DS1846 Ver la hoja de datos (PDF) - Maxim Integrated

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componentes Descripción

Fabricante

DS1846

NV Tri-Potentiometer, Memory, and MicroMonitor

Maxim Integrated 

DS1846

The EEPROM memory allows a user to store configuration or calibration data for a specific system or

device and provides control of the potentiometer wiper settings. Any type of user information can reside

in the first 248 bytes (00h to F7h) of this memory. The next three bytes of memory (F8h to FAh) are for

potentiometer settings and the last five addresses of EEPROM memory (FBh to FFh) are reserved. These

reserved and potentiometer registers should not be used for data storage. Access to this EEPROM is

through an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The wiper

positions of the DS1846, as well as EEPROM data, can be hardware write-protected using the WP input

pin.

The MicroMonitor is a precision temperature-compensated reference and comparator that monitors

certain vital status conditions for a microprocessor. When a sense input detects an out-of-tolerance (VCC)

condition, a nonmaskable interrupt is generated. As the voltage at the device degrades, an internal power-

fail signal is generated that can be used to reset the processor. When VCC returns to an in-tolerance level,

the reset signal is kept in the active state for a minimum time of tRST to allow for the stabilization of the

power supply and the microprocessor. The MicroMonitor also functions as a pushbutton reset control.

The pushbutton input is debounced internally and generates an active pulse width of tRST minimum.

DS1846 BLOCK DIAGRAM Figure 1

SCL

SDA

WP

A0

2-Wire

Interface

Data

DS1846

EEPROM

5 Reserved

Bytes

FBh-FFh

Potentiometer 2

FAh

Potentiometer 0

F9h

Potentiometer 1

F8h

Nonvolatile

Digital Potentiometer

VCC

RPBR

User EPROM

248 Bytes

00h-F7h

MicroMonitor

PBRST

VCC

VCCTP

Timer

Delay

Potentiometer 2

10kW

H2

Addr FAh

W2

100-Positions

L2

Potentiometer 0

10kW

H0

Addr F9h

W0

100-Positions

L0

Potentiometer 1

100kW

H1

Addr F8h

W1

256-Positions

L1

RST

RST

VCC

IN

VTP

Timer

Delay

2.4kW

typical

NMI

2 of 18

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