MAX8845Z Evaluation Kit

4

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MAX8845Z

EVALUATION KIT+

JU2

+

-

-

-+

SETI

MIN

DETBAT

ABI

BATT-

BATT+

(ABO)

ABO

POWER

SUPPLY (PS2)

+5V

+

DMM1

DMM2

-

+

DMM3

JU3

D2

D1

SHUNT INSTALLED = BATTERY PRESENT.

SHUNT NOT INSTALLED = BATTERY ABSENT.

SHUNT INSTALLED = IC DISABLED.

SHUNT NOT INSTALLED = IC ENABLED.

D2 IS ON WHEN POWER

SUPPLY IS VALID.

JU4

JU1

SHUNT INSTALLED = ABI CONNECTED TO VI/O.

SHUNT NOT INSTALLED = ABI UNCONNECTED.

( ) = MAX8845Y ONLY.

SHUNT INSTALLED = ABO - MAX8845Y ONLY.

SHUNT NOT INSTALLED = ABO - MAX8845Z ONLY.

D1 IS ON WHEN BATTERY CHARGING.

10A

AMMETER

Li+

-

POWER

SUPPLY (PS1)

+5V

+

Figure 1. Test Procedure Setup for MAX8845Z EV Kit

JUMPER

DEFAULT

SETTINGS

FUNCTION

JU1

Installed

JU1 connects

EN (active-low enable input) to VI/O (system supply). Install a shunt on JU1 to disable

the IC.

EN has an internal pulldown resistor to GND. Remove the shunt from JU1 to enable the IC.

JU2

Installed

JU2 connects DETBAT (battery pack ID resistor detection input) to GND through R5. Install a shunt

on JU2 to simulate battery present. Remove the shunt on JU2 to simulate battery absent.

JU3

Not installed

Remove the shunt on JU3 to evaluate the MAX8845Z with an active-high autobooting logic output

(ABO). Install a shunt on JU3 to connect

ABO to the VI/O supply through R8 in order to achieve a

logic-high output on the drain of the internal open-drain MOSFET (MAX8845Y only).

JU4

Not installed

JU4 connects ABI (autobooting input) to VI/O (system supply). Install a shunt on JU4 to connect ABI

to VI/O. Remove the shunt on JU4 to leave ABI unconnected and when ABI is driven by an external

source.

Table 1. Jumper Settings (JU1–JU4)