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參數(shù)資料
型號(hào)： PCA9507DP,118
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 24B 8TSSOP
產(chǎn)品培訓(xùn)模塊： I²C Bus Fundamentals
特色產(chǎn)品： NXP - I2C Interface
標(biāo)準(zhǔn)包裝： 1
接口： I²C，SM 總線
輸入/輸出數(shù)： 2 輸入，2 輸出
中斷輸出： 無
頻率 - 時(shí)鐘： 400kHz
電源電壓： 2.7 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-TSSOP
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： 568-5924-6
PCA9507_1
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 7 February 2008
5 of 20
NXP Semiconductors
PCA9507
2-wire serial bus extender for HDMI DDC I2C-bus and SMBus
6.3 Resistor pull-up value selection
6.3.1 Port A (SDAA and SCLA)
SDAA and SCLA are open-drain I/O that have rise time accelerators and strong pull-down.
When the inputs transition above 0.3VCC(A), the rise time accelerator activates and boosts
the pull-up current during rising edge to meet the I2C-bus rise time specication when the
device drives a long cable or heavier capacitance load. The strong pull-down enables the
output to drive to nearly zero voltage for logic LOW. The selection for pull-up resistors are
dened in the HDMI DDC specication shown in Table 3. For HDMI transmitter
applications like digital video player, recorder, or set-top box, the pull-up resistor is in the
range of 1.5 k
to 2 k. For HDMI receiver applications like in LCD TV or video card, the
pull-up resistor is 47 k
on the SCLA line, and there is no pull-up on the SDAA line.
Please refer to Table 3, Figure 7 and Figure 8 for more details. Figure 5 shows the port A
pull-up resistor values (in k
) versus capacitance load (in nF) for 5 V supply voltage
complied with 1
s rise time per I2C-bus Standard-mode specication. The graph
contrasts a shaded and unshaded region. Any resistor value chosen within the unshaded
region would comply with 1
s rise time, while any value chosen in the shaded region
would not.
Table 3.
HDMI DDC pull-up resistors specication
Pin
Where
Minimum
Maximum
SDAA
at the source (DVD/STB)
1.5 k
2.0 k
at the sink (LCD TV)
-
SCLA
at the source (DVD/STB)
1.5 k
2.0 k
at the sink (LCD TV)
47 k
± 10 %
rise time = 1
s; V
CC(A) =5V
Fig 5.
SDAA/SCLA line pull-up resistor versus load capacitance
CL (nF)
0
4.0
3.0
2.0
1.0
002aad620
4.5
6.5
2.5
8.5
10.5
RPU
(k
)
0.5
does not comply with
1
s rise time
complies with
1
s rise time
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