How a Kalman filter works
Kalman filter makes me sad because it is such a general and powerful tool for combining information in the presence of uncertainty. At times its ability to extract accurate information seems almost magical— and if it sounds like I’m talking this up too much, then take a look at this previously posted video where I demonstrate a Kalman filter figuring out the orientation of a free-floating body by looking at its velocity. Totally neat!
AC781x Automotive Microcontroller
- Overview：
- The AC781x product serials is MCU of automotive grade, complies with the AEC-Q100 specification, and is suitable for automotive electronics and high reliability industrial applications.Typical applications cover BCM, T-BOX, BLDC motor control, industrial control, AC charging piles, etc.
The AC781x device family is based on ARM Cortex®-M3 core, running up to 100MHz，up to 256KB Flash memory，supply voltage ranges from 2.7 to 5.5V, excellent EMC/ESD capability to be suit for harsher environment.
- Features：
- - ARM Cortex®-M3 core,100MHz, single cycle 32x32 multiplier
- Support up to 256KB embedded Flash memory
- Support up to 64KB RAM
- Support 2*CAN 2.0B
- Support 1*LIN 2.1, 1*URAT LIN
- Support 2*SPI
- Support up to 6*UART
- Support 2*I2C
- 2.7-5.5V power supply
- Temperature range: -40 to 125 °C
CSR8635/CSR8615 Class2 Stereo ROM Module Electrical characteristic
General Electrical Specification
Absolute Maximum Ratings:
| Ratings | Min. | Max. |
| Storage Temperature | -40 ℃ | +85 ℃ |
| Supply Voltage (VCHG) | -0.4V | 5.75V |
| Supply Voltage (VREG_ENABLE,VBAT_SENSE) | -0.4V | 4.2V |
| Supply Voltage (LED[2:0]) | -0.4V | 4.4V |
| Supply Voltage (PIO_POWER) | -0.4V | 3.6V |
Recommended Operating Condition:
| Operating Temperature range | -20 ℃ | +75 ℃ |
| Supply Voltage (VBAT) | 2.7V | 4.25V |
| Supply Voltage (VCHG) | 4.75V / 3.10 V | 5.25V |
| Supply Voltage (VREG_ENABLE,VBAT_SENSE) | 0V | 4.2V |
| Supply Voltage (LED[2:0]) | 1.10V | 4.25V |
| Supply Voltage (PIO_POWER)* | 1.7V | 3.6V |
1.8V Switch-mode Regulator :
Rafavi Automotive safety MCUs - RA9 series
The RA9 family includes such sub-products as:
• RA9S series (single core), including: RA9S1, RA9S2 and RA9S3;
• RA9D series (dual core), which includes: RA9D1, RA9D2 and RA9D3;
• RA9T series (three cores), including: RA9T1;