参数资料
| 型号： | PCA9507DP,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 24B 8TSSOP |
| 产品培训模块： | I²C Bus Fundamentals |
| 特色产品： | NXP - I2C Interface |
| 标准包装： | 1 |
| 接口： | I²C，SM 总线 |
| 输入/输出数： | 2 输入，2 输出 |
| 中断输出： | 无 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 标准包装 |
| 其它名称： | 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.
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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| PCA9507DP-T | 功能描述:接口-信号缓冲器、中继器 LEVEL TRANSL I2C BUS REPEATER RoHS:否 制造商:Texas Instruments 工作电源电压: 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:VSSOP-8 封装:Reel |
| PCA9507D-T | 功能描述:接口-信号缓冲器、中继器 LEVEL TRANSL I2C BUS REPEATER RoHS:否 制造商:Texas Instruments 工作电源电压: 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:VSSOP-8 封装:Reel |
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