BC41B143A-DS-001PE Datasheet, PDF (84/102 Pages) List of Unclassifed Manufacturers – BlueCpre 4-ROM Single Chip Bluetooth v2.0 System with EDR

Device Terminal Descriptions
10.9 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.
Note:
PIO[7:6] dual functions, UART bypass and EEPROM support, therefore devices using an EEPROM cannot
support UART bypass mode
PIO lines need to be pulled-up through 2.2kΩ resistors.
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 10.30: Example EEPROM Connection
10.10 TCXO Enable OR Function
An OR function exists for clock enable signals from a host controller and BlueCore4-ROM where either device
can turn on the clock without having to wake up the other device. PIO[3] can be used as the Host clock enables
input and PIO[2] can be used as the OR output with the TCXO enable signal from BlueCore4-ROM.
VDD
TCXO
GSM System
Enable
CLK IN
CLK REQ OUT
BlueCore System
CLK REQ IN/
PIO[3]
CLK REQ OUT/
XTAL IN
PIO[2]
Figure 10.31: Example TXCO Enable OR Function
BC41B143A-ds-001Pe
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