Table 3-13. Spi I/O; Figure 3-45. Bluetooth Lf Uart Connection Block Diagram - Motorola APX 3000 Detailed Service Manual

Theory of Operation
: Bluetooth
BT Debug
Flex
The Bluetooth IC shutdown (U2415 pin L3) and wakeup (U2415 pin K3) pins are also connected to
the host controller. A Bluetooth PTT pin on the host controller (U2415 pin J2) tells the OMAP (U6302
pin Y5) when the user pressed the PTT button on the Bluetooth accessory. As the BT IC I/O is 1.8V,
but the host controller I/O is 3.3V, level shifters are employed for interconnection between the two.
The host processor IC is connected to the LF receiver IC by a four-wire SPI bus. This SPI bus also
communicates with an on-board accelerometer. The LF transmitter circuit uses a 125 kHz signal
(U2415 pin M3) that is turned on and off (OOK) by the USART1_TX signal (U2415 pin L12).
Signal Name
SPIP – NPCS[2]
SPIP – NPCS[0]
SPIP – MISO
SPIP – MOSI
SPIP – SCK
ATMEL AVR32
AT32UC3A0512
Pin 33
Pin 34
USART2
Debug RX
K6
PB29
Pin 25
Debug TX
K7 PB30
Pin 26

Figure 3-45. Bluetooth LF UART Connection Block Diagram

Table 3-13. SPI I/O

Pad Name GPIO
PA09 9
PA10 10
PA11 11
PA12 12
PA13 13
USART0
J6
PA00
H6
PA01
J7
PA03
J8
PA04
USART1
K11
PA05
J10
PA07
L12
PA06
MUX Schematic Name
Function
B SPIO_CS2
A NFC_CS
A SPIO_MISO
A SPIO_MOSI
A SPIO_CLK
TI NL 5500
Bluetooth/GPS
A4
HCI_TX
B5
HCI_RX
B4
HCI_CTS
B7
HCI_RTS
Low Frequency
Receiver AS3930
9
DAT
10
CL_DAT
LF Transmit
(OR Gate)
I/O
O
O
I
O
O
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