Hyundai HPT-4205, Руководство по обслуживанию

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Plasma TV Service Manual 14/03/2005
• No occurrence of disturbance pulses at the output
• Short settling time after power on (<200_s)
12.25. PCF8591
12.25.1. General Description
The PCF8591 is a single-chip, single-supply low power 8-bit CMOS data acquisition device with four
analog inputs, one analog output and a serial I
2
C-bus interface.
Three address pins A0, A1 and A2 are used for programming the hardware address, allowing the use of
up to eight devices connected to the I
2
C-bus without additional hardware. Address, control and data to
and from the device are transferred serially via the two-line bidirectional I
2
C-bus.
The functions of the device include analog input multiplexing, on-chip track and hold function, 8-bit
analog-to-digital conversion and an 8-bit digital-to-analog conversion. The maximum conversion rate is
given by the maximum speed of the I
2
C-bus.
12.25.2. Features
• Single power supply
• Operating supply voltage 2.5 V to 6 V
• Low standby current
• Serial input/output via I 2 C-bus
• Address by 3 hardware address pins
• Sampling rate given by I 2 C-bus speed
• 4 analog inputs programmable as single-ended or differential inputs
• Auto-incremented channel selection
•
Analog voltage range from
VSS
to
VDD
• On-chip track and hold circuit
•
8-bit successive approximation A/D conversion
•
Multiplying DAC with one analog output.
12.25.3. Pinning
SYMBOL PIN DESCRIPTION
AINO 1 analog inputs (A/D converter)
AIN1 2
AIN2 3
AIN3 4
A0 5 hardware address
A1 6
A2 7
V
SS
8 negative supply voltage
SDA 9 I
2
C-bus data input/output
SCL 10 I
2
C-bus clock input
OSC 11 oscillator input/output
EXT 12 external/internal switch for oscillator input
AGND 13 analog ground
V
REF
14 voltage reference input
AOUT 15 analog output (D/A converter)
V
DD
16 positive supply voltage
12.26. PW1231
12.26.1. General Description
The PW1231 is a high-quality, digital video signal processor that incorporates Pixelworks ’ patented
deinterlacing, scaling, and video enhancement algorithms. The PW1231 accepts industry-standard
video formats and resolutions, and converts the input into any desired output format.The video
algorithms are highly efficient, providing excellent quality video.