STLC2415 STMicroelectronics, STLC2415 Datasheet - Page 18

• Manufacturer Part Number: STLC2415
• Description: Bluetooth Class I 1.8V 0.721Mbps 120-Pin LFBGA
• Manufacturer: STMicroelectronics

Specifications of STLC2415

• Package: 120LFBGA
• Power Class: Class I
• Maximum Data Rate: 0.721 Mbps
• Operating Supply Voltage: 1.8 V
• Lead Free Status / Rohs Status: Supplier Unconfirmed

STLC2415
Figure 8. PCM Interface Timing
8
The UART Transport Layer has been specified by the Bluetooth
communication between a host controller (STLC2415) and a host (e.g. PC), via a RS232 interface.
The objective of this HCI UART Transport Layer is to make it possible to use the Bluetooth
serial interface between two UARTs on the same PCB. The HCI UART Transport Layer assumes that the
UART communication is free from line errors.
8.1 UART Settings
The HCI UART Transport Layer uses the following settings:
– Baud rate: Configurable (Default baud rate: 57.600 kbps)
– Number of data bits: 8
– Parity bit: no parity
– Stop bit: 1 stop bit
– Flow control: RTS/CTS
– Flow-off response time: 3 ms
Flow control with RTS/CTS is used to prevent temporary UART buffer overrun. It should not be used for
flow control of HCI, since HCI has its own flow control mechanisms for HCI commands, HCI events and
HCI data.
If CTS is 1, then the Host/Host Controller is allowed to send.
If CTS is 0, then the Host/Host Controller is not allowed to send.
The flow-off response time defines the maximum time from setting RTS to 0 until the byte flow actually
stops. The signals should be connected in a null-modem fashion; i.e. the local TXD should be connected
to the remote RXD and the local RTS should be connected to the remote CTS and vice versa.
Figure 9. UART Transport Layer
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HCI UART TRANSPORT LAYER
PCM_B/A out
PCM_SYNC
PCM_A/B in
PCM_CLK
BLUETHOOTH
HOST
t
WCH
HCI UART TRANSPORT LAYER
t
WSH
t
WCL
BLUETHOOTH HCI
t
SSC
MSB
MSB
MSB-1
t
SDC
MSB-1
t
DCD
MSB-2
MSB-2
BLUETHOOTH
CONTROLLER
®
MSB-3
t
SIG ( Part H:3), and allows HCI level
HCD
HOST
MSB-3
MSB-4
D02TL557
D02TL556
MSB-4
®
HCI over a