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| 型号： | PGA309EVM |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | PGA309 Evaluation Module(PGA309评估模块) |
| 中文描述： | PGA309评估模块（PGA309评估模块） |
| 文件页数： | 48/53页 |
| 文件大小： | 4221K |
| 代理商： | PGA309EVM |
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10.1 PGA309DK Two-Wire Interface and Long Leads
Effect:
When using the PGA309DK, with long leads between the “PGA309 PC Interface Board” and the “PGA309
Sensor Interface Board” for the Two-Wire Interface (SDA, SCL), while the PGA309 is operating in “Stand
Alone Mode” and the “Read ADS1100 Continuously” function is enabled, an error can occur as shown in
Figure 43.
Page 48 of 53
Figure 43: “Read ADS1100 Continuously” Error Message
Cause & Solution:
Long leads add capacitance and inductance to the SDA and SCL lines going into the “PGA309 PC Interface
Board”. Even though U10 and U11, on the “PGA309 PC Interface Board”, were intended to isolate the
“PGA309 PC Interface Board” Two-Wire Interface from the PGA309-to-EEPROM Two-Wire Interface there is
capacitive feed-through on falling edges of the PGA309-to-EEPROM Two-Wire Interface which couple into the
“PGA309 PC Interface Board” Two-Wire Interface used to communicate with the ADS1100. Since the Two-
Wire Interface does not use a low impedance pull-up (instead a 4.7k
resistor) these negative going transients
are sufficient to inject random valid low-going edges into the Two-Wire Interface on the “PGA309 PC Interface
Board”. The longer the connection wires for SDA and SCL the more the parasitic inductance and capacitance
and the larger the injected negative transients become. The Two-Wire Interface on the PGA309 was intended
for local communication between a resident EEPROM or microcontroller and the PGA309. It is recommended
that for Temperature calibration setups, as illustrated in Figure 44, that the One-Wire Interface (PRG) be used
for reliable communications.
Figure 44: Use One-Wire (PRG) Interface for Temperature Calibration
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相关代理商/技术参数 |
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|---|---|
| PGA309EVM-EU | 功能描述:光学传感器开发工具 PGA309 Eval Mod- Wldwide RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度: |
| PGA309EVM-US | 功能描述:光学传感器开发工具 PGA309 Eval Mod- US & Canada RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度: |
| PGA309EVM-USB | 功能描述:放大器 IC 开发工具 PGA309 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| PGA309EVM-USB | 制造商:Texas Instruments 功能描述:ANALOG SIGNAL CONDITIONING EVAL. MODULE |
| PGA309-HT | 制造商:TI 制造商全称:Texas Instruments 功能描述:VOLTAGE OUTPUT PROGRAMMABLE SENSOR CONDITIONER |
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