Rainbow-electronics DS1859 Bedienungsanleitung PDF herunterladen (Seite 8)

DS1859

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

8 _____________________________________________________________________

Detailed Description

The user can read the registers that monitor the V

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

an internal pullup (R

WPEN

). See Table 6.

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

terminals cannot exceed the power-supply voltage, V

, or go below ground.

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

the resistor terminals cannot exceed the power-supply voltage, V

, or go below ground.

14 B4 L1 Low-End Resistor 1 Terminal

15 A4 H1 High-End Resistor 1 Terminal

16 A3 V

Supply Voltage

Pin Description

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

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