你有没有找到为什么你有这么高的消费?
我有或多或少相同的问题 - 更详细地检查它:
在3.4V它消耗c.a. 145μA和2V消耗c.a.断电时45μA所有这些
模式。
当我发现时,电流由Vdd_IO绘制:
当我断开芯片Vdd的电源时,Vdd_IO& SC(通过跳线)切断I2C线,我的整个威廉希尔官方网站
板符合规格(5μA)。因此PCB很好。
如果我只连接Vdd,威廉希尔官方网站
仍然在规格范围内。但如果仅连接Vdd_IO或与Vdd和SC一起连接,则上述消耗量由万用表(Agilent 34411A)测量。
数据提议建议仅提供Vdd_IO作为保持总线未被阻塞但断开测量引擎的选项。
当提供所有电源时,我可以读取CTRL_REG1默认值0x07并成功将其设置为0x00
SC应该保持低水平吗?数据表只表明I2C需要很高。
我可以在4-5板上重现这一点。 ST有什么评论吗? .....
以上来自于谷歌翻译
以下为原文
Have you found why you have that high consumption?
I have more or less the same problem - examined it in a bit more detail:
At 3.4V it consumes c.a. 145µA and at 2V it consumes c.a. 45µA all this in power down
mode.
The current is drawn by Vdd_IO as I find:
When I disconnect the power to the chip Vdd, Vdd_IO & SC (by jumper) and cut the I2C lines my whole board goes within specs (5µA). Hence the PCB is fine.
If I connect only Vdd the circuit is still within specs. But if only Vdd_IO is connected or together with Vdd and SC then the above mentioned consumption is measured by multimeter (Agilent 34411A).
The datasheed proposes supplying only Vdd_IO as an option to keep the bus not blocked but disconnect the measurement engine.
When all power is supplied I can read the CTRL_REG1 default value of 0x07 and successfully set it to 0x00
Should the SC be kept low? The datasheet only says that it needs to be high for I2C.
I can reproduce this on 4-5 boards. Does ST have any comment, please? .....
你有没有找到为什么你有这么高的消费?
我有或多或少相同的问题 - 更详细地检查它:
在3.4V它消耗c.a. 145μA和2V消耗c.a.断电时45μA所有这些
模式。
当我发现时,电流由Vdd_IO绘制:
当我断开芯片Vdd的电源时,Vdd_IO& SC(通过跳线)切断I2C线,我的整个威廉希尔官方网站
板符合规格(5μA)。因此PCB很好。
如果我只连接Vdd,威廉希尔官方网站
仍然在规格范围内。但如果仅连接Vdd_IO或与Vdd和SC一起连接,则上述消耗量由万用表(Agilent 34411A)测量。
数据提议建议仅提供Vdd_IO作为保持总线未被阻塞但断开测量引擎的选项。
当提供所有电源时,我可以读取CTRL_REG1默认值0x07并成功将其设置为0x00
SC应该保持低水平吗?数据表只表明I2C需要很高。
我可以在4-5板上重现这一点。 ST有什么评论吗? .....
以上来自于谷歌翻译
以下为原文
Have you found why you have that high consumption?
I have more or less the same problem - examined it in a bit more detail:
At 3.4V it consumes c.a. 145µA and at 2V it consumes c.a. 45µA all this in power down
mode.
The current is drawn by Vdd_IO as I find:
When I disconnect the power to the chip Vdd, Vdd_IO & SC (by jumper) and cut the I2C lines my whole board goes within specs (5µA). Hence the PCB is fine.
If I connect only Vdd the circuit is still within specs. But if only Vdd_IO is connected or together with Vdd and SC then the above mentioned consumption is measured by multimeter (Agilent 34411A).
The datasheed proposes supplying only Vdd_IO as an option to keep the bus not blocked but disconnect the measurement engine.
When all power is supplied I can read the CTRL_REG1 default value of 0x07 and successfully set it to 0x00
Should the SC be kept low? The datasheet only says that it needs to be high for I2C.
I can reproduce this on 4-5 boards. Does ST have any comment, please? .....
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