ADBM-A350-200 Avago Technologies US Inc., ADBM-A350-200 Datasheet - Page 13

• Manufacturer Part Number: ADBM-A350-200
• Description: Vigor Colossus OFN Module
• Manufacturer: Avago Technologies US Inc.

Specifications of ADBM-A350-200

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Synchronous Serial Port
The synchronous serial port is used to set and read para-
meters in the ADBM-A350, and to read out the motion
information.
The port is a four wire serial port. The host micro-controller
always initiates communication; the ADBM-A350 never
initiates data transfers. SCLK, MOSI, and NCS may be
driven directly by a micro-controller. The port pins may be
shared with other SPI slave devices. When the NCS pin is
high, the inputs are ignored and the output is tri-stated.
The lines that comprise the 4-wire SPI port:
SCLK: Clock input. It is always generated by the master
MOSI: Input data. (Master Out/Slave In)
MISO: Output data. (Master In/Slave Out)
NCS:
Figure 6. Write Operation
Figure 7. MOSI Setup and Hold Time
13
MOSI
MISO
SCLK
MOSI
SCLK
NCS
(the micro-controller).
Chip select input (active low). NCS needs to be low
to activate the serial port; otherwise, MISO will be
high Z, and MOSI & SCLK will be ignored. NCS can
also be used to reset the serial port in case of an
error.
t
setup , MOSI
1
1
2
A
6
t
Hold,MOSI
3
A
5
4
A
4
5
A
3
MOSI Driven by Micro-Controller
6
A
2
7
A
1
Do not care
8
A
0
9
D
7
10
D
6
11
D
5
12
D
4
Chip Select Operation
The serial port is activated after NCS goes low. If NCS is
raised during a transaction, the entire transaction is
aborted and the serial port will be reset. This is true for
all transactions. After a transaction is aborted, the normal
address-to-data or transaction-to-transaction delay is
still required before beginning the next transaction. To
improve communication reliability, all serial transactions
should be framed by NCS. In other words, the port should
not remain enabled during periods of non-use because
ESD events could be interpreted as serial communica-
tion and put the chip into an unknown state. In addition,
NCS must be raised after each burst-mode transaction
is complete to terminate burst-mode. The port is not
available for further use until burst-mode is terminated.
Write Operation
Write operation, defi ned as data going from the micro-
controller to the ADBM-A350, is always initiated by the
micro-controller and consists of two bytes. The fi rst byte
contains the address (seven bits) and has a “1” as its MSB
to indicate data direction. The second byte contains the
data. The ADBM-A350 reads MOSI on rising edges of SCLK.
13
D
3
14
D
2
15
D
1
16
D
0
1
1
2
A
6