AS5170 datasheet(17/47 Pages) AMSCO

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[v1-01] 2016-Apr-11

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AS5170 − Register Description

UART Interface

The AS5170 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) the AS5170 is in the so-called Communication

Mode and the UART is connected at the output pin (OUT). In this

mode, it is possible to configure the register settings. 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 19.

Figure 19:

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 20.

Figure 20:

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 AS5170

and the host microcontroller.

The second frame contains the read/write command (D[7] = 0

Write, D[7] = 1 Read) and the address of the register (D[6:0] =

ADDRESS).

The content of the third and fourth frames (DATA1 and DATA2)

will be written to or read from the location specified by

ADDRESS and ADDRESS+1, respectively.

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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