MAXQ2000-RFX+ 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-EP

QFN-EP

LQFP

NAME

FUNCTION

VDD

Digital Supply Voltage

36, 62

VDDIO

I/O Supply Voltage

23, 35

28, 42

39, 63

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.

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