STA2416 datasheet(35/38 Pages) STMICROELECTRONICS

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STA2416

Class1 power support

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Class1 power support

The chip can control an external power amplifier (PA). Several signals are duplicated on

GPIOs for this purpose in order to avoid digital/analogue noise loops in the radio.

A software controlled register enables the alternate functions of GPIO [15:11] [9:6]to

generate the signals for driving an external PA in a Bluetooth™ class1 power application.

Every bit enables a dedicated signal on a GPIO pin, as described in Table 13.

The signal BRXEN is the same as the RX_ON output pin. The signal NOT_BRXEN is the

inverted signal, in order to save components on the application board.

PA7 to PA0 are the power amplifier control lines. They are managed, on a connection basis,

by the baseband core. The Power Level programmed for a certain Bluetooth™ connection is

managed by the firmware, as specified in the Bluetooth™ SIG spec.

The WLAN signals, as described in Section 6.12: Bluetooth™ - WLAN coexistence in

collocated scenario on page 25, can be enabled on GIPIO pins

The WXTRA PCM sync signals, as described in Section 7.7: PCM voice interface on

page 31, can be flexibly configured on GPIO pins to connect multiple codecs.

Table 13.

GPIOs alternate functionalities

Involved GPIO

Description

GPIO0

No dedicated function

GPIO1

WLAN 1

GPIO2

WLAN 2

GPIO3

WLAN 3

GPIO4

WLAN 4

GPIO5

(Used for USB reset pull.)

GPIO6

Power Class 1 RX_ON

GPIO7

Power Class 1 NOT_RXON

GPIO8

Power Class 1 PA0 or PCM sync 1

GPIO9

Power Class 1 PA1 or PCM sync 2

GPIO11

Power Class 1 PA3

GPIO12

Power Class 1 PA4

GPIO13

Power Class 1 PA5

GPIO14

Power Class 1 PA6

GPIO15

Power Class 1 PA7

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