AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

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Page 17 of 33

Switching the MODE pin affects the following parameters:

Parameter

Slow Mode

(Pin MODE = 0 or

open)

Fast Mode

(Pin MODE = 1)

sampling rate

2.61 kHz

(383µs)

10.42 kHz

(95.9µs)

transition noise

(1 sigma)

≤ 0.03° rms

≤ 0.06° rms

propagation

delay

384µs

96µs

Startup time

20ms

80ms

Table 8: Mode pin settings

Pin MODE should be fixed at power-up. A mode change during operation is not recommended.

Parallel Mode

The Parallel Mode allows connection of up to 8

AS5046’s in parallel on the SCL and SDA line,

maintaining just two wires for data transmission.

This mode is accomplished by connecting all the

SDA and SCL inputs/outputs in parallel. Each

AS5046 device can be programmed one address

ranging from 0…7 (see Table 2)

Figure 10: Parallel connection of up to 8 devices

Note that the parallel connection has some restrictions:

•

Each unit must be programmed to have a different address (ranging from 000 to 111; see Table 2)

•

Changing the address also changes the analog mode, as these OTP bits share the same position.(see Figure 13)

•

Only the SIU containing angle data and status bits can be read from parallel devices (type ID 0101). The other

registers all share the same type identifier (0001, 1011, 0111; see Table 2), which would lead to data collision

when trying to read any of these registers from parallel devices.

11 Ratiometric Analog Angle Output

the supply voltage VDD5V (max.5.5V). It can source or sink currents up to

±1mA in normal operation (up to 66mA short

circuit current).

The analog output block consists of a digital angular range selector, a 10-bit Digital-to-Analog converter and an OPAMP

buffer stage (see Figure 17).

The digital range selector allows a preselection of the angular range for 360°, 180°, 90° or 45° (see Table 9). Fine-tuning of

the angular range can be accomplished by adjusting the gain of the OPAMP buffer stage.

The reference voltage for the Digital-to-Analog converter (DAC) can be taken internally from VDD5V / 2. In this mode, the

output voltage is ratiometric to the supply voltage.

Alternatively, an external DAC reference can be applied at pin DACref (#9). In this mode, the analog output is ratiometric to

the external reference voltage.

µC

AS5046

Addr. 000

CSn

SDA

SCL

SCL

SDA

AS5046

Addr. 001

CSn

SDA

SCL

AS5046

Addr. 111

CSn

SDA

SCL