Read data is 0XF4,0X53,0XFE, how to parse?
[edited by: ljln119 at 3:25 AM (GMT 0) on 14 Jan 2020]
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Looking at the timing diagram of Figure 3a, I think there could be something wrong with your communication with the ADC. The first two bits should always be zeros. Can you provide an oscilloscope photo…
When B0 is sent, the received data is hexadecimal 88,40, F0.Actual channel B0= 0.260v.When sending B1, the received data is hexadecimal E8,A7,FC, and the actual channel B1=2.495V.The Numbers don't match…
Looking at the timing diagram of Figure 3a, I think there could be something wrong with your communication with the ADC. The first two bits should always be zeros. Can you provide an oscilloscope photo showing CSL, SCK, SDI and SDO? A schematic of your circuit would also be helpful.
Thank you very much!Another question, I set the maximum charging current 2A, and the charging cut-off voltage 2.6v. Why is the charging current 1.7a when the charging voltage is 2.2v? As the voltage rises, the current is gradually decreasing?I understand that the working mode of ltc2439-1 is constant current 2A first, and the current gradually decreases after reaching the voltage of 2.6v until the charging is completed.Why not me?
Ltc2439-1 chip, internal shock MCU communicate with other SPI, MCU send channel command after waiting for how long to start reading?
After MCU sends the read command, how long will it take for ltc2439-1 to be converted and the MCU to read the data?
See Table4 for specification, conversion time 147ms.
At present, I send the channel command with a delay of 200ms, then send the read command with a delay of 200ms, then read the data.
Why is this chip communicating so slowly?The display speed of the touch screen is too slow to refresh.
It would be nice to have an ltc2439-1 communicator example available!
The problem now is that the ltc2439-1 data read time is too slow.
My reading order is: send channel command -> delay 200ms-> send read command -> delay 200ms-> receive data.
The data received should now be correct.That's how long it takes to read?It would be even better to have program examples!Thank you very much!
As I mentioned previously, this is a relatively old device. There are no code examples available. Newer devices are available with faster conversion times and code examples. The LTC2448 and LTC2449 are 16 channel ADCs that can sample up to 8ksps and both have code examples available.
As can be seen from the table, the conversion time of LTC2488 is 145ms, which is also very slow. My design is used by LTC2488 and LTC6811 at the same time. It would be nice if the communication speed of LTC2488 is the same as that of LTC6811, thank you!
How to obtain the BUSY signal of LTC2448?After the signal needs to be isolated, it is sent to the MCU for collection. The BUSY signal is directly connected to the input negative end of the optocoupler and absorbs the current, ok?
Waiting for your reply, thank you!