Hi. What is the smallest MPS Angular Encoder device?
Hi Hongxin,
welcome at the MPS Forum!
The MA782 is the smallest MPS MagAlpha sensor and it is the world’s smallest absolute ICEncoder®.
It´s size is 2mm x 2mm x 0.6mm QFN-14, what makes it perfect for wearable and IoT devices
The sensor is targeting Ultra Low Power applications: HMI but also motorized and combined applications.
Does the size have an impact on the performance?
No, the SpinAxis™ structure has the same performance as all others.
The filter function is even extended for a very wide cut off frequency range (5Hz … 16kHz).
This part focuses on Ultra Low Power Applications:
fast response for the benefit of a short powered time and a much longer standby time. This duty cycle reduces the total current consumption dramatically down into x µA ranges.
MA782 supports an 8 bit to 12 bit resolution range, configurable with the filter window.
Why is there no ABZ or UVW output interface available?
In Ultra Low Power Operation the sensor sleeps and wakes up by timing or external event. This wake-and-Sleep does not serve Real-Time-Interfaces like ABZ, UVW, PWM and SSI. Such interfaces do need a continuous update to provide data.
The MA782 focuses on the embedded SPI interface and waking up + notification inputs and outputs.
Also the 14 pins and the VDDIO reduce the available pins for interfacing.
For ABZ and UVW the MA3xx family provides such signals:
e.g. the most flexibel device with the highest resolution 8 bit … 14 bit): MA330
What is the highest possible spinning speed for MA782?
Hi Gregory,
The max spinning speed for the MA782 is determined by the amount of acceptable angle error combined with the desired filter window.
For example, if we assume you can accept 1 degree of error, the max allowable latency must fit within the 1 degree allowable error window. Latency is = 3us + Tau. Tau is determined by your filter window ,see below or Table 18 in your datasheet.
We have a new part available on our web site, the MA735. This part has ABZ and does not have the speed limitations of the MA782. The MA735 includes lag compensation.
MA782 filter window table:
