參數(shù)資料
型號(hào)： CH7005C-V
廠商： Electronic Theatre Controls, Inc.
英文描述： Digital PC to TV Encoder with Macrovision
中文描述： 數(shù)碼電腦電視編碼器和通過(guò)Macrovision
文件頁(yè)數(shù)： 24/49頁(yè)
文件大小： 338K
代理商： CH7005C-V
CHRONTEL
CH7005C
24
201-0000-025 Rev 2.1, 8/2/99
I
2
C Port Operation
The CH7005 contains a standard I
2
C control port, through which the control registers can be written and read. This
port is comprised of a two-wire serial interface, pins SD (bidirectional) and SC, which can be connected directly to
the SDB and SCB buses as shown in
Figure 19
.
The Serial Clock line (SC) is input only and is driven by the output buffer of the master device (also shown in
Figure 19
). The CH7005 acts as a slave, and generation of clock signals on the bus is always the responsibility of
the master device. When the bus is free, both lines are HIGH. The output stages of devices connected to the bus
must have an open-drain or open-collector to perform the wired-AND function. Data on the bus can be transferred
up to 400 kbit/s.
Figure 19: Connection of Devices to the Bus
Electrical Characteristics for Bus Devices
The electrical specifications of the bus devices’ inputs and outputs and the characteristics of the bus lines connected
to them are shown in
Figure 19
. A pull-up resistor (R
P
) must be connected to a 3.3V
±
10% supply. The CH7005 is
a device with input levels related to DVDD.
Maximum and minimum values of pull-up resistor (R
P
)
The value of R
P
depends on the following parameters:
Supply voltage
Bus capacitance
Number of devices connected (input current + leakage current = I
input
)
The supply voltage limits the minimum value of resistor R
P
due to the specified minimum sink current of 2mA at
VOL
max
= 0.4 V for the output stages:
R
P
>= (V
DD
– 0.4) / 2 (R
P
in k
)
The bus capacitance is the total capacitance of wire, connections and pins. This capacitance limits the maximum
value of R
P
due to the specified rise time. The equation for RP is shown below:
R
P
<= 10
3
/C (where: R
P
is in k
and C, the total capacitance, is in pF)
The maximum HIGH level input current of each input/output connection has a specified maximum value of 10
μ
A.
Due to the desired noise margin of 0.2V
DD
for the HIGH level, this input current limits the maximum value of R
P
.
The R
P
limit depends on V
DD
and is shown below:
R
P
<= (100 x V
DD
)/ I
input
(where: R
P
is in k
and I
input
is in
μ
A)
SCLK
IN2
DATA
IN2
DATAN2
OUT
SCB (Serial Clock Bus)
SDB (Serial Data Bus)
+DVDD
R
P
SLAVE
SCLK
IN1
DATA
IN1
DATAN2
OUT
SLAVE
SCLK
OUT
FROM
MASTER
DATA IN
MASTER
DATAN2
OUT
MASTER
BUS MASTER
SC
SD
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