User Manual

Preliminary Data Sheet: CX Series
JukeBlox Networked Media Modules
dat_CX860_CX870_1_7_datasheet_c.doc PRELIMINARY - CONFIDENTIAL Version 1.7 – May 13
th
2011 - Page 13 of 23
The pinout and signal names are shown on the next page. The following table provides an overview
for the most important control and interface signals.
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 (+1.9V) P Power Supply input; +1.9V for powering RF section. Make sure this is a clean supply.
3V3RTC P For module versions without Real Time Clock (RTC) option, and for module versions with
RTC option where the RTC function is not used, this pin should be left open. For module
versions with RTC option, and the RTC function is used, then this pin should be connected
to the positive terminal of a 1F capacitor connected to GND. This capacitor will power the
RTC circuits in the DM870 IC when the module power supply is switched off.
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. BridgeCo 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. BridgeCo 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.