MLX90316KDC-BDG Datasheet, PDF (32/45 Pages) Melexis Microelectronic Systems – Rotary Position Sensor IC

MLX90316
Rotary Position Sensor IC
16.9. Slave Reset
On internal soft failures the Slave resets after 1 second or after an (error) frame is sent. On internal hard
failures the Slave resets itself. In that case, the Serial Protocol will not come up. The serial protocol link is
enabled only after the completion of the first synchronization (the Master deactivates /SS for at least t5).
16.10. Frame Layer
16.10.1. Command Device Mechanism
Before each transmission of a data frame, the Master should send a byte AAh to enable a frame transfer.
The latch point for the angle measurement is at the last clock before the first data frame byte.
Latch point
/SS
SCLK
MOSI
MISO
AF F F F F F F F F
AF F F F F F F F F
F
F
F
F
D
A
T
A
F
F
F
F
F
F
F
F
Timing diagram
AF F
AF F
F
F
F
F
D
16.10.2. Data Frame Structure
A data frame consists of 10 bytes:
• 2 start bytes (AAh followed by FFh)
• 2 data bytes (DATA16 – most significant byte first)
• 2 inverted data bytes (/DATA16 - most significant byte first)
• 4 all-Hi bytes
The Master should send AAh (55h in case of inverting transistor) followed by 9 bytes FFh. The Slave will
answer with two bytes FFh followed by 4 data bytes and 4 bytes FFh.
16.10.3. Timing
There are no timing limits for frames: a frame transmission could be initiated at any time. There is no inter-
frame time defined.
3901090316
Rev10
Page 32 of 45
Jul/13