Maxim Integrated │ 4

www.maximintegrated.com

Evaluates: MAX77818

MAX77818 EV System

Fuel Gauge Test Setup

1) Close MAX77818 EV kit GUI. Fuel gauge uses a separate GUI.

2) Open FG section software screen and see if FG reads proper OCV and SOC while charging.

3) Open FG section software screen and see if FG reads proper OCV and SOC while discharging.

Figure 3. Schematic Diagram

C2

2.2µF

16V

U1

CHGIN

CHGIN

CHGIN

CHGIN

C8

C9

D8

D9

BYP

BYP

BYP

BYP

BYP

B8

C7

D7

E8

E9

C9

10µF

16V

F8

F9

G8

G9

CHGLX

CHGLX

CHGLX

CHGLX

L1

0.47µH

C13

10uF

10V

VSYS

SYS

SYS

SYS

SYS

SYS

E5

F5

G5

H5

H6

DETBATB

BATT

BATTGND

BATT

BATT

BATT

BATT

G3

G4

H3

H4

DETBATB B6

R8

10K

BAT_SP G6

BAT_SN F6

CHGPG

CHGPG

CHGPG

GSUBCG

H7

H8

H9

G7

E1

F2

SYSA

SYSA

C14

10uF

10V

J7

Micro-B

USB

VBUS

GND

GND_Q

GND_D

GND_A

GND_A

GND_A

GND_A

GND_A

A6

E3

D1

D2

D3

D4

D5

VCCTEST

TEST4

B4

TEST3

B3

TEST2

A2

TEST1

B2

C4

2.2µF

10V

AVL

D6

C10

10µF

16V

C12

10uF

10V

B1

BST

F7

47K

470K

VIO

C8

10µF

10V

PVL

E7

C11

0.1µF

16V

VSYS

2.2K

2.2K

1.8V to 5.5V

200K

200K

200K

C5

1µF

10V

C6

1µF

10V

B9

B7

VIO

B5

SCL

A4

SDA

A3

INTB

C3

WCINOKB

A5

INOKB

C5

SAFEOUT1

SAFEOUT2

VBFG

C15

0.1uF

16V

THMB

THM

10K

1%

TEST5

TEST6

C1

C2

F1

G1

H2

SYS

C3

4.7µF

10V

WCIN

WCIN

A7

A8

WCIN

IN

IN

IN

OUT

OUT

OUT

OVLO

GND

GND

GND

ENB

VBUS_DET

U2 MAX14681

THM

VIO

1

3

5

7

9

11

13

15

17

19

2

4

6

8

10

12

14

16

18

20

ENB

VBUS_DET

INTB

WCINOKB

INOKB

SAFEOUT1

SAFEOUT2

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

A1

C6

C4

E2

E4

E6

F3

F4

G2

H1

VSYS

BYPS

C1

0.1µF

35V

R1

100K

1%

R2

10K

1%

R3

0

R13

R12

R17

R15

R16

R9

R10

R7

CON1

R11

N.C

CHGPG

GND

GND

C16

N.C.

SYSS

BATT

TP1

R4

NC

R14

0

SCL SDA

CHGIN

CHGPGS

CHGINS

WCINS

CHGLXS

JU1

VIO

R6 0Ω

NC

A9

R5 0Ω

C17

10nF