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AS5134

Datasheet - Detailed Descr i pti on

7.11 Serial Synchronous Interface (SSI)

Normal mode is used for normal operations, whereas extended mode is for accessing the OTP.

SM_RES: State machine reset of the digital part of the device (soft reset).

EN PROG: Enables the access to the OTP register in Extended Mode.

WRITE CONFIG: LP HI activates the sleep mode of the AS5134. The power consumption is significantly reduced. LP LO returns to normal

operation mode. During sleep mode, the lock_adc bit in command 0 is LO.

RD_MT Counter: Command for read out of multi turn register.

OTP_OK: Bit shows correct readout of the OTP register after startup. The bit is valid till the next OTP access.

RD_ANGLE: Command for read out of angle value and AGC value (agc). “Lock” indicates a locked ADC.

tst: Test bits for internal testing (must be left unchanged).

Hyst (11:10): Digital Hysteresis can be set via the digital interface 0, 1, 2 (default), 3 LSB

The hysteresis can be changed over the interface. An activation of the SM_RES bit is required. This can be performed in two steps -

1. Use WRITE CONFIG 1 command and write the selected hysteresis and SM_RES = ‘1’ into the device.

2. Use again WRITE CONFIG 1 command and release SM_RES = ‘0’ with the same hysteresis setting.

SET MT COUNTER: Command for setting the Multi Turn Counter to a defined value.

LP: Default "0"; "1" for using the low power function.

lock_adc: Indicates that the tracking adc is in a locked status. For a valid angle (the magnetic field has to be in a certain range, which is

indicated by the agc value) or a missing magnet the lock_adc is set.

Table 9. Commands of the SSI in Normal Mode

Digital interface at normal mode

#

cmd

bin

mode

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

23

WRITE

CONFIG 1

10111

write

LP

SM_

RES

tst

tst Hyst <1:0> tst

tst

tst

20

SET MT

COUNTER

10100

write

multi-turn-counter <8:0>

16

EN PROG

10000

write

1

0

0

01

10

01

01

01

11

0

4

RD MT

COUNTER

00100

read

multi-turn-counter <8:0>

OTP

_OK

0

RD_ANGLE

00000

read

lock_

adc

agc <5:0>

angle <8:0>

Hyst

Function

0

0

2 LSB (default value)

01

1

10

3

11

0