STLC2415 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC2415' PDF : 22 Pages View PDF
STLC2415
9 HCI USB TRANSPORT LAYER
The USB Transport Layer has been specified by the Bluetooth® SIG (Part H:2), and allows HCI level com-
munication between a host controller (STLC2415) and a host (e.g. PC), via a USB interface. The USB
Transport Layer is completely implemented in SW. It accepts HCI messages from the HCI Layer, prepares
it for transmission over a USB bus, and sends it to the USB Driver. It reassembles the HCI messages from
USB data received from the USB Driver, and sends these messages to the HCI Layer. The Transport Lay-
er does not interprete the contents (payload) of the HCI messages; it only examines the header.
10 POWER CLASS1 SUPPORT
The chip can control an external power amplifier (PA). Several signals are duplicated on GPIOs for this
purpose in order to avoid digital/analog noise loops in the radio.
The Class1_En register enables the alternate functions of GPIO[15:6] to generate the signals for driving
an external PA in a Bluetooth® power class1 application.
Every bit enables a dedicated signal on a GPIO pin, as described in table 12.
Table 12. Power Class 1 Functionality
Class1_En bit
involved GPIO
rxon
gpio[6]
not rxon
gpio[7]
PA0
gpio[8]
PA1
gpio[9]
PA2
gpio[10]
PA3
gpio[11]
PA4
gpio[12]
PA5
gpio[13]
PA6
gpio[14]
PA7
gpio[15]
description (when class1_En bit = ‘1’)
outputs a copy of rx_on pin to switch LNA/RF switch on/off
outputs an inverted copy of rx_on pin to switch LNA/RF switch on/off
Bit 0 of the PA value for the current connection
Bit 1 of the PA value for the current connection
Bit 2 of the PA value for the current connection
Bit 3 of the PA value for the current connection
Bit 4 of the PA value for the current connection
Bit 5 of the PA value for the current connection
Bit 6 of the PA value for the current connection
Bit 7 of the PA value for the current connection
rx_on is the same as the rx_on output pin. Not rx_on 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 base-
band core. The Power Level programmed for a certain Bluetooth® connection is manged by the firmware,
as specified in the Bluetooth® SIG spec.
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