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Interface and Isolation
Interface and Isolation
Documents ADuM6402 VDDL input pin connection
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  • INTERFACE AND ISOLATION SUPPORT COMMUNITY
  • Tags List (Interface & Isolation)
  • +General: FAQ
  • +AD5700: FAQ
  • ADG324x: FAQ
  • +ADM2687: FAQ
  • +ADN4695E: FAQ
  • ADuM1100: FAQ
  • +ADUM1200: FAQ
  • ADuM1201: FAQ
  • +ADuM1230: FAQ
  • +ADuM1250: FAQ
  • ADuM1251: FAQ
  • +ADUM1300: FAQ
  • ADuM1301: FAQ
  • +ADUM1400: FAQ
  • +ADUM1401: FAQ
  • +ADuM1402: FAQ
  • ADuM1420: FAQ
  • +ADuM1440: FAQ
  • ADuM1441: FAQ
  • +ADuM144x: FAQ
  • +ADuM2400: FAQ
  • ADuM2401: FAQ
  • ADuM2402: FAQ
  • +ADUM3070: FAQ
  • +ADuM3160: FAQ
  • +ADuM3190: FAQ
  • ADuM3201: FAQ
  • ADuM3220: FAQ
  • ADuM3221: FAQ
  • ADuM3223: FAQ
  • ADuM3440: FAQ
  • ADuM3470: FAQ
  • ADuM3471: FAQ
  • ADuM3480: FAQ
  • ADuM3482: FAQ
  • +ADuM4160: FAQ
  • +ADuM4190: FAQ
  • +ADuM4223: FAQ
  • ADuM4400: FAQ
  • ADuM4472: FAQ
  • +ADuM5000: FAQ
  • +ADUM5010: FAQ
  • ADuM5201: FAQ
  • ADuM5202: FAQ
  • +ADuM5230: FAQ
  • +ADuM5241: FAQ
  • ADuM5400: FAQ
  • ADuM5401: FAQ
  • ADuM5402: FAQ
  • ADuM5403: FAQ
  • ADuM6000: FAQ
  • ADuM6132: FAQ
  • +ADuM620X: FAQ
  • ADuM6400: FAQ
  • ADuM6401: FAQ
  • ADuM6402: FAQ
  • ADuM7234: FAQ
  • +EVAL-CN0313: FAQ
  • +isoPower: FAQ
  • +MLVDS: FAQ
  • +SPIsolator: FAQ
  • +3B01: FAQ
  • +AC1307: FAQ
  • +AD202: FAQ
  • +AD2S75: FAQ
  • +AD5700-1: FAQ
  • +ADBMS6821: FAQ
  • +ADM202: FAQ
  • +ADM202E: FAQ
  • +ADM206: FAQ
  • +ADM2481: FAQ
  • +ADM2483: FAQ
  • +ADM2484E: FAQ
  • +ADM2486: FAQ
  • +ADM2582E: FAQ
  • +ADM2587E: FAQ
  • +ADM2682E: FAQ
  • +ADM2687E: FAQ
  • +ADM3052: FAQ
  • +ADM3053: FAQ
  • +ADM3054: FAQ
  • +ADM3074E: FAQ
  • +ADM3075E: FAQ
  • +ADM3202: FAQ
  • +ADM3251E: FAQ
  • +ADM3252E: FAQ
  • +ADM3260: FAQ
  • +ADM3483: FAQ
  • +ADM3485E: FAQ
  • +ADM3491: FAQ
  • +ADM483E: FAQ
  • +ADM4852: FAQ
  • +ADM485: FAQ
  • +ADN4650: FAQ
  • +ADN4651: FAQ
  • +ADN4690E: FAQ
  • +ADP5585: FAQ
  • +ADP5588: FAQ
  • +ADP5589: FAQ
  • ADuM for >2kV voltage
  • ADuM1100 glitch filter window vs. very narrow pulses
  • +ADUM1100: Different supply voltage
  • +ADUM1201 suitable to work in CAN Bus?
  • ADuM1250 detect levels scale with the supply
  • ADuM1250 failure in hot-swapping application
  • ADuM1250 Side1 minimum levels
  • ADuM1250: tips to reduce power consumtion in a battery application.
  • ADuM1251 max permitted voltage for IEC 61010 reinforced
  • ADuM1251: Flash testing limits
  • ADuM1251: Vol issues with non standard I2C applications
  • ADuM1301 Output current capability
  • ADuM1301: Default output state on power up
  • ADuM1402: Is there any specified or typical jitter performance?
  • ADuM1402: Can it be modified to same configuration as the I2C isolator ADUM1250 ?
  • AduM1402: Tristate outputs
  • +ADUM1402BRWZ: FAQ
  • +ADUM140D: FAQ
  • ADuM1420: Maximum switching frequency is given as 5Mbps in datasheet, should this be 5MHz?
  • +ADUM2250: FAQ
  • ADuM2400 input current test
  • ADuM2400: 12 V digital signal
  • ADuM2401 driving long cable
  • ADuM2401 output driving 2m cable
  • ADUM2401: Common mode voltage
  • +ADUM241D: FAQ
  • +ADUM3160/4160: Can this device be used for USB-IF standard host isolation
  • ADuM3201 solderability
  • +ADUM3210: FAQ
  • +ADUM3211: FAQ
  • +ADUM3220: There is no Junction to Ambient thermal resistance given in datasheet
  • ADuM3223 in H-bridge
  • ADuM3223 vs ADuM3220
  • ADUM3230 at low frequency
  • ADuM3470 efficiency over temperature range
  • ADuM3470 with VDD1>VDDA
  • ADuM3470: thermal derating
  • ADuM3471
  • ADuM3480 datasheet questions/corrections
  • adum3482 optoisolator and power pin permutation query
  • +ADUM4135: FAQ
  • +ADUM4160/ADUM3160: Can these devices support OTG (On The Go) USB?
  • +ADUM4165: FAQ
  • +ADUM4221: FAQ
  • ADuM4223 for safety class II
  • ADuM4472 isolation performance for IEC 60601-1
  • ADuM5000 DC-DC shutdown
  • +ADUM5020: FAQ
  • +ADUM5028: FAQ
  • +ADUM5201: Is it possible to switch the isolated Voltage off, by setting Ve2 to low?
  • ADuM5230 no output voltage (Viso)
  • ADuM5241
  • ADuM5241 overvoltage protection
  • ADuM5241: Application hints for addressing EMC problems in order to pass CE test?
  • ADuM5241: What output impedance can we expect in Z state when Viso is unpowered?
  • ADuM5401: How do I connect PIN 7 (RCout) of ADuM5401 in a standalone application?
  • ADuM5401: Is 1 Mbps the maximum data rate, can this device be used above 1 Mbps?
  • +ADUM5401WCRW vs ADUM5401WCRWZ-1: What is the difference?
  • +ADUM5402: 5V supply disturbed by device's DC/DC converter.
  • +ADUM5403: RCOUT pin connection if not used
  • ADuM54xx and ADuM64xx: Startup Problems
  • ADUM54xx: Can I make parallel connection of devices in a redundancy configuration?
  • ADuM54xx: recommendations on how to put 2 ADUM54xx in parallel?
  • ADuM6000 and RCin/RCsel High Level thresholds
  • +ADUM6132 and capacitive loading of 10nF effect on the device
  • ADuM6400 specs changed
  • ADuM6400: PCN # 11-0188 typo error
  • ADuM6401 and common mode transient immunity
  • ADuM6402 VDDL input pin connection
  • +ADUM7234: Why is maximum output differential voltage only 350V and what happens if it is exceeded?
  • Any condition needs to be met for the state of PIO outputs to remain after 1-Wire connection is removed?
  • Can ADUM3440 be used to provide Isolation from high frequency noise?
  • Can the ADuM1250 drive a 25 metre line?
  • Can you expalin the difference in ESD protection between the ADuM240x and the ADuM440x icoupler parts?
  • CTRL Pins on ADuM3482
  • Difference between ADuM2401 v ADuM4401
  • +DS2406+: FAQ
  • +DS2406P+: FAQ
  • DS2408: FAQ
  • +DS2408S+: FAQ
  • DS2413 8" UNTSTD RAW DIE (A2) SA: FAQ
  • +DS2413P+: FAQ
  • +DS2413Q+T&R: FAQ
  • +DS8500-JND+: FAQ
  • +DS8500-KIT#: FAQ
  • +EVAL-AD5700-1EBZ: FAQ
  • EVAL-ADuM322xEBZ dimensions
  • Generating 3 Voltages with ADuM347x
  • glitch filter width of the ADuM144X family?
  • How to use DS2413 as communcation between TWS earbud & Charger-box
  • I set EN1 and EN2 high to disable the internal refresh and watchdog for lowest operating power. Is DC correctness guaranteed in this state?
  • input voltage levels are recommended?
  • Is ADuM6000 (or ADuM5000) compliant with the USB low power suspend mode current limits?
  • +LT3960: FAQ
  • +LTC4332: FAQ
  • +LTM2884: FAQ
  • +MAX12930BASA+: FAQ
  • +MAX12931: FAQ
  • +MAX13041: FAQ
  • +MAX13050: FAQ
  • +MAX13054AEASA+T: FAQ
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  • MAX22508E Data Sheet Pinout Clarification
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ADuM6402 VDDL input pin connection

Question

ADuM5402 has been replaced with ADuM6402 on PCB (due to component
availability). However, some parts work but others don't. Datasheet says VDDL
pin on ADuM6402 must be connected. What happens if this pin is left open (as in
case of ADuM5402)? Also, would be there be any difference in behavior in a
system powered by 5V or 3V with VDDL pin left open?

please advise





Document IconViso Startup Issues Rev A.pdf Type: application/pdf
Name: Viso Startup Issues Rev A.pdf
- Viso Startup Issues Rev A.pdf


Document IconViso Startup Issues Rev A.pdf Type: application/pdf
Name: Viso Startup Issues Rev A.pdf
- Viso Startup Issues Rev A.pdf

Answer

There are several things that can cause problems in the isoPower series.

We had a startup issue with the original silicon of the isoPower parts -> it
has symptoms of power either not coming up at all, or coming up to an incorrect
regulation point. The last part to switch to the new silicon was the ADum640x,
so the older silicon is still available in distribution.

The ADuM640x also split the power supply to reduce internal noise, but there
are still some internal connections which can parasitically power the data
channels from the isoPower. It is required to provide power to Pin 7 for
reliable operation of the data channels. But it may operate in an unstable mode
if the pin is left open. Bypass is important on this pin as well. A jumper wire
to pin 1 may be acceptable, if it is as short as possible and something the
gage of wire wrap wire.

There may be a difference in data channel behavior as a function of voltage,
since parasitic power tends to come in through diodes, it drops the voltage
further internally. It also probably makes a difference what the data channels
are doing, since that is another path for parasitic power.

Tags: interface and isolation adum5402 2GFV2957
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