SPI BUS and slave devices
SPI BUS and slave devices
(OP)
Hi guys,
I have a SPI bus with several slave devices, usb controller,
tranceiver and sensors. There is an independent slave select line for each slave.
If I am not wrong most devices must have tri-state outputs that become high impedance ("disconnected") when the device is not selected.
I have a sensor that has a SPI serial data output pin, and a SPI serial data input pin. These pins are not mentioned as tristated in the datasheet. Should I add external resistors or a diode to the spitxd line?
The sensor is the following:
http:// www.freesc ale.com/we bapp/sps/s ite/prod_s ummary.jsp ?code=MMA7 455L&n odeId=0112 6911184209
Thanks!
I have a SPI bus with several slave devices, usb controller,
tranceiver and sensors. There is an independent slave select line for each slave.
If I am not wrong most devices must have tri-state outputs that become high impedance ("disconnected") when the device is not selected.
I have a sensor that has a SPI serial data output pin, and a SPI serial data input pin. These pins are not mentioned as tristated in the datasheet. Should I add external resistors or a diode to the spitxd line?
The sensor is the following:
http://
Thanks!





RE: SPI BUS and slave devices
Benta.
RE: SPI BUS and slave devices
Keith Cress
kcress - http://www.flaminsystems.com
RE: SPI BUS and slave devices
RE: SPI BUS and slave devices
The datasheet says the SDO pin is an _output_, not a _three-state-putut_
Benta.
RE: SPI BUS and slave devices
RE: SPI BUS and slave devices
Of course if this is a small quantity, then it may be better to just add the tri-state buffer and not worry about it.
Glenn
RE: SPI BUS and slave devices
RE: SPI BUS and slave devices
Keith Cress
kcress - http://www.flaminsystems.com
RE: SPI BUS and slave devices