FSA557

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2

Table 1. PIN FUNCTION DESCRIPTION

Pin No. WLCSP12

Pin Name

Description

A1

L1

Low Supply Signal Path 1

A2

VDD

Power Supply or Select Signal from Host GPIO

A3

L2

Low Supply Signal Path 2

B1

COM1

Common Port 1

B2

NC

No Connect

B3

COM2

Common Port 2

C1

H1

High Supply Signal Path 1

C2

EN_N

Path enable (active low)

C3

H2

High Supply Signal Path 2

D1

C_EXT

Capacitor Reference (Floating disables slow gradual transition)

D2

GND

Ground

D3

SEL

Path Select (Grounding forces VDD to determine path selection)

Table 2. SWITCH TRUTH TABLE

VDD

EN_N

SEL

Switch State

Notes

Low or FLOAT

X

X

COMM1/2 = L1/2

Dead battery

High

LOW OR FLOAT

LOW OR FLOAT

COMM1/2 = H1/2

Good battery

X

LOW OR FLOAT

HIGH

COMM1/2 = L1/2

Low battery

HIGH

HIGH

X

Hi−Z

Both paths disabled

NOTE: Click and pop suppression active during any switch state transition that occurs with VDD at an active HIGH level

Table 3. APPLICATION CIRCUIT COMPONENTS

Component

Manufacturer

Part Number

Value

Case Size

Voltage Rating

40 nF