DS1854 データシートの表示（PDF） - Maxim Integrated

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DS1854

Dual Temperature-Controlled Resistors with Two Monitors

Maxim Integrated 

Dual Temperature-Controlled Resistors with

Two Monitors

Pin Descriptions

PIN BALL NAME

FUNCTION

1

B2

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

2

A2

SCL 2-Wire Serial Clock Input. The serial clock input is used to clock 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 (RWPEN). See Table 6.

8

D1

GND Ground

9

D3

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 (RRHIZ).

10

D4 MON1 External Analog Input

11

C4 MON2 External Analog Input

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

12

D2

L0 less than the high-end terminals of the corresponding resistor. Voltage applied to any of the resistor

terminals cannot exceed the power-supply voltage, VCC, or go below ground.

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

13

B3

H0 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, VCC, or go below ground.

14

B4

L1 Low-End Resistor 1 Terminal

15

A4

H1 High-End Resistor 1 Terminal

16

A3

VCC Supply Voltage

Detailed Description

The user can read the registers that monitor the VCC,

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.

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