BC41B143A-ds-001Pe CSR, BC41B143A-ds-001Pe Datasheet - Page 84

• Manufacturer Part Number: BC41B143A-ds-001Pe
• Description: Blue Core ROM
• Manufacturer: CSR

10.9
PIO[8:6] can be used to form a Master I
Therefore it is suited only to relatively slow functions such as driving a dot matrix liquid crystal display (LCD),
keyboard scanner or EEPROM.
Note:
For connection to EEPROMs, refer to CSR documentation on I
provides information on the type of devices which are currently supported.
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.
BC41B143A-ds-001Pe
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.
I
2
C Interface
VDD
Enable
PIO[8]
PIO[6]
PIO[7]
Figure 10.31: Example TXCO Enable OR Function
TCXO
Figure 10.30: Example EEPROM Connection
This material is subject to CSR’s non-disclosure agreement
2.2KΩ 2.2KΩ 2.2KΩ
2
C interface. The interface is formed using software to drive these lines.
© Cambridge Silicon Radio Limited 2005
Production Information
+1.8V
8
7
6
5
Serial EEPROM
2
C EEPROMS for use with BlueCore. This
VCC
WP
SCL
SDA
(AT24C16A)
10nF
U2
XTAL IN
CLK IN
CLK REQ IN/
PIO[3]
BlueCore System
GND
GSM System
A0
A1
A2
CLK REQ OUT/
CLK REQ OUT
1
2
3
4
PIO[2]
Device Terminal Descriptions
Page 84 of 102