BC352239A Datasheet, PDF (96/116 Pages) List of Unclassifed Manufacturers – BlueCore 3-Multimedia External

Device Terminal Descriptions
8.9.1 PIO Defaults for BTv1.2 HCI Level Bluetooth Stack
I/O Terminal
PIO[0]
PIO[1]
PIO[2]
PIO[3]
PIO[4]
PIO[5]
PIO[6]
PIO[7]
PIO[8]
AIO[0]
AIO[2]
Description
Pull high on boot up to select USB transport rather than BCSP
Control output for external LNA after boot up completion
Pull high on boot up to select 16MHz reference clock frequency rather than 26MHz
Control output for external PA (Class 1 operation) after boot up completion
Clock request output
Clock request “OR” gate input
UART Bypass (UART_TX)
UART Bypass (UART_RTS)
UART Bypass (UART_CTS)
E²PROM (SCL)
UART Bypass (UART_RX)
E²PROM (SDA)
E²PROM (write protect)
32kHz sleep clock input
Vref output. Must be decoupled
Table 8.11: PIO Defaults
Important Note:
CSR cannot guarantee that these terminal functions remain the same. Please refer to the software release
note for the implementation of these PIO lines, since they are firmware build specific.
8.10 I²C Interface
PIO[8:6] can be used to form a Master I²C interface. The interface is formed using software to drive these lines.
Therefore it is suited only to relatively slow functions such as driving a dot matrix liquid crystal display (LCD),
keyboard scanner or EEPROM.
Notes:
PIO lines need to be pulled-up through 2.2kΩ resistors.
PIO[7:6] dual functions, UART bypass and EEPROM support, therefore devices using an EEPROM cannot
support UART bypass mode.
For connection to EEPROMs, refer to CSR documentation on I²C EEPROMS for use with BlueCore. This
provides information on the type of devices which are currently supported.
+1.8V
10nF
PIO[8]
PIO[6]
PIO[7]
2.2KΩ 2.2KΩ 2.2KΩ
U2
8 _{VCC A0} 1
7 _WP
A1 ²
6 _SCL
A2 ³
5 _{SDA GND} 4
Serial EEPROM
(AT24C16A)
Figure 8.33: Example EEPROM Connection
BC352239A-ds-001Pc
© Cambridge Silicon Radio Limited 2004
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