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| Search found 26 matches |
| Author | Message |
|---|---|
 Topic: I²C / SMBUS |
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| prixsecco Replies: 4 Views: 6486 |
 Forum: General CCS C Discussion Posted: Tue Jun 12, 2012 3:47 am Subject: I²C / SMBUS |
Thank you  |
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| Topic: I²C / SMBUS |
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| prixsecco Replies: 4 Views: 6486 |
Forum: General CCS C Discussion Posted: Tue May 29, 2012 1:47 pm Subject: I²C / SMBUS |
| Should be a general question, although the link:
http://www.ti.com/lit/an/sloa132/sloa132.pdf |
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| Topic: I²C / SMBUS |
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| prixsecco Replies: 4 Views: 6486 |
Forum: General CCS C Discussion Posted: Tue May 29, 2012 1:15 pm Subject: I²C / SMBUS |
| Hello,
I've a short question: I was looking for differences of the I²C and SMBUS Specification and there I was confused with the fixed and dependent I²C-Bus levels. (like I²C fixed: Vih: 3.0V; I ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Wed Feb 01, 2012 10:49 am Subject: Melexis 90615 connection problem |
| Hey again.
I checked the bus using an oscilloscope. there i can see that the SDA line is just about 0.5V high. The problem is the pic expects Vih of 2V, right? what can i do? using a low power vers ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Sat Jan 28, 2012 1:44 am Subject: Melexis 90615 connection problem |
| I am happy for any help. Doesn't matter when...
Thanks to all in the mean time. I tried another i2c sensor and there the ack test program is working fine... Found 1 chip etc. |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 4:47 pm Subject: Melexis 90615 connection problem |
| The ACK test program I'm using:
#include <18f4550.h> #fuses hs #use delay(crystal = 20000000) #use i2c(master, SCL=PIN_b1, SDA=PIN_b0) #use rs232(baud=9600, xmit=PIN_C6, ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 4:32 pm Subject: Melexis 90615 connection problem |
| Ok the PIC can't work with 3.3V. I haven't got the LF version.
I changed power supply to +5V and used a Zener diode to regulate the VDD voltage for the sensor to +3.3 V. But i get the same resul ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 3:44 pm Subject: Melexis 90615 connection problem |
| PIC18F4550
Have i understand it right, 3.5 volts is the minimum supply voltage for the PIC18F4550 or does it mean the input level on pins have to be at a minimum of 3.5V ? |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 3:24 pm Subject: Melexis 90615 connection problem |
| According the the 18F4550 data sheet, in the Electrical Specifications
section, the "F" version of the PIC requires a minimum Vdd voltage of 4.2v. It's possible that it will work at 3.3v f ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 3:17 pm Subject: Melexis 90615 connection problem |
| [quote](I will try it with another board, just a moment...)[/qoute]
Also with another evaluationboard (PIC18F4550), 112 chips found. :-( |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 3:06 pm Subject: Melexis 90615 connection problem |
| The ACK Test program is just modified in the pin settings for SCL and SDA.
A Hardware problem of the PIC evaluation board? Or the connection from the sensor to the board? (I will try it with anoth ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 2:29 pm Subject: Melexis 90615 connection problem |
| Okey here's the result from the scan:
Start: ACK addr: 10 ACK addr: 12 ACK addr: 14 ACK addr: 16 ACK addr: 18 ACK addr: 1A ACK addr: 1C ACK addr: 1E ACK addr&# ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Fri Jan 27, 2012 11:44 am Subject: Melexis 90615 connection problem |
| Sorry.
I've done like you said. All values are "0" (TempMSB,TempLSB,TempRAW) in both methods. Hyperterminal: OBJECT TEMPERATURE: TempLSB_obj = 0 TempMSB_obj = 0 TempRAW_obj = 0 ... |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Wed Jan 25, 2012 6:36 pm Subject: Melexis 90615 connection problem |
| No idea?
Dont know whats the problem. |
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| Topic: Melexis 90615 connection problem |
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| prixsecco Replies: 49 Views: 44571 |
Forum: General CCS C Discussion Posted: Mon Jan 23, 2012 2:47 am Subject: Melexis 90615 connection problem |
| Shouldn't the second i2c_write, i2c_write(0x26) and i2c_write(0x27)
better on address 0x06 and 0x07 ? Isn't that the address for Ta and To? Thanks... |
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