MCP4461 with pic18f4550

[lats]

Dear frnz
i am designing a project using mcp4461 and pic18f4550. i am not able to understand that in mcp4461 what to do with pin 14 and 15 which are RESET and WR . can anybody help me out with the code also.
thankyou

 

[wp100]

Hi,

According to the datasheet those pins have weak pull ups.

The Reset, pulled Low, can be performed from the Pic when needed, see the datasheet for details, otherwise its left High.

The WP is Write Protect, again you can control it from the Pic or just left High to allow continuous write enabled.

 

[lats]

Thanks for replying I tried interfacing the chip I did the following basic code but no success.

	void ByteWrite(unsigned char Device, unsigned char address,unsigned char data);


#define		DIGIPOT	0x58

	ByteWrite(DIGIPOT, (0x04<<4)|0x01, 0xF0);//to select Resistor 1 only
	ByteWrite(DIGIPOT, (0x03<<4)|0x00, 0x80);//to select mid position of wiper 1

When I try to measure resistance between pin 8 & Pin 10 of (MCP4461 - 100 TSSOP 20-Pin) I get unstable values from 29k to 52k.

Please help me out , bit urgent



With best Regards.