4

Maxim Integrated

Evaluates: MAX8900A/MAX8900B

MAX8900A Evaluation Kit

Figure 3. Connection Diagram and Default Jumper Connections

Table 1. Jumper Functions

*Default position.

FAST-CHARGE RATE

BATTERY OR

SIMULATED

BATTERY

(FIGURE 2)

BAT

VOLTMETER

POWER

SUPPLY

BAT

GND

A*

A*

EV KIT

MAX8900A

*ADJUST THE AMMETERS TO THEIR

LARGEST CURRENT RANGE TO

MINIMIZE THEIR SERIES IMPEDANCE.

DO NOT ALLOW THE AMMETERS TO

OPERATE IN THEIR “AUTORANGE” MODE.

IF CURRENT READINGS ARE NOT

DESIRED, SHORT ACROSS THE AMMETERS.

FC0

JU51

0

FC1

ADJJU10

FC2

JU4

100mA

50mA

ADJ

DONE/PREQUAL

THRESHOLD

10mA

ADJ

THERMISTOR

JU11

ROOM

NTC

1 2 3

JU2

CEN

IN

GND

3

2

1

JU1

JUMPER

NODE OR FUNCTION

POSITION

FUNCTION

JU1

IN input selector

Open

Only the “IN” pad is connected to the MAX8900A’s power input (IN).

1-2

Both the “IN” pad and J3 are connected to IN.

2-3*

Both the “IN” pad and J1 are connected to IN.

JU2

CEN

1-2

Charger is disabled (logic-high).

2-3*

Charger is enabled (logic-low).

JU3

STAT1 output

1-2*

D1 LED indicator is connected to STAT1.

Open

D1 LED indicator is not connected to STAT1.

JU4

DONE/PREQUAL

THRESHOLD adjustment

1-2

Adjustable setting. R23 (50kI potentiometer) and R27 are

connected to DNI.

3-4

10mA setting. R18 (35.7kI) is connected to DNI.

5-6*

50mA setting. R19 (7.68kI) is connected to DNI.

7-8

100mA setting. R20 (3.83kI) is connected to DNI.

JU5

FAST-CHARGE RATE

adjustment

1-2*

Gate of M1 driven high. R10 (35.7kI) is connected to SETI, which

increases the fast-charge current setting by 95mA.

2-3

Gate of M1 driven low. R10 is disconnected from SETI.

4-5

Gate of M2 driven high. R11 (9.09kI) is connected to SETI, which

increases the fast-charge current setting by 375mA.

5-6*

Gate of M2 driven low. R11 is disconnected from SETI.

7-8

Gate of M3 driven high. R12 (4.75kI) is connected to SETI, which

increases the fast-charge current setting by 717mA.

8-9*

Gate of M3 driven low. R12 is disconnected from SETI.