Buffer

5

B1

OUT2

Open-Drain Buffer Output

6

C2

IN2

TTL/CMOS-Compatible Input to Buffer

7

C1

WPEN

Write Protect Enable. The device is not write protected if WPEN is connected to ground. This pin has

8

D1

GND

Ground

9

D3

MON1

External Analog Input

10

D4

MON2

External Analog Input

11

C4

MON3

External Analog Input

12

D2

L0

Low-End Resistor 0 Terminal. It is not required that the low-end terminals be connected to a potential

less than the high-end terminals of the corresponding resistor. Voltage applied to any of the resistor

13

B3

H0

High-End Resistor 0 Terminal. It is not required that the high-end terminals be connected to a

potential greater than the low-end terminals of the corresponding resistor. Voltage applied to any of

14

B4

L1

Low-End Resistor 1 Terminal

15

A4

H1

High-End Resistor 1 Terminal

16

A3

Supply Voltage

Pin Description