STLC4420A datasheet(9/40 Pages) STMICROELECTRONICS

Part #	STLC4420A

Description	Single chip 802.11b/g/a WLAN radio

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STLC4420A

Pin descriptions

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VI2C

D22

Digital supply

input

Digital 1.8V I/O power supply input pin

dedicated to the EMU I2C bus interface.

Connect to ground if the I2C interface of the

EMU is not connected (EMU_SCL,

EMU_SDA)

VIO

B20

Supply input

(1.8 V)

-

Host digital I/O supply input for SPI and

Bluetooth interfaces.

V1OUT

N15

Regulator output

-

Linear regulator 1.8V output.

V2OUT

M12

Regulator output

-

Linear regulator 1.8V output.

V2XOUT

B14

Regulator output

-

Linear regulator 1.2V output.

V4OUT

M16

Regulator output

-

Linear regulator output selectable for 2.81V

or 3.11V. Output voltage controlled by

V4_OUTSEL pin G24.

V4_OUTSEL

G24

1.8 V digital input

-

Control input for selection of V4OUT regulator

output voltage. Logic 0 = 0=2.81V, 1= 3.11V

FB_V2

M11

Regulator sense

-

Sense line for V2 regulator. Connect to

V2OUT pin M12 with a short trace.

FB_V2X

C14

Regulator sense

-

Sense line for V2X regulator. Connect to

V2XOUT pin B14 with a short trace.

EMU_CREF

J23

Analog reference

-

Reference capacitor for internal Power

Management Unit (PMU). Connect a 1uF

capacitor to a solid board gound plane.

IRES

J24

Analog reference

Reference resistor for the internal Power

Management Unit (EMU). Connect a 1M

Ω

resistor to a solid board ground plane.

VDDA

A1, A2, A3,

A8, A11, H2,

N7, N12

Analog supply

input

-

Analog 1.8V supply input pins. Decouple to a

solid ground plane using ceramic capacitors

located as close a possible to the appropriate

pins. Refer to evaluation platform

schematics.

VDDA_SYNTH

K1

VDDS_PRESR K3

VCC_LNA

B13

HB_VPA

M15

3.0 V digital

output

High Band PA Enable

LB_VBA

N17

3.0 V digital

output

Low Band PA Enable

VDDA_PLL

M13

Analog supply

input

-

Phase Locked Loop supply = 1.8V

Table 1.

STLC4420A signal descriptions (continued)

Pin name

Pin number

Type

Internal

resistor

Function

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