參數(shù)資料
型號： HDJD-J822
英文描述： Agilent HDJD-J822-SCR00 Color Management System Feedback Controller
中文描述： 安捷倫HDJD - J822 - SCR00色彩管理系統(tǒng)反饋控制器
文件頁數(shù)： 4/18頁
文件大小： 118K
代理商： HDJD-J822
4
Pin Descriptions
XRST (Pin 1)
Global, asynchronous, active-low
system reset. When asserted low,
XRST resets all registers.
Minimum reset pulse low is
10
μ
s and must be provided by
external circuitry.
SLEEP (Pin 2)
When asserted high, SLEEP puts
the device into sleep mode. In
sleep mode, all analog circuits are
powered down and the clock
signal is gated away from the core
logic.
CLK_SEL (Pin 3)
CLK_SEL is used to select
between internal and external
clock modes. Internal clock mode
is selected when CLK_SEL=0 and
external clock mode is selected
when CLK_SEL=1.
A1, A0 (Pin 4, Pin 5)
A1 (MSB) and A0 (LSB) define the
lower two bits of the I
2
C slave
address.
SDA (Pin 6)
The SDA pin is the I
2
C data I/O
pin. SDA is a bi-directional pin.
The I/O direction is defined by an
internal signal generated by the
I
2
C interface block.
SCL (Pin 7)
The SCL pin is the I
2
C clock pin.
TEST (Pin 8)
Connect to digital ground (DVSS).
COLOR, BRIGHT (Pin 9, Pin 10)
COLOR and BRIGHT are button
interface pins. Asserting COLOR
high with BRIGHT low makes the
output color go up a color
selection ‘slider.’ To effect a
direction change, COLOR and
BRIGHT must be asserted
simultaneously for at least 0.1
second. Now, asserting COLOR
with BRIGHT low makes the
output color go down the color
selection slider.
Button brightness control follows
a similar procedure. Asserting
BRIGHT high with COLOR low
increases or decreases brightness
depending on the direction. To
effect a direction change, COLOR
and BRIGHT must be asserted
simultaneously for at least 0.1
second.
(
Refer to
Application
Note 5070
for color selection
‘slider.’
)
CLK_EXT (Pin 11)
CLK_EXT is the external clock
input pin. Users can choose to
use an external clock instead of
the internal clock generator by
setting CLK_SEL to high.
PWM_R, PWM_G, PWM_B (Pin 16,
Pin 15, Pin 14)
The PWM_R, PWM_G, and
PWM_B output pins drive the
external LED drivers that drive
the LED arrays. Typically PWM_R
drives only the red LEDs, PWM_G
drives only the green LEDs and
PWM_B drives only the blue
LEDs. They are the output enable
signals of the red, green and blue
LED drivers. So, they control the
on-time duration of the LEDs.
The assertion level of the PWM*
signals can be toggled by the user
to support both active-low and
active-high enable input pins at
the LED driver side. This is done
by configuring the PWML bit of
register CONFIG1.
ERR_FLAG (Pin 17)
The ERR_FLAG pin is asserted
high when an error condition is
detected. The user can determine
the type of error by reading the
ERROR register. The error
conditions are described in the
‘High Level Description’ section.
SENSE_X, SENSE_Y, SENSE_Z (Pin
23, Pin 22, Pin 21)
The SENSE_X, SENSE_Y and
SENSE_Z pins are analog input
pins which are tied to the
X-channel, Y-channel and
Z-channel of the photosensor
output respectively. An averaging
filter is placed in between the
sensor output and the SENSE_X,
SENSE_Y and SENSE_Z pins. The
filter is typically a 68 k
-1
μ
F
single-pole low-pass filter.
VREF_EXT (Pin 20)
The VREF_EXT pin is an analog
input pin, which provides an
external reference voltage for the
ADC. Typically, users will use the
internal reference generator to
operate the ADC. However, in
specific application conditions,
an external reference may be
required. The external reference
is enabled by setting the VREFS
bit of register CONFIG1 high.
ROSC (Pin 19)
A 68 k
precision 1% resistor is
connected from the ROSC to
AVSS pin for use by the internal
oscillator. In external clock
mode, ROSC can be left floating.
(Refer to
Application Note 5070
for resistor selection.)
DVDD, DVSS, AVDD, AVSS (Pin 12,
Pin 13, Pin 24, Pin 18)
HDJD-J822 has separate power
ground nets for the analog and
digital section. A star connection
from a central power source is
recommended when designing
the wiring to these supply pins.
DVDD = Digital positive supply
DVSS = Digital ground
AVDD = Analog positive supply
AVSS = Analog ground
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