STLC4420A datasheet(9/40 Pages) STMICROELECTRONICS

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STLC4420A

Pin descriptions

9/40

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

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

STLC4420A Datasheet(PDF) 9 Page - STMicroelectronics

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