MAXQ2000 datasheet(7/39 Pages) MAXIM

7 / 39 page

Low-Power LCD Microcontroller

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DIGITAL SUPPLY CURRENT

vs. CLOCK FREQUENCY

fHFIN (MHz)

015

VDD = 2.75V

TA = +25°C

TA = -40°C

TA = 0°C

TA = +85°C

Typical Operating Characteristics

Pin Description

TQFN

QFN

NAME

FUNCTION

VDD

Digital Supply Voltage

VDDIO

I/O Supply Voltage

23, 35

28, 42

GND

Ground

VLCD

LCD Bias-Control Voltage. Highest LCD drive voltage used with static bias. Connected to an external

source.

VLCD1

LCD Bias, Voltage 1. LCD drive voltage used with 1/2 and 1/3 LCD bias. An internal resistor-

divider sets the voltage. External resistors and capacitors can be used to change the LCD voltage

or drive capability at this pin.

VLCD2

LCD Bias, Voltage 2. LCD drive voltage used with 1/3 LCD bias. An internal resistor-divider sets

the voltage. External resistors and capacitors can be used to change LCD voltage or drive

capability at this pin.

VADJ

LCD Adjustment Voltage. Connect to an external resistor to provide external control of the LCD

contrast. Leave disconnected for internal contrast adjustment.

RESET

Digital, Active-Low, Reset Input/Output. The CPU is held in reset when this is low and begins

executing from the reset vector when released. The pin includes pullup current source and should

be driven by an open-drain, external source capable of sinking in excess of 2mA. This pin is

driven low as an output when an internal reset condition occurs.

HFXIN

High-Frequency Crystal Input. Connect an external crystal or resonator between HFXIN and

HFXOUT as the high-frequency system clock. Alternatively, HFXIN is the input for an external,

high-frequency clock source when HFXOUT is floating.

HFXOUT

High-Frequency Crystal Output/Input. Connect an external crystal or resonator between HFXIN

and HFXOUT as the high-frequency system clock. Alternatively, float HFXOUT when an external,

high-frequency clock source is connected to the HFXIN pin.

MAXQ2000 Datasheet(PDF) 7 Page - Maxim Integrated Products

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