Dual, Temperature-Controlled Resistors with Inter-

nally Calibrated Monitors and Password Protection

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

1B2

SDA

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

2A2

SCL

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

3C3

OUT1

Open-Drain Buffer Output

4A1

IN1

TTL/CMOS-Compatible Input to Buffer

5B1

OUT2

Open-Drain Buffer Output

6C2

IN2

TTL/CMOS-Compatible Input to Buffer

7C1

N.C.

No Connection

8D1

GND

Ground

9D3

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