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AS5171 − Register Description

UART Interface

The AS5171 is equipped with a UART interface, which allows

reading and writing the registers as well as permanently

programming the non-volatile memory (OTP). By default

(factory setting, customer_ lock = 0) the AS5171 is in the

so-called Communication Mode and the UART is connected at

the output pin (OUT ). In this mode, the device is in open-drain

mode and therefore a pull-up resistor has to be connected on

the output.

The UART interface allows reading and writing two consecutive

addresses. The standard UART sequence consists of four frames.

Each frame begins with a start bit (START), which is followed by

8 data bits (D[0:7]), one parity bit (PAR), and a stop bit (STOP),

as shown in Figure 17.

Figure 17:

UART Frame

The PAR bit is even parity calculated over the data bits (D[0:7]).

Each frame is transferred from LSB to MSB.

The four frames are shown in Figure 18.

Figure 18:

UART Frame Sequence

The first frame is the synchronization frame and consists of

D[0:7] = 0x55 followed by the parity bit (PAR=0) and the stop

bit. This frame synchronizes the baud rate between the AS5171

and the host microcontroller.

Frame Number

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

0x55

R/W

ADDRESS

DATA1

DATA2

START

D[0]D[1]D[2]

D[3]

D[4]D[5]D[6]

D[7]

PAR

STOP

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