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7.8.1
ARM controller
Refer to
Figure 7-13
below for signal interfacing to and from the
ARM controller. The ARM controller is located on the DC/DC
board (item no. 7302) or AL panel (item no. 7102).
S D A
S da1
S C L
S c l1
S E L1
t bd
S E L2
t bd
AR M
Tx D
Tx d0
R x D
R x d0
Figure 7-13 ARM controller interface
Data transfer between ARM processor and LED drivers is
executed by a Serial Peripheral Interface (SPI) bus interface.
Am b ilig h t m o d u le 1
L E D
D R IV E R
1
A R M
Figure 7-12 Interface between Ambi Light and SSB
SPI C LO C K
S c k
SPI LATC H
P 0. 7
SPI LATC H 2
(only on dc/dc for aurea)
P 0. 8
SPI D ATA O U T
M O S I
PW M C LO C K
M A T0.0
SPI D ATA R ETU R N
M I S O
BLAN K
M A T1.0
PR O G
t bd
C S EEPR O M
t bd
TEM P
P 0. 10
18310_204_090318.eps
090318
A m b ilig h t m o d u le 2
S o ut
S in
L E D
D R IV E R
SPI d ata return
SPI c lo c k (SC LK)
SPI latc h (XLAT )
PR O G (VPR G )
BLAN K
PW M C LO C K ( G SC LK)
Circuit Descriptions
The SPI bus is a synchronous serial data link standard that
operates in full duplex mode.
For debugging purposes, the working principle is given below:
•
At startup the controller will read-out matrix data from the
EEPROM devices (via SPI DATA RETURN)
•
Before operation, the driver current is set via SPI, with
driver in DC mode
•
During normal operation the controller receives RGB-,
configuration-, operation mode- and topology data via I
•
The controller converts the I
to SPI LED data
•
Via data return the controller receives error data (if
applicable).
Also PWM clock and BLANK signals are generated by the
controller. The controller can be reprogrammed via I
USB). The controller can receive matrix values via I
will be stored in the EEPROM of each AL module via the SPI
bus. The temperature sensor in each AL module controls the
TEMP line; in case of a too high temperature the controller will
reduce the overall brightness.
7.8.2
LED driver communication (via SPI bus)
Refer to
Figure 7-14
ARM controller and the LED drivers on the AL boards, and the
LED drivers and the EEPROMs on the AL boards.
S o ut
S in
2
Q549.2E LA
7.
18310_203_090317.eps
090317
2
C RGB data via the matrixes
below for signal interfacing between the
A m b ilig h t m o d u le N
S o ut
L E D
D R IV E R
N
18310_205_090318.eps
090318
EN 51
2
C
2
C (via
2
C, which
2009-May-08
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