1.Multi-dimensional TMR3111D encoder chip architecture
TMR3111(TMR3111D)is a non-contact magnetic encoder chip developed by Multidimensional Technology,which works based on tunnel magnetoresistance effect.Compared with Hall element and AMR element,TMR has higher magnetoresistance change rate,and can still maintain stable angular resolution under weak magnetic field and large installation air gap.TMR sensor bridge and 23-bit resolution signal processing ASIC are integrated in the chip,which supports 0~360 absolute position detection and can adapt to both on-axis and off-axis magnetic circuit layouts.
The power supply voltage of the encoder chip is 3~5V,and the typical working current is 10mA；.The angular output delay is less than 2μs,the absolute accuracy is better than 0.05,and the maximum speed is 40000RPM；.Built-in EEPROM erases and writes more than 1000 times,and integrates fast self-calibration function,which meets the requirements of RoHS and REACH.
2.TMR3111D encoder chip output interface and programmable ability
SPI:Support 3-wire or 4-wire mode,and adopt SPI mode 1(CPOL=0,CPHA=1).After the CS pin is set low,the communication is enabled.The host writes the configuration through MOSI on the falling edge of SCLK,and the encoder chip reads back the 23-bit absolute angle data through MISO on the rising edge.
PWM:12-bit resolution,the duty ratio is proportional to the magnetic field angle,and the output frequency is configured in four grades as required.
ABZ:the maximum incremental output is 4096 lines,the A/B phase is programmable,and the Z pulse width and initial phase are also programmable.
3.The feasibility of multi-dimensional TMR3111D encoder chip replacing AMS AS5045
AS5045 is a widely used 12-bit absolute angle magnetic encoder,which is mostly used in commutation and position feedback of medium and low speed motors,and its output is mainly SSI.When the system requires higher resolution,response delay or speed margin,the encoder chip TMR3111D can be used as an upgrade path:the angular resolution is increased from 12 bits to 23 bits,the interface is expanded from a single serial absolute output to SPI,PWM and ABZ in parallel,and the ABZ incremental mode can also directly connect the encoder input channels of traditional servo and stepping drivers.
Keywords:encoder chip
next text :Parallel asynchronous MRAM memory S3R4016V1M can replace MR2A16A
Shenzhen Ramsun Microelectronics Co.,Ltd（Ramsun International） is a vendor of the seimicondutor componets and the memory IC’s solution with clear market advantage. We still focus on the promotion for some famous semicondutor brand ,and specially take the RAM(Random Access Memory) as our core products.
We are the authorized agent as designated by NETSOL、JSC、EVERSPIN、VTI、IPSiLog and Sinochip.And Lyontek.so on.
