MAXQ2010-RFX+ datasheet(16/34 Pages) MAXIM

16 / 34 page

16-Bit Mixed-Signal Microcontroller

with LCD Interface

______________________________________________________________________________________

Pin Description

NAME

FUNCTION

POWER PINS

40, 63, 96

DVDD

Digital Supply Voltage

41, 66, 95

DGND

Digital Ground

98, 99

REGOUT

Regulator Capacitor. These pins must be shorted together at the pins and then connected to

ground through a 1.0μF ceramic capacitor.

AVDD

Analog Supply Voltage

AGND

Analog Ground

ANALOG MEASUREMENT PINS

AVREF

Analog Voltage Reference. When using an external reference source, this pin must be

connected to 1μF and 0.01μF filter capacitors in parallel. When using an internal reference

source, this pin must be connected to a 0.01μF capacitor.

78, 77

AN0, AN1

Analog Input 0:1. This pair of analog inputs can function as two single-ended inputs or one

differential pair. When functioning in differential mode, AN0 is the positive input and AN1 is

the negative input.

76, 75

AN2, AN3

Analog Input 2:3. This pair of analog inputs can function as two single-ended inputs or one

differential pair. When functioning in differential mode, AN2 is the positive input and AN3 is

the negative input.

74, 73

AN4, AN5

Analog Input 4:5. This pair of analog inputs can function as two single-ended inputs or one

differential pair. When functioning in differential mode, AN4 is the positive input and AN5 is

the negative input.

72, 71

AN6, AN7

Analog Input 6:7. This pair of analog inputs can function as two single-ended inputs or one

differential pair. When functioning in differential mode, AN6 is the positive input and AN7 is

the negative input.

RESET PIN

RST

Digital, Active-Low, Reset Input/Output. The CPU is held in reset when this pin 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 4mA.

This pin is driven low as an output when an internal reset condition occurs.

CLOCK PINS

32KIN

32KOUT

32kHz Crystal Input/Output. Connect an external 6pF, 32kHz watch crystal between 32KIN

and 32KOUT to generate the system clock. Alternatively, 32KIN is the input for an external

clock source when 32KOUT is disconnected.

HFXIN

HFXOUT

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 disconnected.

LCD PINS

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.

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