[MOVED] Help about interfaacing of ADC CS5460 with 89c51

[dighedip@gmail.com]

My problem is, the output at seven segment display remains 0000. Means ADC will not respond to change in input parameters Or it may be not properly configured initially. Pls help me for this interfacing.
Also pls tell me if there is any cheap alternative for CS5460 .
Initially pls help me in doing this.
The program is written in C language.
Thanks in advance!

 

[mrflibble]

Re: Help about interfaacing of ADC CS5460 with 89c51

You'll probably have more luck posting this in the microcontroller section.

In general, have you put a scope or logic analyzer on the signals to check what is going on? If not, that should be your first step.

 

[jayanth.devarayanadurga]

Post your code.

- - - Updated - - -

Post your code. The IC you are using is not just ADC. It is an energy meter chip which includes ADC for Current and Voltage measurement. It measures Irms and Vrms. It gives pulse output which is proportional to energy. You can use the pulse output to calculate energy in kWh. If you want just adc then use ADC0809. If you want to use energy meter chip then use the chip you are using. In your circuit I don't see any connection to SDO pin of the Energy meter chip. It is a SPI device. After the completion of the conversion you have to write 8 bits command and read 24 bits data with a total of 32 SCLKs. Without reading the SDO line how can you get data and how can you display the data on 7 Segment display. You are not reading any data and hence your display reads 0.

If you want to use just ADC then use LTC ADC or Analog Devices ADCs. They are good. I can write a code for SPI 16 bit ADC if you want.

 

[dighedip@gmail.com]

First of all thanks for ur reply
Sir
According to my interfacing dia. the connections are as follows:
Pin P1.0: Hardware reset control(Optional as the chip has its internal software reset)
P1.1: SDI
P1.2:SCLK
P1.3 :SDO
and My code is :

---

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#include <regx55.H>
//*****DisplayFunctions*****************************************************************
void display_data(unsigned int data_N_display);
void delay(unsigned int itime);
unsigned int c=0,x=0; //initialize key counter and key flag
unsigned char array[]= {0xC0,0x79,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10};
unsigned char dig_ctl[] = {0x01,0x02,0x04,0x08} ;
//unsigned char dig_ctl[] = {0x08,0x04,0x02,0x01} ;
unsigned char digit[4];
unsigned char dig_num;
//************************************************** 
void timer0(void) interrupt 1 // timer o only for display;;
{ 
//unsigned char index;
//P0 = 0xFF;
P2 = 0x00;
//for (index=0;index<4;index++)
//{
//P2 = dig_ctl[index];
//P0 = digit[index];
//}
 
P0 = digit[dig_num];
P2 = dig_ctl[dig_num];
dig_num++;
if(dig_num >=4)
dig_num = 0;
}
//************************************************** 
void display_data(unsigned int data_N_display)
{
unsigned char temp_data;
unsigned char index;
unsigned long quotient;
unsigned char temp_digit[5];
for(index=0;index<4;index++)
{
quotient = data_N_display/10;
temp_data = data_N_display-quotient * 10;
temp_digit[index] = temp_data;
data_N_display = quotient;
}
for(index = 0;index<4;index++)
{
digit[index] = array[temp_digit[index]];
}
//for (index=0;index<4;index++)
//{
//P2 = dig_ctl[index];
//P0 = digit[index];
//}
}
//================================================== 
unsigned char ch;
long COUNT, tlong;
 
//************************************************** 
//************** CS5460********************
//sbit CS5460AResetMC=P1^3 ;
sbit CS5460ADout = P1^0;//at RC1_bit; // INPUT PIN
sbit CS5460AClk = P1^1; // at RC0_bit; // OUTPUT PIN
sbit CS5460ADin = P1^2;//at RD0_bit; // OUTPUT PIN
sbit buzzer=P2^7;
 
//************************************************** ***********
//CS5460A register addresses
//************************************************** ***********
#define CS5460A_REG_CONFIG 0x00
#define CS5460A_REG_AIN1_OFFSET 0x02
#define CS5460A_REG_AIN1_GAIN 0x04
#define CS5460A_REG_AIN2_OFFSET 0x06
#define CS5460A_REG_AIN2_GAIN 0x08
#define CS5460A_REG_CYCLE 0x0A
#define CS5460A_REG_PULSE 0x0C
#define CS5460A_REG_CURRENT 0x0E
#define CS5460A_REG_VOLT 0x12
#define CS5460A_REG_POWER 0x14
#define CS5460A_REG_ENERGY 0x16
#define CS5460A_REG_IRMS 0x18
#define CS5460A_REG_VRMS 0x1A
#define CS5460A_REG_TBC 0x1C
#define CS5460A_REG_PWR_OFFSET 0x1E
#define CS5460A_REG_STATUS 0x20
#define CS5460A_REG_IACOFFSET 0x22
#define CS5460A_REG_VACOFFSET 0x24
#define CS5460A_REG_MASK 0x34
#define CS5460A_REG_CONTROL 0x38
//************************************************** ***********
//CS5460A commands
//************************************************** ***********
#define CONVERT_CONTINOUS 0xE8
#define CONVERT_ONCE 0xE0
#define CS5460A_SYNC0 0xFE
#define CS5460A_SYNC1 0xFF
#define POWER_UP_HALT 0xA0
#define CAL_AIN1_DC_GAIN 0xCA
#define CAL_AIN1_DC_OFFSET 0xC9
#define CAL_AIN2_DC_GAIN 0xD2
#define CAL_AIN2_DC_OFFSET 0xD1
#define CS5460A_WRITE 0x40
#define CS5460A_READ 0x3E
//************************************************** ***********
//config data
//************************************************** ***********
#define CLOCK_DIVIDER 0x00000004
#define AIN1_GAIN_10 0x00000000
#define AIN1_GAIN_50 0x00010000
#define SOFT_RESET 0x00000080
#define MASK_NO_INTERRUPTS 0x00000000
#define STATUS_CLR_CRDY 0x00100000
#define STATUS_CLR_DRDY 0x00800000
#define STATUS_CLR_ALL 0x00FFFFFF
#define CONTROL_DEFAULT 0x00000000
#define CURRENT_GAIN_DEFAULT 0x00100000
#define VOLT_GAIN_DEFAULT 0x00100000
#define COMPUTATION_CYCLE 0x00000FA0
#define TIME_BASE 0x00800000
extern long CS5460ARead24Bits(char AdcRegisterAddress);
extern void CS5460AWriteCommand(char Command);
extern void CS5460AReset(void);
extern void CS5460AWrite24Bits(long RegisterData, char AdcRegisterAddress);
extern void CS5460AReset(void);
extern void CS5460APulseClock(void);
void Delay_ms(unsigned int itime);
unsigned long Va, Gain, Test, Volt ,energy;
//================================================== =========================
//================================================== =========================
//char CS5460AReadDRDYBit(void)
//{
//char ReadyBit;
//long StatusRegister;
//StatusRegister=CS5460ARead24Bits(CS5460A_REG_STATUS);
//if(StatusRegister & 0x00800000)
//{
//ReadyBit=1;
//}
//else
//{
//ReadyBit=0;
//}//get DRDY bit
//return(ReadyBit);
//}
 
//================================================== =========================
char CS5460AReadCRDYBit(void)
{
char ReadyBit;
long StatusRegister;
StatusRegister=CS5460ARead24Bits(CS5460A_REG_STATUS);
if(StatusRegister & 0x00100000)
{
ReadyBit=1;
}
else
{
ReadyBit=0;
}///get CRDY bit
return(ReadyBit);
}
//================================================== =========================
 
void CS5460AResetConfigure(void)
{
CS5460AReset();
CS5460AWrite24Bits((CLOCK_DIVIDER |AIN1_GAIN_10),CS5460A_REG_CONFIG);//Ain1
CS5460AWrite24Bits(CONTROL_DEFAULT,CS5460A_REG_CONTROL);//write default
CS5460AWrite24Bits(STATUS_CLR_ALL,CS5460A_REG_STATUS);//clear all status
CS5460AWrite24Bits(MASK_NO_INTERRUPTS,CS5460A_REG_MASK);//no interrupts
//gain is 10, clock divider is 4
CS5460AWrite24Bits(CURRENT_GAIN_DEFAULT,CS5460A_REG_AIN1_GAIN);//Ain1 gain
CS5460AWrite24Bits(VOLT_GAIN_DEFAULT,CS5460A_REG_AIN2_GAIN);//Ain2 gain
CS5460AWrite24Bits(COMPUTATION_CYCLE,CS5460A_REG_CYCLE);//rms cycle
CS5460AWrite24Bits(TIME_BASE,CS5460A_REG_TBC);//default time base
CS5460AWriteCommand(CONVERT_CONTINOUS);//start conversions
return;
}
//================================================== =========================
void CS5460AReset(void)
{
char BitCounter;
for(BitCounter=0;BitCounter<3;BitCounter++)//send 3 SYNC1 bytes
{
CS5460AWriteCommand(CS5460A_SYNC1);
}
CS5460AWriteCommand(CS5460A_SYNC0);//send 1 SYNC0 byte
CS5460AWrite24Bits(SOFT_RESET,CS5460A_REG_CONFIG);//issue soft reset
}
 
//================================================== =========================void CS5460AWriteCommand(char Command)
{
char WriteByte;
char BitCounter;
WriteByte=Command;
for(BitCounter=0;BitCounter<8;BitCounter++)
{
if(WriteByte & 0x80)
{
CS5460ADin=1;
}
else
{
CS5460ADin=0;
}
CS5460APulseClock();
WriteByte=WriteByte<<1;
}
}
//================================================== =========================
void CS5460AWrite24Bits(long RegisterData, char AdcRegisterAddress)
{
char BitCounter;
char WriteByte;
long WriteLong;
WriteLong=RegisterData;
WriteByte=(CS5460A_WRITE | AdcRegisterAddress);//write command with reg address
for(BitCounter=0;BitCounter<8;BitCounter++)//send command
{
if(WriteByte & 0x80)
{
CS5460ADin=1;
}
else{CS5460ADin=0;
}
CS5460APulseClock();
WriteByte=WriteByte<<1;
}
for(BitCounter=0;BitCounter<24;BitCounter++)//write 24 bits
{
if(WriteLong & 0x00800000)
{
CS5460ADin=1;
}
else
{
CS5460ADin=0;
}
CS5460APulseClock();
WriteLong=WriteLong<<1;
}
return;
}
//================================================== =========================
long CS5460ARead24Bits(char AdcRegisterAddress)
{
char BitCounter=0;
//send read command with register address
long WriteByte;
long Data24Bits;
long ThreeSync0;
WriteByte=CS5460A_READ & AdcRegisterAddress;
Data24Bits=0;
ThreeSync0=0x00FEFEFE;
CS5460ADout=1;//pull up port pin for a read
for(BitCounter=0;BitCounter<8;BitCounter++)
{
if(WriteByte & 0x80)
{
CS5460ADin=1;
}
else
{
CS5460ADin=0;
}
CS5460APulseClock();
WriteByte=WriteByte<<1;
}
for(BitCounter=0;BitCounter<24;BitCounter++)//read 24 bits
{
if(ThreeSync0 & 0x00800000)
{
CS5460ADin=1;
}
else
{
CS5460ADin=0;
}//SYNC0 command on SDI
CS5460APulseClock();
ThreeSync0=ThreeSync0<<1;
if(CS5460ADout)
{
Data24Bits=((Data24Bits<<1)| 0x1);
}//get msb and other bits
else
{
Data24Bits=Data24Bits<<1;
}
}
return(Data24Bits>>1 & 0x00FFFFFF);
}
//================================================== =========================
void CS5460APulseClock(void)
{
CS5460AClk=1;
CS5460AClk=0;
}
//================================================== =========================
 void Delay_ms(unsigned int itime)
{
 
unsigned int i,j;
for(i=0;i<itime;i++)
for(j=0;j<1257;j++) ;
}
void main(void)
{
//CS5460AResetMC=0;
//Delay_ms(140);//delay
//CS5460AResetMC=1;
//unsigned long tp=0x0022;
IE=0x82; // enable ext int 0
IT0=1;
TMOD= 0x02; // timer 0 
TH0=0x46; // for refresh led
TR0=1;
 
P0=0x00;
P2 = 0x00;
dig_num= 0;
COUNT = 0;
CS5460AClk=0;
CS5460AResetConfigure();
Delay_ms(10);
if(CS5460AReadCRDYBit())
{
Va=1;
}
Gain=CS5460ARead24Bits(CS5460A_REG_VOLT);//dummy read
//tp=0x1234;
//display_data(1234);
Delay_ms(140); 
while(1)
{
if(CS5460AReadCRDYBit())
{
//CS5460AWrite24Bits(STATUS_CLR_DRDY,CS5460A_REG_STATUS);//clear DRDY
Test=CS5460ARead24Bits(CS5460A_REG_CURRENT);
Volt=CS5460ARead24Bits(CS5460A_REG_VOLT);
energy = CS5460ARead24Bits(CS5460A_REG_POWER);
CS5460AWrite24Bits(STATUS_CLR_CRDY,CS5460A_REG_STATUS);//clear CRDY
}
buzzer=0;
display_data(1234);
Delay_ms(140);
display_data(Test);
Delay_ms(140);
display_data(Volt);
Delay_ms(140);
display_data(energy);
Delay_ms(140);
}//end of while
}//end of main

---

Sir pls send me ur SPI 16 bit ADC Program it will be helpful to me checking whether my SPi Initialization is right or wrong.

 

[dighedip@gmail.com]

Re: Help about interfaacing of ADC CS5460 with 89c51

Thank u very much for ur reply!
i think time delay is the very imp parameter for this ADC CS5460
Is there any alternative available as 24 bit ADC

- - - Updated - - -

Thank u very much for ur reply!
i think time delay is the very imp parameter for this ADC CS5460
Is there any alternative available as 24 bit ADC

 

[jayanth.devarayanadurga]

http://www.linear.com/product/LTC2400

http://www.linear.com/product/LTC2485

http://cds.linear.com/docs/en/datasheet/2440fd.pdf

 

[dighedip@gmail.com]

let me read datasheets of above ADC's
Sir now what about CS5460? ,
what is the problem in that?

Pls send me ur SPI 16 bit ADC Code
Thanks in advance!

 

[jayanth.devarayanadurga]

You want this Project?

Maybe you have to make CS high or low. See the datasheet. Without 0 or 1 on CS pin the device will not be work.

 

[dighedip@gmail.com]

Yes Sir i want this project, Send me the details of above project also pls send me the program for it, and after study pls help me to implement it.
pls is there any problem in my code?
In my board, CS Pin is kept low for normal operation and continuous reading.
do you have *.lib file of CS5460 ADC for Proteus simulation?
or pls send me the link where i will get all lib files.

 

[dighedip@gmail.com]

Pls I need library file of ADC CS5460 can any one send me the information regarding the library files...