problem in cdce706

Hi Prateek27,

1. if S1=S0= high then your calculation is right if you follow the initialization sequence given in the datasheet shown below. (note that first right is not done in that mode though, it's only used to write byte10.

3. As in datasheet, byte 3/6 both have similar bits for the 3 PLLs, each is defined as in later tables

Regards,

Ahmed

Hi Prateek

>one more thing what is the difference between i2c and SMbus coz in hardware mode both looks like same.

SMBUS is a superset of i2c protocol, so it's very similar. you can still inter-operate the two buses with some conditions. you can easily find this on the web.

>what is the mean of byte1,2 etc it is register's address or else??

Byte1= Register1 of the device configuration registers.

>we can configure any register at any time according to my use ??

Generally yes

>it is possible to interface msp430f5329 with cdce706 using smbus???

Yes

>i am trying this many times but i can't get my desired output.

You are not clear what you did exactly, what is the desired output, and what do you get. You think the device is ignoring the smbus communication? you can't for examble turn on/off some output?

here is a short description of how to address more than one device on the same bus.

To address more than one CDCE706 device on the same I2C bus, configuration inputs S0,S1 must be used. However, this is not the default function of those inputs. there are two ways to use those inputs as address inputs

1- EEPROM method: by individually programming the devices by writing Byte10[1:0]='11' (also bits [3:2] ='11' if more than two devices are needed) and initiate and EEPROM WRITE cycle. the devices then will have S0 (or S1 as well) as address input by default.

2- initialization pattern method (I take the example of two devices only): in that method, you use S1 for example to differentiate between the devices, S1 is tied high in one devices, and low in the other. first SMBUS access will reach both devices as they both have internally '01' address still. this access should be a write to Byte10[3:2]=11. just after the ACK of that access S1 usage as address is activated. subsequent access to the devices should include the proper slave address in the I2C prgroamming sequence ('11' or '01')

The only issue here is that the second one will have the outputs turned off by default (bacause by default S1 is used to turn off the outputs when Byte10[3:2]='00')

>all configuration is in picture plz consider it, if any change then suggest me.

reviewing the registers will not be useful If I'm not aware of the use case and the PLL config. this is anyway irrelevant to your problem if I understand properly. our issue is in writing to Byte 10 and getting it to be excuted properly by the device.

 

Hello Prateek,
you can use the labview GUI to create your register map. Please check scac097.
I created an example for your frequency plan Y0..Y2: 125M,50M,40M;

Offset 0x00 Data 0x11
Offset 0x01 Data 0x0C
Offset 0x02 Data 0x7D
Offset 0x03 Data 0x40
Offset 0x04 Data 0x01
Offset 0x05 Data 0x01
Offset 0x06 Data 0xE0
Offset 0x07 Data 0x01
Offset 0x08 Data 0x0A
Offset 0x09 Data 0x20
Offset 0x0A Data 0x2F
Offset 0x0B Data 0x04
Offset 0x0C Data 0x00
Offset 0x0D Data 0x02
Offset 0x0E Data 0x05
Offset 0x0F Data 0x06
Offset 0x10 Data 0x01
Offset 0x11 Data 0x01
Offset 0x12 Data 0x01
Offset 0x13 Data 0x38
Offset 0x14 Data 0x39
Offset 0x15 Data 0x3A
Offset 0x16 Data 0x33
Offset 0x17 Data 0x33
Offset 0x18 Data 0x33
Offset 0x19 Data 0x00
Offset 0x1A Data 0x1B

Best regards,
Patrick