TM7705 Chinese information, TM7705 introduction:
The TM7705 is a 2/3 channel analog front end for low frequency measurements. The device accepts low-level input signals directly from the sensor and then produces a serial digital output. 16-bit lossless code performance is achieved using sigma-delta conversion techniques. The selected input signal is sent to a gain programmable programmable front end based on an analog modulator. An on-chip digital filter processes the output signal of the modulator. The first notch of the digital filter is programmed by the on-chip control register, which adjusts the filter's cutoff point and output update rate.
The TM7705 requires only a single 2.7~3.3V or 4.75~5.25V supply. The TM7705 is a dual channel fully differential analog input with a differential reference input. When the supply voltage is 5V and the reference voltage is 2.5V, the device can process signals with input signals ranging from 0~+20mV to 0~+2.5V. It can also handle bipolar input signals from ±20mV to ±2.5V. The TM7705 is referenced to the AIN(-) input. When the power supply voltage is 3V and the reference voltage is 1.225V, it can handle 0~+10mV to 0~+1.225V unipolar input signals. Its bipolar input signal range is ±10mV to ±1.225V. Therefore, the TM7705 can perform conditioning and conversion of all signals in a 2/3 channel system.
The TM7705 is ideal for intelligent systems, microcontroller systems and DSP-based systems. Its serial interface can be configured as a three-wire interface. The choice of gain value, signal polarity, and update rate can be configured by software using the serial input. The device also includes self-calibration and system calibration options to eliminate gain and offset errors in the device itself or the system.
The CMOS structure ensures very low power consumption and the power-down mode reduces standby power consumption to 20μW (typ). The TM7705 is available in 16-pin plastic dual in-line (DIP) and 16-pin wide (0.3-inch) SOIC, 16-pin TSSOP, 16-pin SOP and 16-pin SSOP packages.
TM7705 package drawing:
TM7705 product features:
• 2 fully differential input channel ADCs
• 16-bit no missing code
• 0.003% nonlinear
• Programmable gain front end
• Gain: 1~128
• Three-wire serial interface
• Ability to buffer analog inputs
• 2.7 ~ 3.3V or 4.75 ~ 5.25V working voltage
• Maximum power consumption is 1mW at 3V
• The maximum waiting current is 8μA
• 16-pin DIP, SOIC (wide body) and TSSOP, SOP, SSOP packages
TM7705 IC Data Register Reader:
/* Driver IC: TM7705 MCU: STC12C5620AD Crystal 11.0592MHz Function: Read and write IC register program, for reference only*/
#include "reg51.h"
#include "intrins.h"
Sbit SCLK = P2^7;
Sbit DIN = P2^6; / / corresponding to the DIN of the TM7705
Sbit DOUT = P2^5;//corresponds to DOUT of TM7705
Sbit DRDY = P2^4;
Void TM7705_write(unsigned char dd)
{
Unsigned char i;
SCLK=1;
For(i=8;i>0;i--)
{
SCLK=0;
_nop_();
If(dd&0x80)
DIN=1;
Else
DIN=0;
_nop_();
SCLK=1;
_nop_();
Dd<<=1;
}
DIN=1;
SCLK=1;
}
Unsigned char TM7705_read(void)
{
Unsigned char dd=0,i;
SCLK=1;
For(i=0;i<8;i++)
{
SCLK=0;
_nop_();
Dd=dd<<1;
If(DOUT)
Dd=dd+1;
SCLK=1;
_nop_();
}
SCLK=1;
Return dd;
}
Void main()
{
Unsigned char i,temp1,temp2;
Unsigned char gain,freq;
Unsigned char num;
DRDY=1;//Set DRDY as input
DOUT=1; / / set DOUT as input
//TM7705 initialization
DIN=1;
For(i=0;i<40;i++)// DIN port high level for at least 32 clocks after chip reset
{
SCLK=0;
_nop_();
SCLK=1;
_nop_();
}
/ / Set TM7705
TM7705_write(0x22);//write communication register, select next write clock register
TM7705_write(0x04|freq);//Select output update rate is 50 (0x00), 60 (0x01), 250 (0x02), 50
TM7705_write(0x12);//write communication register, select next write register
TM7705_write(0x42|(gain<<3)); //bipolar, self-calibration//gain 1 (0x00), 2 (0x08), 4 (0x10), 8 (0x18), 16 (0x20),
/ * Count value of 500, until the data is stable * /
Num=0xff;
While(num--) {
While(DRDY);
TM7705_write(0x3A); //Write the communication register, select the next read channel 0
Temp1 = TM7705_read();//Read data 16 bits
Temp2 = TM7705_read();
While(!DRDY);
}
/*Read data*/
Num=0;
While(1)
{
While(DRDY);
TM7705_write(0x3A); //Write the communication register, select the next read channel 0
Temp1 = TM7705_read();//Read data 16 bits
Temp2 = TM7705_read(); //add you code
While(!DRDY);
}
}
TM7705 read and write IC memory circuit diagram:
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