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MAX8814 Evaluation Kit
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
? 28V power supply (PS1) capable of 1A
? 5V power supply (PS2) capable of 100mA
8) Connect a digital multimeter (DMM2) from POK to
GND.
9) Connect a digital multimeter (DMM3) from ABO to
GND.
10) Connect a digital multimeter (DMM4) from ISET to
GND.
?
?
?
Four digital multimeters (DMM1–DMM4)
One 10A ammeter
A single-cell lithium-ion (Li+) battery (not fully
11) Turn on PS1 and then turn on PS2.
12) Remove the shunt on JU1 to put the EV kit in enable
mode.
charged)
Procedure
The MAX8814 EV kit is a fully assembled and tested
surface-mount PCB. Follow the steps below and see
Figure 1 to set up and verify board operation. Caution:
Do not turn on power supplies until all connections
are made.
1) Preset the power supply (PS1) to 5V. Turn off the
power supply. Do not turn on the power supply
until all connections are made.
2) Preset the power supply (PS2) to 5V. Turn off the
power supply. Do not turn on the power supply
until all connections are made.
3) Verify that a shunt is installed on JU1 ( EN ) to set the
EV kit in disable mode.
4) Connect the positive lead of the power supply
(PS1) to the EV kit pad labeled IN. Connect the
negative lead of the power supply to the EV kit pad
labeled GND.
5) Connect the positive lead of the power supply
(PS2) to the EV kit pad labeled VI/O. Connect the
negative lead of the power supply to the EV kit pad
labeled GND. Do not connect the PS2 positive lead
to ABI until instructed.
6) Observe correct Li+ cell polarity. Connect a single-
cell Li+ cell and 10A ammeter, as shown in Figure
1. The positive lead of the ammeter must connect to
BATT+ and the negative lead to the positive termi-
nal of the Li+ battery.
13) If the charger is in fast-charge mode, verify that the
ammeter reads approximately 570mA. If the charg-
er is in precharge mode, verify that the ammeter
reads 57mA.
14) If the charger is in fast-charge mode, verify that the
voltage read at DMM4 is 1.4V. If the charger is in
precharge mode, verify that the voltage read at
DMM4 is 0.14V.
15) Verify that the voltage read by DMM2 is 0V, indicat-
ing POK is low.
16) Verify that the voltage read by DMM3 is approxi-
mately the same voltage read by DMM1.
17) When the battery is fully charged, DMM1 reads 4.2V.
18) Turn off the input power supply (PS1).
19) Verify that the voltage read by DMM2 is near 5V
and the voltage read by DMM3 is 0V.
20) Connect ABI to the positive terminal of PS2.
21) Verify that the voltage read at DMM3 is approxi-
mately the same voltage read by DMM1.
When evaluation of the MAX8814 EV kit is completed,
use the following steps to power down the EV kit:
1) Install a shunt on JU1.
2) Turn off all power supplies.
3) Remove the battery.
4) Disconnect all test leads from the EV kit.
Table 1. Jumper Settings
7) Connect a digital multimeter (DMM1) across the
Li+ battery. Note the battery voltage. If the
V BATT < 2.5V, the charger starts in precharge
mode. If V BATT ≥ 2.5V, the charger starts up in fast-
charge mode.
JUMPER
JU1
FUNCTION
Shorts EN (active-low enable input) to VI/O
(system supply). Short JU1 to disable the IC. EN
has an internal pulldown resistor to GND. Leave
JU1 open to enable the IC.
2
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