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参数资料
| 型号： | TMDS261BPAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 24/49页 |
| 文件大小： | 11321K |
| 代理商： | TMDS261BPAGR |
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Master
Slave
DriverR
Driver T
V
Rdd
R
Rup
C
CABLE
C
SOURCE
C
I
C
O
C
slave
V
Tdd
R
Tup
C
medium
RSCL
RSDA
9thClockPulse- AcknowledgeFromSlave
TSCL
TSDA
9thClockPulse- AcknowledgeFromSlave
V
OL
OfSlave
V
OL
OfDriver T
I
2C Pullup Resistors
SLLS987 – SEPTEMBER 2009 .......................................................................................................................................................................................... www.ti.com
Figure 42. Typical Application
Figure 43 illustrates the waveforms seen on the R-side I2C-bus when the master writes to the slave through the
I2C repeater circuit of the TMDS261B. This looks like a normal I2C transmission, and the turnon and turnoff of the
acknowledge signals are slightly delayed.
Figure 43. Bus-R Waveform
Figure 44 illustrates the waveforms seen on the T-side I2C-bus under the same operation as in Figure 43. 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 eighth 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 be 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 TMDS261B I2C repeater is below 0.4 V to be recognized by the device and then transmitted to the R-side I2C
bus.
Figure 44. Bus-T Waveform
The pullup 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.
30
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS261B
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