AS5043 datasheet(4/26 Pages) AMSCO

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AS5043 Programmable 360° Magnetic Angle Encoder

Revision 1.4, 04-Apr-06

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7 3.3V / 5V Operation

The AS5043 operates either at 3.3V ±10% or at 5V

±10%. This is made possible by an internal 3.3V Low-

Dropout (LDO) Voltage regulator. The core supply

voltage is always taken from the LDO output, as the

internal blocks are always operating at 3.3V.

For 3.3V operation, the LDO must be bypassed by

connecting VDD3V3 with VDD5V (see Figure 4 ).

For 5V operation, the 5V supply is connected to pin

VDD5V, while VDD3V3 (LDO output) must be buffered by

a 1...10µF capacitor, which should be placed close to the

supply pin (see).

The VDD3V3 output is intended for internal use only It

should not be loaded with an external load.

The voltage levels of the digital interface I/O’s

correspond to the voltage at pin VDD5V, as the I/O

buffers are supplied from this pin (see Figure 4).

Figure 4: Connections for 5V / 3.3V supply voltages

A buffer capacitor of 100nF is recommended in both

cases close to pin VDD5V.

8 10-bit Absolute Synchronous

Serial Interface (SSI)

The serial data transmission timing is outlined in Figure

5: if CSn changes to logic low, Data Out (DO) will change

from high impedance (tri-state) to logic high and the

read-out sequence 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 16 bits, the first 10 bits are the

angular information D[9:0], the subsequent 6 bits contain

system information, about the validity of data such as

OCF, COF, LIN, Parity and Magnetic Field status

(increase / decrease / out of range) .

A subsequent measurement is initiated by a logic “high”

pulse at CSn with a minimum duration of tCSn.

Data transmission may be terminated at any time by

pulling CSn = high.

8.1

Serial Data Contents:

D9:D0 absolute angular position data (MSB is clocked

out first).

OCF (Offset Compensation Finished), logic high

indicates that the Offset Compensation Algorithm has

finished and data is valid.

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 may contain invalid data. This warning may be

resolved by bringing the magnet within the X-Y-Z

tolerance limits.

Data D9:D0 is valid, when the status bits have the

following configurations:

OCF

COF

LIN

Mag

INC

Mag

DEC

Parity

even

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of bits 1:15

Table 2: Status bit outputs

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