User Manual

JukeBlox Networked Media Modules – CR Series
Datasheet
SMSC CR860/CR870 18 Revision 3.8 (01-11-12)
SMSC CONFIDENTIAL
8.2.1 Pin Descriptions
Signal(s) Type Description
POWER
VIN(+3.3V) P Power supply input ; +3.3V.
VIN (+1.2V) P Power supply input ; +1.2V.
VIN_OUTSIDE(+1.9V) P +1.9V for powering RF section. This voltage is generated internally on the module from the
3.3V supply for all current module versions. Leave these pins open.
3V3RTC P The RTC function is no longer supported. This pin should be left open.
GND P Ground (GND) connection for power supply 0V, signal returns and shielding.
SPI
SPI_DOUT O SPI data from DM870 to host controller.
SPI_DIN I SPI data from host controller to DM870.
SPI_CLK I SPI clock from host controller to DM870. Maximum recommended frequency is 2MHz,
typical frequency is 1MHz. See Note 2 below.
SPI_NCS0 I SPI chip select from host controller to DM870.
PDOUT1 O This signal is used as SPI_REQ, SPI request signal, from DM870 to host controller for
eDMP applications. Logic 1 indicates that there is an SPI message waiting to be read, the
host controller should start the SPI clock and read any changed registers. Logic 0
indicates that all changed register messages have been read and the message buffer is
empty. Also GPIO-06.
SPI_NCS1 I Not used. Leave open.
UART
RXD1 I UART1 input to the DM870, used for shell access. SMSC recommends providing a
connection to an external RS-232 transceiver and DB9 connector to connect to a PC COM
port. Such a connection can be used for product development debugging, and for module
programming control on the product manufacturing line and for module control during
certification procedures.
TXD1 O UART1 output from the DM870, used for shell access. SMSC recommends providing a
connection to an external RS-232 transceiver and DB9 connector to connect to a PC COM
port. Such a connection can be used for product development debugging, and for module
programming control on the product manufacturing line and for module control during
certification procedures.
RXD0 I UART0 input. Optionally used for controlling an iPod via UART.
TXD0 O UART0 output. Optionally used for controlling an iPod via UART.