參數(shù)資料
型號(hào)： TMDS361PAG
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, TQFP-64
文件頁(yè)數(shù)： 19/43頁(yè)
文件大?。?/td> 2159K
代理商： TMDS361PAG
SLLS919A – DECEMBER 2008 – REVISED JANUARY 2009............................................................................................................................................ www.ti.com
Table 4. Value of k for Different Input Threshold Voltages
Vth–\Vth+
0.7 VDD
0.65 VDD
0.6 VDD
0.55 VDD
0.5 VDD
0.45 VDD
0.4 VDD
0.35 VDD
0.3 VDD
0.1 VDD
1.0986
0.9445
0.8109
0.6931
0.5878
0.4925
0.4055
0.3254
0.2513
0.15 VDD
1.0415
0.8873
0.7538
0.6360
0.5306
0.4353
0.3483
0.2683
0.1942
0.2 VDD
0.9808
0.8267
0.6931
0.5754
0.4700
0.3747
0.2877
0.2076
0.1335
0.25 VDD
0.9163
0.7621
0.6286
0.5108
0.4055
0.3102
0.2231
0.1431
0.0690
0.3 VDD
0.8473
0.6931
0.5596
0.4418
0.3365
0.2412
0.1542
0.0741
—
From Equation 1, Rup(min) = 5.5 V/3 mA = 1.83 k to operate the bus under a 5-V pullup voltage and provide less
than 3 mA when the I2C device is driving the bus to a low state. If a higher sink current, for example 4 mA, is
allowed, Rup(min) can be as low as 1.375 k.
Given a 5-V I2C device with input low and high threshold voltages at 0.3 Vdd and 0.7 Vdd, respectively, the value
of k is 0.8473 from Table 4. Taking into account the 1.83-k
pullup resistor, the maximum total load capacitance
is C(total-5V) = 645 pF. Ccable(max) should be restricted to be less than 545 pF if Csource and Ci can be as high as 50
pF. Here the Ci is treated as Csink, the load capacitance of a sink device.
Fixing the maximum transition time from Table 4, T = 1
s, and using the k values from Table 4, the
recommended maximum total resistance of the pullup resistors on an I2C bus can be calculated for different
system setups.
To support the maximum load capacitance specified in the HDMI spec, Ccable(max) = 700 pF/Csource = 50 pF/Ci =
50 pF, R(max) can be calculated as shown in Table 5.
Table 5. Pullup Resistor for Different Threshold Voltages and 800-pF Load
Vth–\Vth+
0.7 VDD
0.65 VDD
0.6 VDD
0.55 VDD
0.5 VDD
0.45 VDD
0.4 VDD
0.35 VDD
0.3 VDD
UNIT
0.1 VDD
1.14
1.32
1.54
1.80
2.13
2.54
3.08
3.84
4.97
k
0.15 VDD
1.20
1.41
1.66
1.97
2.36
2.87
3.59
4.66
6.44
k
0.2 VDD
1.27
1.51
1.80
2.17
2.66
3.34
4.35
6.02
9.36
k
0.25 VDD
1.36
1.64
1.99
2.45
3.08
4.03
5.60
8.74
18.12
k
0.3 VDD
1.48
1.80
2.23
2.83
3.72
5.18
8.11
16.87
—
k
Or, limiting the maximum load capacitance of each cable to 400 pF to accommodate with I2C spec version 2.1.
Ccable(max) = 400 pF/Csource = 50 pF/Ci = 50 pF, the maximum values of R(max) are calculated as shown in Table 6.
Table 6. Pullup Resistor Upon Different Threshold Voltages and 500-pF Loads
Vth–\Vth+
0.7 VDD
0.65 VDD
0.6 VDD
0.55 VDD
0.5 VDD
0.45 VDD
0.4 VDD
0.35 VDD
0.3 VDD
UNIT
0.1 VDD
1.82
2.12
2.47
2.89
3.40
4.06
4.93
6.15
7.96
k
0.15 VDD
1.92
2.25
2.65
3.14
3.77
4.59
5.74
7.46
10.30
k
0.2 VDD
2.04
2.42
2.89
3.48
4.26
5.34
6.95
9.63
14.98
k
0.25 VDD
2.18
2.62
3.18
3.92
4.93
6.45
8.96
13.98
28.99
k
0.3 VDD
2.36
2.89
3.57
4.53
5.94
8.29
12.97
26.99
—
k
Obviously, to accommodate the 3-mA drive current specification, a narrower threshold voltage range is required
to support a maximum 800-pF load capacitance for a standard-mode I2C bus.
When the input low- and high-level threshold voltages, Vth– and Vth+, are 0.7 V and 1.9 V, respectively, which is
0.15 VDD and 0.4 VDD, approximately. With VDD = 5 V from Table 5, the maximum pullup resistor is 3.59 k. The
allowable pullup resistor is in the range of 1.83 k
and 3.59 k.
26
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS361
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