A manufacturer of semiconductors, both discrete and integrated circuits.
1
vote
1answer
162 views
Relation between Mbits/s and MHz
I am trying to communicate with an ADC via SPI. In the datasheet, It is mentioned, that:
The performance of the ADC161S626 is ensured
over temperature at clock rates of 1 MHz to 5 MHz – DNL +0.8 /...
0
votes
1answer
73 views
Calculate voltage of a 16-bit differential ADC that gives a two's complement value
I am working with a 16-bit differential ADC and I would like to know the difference between this latter and a single ended ADC especially: How to calculate voltage from the ADC value ?
Is it like ...
0
votes
1answer
31 views
LM2596 Cin requirements
I'm going to use an LM2596.
My maximum input will be 40V to a fixed output 5V 3A.
I've read in the datasheet that for Cin you need 1.5x for an electrolytic capacitor. So 40V x 1.5 will be some 60V. ...
0
votes
1answer
30 views
LM2596 TO-263-5 or TO-263-6
Hi just a dumb question that I have to be sure.
I will be using LM2596
It is stated in its description: IC REG BUCK 5V 3A TO263-5
That its package is TO-263-5.
But on its package is TO-263-6, D²Pak (...
0
votes
1answer
44 views
Bluetooth notification on wearable devices with cc2640 [on hold]
I want to build a smartwatch project that can receive message or email notification. But I don't know the low level stuff of Bluetooth or BLE.
What protocol (or say service / profile / config) I ...
1
vote
2answers
40 views
Memory allocation of constants and statics in structure?
I am working on IIR Filter implementation where I am initializing filter coefficients and memory (form-2 w) memory as follows.
...
0
votes
1answer
89 views
What is the difference between MCU and TTL screens? [closed]
I'm trying to build a HDMI decoder board for a 4in 480x800 IPS display. I found an HDMI decoder board on adafruit(https://www.adafruit.com/product/2218) which says it works for most 40pin TTL displays....
3
votes
1answer
175 views
Symmetric vs Asymmetric PWM
I am working on Control of Power Converters, I was reading TI's piccolo DSP ePWM guide and came across symmetric vs asymmetric PWM, I have a good basic understanding about converters, DSP and all.
...
0
votes
0answers
38 views
BQ24133, unable to charge the battery
I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
0
votes
1answer
16 views
BQ76PL536A: Stopping measuring voltages and temperatures
I am testing a BMS design with multiple slave boards each containing one bq76PL536A connected to a common CAN bus through a ATmega32M1 MCU and a ISO1050DW isolated transceiver. The problem I am facing ...
0
votes
0answers
24 views
External assembler function for digital signal processor
I need to create external function on TMS320C5515 Fixed-Point Digital Signal Processor around BFXTR command. I need to write some value directly into memory. I ...
0
votes
1answer
43 views
differential ADC with a potentiometer in the positive input and grounded negative input
i have a problem in reading values from ads1672(datasheet). i setup this circuit:
the Reference voltage is +3.V (REF5030-TI page)
when potentiometer is @ +1.6V (i measured this by multi-meter) this ...
0
votes
2answers
57 views
what will happen if i don't use amplifier before my differential ADC
i have ADS1672Datasheet from TI. in it's datasheet circuit that is recommended for differential interface is:
but i want to remove amplifier(THS4520 datasheet-it's a Fully differential amplifier) and ...
0
votes
0answers
43 views
Identify TI motor driver IC (from old HP printer) or its control protocol
For fun, and as an exercise in reverse engineering junk hardware, I am trying to understand the internals of an HP DeskJet 840c printer from 2001.
Specifically I am trying to understand how the motor ...
0
votes
0answers
60 views
LCD colors are incorrect: problem with single line resistance?
I have developed a carrier board for a TI AM3358 system on module (SoM) from goembed. To the carrierboard is a 7 inch TFT LCD screen connected with parallel communication.
When I connect the LCD ...
0
votes
0answers
113 views
Why does this buck boost with dual MOSFETs fails output at certain input voltages at light load?
Buck boost design
A buck boost converter for 11A 45V output and 33.0-55.0V input has been designed using the Webench Power Designer. The LM5176 based PCB design was adapted for dual MOSFETs (4 times ...
0
votes
2answers
59 views
How do I compensate for Exponential decay in an op-amp circuit
Using an oscillator, I want to provide a square wave input to the second opamp circuit shown in the provided link(But using IC741 instead), the problem is in s domain:
I get a voltage input of 1/(s^s+...
0
votes
0answers
42 views
How to use Logic Analyzer and Event Viewer in Keil uVision with TM4C123GXL launchpad
I am using Keil uVision5 for programming TI launchpad TM4C123GXL with TIVA WARE Library.
How to use Logic Analyzer and Event Viewer in Keil uVision ?
While in a debug mode; I tried to set up ...
0
votes
3answers
88 views
Can't identify HT74 Texas Instruments smd chip
I'm trying to find a replacement for this burned out chip, but I'm bit confused which one do I need. Thisi how it looks like:
According to this datasheet, there are several HT74 chips in SSOP and ...
0
votes
0answers
63 views
TI TM4C1294 UART on Port C problem renders the board un-programmable
In the aforementioned board, port C is 8 pins in which 0-3 are used for JTAG (So 4-7 should be GPIO available right?). I am using the following code:
...
1
vote
0answers
88 views
MCU wakes up from sleep periodically
I'm facing a weird behavior on SOME boards based upon CC3220SF.
Scenario
I have 20 units of my custom PCB, designed following the Design Reference Guidelines from Texas Instruments and - like they ...
1
vote
0answers
44 views
Power sequencing with LDO without enable pin
What is the right way to provide a power sequence using LDO (or any other power source) without the enable pin?
I'm using DAC7718 from Texas Instruments and it require a quit complex power sequencing:...
1
vote
1answer
70 views
Unknown TI microcontroller identification
80-pin QFP package, has JTAG, UART, connected LCD. Powered by 3V Li battery.
Package marking: 80AGL 10A2K.
Can't find anything similar on TI's site and google.
2
votes
1answer
72 views
LM3466 circuit symbols, SEN/SRC to ground?
I'm reading the LM3466 datasheet (page 9) and am confused about the symbol downstream of the SEN/SRC pins and R(sen). Is this a ground symbol? If so, why do they use multiple different ground symbols ...
0
votes
0answers
19 views
External Device Interfacing With AM1705 And Storing RAMDISK File
I made a custom board which runs on the AM1705 processor. so far everything works fine. the only issues I'm getting are regarding external interfacing like UART, ETHERNET, and SD-CARD at OS level.
I'm ...
1
vote
0answers
114 views
Problem with ATmega328P when used with DRV8302 gate driver
I am developing a motor controller for a 48V BLDC motor. For this, I am using the ATmega328P microcontroller in combination with the DRV8302 gate driver from Texas Instruments. It uses a simple ...
1
vote
1answer
92 views
Distinguish between hardware or firmware issue
I'm writing a firmware for CC3220SF from TI using a custom board I've designed. I'm facing a weird behavior and I'm not sure if it's hardware or firmware related.
Here I'm looking for some hints ...
0
votes
0answers
35 views
CC3220SF: manually connect to AP
I'm using this function to manually connect to an AP, using TI's C Compiler, without any RTOS:
...
0
votes
0answers
62 views
High/low order of the 4 select inputs of a 16-to-1 SN74150 MUX
I'm looking at a Texas Instrument Data sheet for an SN74150 16-to-1 MUX but I can't find which of the select inputs (A, B, C, D) is the higher order and which is the lower order. Does anyone know ...
0
votes
1answer
87 views
TI SN65HVD75 RS485 is not working while transmitting
Now I am doing a project with TI SN65HVD75 RS485 and nrf52832.
The project is converting RS485 to ...
0
votes
0answers
15 views
CC3220SF generate AP but doesn't connect to networks
I'm puzzling over a behavior I cannot explain. I designed a carrier board for CC3220SF following the reference design by TI, especially for power supply and RF section:
http://www.ti.com/tool/...
0
votes
1answer
64 views
How to select the model selector for TI IBIS model of DRA725?
Following is the IBIS model selector section for the DRA725 SoC in IBIS file.
Currently, I do SI analysis of DRA725 with Mentor HyperLynx SI, Intention is to select the right model selector. What to ...
1
vote
1answer
137 views
LMR62421 Boost converter output voltage drops periodically
I have tried to build a boost converter using a LMR62421 from Texas Instruments to get 21V at the output from a 3.3V input. To do so I used its datasheet (link above) but also I used the Texas ...
-1
votes
1answer
76 views
Difference between SN75451 and conventional gate?
I use a board where the designers uses a SN75451 chip. It is a dual AND gate chip with open collector output.
I am quite surprised as normally the 74xx09 would be used in order to implement AND gate ...
0
votes
0answers
52 views
UART Port on the TM4C1294 Board sends garbage
I am using the TI TM4C1294XL board's virtual COM port that comes on the ICDI interface. This is the code I am using:
...
0
votes
1answer
67 views
TI TM4C1294XL Programming Issue
I am working on a TI's TM4C1294XL LaunchPad with KEIL and I had a problem at the begining. I installed all the drivers for both USB and KEIL then I succesfully upload TI's blinky example to board it ...
0
votes
1answer
115 views
Interfacing 20x4 character LCD with TI TM4C1294 generates some random characters
I have a 20x4 character LCD connected to my TI TM4C1294 kit as follows:
Data bus to port A.
RS, RW and E pins to port L 0-2
I wrote this code in order to drive it:
...
5
votes
2answers
459 views
Frequency response of dual vs single op amp: OPA2890 vs OPA890
I am looking for an op amp to use as a unity gain buffer with a disable feature. The OPAx890 looks like a good candidate because it is unity gain stable.
I have noticed that some op amps labeled as ...
0
votes
1answer
115 views
Is AD8232 good for P wave, T wave, and QRS complexity analysis?
I am trying to do ECG signal analysis using AD8232.
Would it be suitable to get P wave, T wave, and QRS complexity analysis?
I will be using arduino and so 10 bit ADC. People use ADS1115 or so. ...
-1
votes
2answers
218 views
BLDC works on constant current, not on constant voltage
I'm trying to controll a 3-phase brushless DC motor (24V, 4000rpm) with the BOOSTXL-DRV8301 shield for Texas Instruments launchpad. The motor receives one of the following singals on each port (A, B ...
1
vote
1answer
257 views
I2C Write Operation on TCA9539
I am using TI's TCA9539 for some read and write I2C operation to control some signals on my test board (school project).
Per TI, the write operation comprises of the following,
"To write on the I2C ...
0
votes
2answers
141 views
I2C - Certain Slaves not Pulling the Lines down fully
I have a large number of boards deployed with a TI CC3200 microcontroller and a variety of sensors for an industrial monitoring application. I have been having an issue for some time now, on some of ...
1
vote
1answer
166 views
MSP430F169 BSL NAK (0xA0)
I have an MSP430F169 that I'm trying to program using the BSL protocol. I don't have a JTAG programmer. Unfortunately, the MSP430F169 responds with NAK (A0) even to the unprotected commands (except ...
0
votes
0answers
46 views
Error in Tiva C launchpad Schematic
I think I found and error in the schematic diagram for the Tiva C board . I was looking at switch 3 (SW 3) and I think the pin numbers are flipped. The switch is a C&K DPDT sliding maintained ...
10
votes
1answer
3k views
Why include a small resistance between op-amp stages
I have been reading through TI's reference material on constructing a current source.
http://www.ti.com/lit/an/sboa046/sboa046.pdf
In figure 52 there is a 150ohm resistor included between the output ...
0
votes
0answers
102 views
Can I debug a TM4C123GH6PM using the ICDI from a EK-LM4F120XL launchpad?
I'm trying to use the ICDI from the launchpad to flash/debug another board using the JTAG pins.
Assuming the electrical connections to the target board are fine, is the EK-LM4F120XL launchpad able to ...
0
votes
2answers
283 views
CORTEX_M4_0: Error connecting to the target: Frequency is out of range [closed]
I tried to burn my coding into the board TM4C123GH6PM using Code Composer v7 (Fedora Linux), it keep showing this error message: "Stellaris In-Circuit Debug Interface /Cortex_M4_0 Error connecting to ...
0
votes
2answers
275 views
Avoid I2C Clock stretching
I'm trying to read the temperature of a Si7050 using a TI CC3220SF. I'm not sure if clock stretching is handled correctly from the TI's driver as well as the NACK option (alternative to clock ...
1
vote
0answers
56 views
Is there any delay function in CCS v6 for C5515 DSP EVM?
I have a C5515 DSP EVM, and I want to implement a delay function. I've seen one code which had (asm" nop";) line for the delay. But it gives an error saying that the CPU is not compatible.
Please ...
2
votes
5answers
663 views
Choose a microcontroller [closed]
I plan to use a microcontroller on my project. But I don't know which one should I use. I know the features the microcontroller will need to have but many manufacturers can fit my need.
Should I ...
