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参数资料
| 型号： | DS2408S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/39页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 8-CHAN ADDRESS 16SOIC |
| 标准包装： | 2,500 |
| 接口： | 1 线 |
| 输入/输出数： | 8 |
| 中断输出： | * |
| 电源电压： | 2.8 V ~ 5.25 V |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
| 包括： | * |
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DS2408
27 of 39
3) The input buffer was designed with hysteresis. If a negative glitch crosses VTH but doesn’t go below
VTH - VHY, it will not be recognized (Figure 15, Case A). The hysteresis is effective at any 1-Wire
speed.
4) There is a time window specified by the rising edge hold-off time tREH during which glitches will be
ignored, even if they extend below the VTH - VHY threshold (Figure 15, Case B, tGL < tREH). Deep
voltage droops or glitches that appear late after crossing the VTH threshold and extend beyond the tREH
window cannot be filtered out and will be taken as the beginning of a new time slot (Figure 15, Case
C, tGL ≥ tREH).
Figure 15. NOISE SUPPRESSION SCHEME
VPUP
VTH
VHY
0V
tREH
tGL
tREH
tGL
Case A
Case C
Case B
CRC GENERATION
The DS2408 has two different types of cyclic redundancy checks (CRCs). One CRC is an 8-bit type and
is stored in the most significant byte of the 64-bit ROM. The bus master can compute a CRC value from
the first 56 bits of the 64-bit ROM and compare it to the value stored within the DS2408 to determine if
the ROM data has been received error free. The equivalent polynomial function of this CRC is X8 + X5 +
X4 + 1. This 8-bit CRC is received in the true (noninverted) form. It is computed at the factory and lasered
into the ROM.
The other CRC is a 16-bit type, generated according to the standardized CRC16-polynomial function X16
+ X15 + X2 + 1. This CRC is used for error detection when reading data through the end of the register
page using the Read PIO Registers command, for fast verification of the data transfer when writing to or
reading from the scratchpad, and when reading from the PIO using the Channel-access Read command.
In contrast to the 8-bit CRC, the 16-bit CRC is always communicated in the inverted form. A CRC-
generator inside the DS2408 chip (Figure 16) calculates a new 16-bit CRC as shown in the command
flow chart of Figure 8. The bus master compares the CRC value read from the device to the one it
calculates from the data and decides whether to continue with an operation or to reread the portion of the
data with the CRC error.
With the Read PIO Registers flow chart, the 16-bit CRC value is the result of shifting the command byte
into the cleared CRC generator, followed by the 2 address bytes and the data bytes beginning at the target
address and ending with the last byte of the register page, address 008Fh.
With the initial pass through the Channel-access Read command flow, the CRC is generated by first
clearing the CRC generator and then shifting in the command code followed by 32 bytes of PIO pin data.
Subsequent passes through the command flow will generate a 16-bit CRC that is the result of clearing the
CRC generator and then shifting in 32 bytes read from the PIO pins. For more information on generating
CRC values see Application Note 27.
相关PDF资料 |
PDF描述 |
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| DS2409P/T&R | IC COUPLER MICROLAN 1-WIRE 6TSOC |
| DS2411P+T&R | IC SILICON SERIAL NUMBER 6TSOC |
| DS2413Q+T&R | IC SWITCH 2CH ADDRESS 6-TDFN |
| DS2480B+ | IC LINE DRVR W/SENSOR 1-W 8-SOIC |
| DS2482X-100+T | IC MASTER I2C-1WIRE 1CH 9-WLP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2409 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:MicroLAN Coupler |
| DS2409FRAB0 | 制造商:Thomas & Betts 功能描述:200A,REC,3P4W,MG,3P220V,SC |
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| DS2409P | 功能描述:接口 - 专用 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| DS2409P/T&R | 制造商:Maxim Integrated Products 功能描述:IC COUPLER MICROLAN 1-WIRE 6TSOC |
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