Part Number:TMS570LS1224
Hi, there. When I change baudrate at Halcogen, Halcogen should change spiREGx -> FMTx 's PRESCALE bit. however, I see the driver source code always remain 79U in spiInit(), is that a bug or something else? Thanks.
↧
TMS570LS1224: The HalCoGen have not changed the SPI baudrate, is it a BUG?
↧
BQ21040: Device behavior when battery is not available
Part Number:BQ21040
Hi Bill
Now we are facing this in most of devices almost 80 % of 50 prototypes we made now we have run PPR of 1000 devices and cannot able to finalize this part. Here is problem is we are facing
Battery used capacity: 90 mAh
Iset : 50 mAh
During operation suppose someones didn't charge devices for 7 days out battery discharges completely on battery low voltage cut off circuit activates and when we plug in charger device didn't wakes up. we observe 1.6/1.8 V on Vbat pin.
Please let me know the following
1) How charger IC detects battery presence?
2) I Can't see any low frequency pulsating DC voltage to detect battery on the device? why?
Following are observations in which devices wake up ?
1) If i apply a pulse of 5V on Vbat pin ie +Ve input of battery . why?
2)If i increase the Iset current to 100mA which i can't do due to low capacity of battery.why ?
3) If I put voltage divider circuit on LDO (ie load) CE pin so that it dont gets on till Vbat reaches 3V. why?
↧
↧
TMS320C6748: use of HSEN in USB 2.0 peripheral
Part Number:TMS320C6748
we are having some issues with enumeration.
we are using drivers_c674x_c6748 from C6748_StarterWare_1_20_02_02 so the code is something of a black hole.
in our research we found that setting CFGCHIP2 (0x01e04184) in SYSCFG seems to automatically set HSEN in the USB 2.0 peripheral POWER register (0x01c00401).
but we cannot find a description of this process. can anyone shed any light on how all of this is supposed to work? and is there documentation?
here is the code:
void UsbPhyOn()
{
unsigned int reg = 0;
reg = HWREG(CFGCHIP2_USBPHYCTRL);
reg &= ~(CFGCHIP2_RESET | CFGCHIP2_OTGMODE | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);
HWREG(CFGCHIP2_USBPHYCTRL) = reg;
reg |= (CFGCHIP2_DATPOL | CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN);
HWREG(CFGCHIP2_USBPHYCTRL) = reg;
reg |= (CFGCHIP2_USB2PHYCLKMUX | CFGCHIP2_REFFREQ_24MHZ);
HWREG(CFGCHIP2_USBPHYCTRL) = reg; =================> POWER[HSEN] is set after this statement
reg |= (CFGCHIP2_PHY_PLLON);
while (!(HWREG(CFGCHIP2_USBPHYCTRL) & CFGCHIP2_PHYCLKGD));
}
↧
BQ21040: Device behavior when battery is not available
Part Number:BQ21040
Hi Team
We are using BQ21040DV in STBI_SSTD to charge 100mAH battery.
Following are my configurations details
1) Iset = 50mA
2) Load current at the time of booting = 15mA (max )
3)Sleep current=60 uAmp
Now Suppose my devices discharge over time. At 3V it gets cut off due to battery low voltage cut off circuitt
If I am plugging charger devices does boot up, we observed that charger output is getting stuck at 1.6 V hence it can't able to power up the device and charge the battery even after 3-4 hours.
As per my understanding following is a concern
Iset =50mA (ie .5 C) precharge current is 10%Iset = 5mA . Since load current is above the precharge current it can't able to supply device required current to load and detect the battery.
Please confirm me following
1) Since battery inbuilt, low voltage cut off circuit is activated how the device will detect that battery is present?
2) If the device detects that battery is not present (due to activation of low voltage cut of the circuit )What should be output voltage and output current (precharge/Iset)
3) If I disconnect the load it works. why?
4) If I apply a 5V voltage pulse on battery pack it works .why?
5) If increasing capacitor on Vout of the charger will help?
6)If we cannot able to solve this with the part please suggest us a drop-in replacement if possible as we have to release order of 1K pre-production run which is scheduled at end of June
↧
ADS5263: Part Used In Rev B EVM Board
Part Number:ADS5263
My customer has the following question:
I bought an EVM board for the chip and found the sampling noise to be very low. I decided to duplicate exactly the EVM board's input circuit on the second rev of my board. However, there's a problem with a part on the EVM board: the datasheet calls out a certain ferrite bead for the input circuit (Panasonic EXC-ML32A680U). This part is obsolete and unavailable, but that's not the problem; Arrow lists an equivalent. The problem is: the Panasonic part is a 1206 package size, but the actual part on the board looks like it's roughly 0603 size, so it can't be the Panasonic part. I attached a picture of the eval boad - L30 and L31 are clearly about the same size as R59 and R60, and those resistors are obviously 0603 size (and are called out as such in the bill of materials).
What was the actual part used on the board?
Thanks for your help with this!
Richard Elmquist
↧
↧
SN74LVC1G66: Is there a part like this one with negative logic?
Part Number:SN74LVC1G66
Looking for a part with everything the same of the SN74LVC1G66 but with negative logic. Does such a part exist?
Best regards,
Michael Norcia
↧
TMS320F28035: Question about CPU and CLA try to access 'cla_to_cpu message RAM' at the same time issue
Part Number:TMS320F28035
Hi,
I was wondering what happens if CPU and CLA are trying to access 'CLA to CPU Message RAM' at the same time. From the CLA data sheet, it says 'CLA write' has higher priority than 'CPU reads'.
Questions:
1. Does it mean 'CPU reads' request is ignored or 'CPU reads' will still happen but only after 'CLA write'?
2. If 'CPU_reads' occured slightly earlier than 'CLA write', how would 'CPU reads' be interrupted by 'CLA write'?
Thanks.
↧
TRS3122E: High Common Mode Noise Immunity Configuration for TRS3122E
Part Number:TRS3122E
We encounter communication problem when we connected two TRS3122E together. One TRS3122E is on the uC board and another TRS3122 is 28" away on the communication hub. They are connected via a RJ45 cable.
The communication hub side is close to metal chassis and the common mode noise is injected into ground of the uC and the metal chassis up to 1000V p-p sine waveform.
I am try to find way to increase the noise immunity and please comment on the following questions:
1. We supply Vcc with 3.3V now. Is it better to use 5V supply?
2. For capacitor selection with Vcc = 3.3V, we currently use 100nF for all C1 - C5, is it better to use C1 = 47nF, C2 = 470nF, C3 = 100nF, C4=C5=470nF,
3. Is it better to use 4.7uF Cbypas for Vcc and Vl than 0.1uF for noise immunity?
4. For all test in done at Rload = 3kOhm, and the datasheet shows receiver input resistance in 5kOhm, is that means we can add another Rload in parallel with 5kOhm to 3kOhm to increase the current? Or
If you can think of any ways to improve the noise immunity of configuring the TRS3122E, we appreciate your comments.
Thank you very much,
Frank W
↧
CCS/TMS320F28379D: Multiple instance of the signal generation module - 28379D
Part Number:TMS320F28379D
Tool/software: Code Composer Studio
Hi,
I am trying to produce multiple instances of the signal generation module. However, as i see in the SG material, the settings for all the signal generation (SIN one ) are all the same: for example, sgen. freq sgen.gain. they are all the same. The code fragment is provided below:
SGENT_1 sgen = SGENT_1_DEFAULTS; //
sgen.freq=8590; // 80Hz signal
sgen.step_max=1000; // Max Freq= 302.57 Hz
sgen.alpha=0; // no phase shift
sgen.gain=0x3fff; // 0x3FFF is 0.5 0x7FFF is 1 Q15
sgen.offset=0; // No dc offset
sgen.calc(&sgen);
The output will be sgen.out
If i am try to produce two instance, each SIN signal generated with different frequency and amplitude, how can i do that? Thank you very much for helping me.
min
↧
↧
BQ25895: Input current on VBUS
Part Number:BQ25895
On page 7 of the datasheet, for the parameter I(VBUS_HIZ), the stated test condition is "High-Z mode, no battery, battery monitor disabled"
Is that a typo? How can the IC be in Hi-Z mode without a battery attached? If no typo, is the I2C functional with no battery and High-Z mode enabled ?
↧
DS90UB913A-Q1: how to exercise flow control with different clock for camera sensor than the serializer
Part Number:DS90UB913A-Q1
Below is the data link for our set up
megapixel sensor -> fpga -> DS90UB913 serializer -> DS90UB934 deserializer -> TDA2x
The sensor runs at a different clock than the serializer. What is the mechanism in the serializer for the fpga to possibly exercise flow control of the sensor data?
Can we use the HSYNC and VSYNC signals in the serializer for flow control? If yes, are there timing diagrams to demonstrate the use of HSYNC and VSYNC for this purpose?
Thanks.
↧
LMX2571: LMX2571 Lock Problem
Part Number:LMX2571
I'm unable to get my EVK to lock on a custom frequency- screen shot below. I'm looking for guidance to set the loop filter characteristics- where can I look? I've seen in other posts a Bode plot tool, but none seems to be available in code loader 4.
Thank you!
↧
TMS320F28035: CLA TO CPU Message RAM access issue
Part Number:TMS320F28035
I was wondering what happens if CPU and CLA are trying to access 'CLA to CPU Message RAM' at the same time. From the CLA data sheet, it says 'CLA write' has higher priority than 'CPU reads'.
1. Does it mean 'CPU reads' request is ignored or 'CPU reads' will still happen but only after 'CLA write'?
2. If 'CPU_reads' occured slightly earlier than 'CLA write', how would 'CPU reads' be interrupted by 'CLA write'?
↧
↧
AM5708: operating am5708 at 110C
Part Number:AM5708
Hi,
My customer is using AM5708 and have the industrial temperature limit (105 degrees core temperature) as limit in our DTB file. Above this limit the thermal module will give a critical warning and issues a reboot in linux. The PoH life span mentioned in the datasheet well enough at 105 degrees.
Customer is considering to extend operation from 105 degrees to 110 degrees.
Do we also have lifetime figures of junction temperatures of 110 degrees Celsius?
Thanks!
Best regards, Patrick
↧
TINA/Spice/SN74AUP1G14: TINA-TI Spice Model Available?
Part Number:SN74AUP1G14
Tool/software:TINA-TI or Spice Models
Hi,
Is there a TINA-TI Spice Model for the SN74AUP1G14? It'd be great if there were TINA-TI models for all of the Tiny Logic family, but I'm mostly interested in the SN74AUP1G14 at the moment.
Regards,
Jeremy
↧
LMZ31520: power-good functionality in the Forced Continuous Conduction Mode
Part Number:LMZ31520
Hi!
Help me please with one question on LMZ31520.
Is it still possible to have power-good functionality on the PWRGD pin while using Forced Continuous Conduction Mode? I.e., is it correct to have the PWRGD pin pulled up to V5V pin with a 4.7kOhm resistor and the SS_SEL pin connected to the PWRGD pin (for the FCCM) through a 160kOhm resistor (to have 2.8 ms Slow-Start Time)?
Best regards, Vic.
↧
CD74HC4051: The crosstalk of 74HC4051
Part Number:CD74HC4051
I've been asked to determine whether the TI cd54hct4051 can be used as an alternate for the Onsemi mc74hc4051adtr2g or mc74hc4051adtg. The ordering information has been removed from the latest datasheet but on http://www.mouser.com/ds/2/405/schs122j-127271.pdf the cd54 suffix indicates CERDIP wilt the Onsemi part is a tssop plastic case so this appears to be a typo. HC indicates operational control voltage 2-6V while HCT is 4.5-5.5V. The thread this one is based on refers to a crosstalk issue. When I compared datasheets I noticed the Onsemi part specifies the crosstalk between any two switches under a defined test condition but says the test doesn't apply to HC4051A. The TI datasheet doesn't specify crosstalk. I also noticed the Onsemi part lists a maximum on resistance of 100 ohms while the TI part is 130 ohms and the current leakage is higher (400nA) on the TI part compared to Onsemi (200nA). Was the previous crosstalk thread resolved to the satisfaction of the originator? Does TI have a part comparable to the Onsemi parts I've listed with respect to these parameters?
↧
↧
TMS320F28069M: Max. possible RPM with a 4 Pole BLDC motor
Part Number:TMS320F28069M
Hi,
Wondering what is the maximum possible achievable motor spindle RPM that's possible with the F28069M running at the default 90MHz.
Any thoughts ? How to find out this figure ?
Thanks,
Manu
↧
BQ21040: Set the Current Limit
Part Number:BQ21040
HI team
In the flow chart for power up it is wrritten that " Set the Current Limit to 100 mA and Start Charge Perform ISET & OUT short tests"Please confirm if it is 10mA or 100mA.
↧
IWR1642BOOST: AR-DEVpack driver for ti mmwave dev pack,driver install
Part Number:IWR1642BOOST
ti iwr1642 eval bd drivers for will not install. I have the location correct. Device manager says A problem was encountered adding the driver to the store
I believe I am point to the right location.
↧