Internal Power Rails

The MAXQ2000 EV kit board generates three internal

power rails from the DC input power supply (from J1 or

the serial-to-JTAG board). Each of these supplies may

be used to support up to 100mA of additional circuitry

in the prototyping area. (Note: Test point TP1 is board

ground.)

• The adjustable power supply, which can be mea-

sured at test point TP2, provides an adjustable volt-

age between +1.8V and +3.6V. The level of this

supply can be adjusted manually by turning poten-

tiometer R2 with a screwdriver.

• The 3.6V fixed power supply can be measured at

test point TP3. This voltage level can be used for

• The 2.5V fixed power supply can be measured at

test point TP4. This voltage level can be used for

Table 1 shows how the jumpers connect the MAXQ2000

power rails to the on-board power supplies.

Using the LCD Display

To use the LCD daughterboard, it should be installed on

the J3 connector of the MAXQ2000 EV kit board. Pin 1

on J3 should line up with pin 1 of the LCD daughter-

board J1 connector. Note that when the LCD daughter-

board is installed correctly, it hangs off the top edge of

the MAXQ2000 EV kit board. When the LCD display is in

The LCD display on the LCD daughterboard is a static,

4-1/2 digit display. Figure 4 shows how the segments

are mapped. If the LCD display is not needed, it can be

removed to free up port pins P0.0–P0.7, P1.0–P1.7,

P2.0–P2.7, and P3.0–P3.7 for other uses.

Additional Hardware Features

Most of the additional hardware on the MAXQ2000 EV

kit board, such as the serial port, the MAX1407, and the

1-Wire interface, can be enabled or disabled by setting

jumpers or DIP switches. Disabling unused hardware

frees up the associated port pins for other uses.

MAXQ2000 Evaluation Kit

4

_____________________________________________________________________

JUMPER

SETTING

EFFECT

JU1

(No jumper)

JU1

Pins 1 and 2 connected

JU1

Pins 2 and 3 connected

JU2

(No jumper)

JU2

Pins 1 and 2 connected

JU2

Pins 2 and 3 connected

JU3

(No jumper)

JU3

Pins 1 and 2 connected

JU3

Pins 2 and 3 connected

*

Refer to the MAXQ2000 data sheet for the allowable range of the VDD supply.

Table 1. Power-Supply Jumper Settings