Table 3-17. Spi I/O; Table 3-18. Usb I/O - Motorola APX 5000 Service Manual

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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
The host processor is connected to the 3.3V SDRAM using a synchronous interface. The host
processor is connected to the OMAP on the vocon by a full-speed USB (D11 & D12). VBus is a
sense line only.
Signal Name
GPIO19
GPIO20
DP
DM
VBUS

Table 3-17. SPI I/O

Pad Name GPIO
Function
PA09 9 B
PA10 10 A
PA11 11 A
PA12 12 A
PA13 13 A

Table 3-18. USB I/O

Pin Name Pad Name
C12 PA19
D10 PA20
D11 –
D12 –
E12 –
Theory of Operation
MUX Expansion Board
Schematic Name
SPIO_CS2
NFC_CS
SPIO_MISO
SPIO_MOSI
SPIO_CLK
Expansion Board
Schematic Name
USB_BOOT_3.3V
ATMEL_BOOT
BT_AVR_USB_DP
BT_AVR_USB_DM
BT_AVR_VBUS
: Bluetooth
I/O
O
O
I
O
O
I/O
I
I
I/O
I/O
I