Rainbow-electronics DS1854 Bedienungsanleitung PDF herunterladen (Seite 7)

DS1854

Dual Temperature-Controlled Resistors with

Two Monitors

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Detailed Description

The user can read the registers that monitor the V

MON1, MON2, 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 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. Both resistors can also be put

in a high-impedance mode using the RHIZ pin.

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) alarms. Additionally, OUT1 can be asserted in

the event that one or more of the monitored values go

beyond user-defined limits.

BALL NAME

FUNCTION

1B2

SDA

2-Wire Serial Data I/O pin. This pin is for serial data transfer to and from the device.

2A2SCL 2-Wire Serial Clock Input. The serial clock input is used to clock data into and out of the device.

3C3

OUT1

Open-Drain Buffer Output

4A1IN1 TTL/CMOS-Compatible Input to Buffer

5B1

OUT2

Open-Drain Buffer Output

6C2IN2 TTL/CMOS-Compatible Input to Buffer

7C1

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.

8D1

GND

Ground

9D3

RHIZ

Resistor Disable Input. When high, this signal places both resistors in an off-state or high-impedance

mode. When low, the resistors are on. This pin has an internal pullup (R

RHIZ

10 D4

MON1

External Analog Input

11 C4

MON2

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 Descriptions

1 2 3 4 5 6 7 8 9 10 11 12 ... 21 22

Two Monitors 1

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