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| 型号： | SC18IS600IBS,151 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 总线控制器 |
| 英文描述： | I2C BUS CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT616-3, HVQFN-24 |
| 文件页数： | 28/30页 |
| 文件大小： | 164K |
| 代理商： | SC18IS600IBS,151 |
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SC18IS600_601_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 28 July 2008
7 of 30
NXP Semiconductors
SC18IS600/601
SPI to I2C-bus interface
6.2.1.1
Quasi-bidirectional output conguration
Quasi-bidirectional outputs can be used both as an input and output without the need to
recongure the pin. This is possible because when the pin outputs a logic HIGH, it is
weakly driven, allowing an external device to pull the pin LOW. When the pin is driven
LOW, it is driven strongly and able to sink a large current. There are three pull-up
transistors in the quasi-bidirectional output that serve different purposes.
One of these pull-ups, called the ‘very weak’ pull-up, is turned on whenever the pin latch
for the pin contains a logic 1. This very weak pull-up sources a very small current that will
pull the pin HIGH if it is left oating.
A second pull-up, called the ‘weak’ pull-up, is turned on when the pin latch for the pin
contains a logic 1 and the pin itself is also at a logic 1 level. This pull-up provides the
primary source current for a quasi-bidirectional pin that is outputting a 1. If this pin is
pulled LOW by an external device, the weak pull-up turns off, and only the very weak
pull-up remains on. In order to pull the pin LOW under these conditions, the external
device has to sink enough current to overpower the weak pull-up and pull the pin below its
input threshold voltage.
The third pull-up is referred to as the ‘strong’ pull-up. This pull-up is used to speed up
LOW-to-HIGH transitions on a quasi-bidirectional pin when the pin latch changes from a
logic 0 to a logic 1. When this occurs, the strong pull-up turns on for two system clock
cycles quickly pulling the pin HIGH.
The quasi-bidirectional pin conguration is shown in Figure 6.
Although the SC18IS600/601 is a 3 V device, most of the pins are 5 V tolerant. If 5 V is
applied to a pin congured in quasi-bidirectional mode, there will be a current owing from
the pin to VDD causing extra power consumption. Therefore, applying 5 V to pins
congured in quasi-bidirectional mode is discouraged.
A quasi-bidirectional pin has a Schmitt-triggered input that also has a glitch suppression
circuit.
Fig 6.
Quasi-bidirectional output conguration
002aab882
2 SYSTEM
CLOCK
CYCLES
weak
strong
very
weak
VDD
PP
P
VSS
pin latch data
GPIOn,
IOn pin
glitch rejection
input data
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC18IS600IPW | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SPI to IC-bus interface |
| SC18IS600IPW,112 | 功能描述:总线收发器 INTERFACE SPI/I2C RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SC18IS600IPW,128 | 功能描述:总线收发器 SPI-I2C MSTER BRIDGE RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SC18IS600IPW/S8HP | 功能描述:SC18IS600I 制造商:nxp usa inc. 系列:- 包装:剪切带（CT） 零件状态:在售 协议:I2C 功能:控制器 接口:SPI 标准:- 电压 - 电源:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:16-TSSOP 标准包装:1 |
| SC18IS600IPW112 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
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