STLC4420A datasheet(7/40 Pages) STMICROELECTRONICS

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STLC4420A

Pin descriptions

7/40

REF_CLK

N10

Clock input

Reference clock input (19.2, 26.0, 38.4 or

40.0 MHz). Use a 1000pF typical series

blocking capacitor.

LF_XTAL_IN

B23

1.8 V (VIO) digital

input

32KHz typical sleep clock input from host.

SPI_CLK

B22

1.8 V (VIO) digital

input

SPI clock from host

SPI_CSX

A20

1.8V (VIO) digital

input

SPI chip select from host

SPI_DIN

D24

1.8 V (VIO) digital

I/O

SPI data input for 4-wire modes. In 3-wire

modes, this is the data input/output signal.

SPI_DOUT

B17

1.8 V (VIO) digital

output

SPI data output for 4-wire modes only.

In SDIO mode pin = DAT0.

FREQ

C21

1.8 V (VIO) GPIO

(input)

No Pull

Firmware controlled GPIO typically

implementing Bluetooth coexistence FREQ

input function. Assigned to ARM MAC GP2-6.

RF_ACTIVE

E24

1.8 V (VIO) GPIO

(input)

No Pull

Firmware controlled GPIO typically

implementing Bluetooth coexistence

RF_ACTIVE input function. Assigned to ARM

MAC GP2-5.

STATUS

A19

1.8 V (VIO) GPIO

(input)

No Pull

Firmware controlled GPIO typically

implementing Bluetooth coexistence STATUS

input function.

Assigned to ARM MAC GP2-4.

TX_CONF

B19

1.8 V (VIO) GPIO

(output)

No Pull

Firmware controlled GPIO typically

implementing Bluetooth coexistence

TX_CONF output function.

Assigned to ARM MAC GP2-3.

MODE0

1.8 V digital input

MODE strapping pins are pimarily used to

properly initialize the PLL for following

REF_CLK frequencies.

Connect appropriate pin to ground plane for a

logic 0 input or to 1.8V power plane (through

a 4kohm resistor) for a logic 1.

MODE(1:0) = 00 => 19.2 MHz

MODE(1:0) = 01 => 40 MHz default, no pull

needed

MODE(1:0) = 10 => 26 MHz

MODE(1:0) = 11 => 38.4 MHz

(Note: M5=RX0, L6=RX1)

MODE1

1.8 V digital input

HISPEED_

BUS_SEL

1.8 V digital input

High speed internal bus selection input.

Needs to be pulled down through 2.5K ohm to

set the proper high speed bus mode.

(Note: N4 = ANTSELTST+)

Table 1.

STLC4420A signal descriptions (continued)

Pin name

Pin number

Type

Internal

resistor

Function

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