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Compiler/CC2530: Error[e46]: Undefined external "?V4" referred in AF

Part Number:CC2530

Tool/software: TI C/C++ Compiler

Hello

I am a beginer with z-stack.

When i use iar 10.10.1 buid z-stack sample. it give me some error :

Error[e46]: Undefined external "?V1" referred in AF 

Error[e46]: Undefined external "?V2" referred in AF 

.......

Error[e46]: Undefined external "?V7" referred in AF .

Can you tell me where is problem ?

Thanks.


Compiler/AM3517: Float Point Calculation Unit(VFP) Performance Question

Part Number:AM3517

Tool/software: TI C/C++ Compiler

We are using AM3517(ARM Cotex-A8) chip and running software compiled  by Sourcery GNU GCC Toolchain [ gcc version 4.4.1 (Sourcery G++ Lite 2010q1-202), arm-none-linux-gnueabi-gcc] .

We do some comparison tests to to check VFP module performance, in our test doing some calculation(such as sin,cos, tan, sqrt, matrix multiple etc), I see the calculation perormance of using compiling option( -mfpu=vfp, -mfloat-abi=softfp,  enabled VFP module) is about twice times than compiling option(-mfloat-abi=soft,  disabled VFP module) ,  So my questiion is :

1)  Is the above test result  reasonable?  OR How many times should be reasonable?

2)  Besides we also want to know the performance difference between using compling option( -mfpu=vfp, -mfloat-abi=softfp) and option( -mfpu=vfp, -mfloat-abi=hard).  But we can't running software compiled using option (-mfpu=vfp, -mfloat-abi=hard),  whether option(-mfloat-abi=hard) is much better than option(-mfloat-abi=softfp) ?

3) Where can i get a suitable toolchain to compile software and compiling option (-mfloat-abi=hard)  can be enabled?  we also tried to use CCS V7 toolchain to build software, but I can't running software on our board :(

 

Could someone give me some support or suggestion for abvoe questions?  Thanks a lot in advance.

 

 

TPS7B63-Q1: Watcthdog time of TPS7B63-Q1

Part Number:TPS7B63-Q1

Hi

I have two questions about TPS7B63-Q1.
1.
Does the Vrosc accuracy influence the watchdog time tolerance?
 
2.
What the influence the watchdog tolerance in table1 comprehend?
Best regards,
Yokota

TPS65311-Q1: VREG FET operation

TL974-Q1: Thermal information, Psi-JT and Theta-JC

Part Number:TL974-Q1

Our customer has a question about thermal information.
I'm posting the question for the customer.

TL972-Q1 and TL974-Q1.
In current datasheet, only Theta-JA has been shown for each package.

Could you let me know Psi-JT and Theta-JC both for the following devices?

TL972QDRQ1 (SOIC-8pin)
TL972QPWRQ1 (TSSOP-8pin)

TL974QPWRQ1 (TSSOP-14pin)

Thank you in advance.

Best regards,
Takishin

DRV2605L: will not drive ERM without adding a resistor, but OC_DETECT bit is not set

Part Number:DRV2605L

I have an ERM that when connected directly to the DRV2605L I get no output. The armature resistance of the ERM is 26.7 Ohm, which is well above the minimum 4 Ohm impedance specified in the datasheet. If I add a 2.2 Ohm or greater resistor in series with the ERM it works as expected. With resistor values smaller than 2.2 I get no output. I've checked the OC_DETECT bit in the status register and it is not set, but it seems clear that the DRV2605L is disabling the output based on the resistance it sees.

Is it possible for the device to disable output without setting the OC_DETECT bit? Is there anyway to disable the overcurrent protection?

LAUNCHXL-CC1310: Probe software update and crash

ADS1120QPWRQ1-Leakage Current

In the actual application, we found that there will be leakage flow in ADS1120QPWRQ1, which does not find a clear scope in the manual. Can you help to provide the scope of leakage flow?

When open, the leakage flow is about how many uA;

When closed, the leakage flow is about how many uA;

Thank you very much!


LED Drivers

Hi I am satya.I am new to the forum. I am working on a project led drivers

After going through different ICs i zeroed on TI webench tool and TI ics which broadly support my requirements

The requirement is for different led drivers are

1) 24V input and different power capabilities

2) output voltage requirements are 54v, 60v, 72v and 120v 

I am having difficulty in finalizing the ic's.

What i am looking

a)if possible to have single ic or at the most 2 ics for my requirements

b) low bom cost

c) commonality of the components should be maximized.

Can somebody help me to finalize the ICs , as i work through to finish.

I have market requirement of the order of thousands per annuam 

Thanks

Chowdary

RTOS/AM3352: AM335 RTOS UDP/TCP Example code?

Part Number:AM3352

Tool/software:TI-RTOS

Hi Champs:

I'm looking for a TCP/UDP example code on TI AM335 RTOS.

Any one can share some valuable information?

Do I need to port the UDP/TCP stuffs based on this example ==> EMAC_BasicExample_evmAM335x_armExampleproject

BR Rio

THS788: THS788/THS789 replace parts

Part Number:THS788

Hi,

Due to THS788/THS789 are NRND , have others TI parts can suggest in new design.

Warm Regards,

Kevin Lin

LM5050-1: LM5050-1 : Why we need to clamp Vsd at 22mV when current is low?

Part Number:LM5050-1

Dear expert,

My customer has a question on LM5050-1. When load current is low, LM5050-1 will clamp Vsd on 22mV. Do we have a reason that LM5050-1 will clamp Vsd=22mV when load current is low? Thanks a lot!!

Best regards,

Ann Lien

LM49370: Asking for the I2S to PCM solution recommendation

Linux/DLP2000: Unable to use GPIO with projector

Part Number:DLP2000

Tool/software: Linux

Hello, I am using the DLP2000 with a BeagleBone Black running Debian 9.3 2018-01-28 4GB SD LXQT. I am new to Linux and BeagleBone and I am having an issue with configuring GPIO ports when the DLP2000 is connected. If I don't have it connected I can use GPIO 10 as an input but when I have the projector connected to the BBB I am unable to use any port as an input and instead receive the error message "ValueError: Set gpio mode failed, missing file or invalid permissions." I am able to set GPIO 10 as output in both cases.

The code I am using is the following:

import Adafruit_BBIO.GPIO as GPIO
import time

GPIO.setup("P8_10", GPIO.IN)

old_switch_state = 0

while True:
new_switch_state = GPIO.input("P8_10")
if new_switch_state == 1 and old_switch_state == 0 :
print('Do not press this button again!')
time.sleep(0.1)
old_switch_state = new_switch_state

TPS23757: DT resistor

Part Number:TPS23757

Hi,

We got a question from the customer about TPS23757.
Could you help us?

[Question]
- How much is the maximum and minimum recommended value of DT resistor?

Best Regards,
tateo


TS3V330: I2S signals 1:2 mux/demux

Part Number:TS3V330

Hi,

We have TS3V330 that can be used for I2S signal 1:2 mux/demux.

Do we have 8bits part 1:2 mux/demux that support I2S signals? I saw SN74CBTL1692 where max BW is 200MHz.

Please advise.

Thanks.

Best regards,

Gim Song

Battery Management System for 20 cells

I would like to know which is the most feasible board that can be used to monitor 20 lithium pouch cells. I require passive balancing and protection.

the output of REF3225 IS 2.52 or 2.6v

Compiler/LMK04828: I assembled a card named TIDA-01021 which TI not saled for test the chip of lmk04828 and lmx2594 how to sync between boards,but I find the board used a chip FT232HI ,we can't connect the board to the board,how to use the FT232HI?

Part Number:LMK04828

Tool/software: TI C/C++ Compiler

I  assembled a card named TIDA-01021 which TI not saled for test the chip of lmk04828 and lmx2594 how to sync between boards,but I find the board used a chip FT232HI ,we use the soft HSDC TID to connect the board ,but we find we can't connect them。How to use the FT232HI ?

LM5140-Q1: Components of EVM

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