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Circuit Descriptions
EN 51Q549.2E LA 7.
2009-May-08
Figure 7-12 Interface between Ambi Light and SSB
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).
Figure 7-13 ARM controller interface
Data transfer between ARM processor and LED drivers is
executed by a Serial Peripheral Interface (SPI) bus interface.
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
2
C
• The controller converts the I
2
C RGB data via the matrixes
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
2
C (via
USB). The controller can receive matrix values via I
2
C, which
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
below for signal interfacing between the
ARM controller and the LED drivers on the AL boards, and the
LED drivers and the EEPROMs on the AL boards.
18310_203_090317.eps
090317
18310_204_090318.eps
090318
ARM
SDA
SCL
SEL1
SEL2
SPI CLOCK
SPI LATCH
SPI DATA OUT
SPI DATA RETURN
PWM CLOCK
BLANK
PROG
SPI LATCH 2
(only on dc/dc for aurea)
CS EEPROM
TEMP
Scl1
Sda1
tbd
tbd
Sck
P0.7
MOSI
MISO
P0.8
TxD
RxD
Rxd0
Txd0
MAT0.0
MAT1.0
tbd
tbd
P0.10
18310_205_090318.eps
090318
Ambilight module 1 Ambilight module 2 Ambilight module N
ARM
LED
DRIVER
1
LED
DRIVER
2
LED
DRIVER
N
SPI data in
Sout Sin Sout SoutSin
SPI clock (SCLK)
SPI latch (XLAT)
PROG (VPRG)
BLANK
PWM CLOCK ( GSCLK)
out16
out16
out16
SPI data return