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

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DS1846

NV Tri-Potentiometer, Memory, and MicroMonitor

Maxim Integrated 

PIN DESCRIPTIONS

DS1846

VCC—Power-Supply Terminal. The DS1846 will support supply voltages ranging from +4.5V to +5.5V.

GND—Ground Terminal

SDA—2-Wire Serial Data Interface. The serial data pin is for serial data transfer to and from the

DS1846. The pin is open drain and can be wire-ORed with other open-drain or open-collector interfaces.

SCL—2-Wire Serial Clock Interface. The serial clock input is used to clock data into the DS1846 on

rising edges and clock data out on falling edges.

WP—Write Protect. WP must be connected to GND before either the data in memory or potentiometer

wiper settings may be changed. WP is pulled high internally and must be either left open or connected to

VCC if write protection is desired.

A0—Address Input. This input pin specifies the address of the device when used in a multidropped

configuration. As many as two DS1846s may be addressed on a single 2-wire bus.

H0, H1, H2—High-End Terminals of the Potentiometers. For the three potentiometers, it is not

required that these terminals be connected to a potential greater than the low-end terminal of the

potentiometer. Voltage applied to the high end of the potentiometers cannot exceed the power-supply

voltage, VCC, or go below ground.

L0, L1, L2—Low-End Terminals of the Potentiometers. It is not required that these terminals be

connected to a potential less than the high-end terminals of the pot. Voltage applied to the low end of the

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

W0, W1, W2—Wipers of the Potentiometers. These pins are the wiper terminals of the potentiometers.

Three bytes in EEPROM memory locations F8h, F9h, and FAh determine each wiper’s setting. Voltage

applied to either wiper terminal cannot exceed the power-supply voltage, VCC, or go below ground.

PBRST —Pushbutton Reset. This input pin is active low. It acts as the pushbutton reset pin for the

MicroMonitor. Pushbutton reset is pulled high internally.

NMI —Nonmaskable Interrupt. Active-low signal that is generated to provide for an early power-fail

warning.

IN—NMI Voltage Input. An input voltage below VTP on this input forces the NMI output low. This can

be used with a voltage-divider to set a secondary voltage monitoring level. (See Figure 4.)

RST —Active-Low Reset Output. This signal provides an output that can be used to reset a

microprocessor.

RST—Active-High Reset Output. This signal provides an output that can be used to reset a

microprocessor.

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