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{
"ticketNumber" : "887790",
"reporterName" : "user6136286",
"rankPoints" : "60",
"resolutionStatus" : "TI Thinks Resolved",
"ticketName" : "SM72442: question of I2C write data sequence.",
"rankName" : "Prodigy",
"replies" : " 11",
"views" : " 60",
"queryText" : "Part Number: SM72442 in the datasheet of SM72442, for I2C write sequence there is 8 data bytes from frame 4 to frame 11. if frame 4 is data 1, why frame 11 is data 7(it should be data 8)? ,and one of I2C registers is 7 bytes long, why write 8 bytes data?",
"partNumber" : " SM72442",
"allResponseList" : [ {
"contentId" : "3282665",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Mar 11, 2020 11:49 AM",
"userId" : "3706612",
"content" : "Hi i think it should be a typo. the data bytes is 7 instead of 8 from frames 5 to 11. I don't have EVM as it is quite old device. do you have an IC to try?"
}, {
"contentId" : "3283646",
"userName" : "user6136286",
"rankPoints" : "60",
"rankName" : "Prodigy",
"date" : "Mar 12, 2020 1:04 AM",
"userId" : "6136286",
"content" : "thank you so much. I am writing the software , so should i think the frame 11 is no need. please check page 14 of the datasheet of SM72442, NOW the hardware is not ready ,so i cannot test on the software ,but i want to write the right sofeware."
}, {
"contentId" : "3292003",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Mar 20, 2020 1:10 AM",
"userId" : "3706612",
"content" : "Hi, i think you are right. the data is from frame 4~ frame 10. I will also try this after getting the EVM."
}, {
"contentId" : "3301681",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Mar 31, 2020 6:50 AM",
"userId" : "3706612",
"content" : "Hi User, sorry for the late, but i'm still waiting for the EVM. thanks for your understanding."
}, {
"contentId" : "3313043",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Apr 12, 2020 3:08 AM",
"userId" : "3706612",
"content" : "Hi User, i got the EVM, and will try the I2C. what is the status in your side?"
}, {
"contentId" : "3320752",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Apr 20, 2020 5:41 AM",
"userId" : "3706612",
"content" : "Hi, your understanding is correct. the data frame should be from 4 to 10. the 11 is not need. let me know you see issue."
}, {
"contentId" : "3320773",
"userName" : "user6136286",
"rankPoints" : "60",
"rankName" : "Prodigy",
"date" : "Apr 20, 2020 6:02 AM",
"userId" : "6136286",
"content" : "THANK YOU for your work, I think this problem is fixed, now I change this chip to 72445 , 72442 need so high frequency PWM ， my NMOS can not work well, MY another question ,do you have saw it?"
}, {
"contentId" : "3327910",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Apr 25, 2020 11:35 PM",
"userId" : "3706612",
"content" : "Hi Sorry, which question do you refer to?"
}, {
"contentId" : "3328187",
"userName" : "user6136286",
"rankPoints" : "60",
"rankName" : "Prodigy",
"date" : "Apr 27, 2020 12:57 AM",
"userId" : "6136286",
"content" : "IT is difficult to Calculate the value of inductance and capacitance, I have find the ripple of No load output Voltage achieved 20%, the inductance is 22UH capacitance is one single Electrolytic capacitor of 330uf。 the load is BLDC motor ， not charge for battery, is some problem ?? can you check for me ,of course if you have time, thank you if you have time I will send to the Schematic diagram, now I hope you just give some advice about how to select the inductance and capacitance. best regard"
}, {
"contentId" : "3329899",
"userName" : "Jasper Li",
"rankPoints" : "37445",
"rankName" : "Mastermind",
"date" : "Apr 28, 2020 5:02 AM",
"userId" : "3706612",
"content" : "could you share the schematic? also share the VIN and VOUT waveform to show that your observation."
} ],
"tags" : [ "/support/power-management/f/196/tags/SM72442", "/support/power-management/f/196/tags/_2300_%2b%2b%2b%2b%2bI2C" ],
"fourmType" : "TI"
} |