AS5045-ASST datasheet(16/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

AS5045 − Detailed Description

If CSn changes to logic low, Data Out (DO) will change from high

impedance (tri-state) to logic high and the read-out will be

initiated.

• After a minimum time tCLK FE, data is latched into the

output shift register with the first falling edge of CLK.

• Each subsequent rising CLK edge shifts out one bit of data.

• The serial word contains 18 bits, the first 12 bits are the

angular information D[11:0], the subsequent 6 bits

contain system information, about the validity of data

such as OCF, COF, LIN, Parity and Magnetic Field status

(increase/decrease).

• A subsequent measurement is initiated by a “high” pulse

at CSn with a minimum duration of tCSn.

Data Content

D11:D0 – absolute angular position data (MSB is clocked out

first)

OCF – (Offset Compensation Finished), logic high indicates the

finished Offset Compensation Algorithm

COF – (CORDIC Overflow), logic high indicates an out of range

error in the CORDIC part. When this bit is set, the data at D9:D0

is invalid. The absolute output maintains the last valid angular

value. This alarm may be resolved by bringing the magnet

within the X-Y-Z tolerance limits.

LIN – (Linearity Alarm), logic high indicates that the input field

generates a critical output linearity. When this bit is set, the data

at D9:D0 may still be used, but can contain invalid data. This

warning may be resolved by bringing the magnet within the

X-Y-Z tolerance limits.

Even Parity – Bit for transmission error detection of bits 1 …17

(D11 …D0, OCF, COF, LIN, MagINC, MagDEC). Placing the

magnet above the chip, angular values increase in clockwise

direction by default.

Data D11:D0 is valid, when the status bits have the following

configurations.

Figure 14:

Status Bit Outputs

Note(s):

1. MagInc=MagDec=1 is only recommended in YELLOW mode (see Figure 16).

OCF

COF

LIN

MagINC

MagDEC

Parity

Even checksum of bits

1:15

1(1)

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