BC41B143A-ANN-E4 ETC, BC41B143A-ANN-E4 Datasheet - Page 78

• Manufacturer Part Number: BC41B143A-ANN-E4
• Description: Bluecore 4-rom CSP EDR Single Chip Bluetooth v2.0 + EDR System
• Manufacturer: ETC

11.9
PIO[8:6] can be used to form an interface. The interface is driven by “bit banging” these PIO pins using software.
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 that are currently supported.
11.10 TCXO Enable OR Function
An OR function exists for clock enable signals from a host controller and BlueCore4-ROM CSP 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
enable input and PIO[2] can be used as the OR output with the TCXO enable signal from BlueCore4-ROM CSP.
On reset and up to the time the PIO has been configured, PIO[2] is tri-stated. Therefore, the developer must
ensure that the circuitry connected to this pin is pulled via a 470kΩ resistor to the appropriate power rail. This
ensures that the TCXO is oscillating at start up.
BC41B143A-ds-002Pd
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 Master
VDD
Figure 11.29: Example TXCO Enable OR Function
This material is subject to CSR’s non-disclosure agreement
Figure 11.28: Example EEPROM Connection
Enable
PIO[8]
PIO[6]
PIO[7]
TCXO
© Cambridge Silicon Radio Limited 2005
2.2kΩ 2.2kΩ 2.2kΩ
Production Information
+1.8V
8
7
6
5
Serial EEPROM
VCC
WP
SCL
SDA
(AT24C16A)
10nF
2
C EEPROMS for use with BlueCore. This
U2
CLK IN
CLK REQ IN/
PIO[3]
CLK IN
GND
BlueCore System
A0
A1
A2
GSM System
CLK REQ OUT/
1
2
3
4
CLK REQ OUT
PIO[2]
Device Terminal Descriptions
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