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參數資料
| 型號： | TMDS442PNPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | PLASTIC, TQFP-128 |
| 文件頁數： | 29/45頁 |
| 文件大小： | 1977K |
| 代理商： | TMDS442PNPRG4 |
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RSCL
RSDA
9thClockPulse- AcknowledgeFromSlave
TSCL
TSDA
9thClockPulse- AcknowledgeFromSlave
V
OL
OfSlave
V
OL
OfDriver T
TSDA
TSCL
TMDS141
RSDA
RSCL
EN
SDA_SINK
SCL_SINK
TMDS442
SDA
SCL
EN
SDA
SCL
BUS
MASTER
SDA
SCL
BUS
SLAVE
TSDA
TSCL
TMDS141
RSDA
RSCL
EN
3.3V
Source
Sink
Repeater
Rup
SOURCE
Rup
2
Rup
1
C
1
C
2
C
3
C
3
C
1
5V
C
2
5V
Rup
SINK
C
2
5V
Rup
SINK
C
2
Rup
SOURCE
I
2C Pull-up Resistors
R
up(min) + VDD lsink
(1)
SLLS757A – AUGUST 2006 – REVISED MARCH 2007
Figure 37. Bus R Waveform
Figure 38 illustrates the waveforms seen on the T-side I2C-bus under the same operation in Figure 37. On the
T-side of the I2C repeater, the clock and data lines would have a positive offset from ground equal to the VOL of
the driver T. After the 8th clock pulse, the data line is pulled to the VOL of the slave device which is very close to
ground in this example. At the end of the acknowledge, the slave device releases and the bus level rises back to
the VOL set by the driver until the R-side rises above VCC/2, after which it continues to high. It is important to note
that any arbitration or clock stretching events require that the low level on the T-side bus at the input of the
TMDS442 I2C repeater is below 0.4 V to be recognized by the device and then transmitted to the R-side I2C bus.
Figure 38. Bus T Waveform
The I2C circuitry inside the TMDS442 allows multiple stage operation as shown in Figure 39. I2C-Bus slave
devices can be connected to any of the bus segments. The number of devices that can be connected in series is
limited by repeater delay/time of flight considerations for the maximum bus speed requirements.
Figure 39. Typical Series Application
The pull-up resistor value is determined by two requirements:
1. The maximum sink current of the I2C buffer:
The maximum sink current is 3 mA or slightly higher for an I2C driver supporting standard-mode I2C
operation,.
2. The maximum transition time on the bus:
The maximum transition time, T, of an I2C bus is set by an RC time constant, where R is the pull-up resistor
Copyright 2006–2007, Texas Instruments Incorporated
35
Product Folder Link(s): TMDS442
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